Holtsville, NY

12:16 PM EDT on May 21, 2013 (GMT -0400)
Elev: 105 ft
Lon: 73.0° W
Lat: 40.8° N
Source
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Global: Violent Tornado Causes Catastrophic Damage in Moore, Oklahoma
Active Advisory: Dense Fog Advisory (US Severe Weather) Active Notice: Public Information Statement
News
Why Don't More Homes in Oklahoma Have Basements?
May 21, 2013
The answer lies in the level of the water table and the soil texture in Oklahoma and in states across the Plains.
Photos: Deadly Tornado Outbreak Strikes Plains
May 21, 2013
A tornado outbreak struck the Plains states on May 19, 2013, leaving widespread damage in its wake.
Pres. Obama Says Focus Is On 'Urgent Work of Rescue'
May 21, 2013
The search and rescue efforts are ongoing in Moore, Okla. after a massive tornado levelled the town and local schools.
Children and the Tornado: Helping Kids Cope
May 21, 2013
Any time children are involved in a catastrophe, emotional reactions among survivors and across the nation are particularly strong.
Recap: Tornadoes Rake Oklahoma, Kansas, Iowa
May 21, 2013
The weather imagery, video and recap from tornadoes in the Plains on May 19, 2013.
Tornado Took Similar Path to 1999 F5
May 21, 2013
Moore, Oklahoma is no stranger to devastating tornadoes.
'I Expected Chaos:' Scenes from Okla. School
May 21, 2013
A photographer who was among the first to arrive at an Oklahoma Elementary School after a tornado destroyed it, describes the heart-wrenching scene.
Obama: 'Americans From Every Corner of This Country Will Be With Them'
May 21, 2013
Obama has declared a major disaster in Oklahoma, ordering federal aid to supplement state and local recovery efforts. The president also spoke Monday with Oklahoma Gov. Mary Fallin and Rep. Tom Cole, whose home is in the heavily damaged town of Moore.
A Timeline of Deadly Events in Moore, Okla.
May 21, 2013
Check out this comprehensive timeline of the events that transpired in Moore, Okla.
In Tornado's Wake, Worried Parents Seek Out Kids
May 21, 2013
A desperate search was underway by parents looking to find children after the massive tornado.
Massive Tornado Damages Small Okla. City Hospital
May 21, 2013
Officials say a tornado hit a small hospital in suburban Oklahoma City, but all the 30 patients inside survived.
Moore Already at Work on Recovery, Says Mayor
May 21, 2013
Glenn Lewis was the mayor of Moore, Okla., when the strongest tornado on record whipped the city in 1999, and he says the most recent storm won't deter the community from rebuilding.
Moore Survivor Finds Dog Buried Alive
May 21, 2013
Watch as a tornado survivor is interrupted in the middle of interview by a little dog digging out of rubble.
Oklahoma Tornado: How to Help
May 21, 2013
There are several agencies asking for donations to help those hit hard by the Oklahoma tornadoes.
Multiple Children Dead at Okla. School
May 21, 2013
More than a dozen children are dead in the devastating Moore, Okla. tornado.
Twitter Responds With Prayers for Oklahoma Tornado Victims
May 21, 2013
Twitter responds to the devastation brought by tornadoes Monday in suburban Oklahoma City, offering condolences and prayers for the victims and survivors.
In Their Words: The Oklahoma Tornado Tragedy
May 21, 2013
Our reporters were among the first national media to report from Moore, Okla. shortly after a powerful tornado decimated the town. These are their thoughts as they report from the scene.
Obama Declares Major Disaster in Oklahoma
May 21, 2013
President Barack Obama has declared a major disaster in Oklahoma as the state recovers from a massive tornado that ripped through the Oklahoma City suburbs Monday, killing dozens and flattening entire neighborhoods.
Photos, Social Media Capture Terror of Okla. Tornadoes
May 20, 2013
Catastrophic tornadoes developed in Oklahoma on Monday. Here are photos and social media reports.
Huge Rock Crashes Into Moon, Sparks Giant Explosion
May 20, 2013
The moon has a new hole on its surface thanks to a boulder that slammed into it in March, creating the biggest explosion scientists have seen on the moon since they started monitoring it.
More News Articles
Weather Summary
Kari Kiefer
Weather Underground Forecast for Tuesday, May 21, 2013.

After a devastating severe weather day in the Plains on Monday, severe weather is expected to fire up again across the nation's mid-section again on Tuesday.

The nearly stationary low over the Northern Plains will gradually weaken as it shifts eastward into the Midwest on Tuesday, while the system's associated cold front trails southwestward from the low across the Mid-Mississippi Valley through the Southern Plains. Favorable energy and conditions ahead of the cold front combined with the moisture laden conditions of the nation's mid-section will set the stage for multiple clusters of thunderstorms to develop from the Midwest into the Ozarks and the Southern Plains. Portions of northeastern Texas, extreme southeastern Oklahoma, central and southern Arkansas, and northwestern Louisiana are at moderate risk of severe thunderstorm activity as environmental conditions remain favorable for tornadoes, damaging wind gusts, and very large hail. Areas surrounding this moderate risk region from the parts of central and eastern Texas into the Upper Great Lakes are at slight risk of severe thunderstorm development with hail, damaging wind gusts, and isolated tornadoes.

Meanwhile, areas of heavy rain and widely scattered showers will continue near the low in the Northern Plains and Upper Mississippi Valley and near and to the north of a nearly stationary frontal boundary extending out ahead of the system from the Great Lakes into the Northeast. Continued precipitation in already saturated areas of the Northern Plains and Upper Midwest will maintain flood concerns from parts of North Dakota into northern Wisconsin.

Elsewhere, scattered showers and thunderstorms are expected to persist in the Mid-Atlantic and southeastern corner of the nation.
Weather Underground Forecast for Tuesday, May 21, 2013.

After a devastating severe weather day in the Plains on Monday, severe weather is expected to fire up again across the nation's mid-section again on Tuesday.

The nearly stationary low over the Northern Plains will gradually weaken as it shifts eastward into the Midwest on Tuesday, while the system's associated cold front trails southwestward from the low across the Mid-Mississippi Valley through the Southern Plains. Favorable energy and conditions ahead of the cold front combined with the moisture laden conditions of the nation's mid-section will set the stage for multiple clusters of thunderstorms to develop from the Midwest into the Ozarks and the Southern Plains. Portions of northeastern Texas, extreme southeastern Oklahoma, central and southern Arkansas, and northwestern Louisiana are at moderate risk of severe thunderstorm activity as environmental conditions remain favorable for tornadoes, damaging wind gusts, and very large hail. Areas surrounding this moderate risk region from the parts of central and eastern Texas into the Upper Great Lakes are at slight risk of severe thunderstorm development with hail, damaging wind gusts, and isolated tornadoes.

Meanwhile, areas of heavy rain and widely scattered showers will continue near the low in the Northern Plains and Upper Mississippi Valley and near and to the north of a nearly stationary frontal boundary extending out ahead of the system from the Great Lakes into the Northeast. Continued precipitation in already saturated areas of the Northern Plains and Upper Midwest will maintain flood concerns from parts of North Dakota into northern Wisconsin.

Elsewhere, scattered showers and thunderstorms are expected to persist in the Mid-Atlantic and southeastern corner of the nation.
More News Articles

Holtsville Weather at a Glance

Updated 12:00 PM EDT
Elevation
150 ft
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Now
Partly Cloudy
Partly Cloudy
Temperature
78.9 °F
Feels Like 82 °F
Wind(mph)
2.0
Sunrise / Set
5:29 AM
8:08 PM
Moon
Waxing Gibbous
Today
Thunderstorm 81 °F
Thunderstorm
20% chance of precipitation
Tonight
Chance of a Thunderstorm 63 °F
Chance of T-storms
30% chance of precipitation
Tomorrow
Chance of a Thunderstorm 81 | 64 °F
Chance of T-storms
30% chance of precipitation
Thursday
Chance of a Thunderstorm 75 | 59 °F
Chance of T-storms
60% chance of precipitation
Friday
Chance of a Thunderstorm 70 | 46 °F
Chance of T-storms
50% chance of precipitation
Saturday
Chance of Rain 70 | 50 °F
Chance of Rain
50% chance of precipitation
Today is forecast to be nearly the same temperature as yesterday.
Conditions
Pressure
29.92 in
Visibility
7.0 miles
Clouds
Few 1000 ft
Moisture
Humidity
78%
Rainfall
0.00 in
Snow Depth
Not available.
METAR
METAR KISP 211556Z 19009KT 7SM FEW010 24/18 A2992 RMK AO2 SLP132 T02390183
Don't speak METAR? Read our FAQ.
Weather Radio
Weather Radio Index
Temperature
Heat Index
82 °F
Dew Point
71 °F
Wind
Speed / Dir
2.0 mph from SSE
Wind Gust
3.0 mph
Health
UV
10 out of 16
Pollen
8.40 out of 12
Pollen Forecast
Ozone
Good
Flu Activity
Sporadic
View Flu Map
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Source: BestForecast
Descriptive Forecast
Tuesday
partlycloudy Partly cloudy with thunderstorms and rain showers in the afternoon. Fog early. High of 81F. Winds from the SSW at 5 to 15 mph. Chance of rain 20%.
Tuesday Night
nt_chancetstorms Partly cloudy with a chance of a thunderstorm and a chance of rain, then a chance of rain after midnight. Fog overnight. Low of 63F. Winds from the SSW at 5 to 10 mph. Chance of rain 30%.
Wednesday
chancetstorms Mostly cloudy with a chance of a thunderstorm and a chance of rain. High of 81F. Winds from the SSW at 10 to 15 mph. Chance of rain 30%.
Wednesday Night
nt_chancetstorms Overcast with a chance of a thunderstorm and a chance of rain. Low of 64F. Winds from the SSW at 10 to 15 mph. Chance of rain 30%.
Thursday
chancetstorms Overcast with a chance of a thunderstorm and a chance of rain. Fog early. High of 75F. Breezy. Winds from the SSW at 15 to 20 mph. Chance of rain 60%.
Thursday Night
nt_chancetstorms Overcast with a chance of a thunderstorm and a chance of rain, then a chance of rain after midnight. Low of 59F. Breezy. Winds from the SSW at 15 to 20 mph. Chance of rain 70% with rainfall amounts near 0.4 in. possible.
Friday
chancetstorms Overcast with a chance of a thunderstorm and rain. High of 70F. Winds from the SSW at 10 to 15 mph. Chance of rain 50%.
Friday Night
nt_chancerain Overcast with a chance of rain in the evening, then partly cloudy with a chance of rain. Fog overnight. Low of 46F. Breezy. Winds from the West at 10 to 20 mph shifting to the North after midnight. Chance of rain 40%.
Saturday
chancerain Clear with a chance of rain in the morning, then partly cloudy with a chance of rain. High of 70F. Breezy. Winds from the North at 20 to 25 mph. Chance of rain 50%.
Saturday Night
nt_partlycloudy Partly cloudy. Low of 50F. Breezy. Winds from the NNW at 10 to 20 mph.
Sunday
partlycloudy Partly cloudy. High of 70F. Breezy. Winds from the NW at 10 to 20 mph.
Sunday Night
nt_clear Clear. Low of 52F. Winds from the NW at 10 to 15 mph.
Monday
clear Clear. High of 70F. Winds from the West at 5 to 15 mph.
Monday Night
nt_clear Clear. Low of 50F. Winds from the SW at 5 to 15 mph shifting to the NW after midnight.
Tuesday
clear Clear. High of 72F. Winds from the WNW at 5 to 15 mph shifting to the SSW in the afternoon.
Tuesday Night
nt_partlycloudy Clear. Fog overnight. Low of 54F. Winds from the South at 5 to 15 mph.
Wednesday
partlycloudy Partly cloudy. High of 73F. Winds from the South at 5 to 10 mph.
Wednesday Night
nt_chancetstorms Partly cloudy with a chance of a thunderstorm. Fog overnight. Low of 55F. Winds from the SSW at 5 to 10 mph. Chance of rain 50%.
Thursday
partlycloudy Partly cloudy. High of 75F. Winds from the SSW at 5 to 10 mph.
Thursday Night
nt_partlycloudy Partly cloudy. Fog overnight. Low of 57F. Winds from the SSW at 5 to 10 mph.
Friday
chancetstorms Partly cloudy with a chance of a thunderstorm. High of 75F. Winds from the South at 5 to 10 mph. Chance of rain 40%.
Friday Night
nt_partlycloudy Clear with a chance of a thunderstorm. Fog overnight. Low of 57F. Winds less than 5 mph. Chance of rain 20%.
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Weather Forecast for Holtsville NY

View Calendar 10-Day Forecast for station KNYFARMI4

Tuesday, 21
Thunderstorm
81 | 63 °F
Thunderstorm
Chance of
Precipitation
20%
Wednesday, 22
Chance of a Thunderstorm
81 | 64 °F
Chance of T-storms
Chance of
Precipitation
30%
Thursday, 23
Chance of a Thunderstorm
75 | 59 °F
Chance of T-storms
Chance of
Precipitation
60%
Friday, 24
Chance of a Thunderstorm
70 | 46 °F
Chance of T-storms
Chance of
Precipitation
50%
Saturday, 25
Chance of Rain
70 | 50 °F
Chance of Rain
Chance of
Precipitation
50%
Sunday, 26
Partly Cloudy
70 | 52 °F
Partly Cloudy
Chance of
Precipitation
0%
Monday, 27
Clear
70 | 50 °F
Clear
Chance of
Precipitation
0%
Tuesday, 28
Clear
72 | 54 °F
Clear
Chance of
Precipitation
0%
Wednesday, 29
Partly Cloudy
73 | 55 °F
Partly Cloudy
Chance of
Precipitation
0%
Thursday, 30
Fog
75 | 57 °F
Fog
Chance of
Precipitation
0%
Source: BestForecast at 9:42 AM EDT on May 21, 2013
Descriptive Forecast
Tuesday
partlycloudy Partly cloudy with thunderstorms and rain showers in the afternoon. Fog early. High of 81F. Winds from the SSW at 5 to 15 mph. Chance of rain 20%.
Tuesday Night
nt_chancetstorms Partly cloudy with a chance of a thunderstorm and a chance of rain, then a chance of rain after midnight. Fog overnight. Low of 63F. Winds from the SSW at 5 to 10 mph. Chance of rain 30%.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 63 | 63 75 | 64 72 | 62 64 | 60
Wind 5 mph SW 10 mph SSW 12 mph SSW 8 mph SSW
Humidity 98% 71% 70% 86%
Chance of Precip. 0% 10% 20% 30%
Cloud Cover 70% 68% 63% 68%
Conditions Fog Fog Thunderstorm Chance of a Thunderstorm
Sunrise & Sunset
5:29 AM
8:08 PM
The quality of the forecasted high temperature for this day is good. MaxT RMSE [1.94], Average RMSE [1.59]
The National Weather Service forecast quality is fair. MaxT RMSE [2.90], Average RMSE [1.53] : Use NWS
Source: BestForecast at 9:42 AM EDT on May 21, 2013
Descriptive Forecast
Wednesday
chancetstorms Mostly cloudy with a chance of a thunderstorm and a chance of rain. High of 81F. Winds from the SSW at 10 to 15 mph. Chance of rain 30%.
Wednesday Night
nt_chancetstorms Overcast with a chance of a thunderstorm and a chance of rain. Low of 64F. Winds from the SSW at 10 to 15 mph. Chance of rain 30%.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 64 | 62 70 | 64 77 | 64 66 | 63
Wind 7 mph SSW 11 mph SW 12 mph SSW 11 mph SSW
Humidity 91% 84% 65% 88%
Chance of Precip. 30% 30% 30% 30%
Cloud Cover 75% 70% 76% 86%
Conditions Chance of Rain Chance of a Thunderstorm Chance of a Thunderstorm Chance of a Thunderstorm
Sunrise & Sunset
5:28 AM
8:09 PM
The quality of the forecasted high temperature for this day is fair. MaxT RMSE [2.62], Average RMSE [1.37]
The National Weather Service forecast quality is good. MaxT RMSE [2.36], Average RMSE [1.71] : Use NWS
Source: BestForecast at 9:42 AM EDT on May 21, 2013
Descriptive Forecast
Thursday
chancetstorms Overcast with a chance of a thunderstorm and a chance of rain. Fog early. High of 75F. Breezy. Winds from the SSW at 15 to 20 mph. Chance of rain 60%.
Thursday Night
nt_chancetstorms Overcast with a chance of a thunderstorm and a chance of rain, then a chance of rain after midnight. Low of 59F. Breezy. Winds from the SSW at 15 to 20 mph. Chance of rain 70% with rainfall amounts near 0.4 in. possible.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 66 | 62 68 | 63 63 | 63 63 | 59
Wind 13 mph SSW 15 mph SSW 15 mph South 17 mph SSW
Humidity 87% 83% 100% 88%
Chance of Precip. 30% 50% 60% 30%
Cloud Cover 91% 89% 85% 100%
Conditions Chance of a Thunderstorm Chance of a Thunderstorm Chance of a Thunderstorm Chance of Rain
Sunrise & Sunset
5:27 AM
8:10 PM
The quality of the forecasted high temperature for this day is fair. MaxT RMSE [2.79], Average RMSE [1.43]
The National Weather Service forecast quality is fair. MaxT RMSE [2.61], Average RMSE [2.90] : Use NWS
Source: BestForecast at 9:42 AM EDT on May 21, 2013
Descriptive Forecast
Friday
chancetstorms Overcast with a chance of a thunderstorm and rain. High of 70F. Winds from the SSW at 10 to 15 mph. Chance of rain 50%.
Friday Night
nt_chancerain Overcast with a chance of rain in the evening, then partly cloudy with a chance of rain. Fog overnight. Low of 46F. Breezy. Winds from the West at 10 to 20 mph shifting to the North after midnight. Chance of rain 40%.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 61 | 59 64 | 59 60 | 59 53 | 53
Wind 13 mph SSW 11 mph South 8 mph SSW 15 mph North
Humidity 92% 83% 94% 100%
Chance of Precip. 30% 20% 20% 20%
Cloud Cover 100% 100% 91% 98%
Conditions Chance of Rain Chance of a Thunderstorm Chance of a Thunderstorm Chance of Rain
Sunrise & Sunset
5:27 AM
8:11 PM
The quality of the forecasted high temperature for this day is fair. MaxT RMSE [2.63], Average RMSE [2.00]
The National Weather Service forecast quality is fair. MaxT RMSE [3.10], Average RMSE [2.65] : Use NWS
Source: BestForecast at 9:42 AM EDT on May 21, 2013
Descriptive Forecast
Saturday
chancerain Clear with a chance of rain in the morning, then partly cloudy with a chance of rain. High of 70F. Breezy. Winds from the North at 20 to 25 mph. Chance of rain 50%.
Saturday Night
nt_partlycloudy Partly cloudy. Low of 50F. Breezy. Winds from the NNW at 10 to 20 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 52 | 52 63 | 49 61 | 51 53 | 45
Wind 20 mph NNE 21 mph North 9 mph NNE 14 mph NW
Humidity 98% 61% 67% 75%
Chance of Precip. 20% 20% 30% 10%
Cloud Cover 0% 0% 38% 96%
Conditions Chance of Rain Chance of Rain Chance of Rain Overcast
Sunrise & Sunset
5:26 AM
8:12 PM
The quality of the forecasted high temperature for this day is fair. MaxT RMSE [2.91], Average RMSE [1.95]
The National Weather Service forecast quality is poor. MaxT RMSE [4.04], Average RMSE [2.41] : Use NWS
Source: BestForecast at 9:42 AM EDT on May 21, 2013
Descriptive Forecast
Sunday
partlycloudy Partly cloudy. High of 70F. Breezy. Winds from the NW at 10 to 20 mph.
Sunday Night
nt_clear Clear. Low of 52F. Winds from the NW at 10 to 15 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 53 | 41 65 | 42 62 | 44 54 | 42
Wind 17 mph NW 14 mph NW 12 mph NW 13 mph NW
Humidity 65% 42% 49% 63%
Chance of Precip. 0% 0% 0% 0%
Cloud Cover 0% 0% 84% 0%
Conditions Clear Clear Mostly Cloudy Clear
Sunrise & Sunset
5:25 AM
8:12 PM
The quality of the forecasted high temperature for this day is fair. MaxT RMSE [2.87], Average RMSE [2.00]
The National Weather Service forecast quality is fair. MaxT RMSE [3.33], Average RMSE [2.54] : Use NWS
Source: BestForecast at 9:42 AM EDT on May 21, 2013
Descriptive Forecast
Monday
clear Clear. High of 70F. Winds from the West at 5 to 15 mph.
Monday Night
nt_clear Clear. Low of 50F. Winds from the SW at 5 to 15 mph shifting to the NW after midnight.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 53 | 39 65 | 43 64 | 47 54 | 51
Wind 10 mph NNW 8 mph West 12 mph SW 9 mph WSW
Humidity 60% 44% 56% 85%
Chance of Precip. 0% 0% 0% 0%
Cloud Cover 0% 0% 0% 0%
Conditions Clear Clear Clear Clear
Sunrise & Sunset
5:25 AM
8:13 PM
The quality of the forecasted high temperature for this day is fair. MaxT RMSE [3.43], Average RMSE [2.14]
The National Weather Service forecast quality is fair. MaxT RMSE [3.23], Average RMSE [2.26] : Use NWS
Source: BestForecast at 9:42 AM EDT on May 21, 2013
Descriptive Forecast
Tuesday
clear Clear. High of 72F. Winds from the WNW at 5 to 15 mph shifting to the SSW in the afternoon.
Tuesday Night
nt_partlycloudy Clear. Fog overnight. Low of 54F. Winds from the South at 5 to 15 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 54 | 45 65 | 48 64 | 53 56 | 54
Wind 7 mph NW 5 mph WSW 13 mph SSW 4 mph SSE
Humidity 71% 53% 66% 92%
Chance of Precip. 0% 0% 0% 0%
Cloud Cover 0% 0% 0% 5%
Conditions Clear Clear Clear Clear
Sunrise & Sunset
5:24 AM
8:14 PM
The quality of the forecasted high temperature for this day is fair. MaxT RMSE [3.05], Average RMSE [2.84]
Source: BestForecast at 9:42 AM EDT on May 21, 2013
Descriptive Forecast
Wednesday
partlycloudy Partly cloudy. High of 73F. Winds from the South at 5 to 10 mph.
Wednesday Night
nt_chancetstorms Partly cloudy with a chance of a thunderstorm. Fog overnight. Low of 55F. Winds from the SSW at 5 to 10 mph. Chance of rain 50%.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 57 | 56 67 | 58 64 | 60 60 | 60
Wind 3 mph SSE 6 mph South 8 mph South 5 mph SSW
Humidity 96% 71% 87% 100%
Chance of Precip. 0% 0% 0% 10%
Cloud Cover 15% 29% 47% 62%
Conditions Fog Partly Cloudy Partly Cloudy Fog
Sunrise & Sunset
5:24 AM
8:15 PM
The quality of the forecasted high temperature for this day is poor. MaxT RMSE [3.64], Average RMSE [3.04]
Source: BestForecast at 9:42 AM EDT on May 21, 2013
Descriptive Forecast
Thursday
partlycloudy Partly cloudy. High of 75F. Winds from the SSW at 5 to 10 mph.
Thursday Night
nt_partlycloudy Partly cloudy. Fog overnight. Low of 57F. Winds from the SSW at 5 to 10 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 59 | 59 69 | 63 68 | 64 60 | 60
Wind 3 mph SW 6 mph SSW 8 mph South 6 mph SSW
Humidity 100% 82% 89% 100%
Chance of Precip. 10% 10% 0% 0%
Cloud Cover 74% 75% 65% 53%
Conditions Fog Mostly Cloudy Mostly Cloudy Fog
Sunrise & Sunset
5:23 AM
8:16 PM
Source: BestForecast at 9:42 AM EDT on May 21, 2013
Descriptive Forecast
Friday
chancetstorms Partly cloudy with a chance of a thunderstorm. High of 75F. Winds from the South at 5 to 10 mph. Chance of rain 40%.
Friday Night
nt_partlycloudy Clear with a chance of a thunderstorm. Fog overnight. Low of 57F. Winds less than 5 mph. Chance of rain 20%.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 61 | 60 71 | 63 69 | 64 62 | 62
Wind 4 mph SSW 7 mph South 8 mph South 3 mph South
Humidity 97% 74% 83% 100%
Chance of Precip. 0% 10% 10% 10%
Cloud Cover 38% 36% 48% %
Conditions Fog Partly Cloudy Partly Cloudy Fog
Sunrise & Sunset
Sun does not rise
Scientific Forecaster Discussion — MOS Weather Graph
Nearby
History & Almanac
May 21, 2013 Max Temp Min Temp
Normal (KISP) 69 °F 51 °F
Record (KISP) 90 °F (1996) 39 °F (2002)
Yesterday 75 °F 57 °F
Yesterday's Cooling Degree Days: 1
Choose a date
Earthquake Activity
City Distance Mag. Time & Date
No recent earthquake activity has been reported nearby.
Minimum magnitude displayed is 2.5.
More information at USGS.gov
Air Quality
  Air Quality AQ Index Pollutant
Yesterday Good
OZONE
Current Good
OZONE
Tuesday Moderate
OZONE
Tuesday Moderate
PM2.5
Wednesday Moderate
PM2.5
Coastal Water Temperatures
Place Temperature
No Stations Reporting
Marine Forecast
Astronomy
May. 21, 2013 Rise Set
Actual Time 5:29 AM EDT 8:08 PM EDT
Civil Twilight 4:57 AM EDT 8:40 PM EDT
Nautical Twilight 4:18 AM EDT 9:20 PM EDT
Astronomical Twilight 3:33 AM EDT 10:05 PM EDT
Moon 4:17 PM EDT 2:57 AM EDT
Length Of Visible Light 15h 42m
Length of Day
14h 39m
Tomorrow will be 1m 40s longer.
Waxing Gibbous, 84% of the Moon is Illuminated
Today
Waxing Gibbous
May 25
Full
May 31
Last Quarter
Jun 8
New
Jun 16
First Quarter
Visit Astronomy
Today's Extremes
State Highs State Lows
82 °F
Elmira
82 °F
Central Park
82 °F
New York
82 °F
Penn Yan
82 °F
Dansville
53 °F
Saranac Lake
55 °F
Plattsburgh
57 °F
Elmira
57 °F
Montauk
57 °F
Massena
Record Extremes
Snow Depth
Station Depth Elevation
No new snow has been reported.
Snow Depth Reports — Snow Depth Map
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Aviation
City Temp. Conditions Updated
Islip 75 °F Partly Cloudy 11:56 AM EDT
Shirley 71 °F Clear 11:56 AM EDT
Farmingdale 77 °F Clear 11:53 AM EDT
Westhampton Beach 70 °F Clear 11:53 AM EDT
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Flight To ETA Status
SWA3412
Tampa, FL 		KISP 12:23PM On Time
SWA114
West Palm Beach, FL 		KISP 01:39PM On Time
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Type Condition
Flight Rule: VFR (KISP)
Wind Speed: 9.0 kts.
Wind Dir: 163° (SSE)
Ceiling: Unlimited

METAR KISP 211556Z 19009KT 7SM FEW010 24/18 A2992 RMK AO2 SLP132 T02390183

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No events within 10 mi of location. View all events.
Event data courtesy eviesays.com
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Weather Stations
Station Location Temp. Heat Index Dew Point Humidity Wind Precipitation Elevation Updated Type Website
Farmingville, Farmingville, NY 78.9 °F 82 °F 71 °F 78% SSE  at  2.0 mph 0.00 in / hr 150 ft 12:00 PM EDT Normal  
APRSWXNET Farmingville NY , Farmingville, NY 79 °F 82 °F 71 °F 77% SSE  at  0 mph 0.00 in / hr 180 ft 11:30 AM EDT MADIS
Centereach, Centereach, NY 81.0 °F 85 °F 71 °F 72% SSW  at  1.0 mph 0.00 in / hr 128 ft 12:14 PM EDT Normal  
Natures Gardens, Selden, NY 80.9 °F 84 °F 69 °F 68% SW  at  0.0 mph 0.00 in / hr 95 ft 12:16 PM EDT Rapid Fire  
Eagle Estates, Medford, NY 78.4 °F 81 °F 69 °F 73% SSW  at  5.0 mph 0.00 in / hr 100 ft 12:13 PM EDT Normal  
Middle Country Library, Centereach, NY 83.7 °F 88 °F 71 °F 65% South  at  0.0 mph 0.00 in / hr 94 ft 12:16 PM EDT Rapid Fire
Strathmore Gate East, Coram, NY 88.0 °F 96 °F 73 °F 62% SE  at  5.4 mph 0.00 in / hr 86 ft 12:15 PM EDT Rapid Fire  
Port Ave, Ronkonkoma, NY 78.0 °F 80 °F 73 °F 83% SE  at  4.0 mph 0.00 in / hr 111 ft 12:15 PM EDT Rapid Fire
Lake Grove, NY, Lake Grove, NY 86.2 °F 89 °F 67 °F 53% SSW  at  11.5 mph 0.00 in / hr 0 ft 12:16 PM EDT Rapid Fire  
Sayville, NY 72.9 °F 72 °F 68 °F 86% SW  at  0.0 mph 0.00 in / hr 36 ft 12:16 PM EDT Rapid Fire  
Lake Hills Ronkonkoma, Ronkonkoma, NY 79.7 °F 86 °F 79 °F 98% South  at  1.6 mph - / hr 59 ft 12:04 PM EDT Normal  
Coram, NY 83.8 °F 81 °F 37 °F 19% SSW  at  0.0 mph 0.00 in / hr 72 ft 12:15 PM EDT Normal  
Long Island South Shore, Oakdale, NY 72.3 °F 74 °F 64 °F 76% North  at  0.0 mph 0.00 in / hr 30 ft 12:10 PM EDT Normal  
KNYSAINT3, Saint James, NY 85.8 °F 89 °F 68 °F 56% South  at  0.7 mph 0.00 in / hr 144 ft 12:16 PM EDT Rapid Fire  
Club 320, Saint James, NY 85.7 °F 90 °F 70 °F 59% WNW  at  0.0 mph 0.00 in / hr 171 ft 12:15 PM EDT Rapid Fire  
SeeMyIP.com Weather, St James, NY 86.0 °F 93 °F 73 °F 66% NW  at  2.2 mph 0.00 in / hr 148 ft 12:16 PM EDT Rapid Fire
RAWS LONG ISLAND NY, Patchogue, NY 73 °F 73 °F 66 °F 79% SW  at  3 mph 0.00 in / hr 24 ft 11:26 AM EDT MADIS
Creekside drive, Middle Island, NY 84.7 °F 89 °F 69 °F 60% South  at  2.7 mph - / hr 121 ft 12:15 PM EDT Normal  
East Setauket, NY 83.5 °F 89 °F 72 °F 69% West  at  1.0 mph 0.00 in / hr 86 ft 12:16 PM EDT Rapid Fire  
Mt. Sinai, NY 82.7 °F 87 °F 71 °F 67% SE  at  0.8 mph 0.00 in / hr 165 ft 12:16 PM EDT Rapid Fire
Canyon Creek, Port Jefferson, NY 86.4 °F 91 °F 70 °F 58% NW  at  6.3 mph 0.00 in / hr 233 ft 12:15 PM EDT Rapid Fire  
Islip, Islip, NY 69.5 °F - 67 °F 91% SSW  at  1.0 mph 0.00 in / hr 26 ft 12:16 PM EDT Rapid Fire  
Hauppauge LIE Exit 55, Hauppauge, NY 79.3 °F 82 °F 68 °F 69% South  at  6.0 mph 0.00 in / hr 140 ft 12:14 PM EDT Normal  
JJD Weather, Shirley, NY 70.2 °F 71 °F 63 °F 79% SW  at  5.0 mph 0.00 in / hr 23 ft 12:15 PM EDT Normal
Percy Williams EI, East Islip, NY 71.6 °F 76 °F 56 °F 57% SW  at  2.3 mph 0.00 in / hr 5 ft 12:16 PM EDT Rapid Fire  
Fire Island Pines, Fire Island Pines, NY 64.4 °F - 58 °F 81% SW  at  4.0 mph 0.00 in / hr 20 ft 12:12 PM EDT Normal
CIRRUS8 @ Shirley NY, Shirley, NY 71.5 °F 71 °F 66 °F 83% SSE  at  1.0 mph 0.00 in / hr 26 ft 12:16 PM EDT Rapid Fire  
APRSWXNET Miller Place NY , Miller Place, NY 85 °F 92 °F 73 °F 68% SW  at  0 mph 0.00 in / hr 131 ft 12:02 PM EDT MADIS
Rocky Point Station, Rocky Point, NY 83.9 °F 89 °F 71 °F 66% South  at  1.0 mph 0.00 in / hr 115 ft 12:14 PM EDT Normal  
Kings Park, NY 85.6 °F 91 °F 71 °F 61% SW  at  3.0 mph 0.00 in / hr 23 ft 12:12 PM EDT Normal  
Long Island's South Shore, Mastic Beach, NY 70.3 °F 76 °F 55 °F 58% North  at  0.0 mph 0.00 in / hr 24 ft 12:08 PM EDT Normal
Broadway, Rocky Point, NY 84.3 °F 90 °F 72 °F 66% NW  at  0.0 mph 0.00 in / hr 150 ft 12:16 PM EDT Rapid Fire  
Indian Head Knolls, Kings Park, NY 83.0 °F 88 °F 72 °F 69% SSW  at  5.4 mph 0.00 in / hr 157 ft 12:15 PM EDT Normal
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Dense Fog Advisory
Mobile & Email Alerts Statement as of 10:27 AM EDT on May 21, 2013

... Dense fog advisory in effect until 6 PM EDT this evening...

The National Weather Service in New York has issued a dense fog
advisory... which is in effect until 6 PM EDT this evening.

* Locations... mainly south of sunrise Highway across Nassau and
Suffolk counties.

* Hazards... dense fog.

* Visibilities... one quarter mile or less at times... locally near
zero.

* Timing... through this afternoon. The dense fog advisory may need
to be extended into tonight.

* Impacts... travel hazards due to poor and/or suddenly changing
visibilities.

Precautionary/preparedness actions...

A dense fog advisory means visibilities will frequently be
reduced to one quarter mile or less. If driving... slow down... use
your low beam headlights... and leave plenty of distance ahead of
you in case a sudden stop is needed.




Public Information Statement
Mobile & Email Alerts Statement as of 6:00 am EDT on May 21, 2013

... Safe boating week is may 18-24 2013...

The National Weather Service and the National safe boating Council
will partner for National safe boating week may 18-24. This week
will highlight relevant weather and safety specific public service
announcements for the recreational boating public.

Todays topic is understanding a marine weather forecast.

Understanding a marine forecast is critical to safe boating. Weather
ND wave conditions can change suddenly... catching boaters off guard
an creating life threatening conditions. Take particular note of any
current advisories and warnings... including small craft
advisories... gale or storm warnings... which alert mariners to either
high winds or waves occurring now or forecast to occur up to 24
hours from now. Before setting out... obtain the latest marine
forecast and warning information from www.Weather.Gov/marine or NOAA
Weather Radio. Several days ahead of time you can begin listening
for extended outlooks which give general information out to the next
five days in both graphical and text formats.

For more information on hazardous weather and boating safety... visit
the following websites...

Http://www.NWS.NOAA.Gov/safeboating

Http://www.Safeboatingcouncil.Org

Publication information statements are online at

Http://www.NWS.NOAA.Gov/om/notif.Htm


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