Herndon, VA

9:11 AM EDT on May 21, 2013 (GMT -0400)
Elev: 338 ft
Lon: 77.4° W
Lat: 38.9° N
Source
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News
Oklahoma Tornado: How to Help
May 21, 2013
There are several agencies asking for donations to help those hit hard by the Oklahoma tornadoes.
Recovery Efforts Continue in Deadly Okla. Tornado
May 21, 2013
The search and rescue efforts are ongoing in Moore, Okla. after a massive tornado levelled the town and local schools.
At Least 20 Children Dead at Okla. School
May 21, 2013
More than a dozen children perished 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.
'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.
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.
Tornado Took Similar Path to 1999 F5
May 21, 2013
Moore, Oklahoma is no stranger to devastating tornadoes.
Moore, Okla. Tornado Timeline
May 21, 2013
On May 20, 2013, a large deadly tornado ripped through the Oklahoma City area. Click to read the timeline of the tornado event
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.
Deadly Rainstorms Kill 55 in Southern China
May 20, 2013
Chinese authorities say rainstorms that battered southern China this week have killed 55 people and left 14 others missing.
Photos: Deadly Tornado Outbreak Strikes Plains
May 20, 2013
A tornado outbreak struck the Plains states on May 19, 2013, leaving widespread damage in its wake.
Recap: Tornadoes Rake Oklahoma, Kansas, Iowa
May 20, 2013
The weather imagery, video and recap from tornadoes in the Plains on May 19, 2013.
Amazing Nature, Captured
May 20, 2013
These stunning images of nature captured across the globe will change the way you view our world.
Photos: Tornado Devastation in Plains
May 20, 2013
Photos and social media reports of severe weather damage over the weekend in Oklahoma, Iowa and Kansas.
Tornado Hits South of Oklahoma City
May 20, 2013
Continuing coverage of destructive severe weather.
Tornado Hits OKC Suburb, Kicking Up Debris
May 19, 2013
A tornado kicked up debris in an Oklahoma City suburb and threatened a number of tourist attractions on historic Route 66 but there were no immediate reports of injuries or major damage.
Tornado Touches Down in Wichita
May 19, 2013
State emergency officials are monitoring a tornado in the Wichita area.
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

Herndon Weather at a Glance

Updated 9:11 AM EDT
Elevation
340 ft
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Now
Overcast
Overcast
Temperature
70.7 °F
Feels Like 70.7 °F
Wind(mph)
1.6
Sunrise / Set
5:52 AM
8:20 PM
Moon
Waxing Gibbous
Today
Chance of a Thunderstorm 88 °F
Chance of a Thunderstorm
20% chance of precipitation
Tonight
Chance of a Thunderstorm 68 °F
Chance of T-storms
30% chance of precipitation
Tomorrow
Chance of a Thunderstorm 86 | 68 °F
Chance of T-storms
30% chance of precipitation
Thursday
Chance of a Thunderstorm 82 | 55 °F
Chance of T-storms
50% chance of precipitation
Friday
Chance of Rain 72 | 52 °F
Chance of Rain
20% chance of precipitation
Saturday
Clear 72 | 45 °F
Clear
Today is forecast to be Warmer than yesterday.
Conditions
Pressure
30.01 in
Visibility
6.0 miles
Clouds
Mostly Cloudy 700 ft
Overcast 1100 ft
Moisture
Humidity
98%
Rainfall
0.00 in
Snow Depth
Not available.
METAR
SPECI KIAD 211259Z 20006KT 6SM BR BKN007 OVC011 21/19 A3001 RMK AO2
Don't speak METAR? Read our FAQ.
Weather Radio
Launch Weather Radio
Temperature
Temperature
70.7 °F
69,69,68,68,68,67,66,67,68,68,68,69,70
Dew Point
70 °F
Wind
Speed / Dir
1.6 mph from West
Wind Gust
4.5 mph
Health
UV
1 out of 16
Pollen
8.10 out of 12
Pollen Forecast
Ozone
Good
PM2.5
Good
Flu Activity
Sporadic
View Flu Map
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Source: BestForecast
Descriptive Forecast
Tuesday
partlycloudy Partly cloudy with a chance of a thunderstorm and a chance of rain in the afternoon. Fog early. High of 88F. Winds from the SSW at 5 to 10 mph. Chance of rain 20%.
Tuesday Night
nt_chancetstorms Partly cloudy with a chance of a thunderstorm and a chance of rain. Low of 68F. Winds from the SSW at 5 to 10 mph. Chance of rain 30%.
Wednesday
chancetstorms Partly cloudy with a chance of a thunderstorm and a chance of rain in the afternoon. High of 86F. Winds from the SSW at 5 to 15 mph. Chance of rain 30%.
Wednesday Night
nt_chancetstorms Mostly cloudy with a chance of a thunderstorm and a chance of rain. Low of 68F. Winds from the SSW at 10 to 15 mph. Chance of rain 40%.
Thursday
chancetstorms Mostly cloudy with a chance of a thunderstorm and a chance of rain. High of 82F. Winds from the SW at 5 to 10 mph. Chance of rain 50%.
Thursday Night
nt_chancetstorms Mostly cloudy with a chance of a thunderstorm and rain. Low of 55F. Winds from the WSW at 5 to 10 mph. Chance of rain 30%.
Friday
clear Partly cloudy with a chance of rain. Fog early. High of 72F. Breezy. Winds from the WNW at 10 to 20 mph. Chance of rain 20%.
Friday Night
nt_clear Clear. Low of 52F. Breezy. Winds from the NW at 15 to 20 mph.
Saturday
clear Clear in the morning, then partly cloudy. High of 72F. Breezy. Winds from the NNW at 15 to 20 mph.
Saturday Night
nt_mostlycloudy Mostly cloudy. Low of 45F. Winds from the NW at 5 to 15 mph.
Sunday
mostlycloudy Mostly cloudy. High of 73F. Winds from the NW at 5 to 10 mph.
Sunday Night
nt_cloudy Overcast. Low of 48F. Winds less than 5 mph.
Monday
mostlycloudy Overcast. High of 72F. Winds less than 5 mph.
Monday Night
nt_partlycloudy Clear. Fog overnight. Low of 52F. Winds from the SSE at 5 to 10 mph.
Tuesday
chancerain Partly cloudy with a chance of rain. Fog early. High of 73F. Winds from the SSE at 5 to 10 mph. Chance of rain 40%.
Tuesday Night
nt_partlycloudy Partly cloudy. Fog overnight. Low of 61F. Winds from the SSE at 5 to 10 mph.
Wednesday
partlycloudy Partly cloudy. High of 79F. Winds less than 5 mph.
Wednesday Night
nt_partlycloudy Partly cloudy. Fog overnight. Low of 63F. Winds less than 5 mph.
Thursday
partlycloudy Partly cloudy. High of 81F. Winds less than 5 mph.
Thursday Night
nt_partlycloudy Partly cloudy. Low of 64F. Winds less than 5 mph.
Friday
partlycloudy Partly cloudy. High of 82F. Winds less than 5 mph.
Friday Night
nt_partlycloudy Clear. Low of 64F. Winds less than 5 mph.
Loading…
 
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Weather Forecast for Herndon VA

View Calendar 10-Day Forecast for station KVAOAKHI5

Tuesday, 21
Chance of a Thunderstorm
88 | 68 °F
Chance of a Thunderstorm
Chance of
Precipitation
20%
Wednesday, 22
Chance of a Thunderstorm
86 | 68 °F
Chance of T-storms
Chance of
Precipitation
30%
Thursday, 23
Chance of a Thunderstorm
82 | 55 °F
Chance of T-storms
Chance of
Precipitation
50%
Friday, 24
Chance of Rain
72 | 52 °F
Chance of Rain
Chance of
Precipitation
20%
Saturday, 25
Clear
72 | 45 °F
Clear
Chance of
Precipitation
0%
Sunday, 26
Mostly Cloudy
73 | 48 °F
Mostly Cloudy
Chance of
Precipitation
0%
Monday, 27
Mostly Cloudy
72 | 52 °F
Mostly Cloudy
Chance of
Precipitation
0%
Tuesday, 28
Chance of Rain
73 | 61 °F
Chance of Rain
Chance of
Precipitation
40%
Wednesday, 29
Partly Cloudy
79 | 63 °F
Partly Cloudy
Chance of
Precipitation
0%
Thursday, 30
Partly Cloudy
81 | 64 °F
Partly Cloudy
Chance of
Precipitation
0%
Source: BestForecast at 4:09 AM EDT on May 21, 2013
Descriptive Forecast
Tuesday
partlycloudy Partly cloudy with a chance of a thunderstorm and a chance of rain in the afternoon. Fog early. High of 88F. Winds from the SSW at 5 to 10 mph. Chance of rain 20%.
Tuesday Night
nt_chancetstorms Partly cloudy with a chance of a thunderstorm and a chance of rain. Low of 68F. Winds from the SSW at 5 to 10 mph. Chance of rain 30%.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 66 | 64 78 | 66 83 | 66 72 | 66
Wind 3 mph SSW 6 mph SSW 9 mph SSW 8 mph SSW
Humidity 94% 65% 56% 85%
Chance of Precip. 10% 10% 20% 30%
Cloud Cover 65% 58% 56% 59%
Conditions Fog Partly Cloudy Chance of a Thunderstorm Chance of a Thunderstorm
Sunrise & Sunset
5:52 AM
8:20 PM
The quality of the forecasted high temperature for this day is good. MaxT RMSE [1.83], Average RMSE [2.29]
The National Weather Service forecast quality is good. MaxT RMSE [2.06], Average RMSE [1.77] : Use NWS
Source: BestForecast at 4:09 AM EDT on May 21, 2013
Descriptive Forecast
Wednesday
chancetstorms Partly cloudy with a chance of a thunderstorm and a chance of rain in the afternoon. High of 86F. Winds from the SSW at 5 to 15 mph. Chance of rain 30%.
Wednesday Night
nt_chancetstorms Mostly cloudy with a chance of a thunderstorm and a chance of rain. Low of 68F. Winds from the SSW at 10 to 15 mph. Chance of rain 40%.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 69 | 65 81 | 66 83 | 65 74 | 65
Wind 7 mph SSW 10 mph SSW 11 mph SSW 10 mph SSW
Humidity 85% 61% 57% 73%
Chance of Precip. 10% 10% 30% 40%
Cloud Cover 69% 69% 68% 90%
Conditions Mostly Cloudy Mostly Cloudy Chance of a Thunderstorm Chance of a Thunderstorm
Sunrise & Sunset
5:51 AM
8:21 PM
The quality of the forecasted high temperature for this day is good. MaxT RMSE [2.10], Average RMSE [2.75]
The National Weather Service forecast quality is good. MaxT RMSE [2.50], Average RMSE [1.96] : Use NWS
Source: BestForecast at 4:09 AM EDT on May 21, 2013
Descriptive Forecast
Thursday
chancetstorms Mostly cloudy with a chance of a thunderstorm and a chance of rain. High of 82F. Winds from the SW at 5 to 10 mph. Chance of rain 50%.
Thursday Night
nt_chancetstorms Mostly cloudy with a chance of a thunderstorm and rain. Low of 55F. Winds from the WSW at 5 to 10 mph. Chance of rain 30%.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 70 | 64 75 | 64 76 | 63 66 | 63
Wind 8 mph SSW 8 mph SW 6 mph SW 7 mph SW
Humidity 83% 67% 65% 90%
Chance of Precip. 40% 50% 50% 30%
Cloud Cover 72% 84% 68% 45%
Conditions Chance of a Thunderstorm Chance of a Thunderstorm Chance of a Thunderstorm Chance of a Thunderstorm
Sunrise & Sunset
5:50 AM
8:22 PM
The quality of the forecasted high temperature for this day is fair. MaxT RMSE [2.53], Average RMSE [2.21]
The National Weather Service forecast quality is fair. MaxT RMSE [2.61], Average RMSE [2.46] : Use NWS
Source: BestForecast at 4:09 AM EDT on May 21, 2013
Descriptive Forecast
Friday
clear Partly cloudy with a chance of rain. Fog early. High of 72F. Breezy. Winds from the WNW at 10 to 20 mph. Chance of rain 20%.
Friday Night
nt_clear Clear. Low of 52F. Breezy. Winds from the NW at 15 to 20 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 59 | 56 66 | 56 69 | 48 56 | 44
Wind 7 mph WNW 13 mph WNW 16 mph NW 14 mph NW
Humidity 91% 71% 47% 61%
Chance of Precip. 10% 20% 10% 10%
Cloud Cover 74% 13% 0% 0%
Conditions Mostly Cloudy Chance of Rain Clear Clear
Sunrise & Sunset
5:50 AM
8:23 PM
The quality of the forecasted high temperature for this day is fair. MaxT RMSE [3.18], Average RMSE [2.68]
The National Weather Service forecast quality is fair. MaxT RMSE [3.12], Average RMSE [2.78] : Use NWS
Source: BestForecast at 4:09 AM EDT on May 21, 2013
Descriptive Forecast
Saturday
clear Clear in the morning, then partly cloudy. High of 72F. Breezy. Winds from the NNW at 15 to 20 mph.
Saturday Night
nt_mostlycloudy Mostly cloudy. Low of 45F. Winds from the NW at 5 to 15 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 54 | 37 67 | 36 69 | 40 55 | 37
Wind 16 mph NW 17 mph NNW 12 mph NNW 9 mph NNW
Humidity 53% 31% 34% 49%
Chance of Precip. 10% 0% 0% 0%
Cloud Cover 10% 0% 42% 97%
Conditions Clear Clear Partly Cloudy Overcast
Sunrise & Sunset
5:49 AM
8:24 PM
The quality of the forecasted high temperature for this day is poor. MaxT RMSE [4.06], Average RMSE [2.69]
The National Weather Service forecast quality is poor. MaxT RMSE [3.89], Average RMSE [3.33] : Use NWS
Source: BestForecast at 4:09 AM EDT on May 21, 2013
Descriptive Forecast
Sunday
mostlycloudy Mostly cloudy. High of 73F. Winds from the NW at 5 to 10 mph.
Sunday Night
nt_cloudy Overcast. Low of 48F. Winds less than 5 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 47 | 35 65 | 39 71 | 40 57 | 39
Wind 7 mph NW 7 mph NNW 4 mph NNW 2 mph SW
Humidity 62% 36% 33% 52%
Chance of Precip. 0% 0% 0% 0%
Cloud Cover 91% 87% 89% 99%
Conditions Overcast Mostly Cloudy Overcast Overcast
Sunrise & Sunset
5:48 AM
8:24 PM
The quality of the forecasted high temperature for this day is poor. MaxT RMSE [4.75], Average RMSE [3.40]
The National Weather Service forecast quality is poor. MaxT RMSE [3.90], Average RMSE [3.44] : Use NWS
Source: BestForecast at 4:09 AM EDT on May 21, 2013
Descriptive Forecast
Monday
mostlycloudy Overcast. High of 72F. Winds less than 5 mph.
Monday Night
nt_partlycloudy Clear. Fog overnight. Low of 52F. Winds from the SSE at 5 to 10 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 49 | 40 62 | 46 62 | 53 53 | 53
Wind 5 mph NNE 5 mph East 5 mph SSE 6 mph SSE
Humidity 67% 52% 69% 96%
Chance of Precip. 0% 0% 0% 0%
Cloud Cover 99% 100% 96% 0%
Conditions Overcast Overcast Overcast Fog
Sunrise & Sunset
5:48 AM
8:25 PM
The quality of the forecasted high temperature for this day is poor. MaxT RMSE [5.43], Average RMSE [2.96]
The National Weather Service forecast quality is fair. MaxT RMSE [3.41], Average RMSE [3.67] : Use NWS
Source: BestForecast at 4:09 AM EDT on May 21, 2013
Descriptive Forecast
Tuesday
chancerain Partly cloudy with a chance of rain. Fog early. High of 73F. Winds from the SSE at 5 to 10 mph. Chance of rain 40%.
Tuesday Night
nt_partlycloudy Partly cloudy. Fog overnight. Low of 61F. Winds from the SSE at 5 to 10 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 54 | 52 67 | 61 63 | 62 62 | 62
Wind 4 mph SSE 7 mph SSE 8 mph SSE 6 mph SSE
Humidity 98% 78% 96% 98%
Chance of Precip. 20% 10% 20% 10%
Cloud Cover 18% 51% 17% 32%
Conditions Chance of Rain Partly Cloudy Chance of Rain Fog
Sunrise & Sunset
5:47 AM
8:26 PM
The quality of the forecasted high temperature for this day is poor. MaxT RMSE [5.27], Average RMSE [4.42]
Source: BestForecast at 4:09 AM EDT on May 21, 2013
Descriptive Forecast
Wednesday
partlycloudy Partly cloudy. High of 79F. Winds less than 5 mph.
Wednesday Night
nt_partlycloudy Partly cloudy. Fog overnight. Low of 63F. Winds less than 5 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 63 | 62 74 | 64 72 | 67 65 | 65
Wind 4 mph South 4 mph South 4 mph SSE 3 mph SSE
Humidity 96% 72% 83% 100%
Chance of Precip. 0% 0% 0% 0%
Cloud Cover 56% 65% 58% 51%
Conditions Partly Cloudy Mostly Cloudy Partly Cloudy Fog
Sunrise & Sunset
5:47 AM
8:27 PM
The quality of the forecasted high temperature for this day is poor. MaxT RMSE [6.11], Average RMSE [4.98]
Source: BestForecast at 4:09 AM EDT on May 21, 2013
Descriptive Forecast
Thursday
partlycloudy Partly cloudy. High of 81F. Winds less than 5 mph.
Thursday Night
nt_partlycloudy Partly cloudy. Low of 64F. Winds less than 5 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 65 | 64 77 | 65 75 | 66 67 | 65
Wind 2 mph South 3 mph South 4 mph South 4 mph South
Humidity 97% 67% 75% 97%
Chance of Precip. 0% 0% 0% 0%
Cloud Cover 45% 41% 40% 35%
Conditions Fog Partly Cloudy Partly Cloudy Partly Cloudy
Sunrise & Sunset
5:46 AM
8:27 PM
Source: BestForecast at 4:09 AM EDT on May 21, 2013
Descriptive Forecast
Friday
partlycloudy Partly cloudy. High of 82F. Winds less than 5 mph.
Friday Night
nt_partlycloudy Clear. Low of 64F. Winds less than 5 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 69 | 65 79 | 66 75 | 68 67 | 67
Wind 2 mph SSW 2 mph SSW 3 mph South 3 mph South
Humidity 90% 65% 76% 97%
Chance of Precip. 0% 0% 0% 0%
Cloud Cover 26% 31% 50% %
Conditions Partly Cloudy Partly Cloudy Partly Cloudy Clear
Sunrise & Sunset
Sun does not rise
Scientific Forecaster Discussion — MOS Weather Graph
Nearby
History & Almanac
May 21, 2013 Max Temp Min Temp
Normal (KIAD) 76 °F 53 °F
Record (KIAD) 92 °F (1996) 33 °F (1992)
Yesterday 81 °F 66 °F
Yesterday's Cooling Degree Days: 9
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
PM10
Yesterday Good
OZONE
Current Good
PM2.5
Current Good
OZONE
Tuesday Moderate
PM2.5
Tuesday Good
OZONE
Wednesday Good
OZONE
Wednesday Good
PM2.5
Thursday Good
OZONE
Thursday Good
PM2.5
Friday Good
OZONE
Friday Good
PM2.5
Coastal Water Temperatures
Place Temperature
Washington, DC 66.9 °F
Baltimore, MD 66.9 °F
Solomons Island, MD 66.9 °F
Marine Forecast
Astronomy
May. 21, 2013 Rise Set
Actual Time 5:52 AM EDT 8:20 PM EDT
Civil Twilight 5:21 AM EDT 8:51 PM EDT
Nautical Twilight 4:43 AM EDT 9:29 PM EDT
Astronomical Twilight 4:01 AM EDT 10:11 PM EDT
Moon 4:34 PM EDT 3:16 AM EDT
Length Of Visible Light 15h 30m
Length of Day
14h 28m
Tomorrow will be 1m 33s longer.
Waxing Gibbous, 83% 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
73 °F
Wallops Island
73 °F
Newport News
73 °F
Melfa
71 °F
Langley AFB
71 °F
Farmville
57 °F
Dublin
57 °F
Marion
59 °F
Jonesville
59 °F
Abingdon
60 °F
Hot Springs
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
Dulles Airport 70 °F Overcast 8:59 AM EDT
Leesburg 70 °F Overcast 8:55 AM EDT
Manassas 70 °F Overcast 8:55 AM EDT
Fort Belvoir 70 °F Overcast 8:58 AM EDT
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Flight To ETA Status
SWA3408
Chicago, IL 		KIAD 09:10AM On Time
JIA2278
Charlotte, NC 		KIAD 09:12AM On Time
MTN8313
Newark, NJ 		KIAD 09:53AM On Time
SCX8605
Des Moines, IA 		KIAD 09:55AM On Time
Flight Tracker by FlightAware FlightAware
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Type Condition
Flight Rule: IFR (KIAD)
Wind Speed: 6.0 kts.
Wind Dir: 270° (West)
Ceiling: 700 ft

SPECI KIAD 211259Z 20006KT 6SM BR BKN007 OVC011 21/19 A3001 RMK AO2

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Nearby Events
Event Date Forecast
Jason Masi 9:00 PM EDT
2013-04-16		 Chance of Rain, 69°F
Acoustic Tuesday 9:00 PM EDT
2013-04-16		 Chance of Rain, 69°F
Ringling Bros. and Barnum & Bailey: Dragons 7:00 PM EDT
2013-04-18		 Chance of a Thunderstorm, 73°F
Bobby Long 8:00 PM EDT
2013-04-18		 Mostly Cloudy, 70°F
Ringling Bros. and Barnum & Bailey: Dragons 7:00 PM EDT
2013-04-19		 Thunderstorm, 65°F
Ringling Bros. and Barnum & Bailey: Dragons 1:00 PM EDT
2013-04-19		 Overcast, 73°F
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
Chantilly Highlands, Herndon, VA 70.7 °F - 70 °F 98% West  at  1.6 mph 0.00 in / hr 340 ft 9:11 AM EDT Rapid Fire  
Folkstone, Oak Hill, VA 69.2 °F - 68 °F 95% ESE  at  0.0 mph 0.00 in / hr 375 ft 9:10 AM EDT Rapid Fire  
Fox Mill, Herndon, VA 71.2 °F 76 °F 39 °F 31% NW  at  0.0 mph 0.00 in / hr 383 ft 9:10 AM EDT Rapid Fire  
Wind Power Cube, Chantilly, VA 71.6 °F - 69 °F 91% SW  at  4.5 mph 0.00 in / hr 203 ft 9:10 AM EDT Normal  
NonFedAWOS WASHINGTON DULLES , Dulles, VA 70 °F - 66 °F 88% South  at  8 mph 0.00 in / hr 1023 ft 8:29 AM EDT MADIS
Cedar Cove Cluster, Reston, VA 70.3 °F - 67 °F 88% West  at  0.0 mph 0.00 in / hr 350 ft 9:10 AM EDT Rapid Fire  
Golf Course Island, Reston, VA 69.6 °F - 66 °F 87% South  at  0.0 mph 0.00 in / hr 390 ft 9:07 AM EDT Rapid Fire  
VADOT Site_G, Herndon, VA 69 °F - 65 °F 87% SSW  at  3 mph 0.00 in / hr 339 ft 8:24 AM EDT MADIS
Ridings at Blue Springs, Chantilly, VA 69.1 °F - 67 °F 93% SSW  at  0.0 mph 0.00 in / hr 303 ft 9:06 AM EDT Normal
VADOT Site_C, Oakton, VA 70 °F - 66 °F 87% North  at  - 0.00 in / hr 290 ft 8:27 AM EDT MADIS
APRSWXNET Reston VA , Herndon, VA 69 °F - 67 °F 94% SW  at  1 mph 0.00 in / hr 400 ft 8:37 AM EDT MADIS
Hawk Ridge Subdivision, Reston, VA 68.8 °F - 67 °F 95% SE  at  0.0 mph 0.00 in / hr 300 ft 9:10 AM EDT Normal
APRSWXNET Reston VA , Herndon, VA 69 °F - 66 °F 90% SSW  at  0 mph 0.00 in / hr 454 ft 8:48 AM EDT MADIS
Shaker Woods, Herndon, VA 70.2 °F - 67 °F 90% NW  at  0.7 mph 0.00 in / hr 387 ft 9:10 AM EDT Rapid Fire  
VADOT Site_E, Oakton, VA 71 °F - 69 °F 94% North  at  - 0.00 in / hr 353 ft 8:30 AM EDT MADIS
Falls Brook, Herndon, VA 69.9 °F - 68 °F 92% SE  at  0.0 mph 0.00 in / hr 280 ft 9:09 AM EDT Normal  
Colvin Run at Hunter Mill Rd (One Lane B, Vienna, VA 69.2 °F - 66 °F 90% SW  at  0.0 mph 0.00 in / hr 295 ft 9:10 AM EDT Normal  
Lake Fairfax, Vienna, VA 69.8 °F - 67 °F 90% WSW  at  3.0 mph 0.00 in / hr 275 ft 9:10 AM EDT Rapid Fire
Trott Ave, Vienna, VA 69.2 °F - 68 °F 95% NW  at  0.0 mph - / hr 415 ft 9:06 AM EDT Normal  
APRSWXNET Centreville VA , Centreville, VA 69 °F - 67 °F 93% SSW  at  0 mph 0.00 in / hr 308 ft 8:38 AM EDT MADIS
Rosehaven Estates, Fairfax, VA 72.3 °F - 70 °F 93% SSE  at  1.0 mph 20.35 in / hr 470 ft 9:00 AM EDT Normal  
Little Rocky Run, Centreville, VA 69.3 °F - 67 °F 92% SSW  at  0.0 mph 0.00 in / hr 308 ft 9:10 AM EDT Rapid Fire  
CENTREweather, Centreville, VA 69.2 °F - 66 °F 91% North  at  0.0 mph 0.00 in / hr 262 ft 9:10 AM EDT Rapid Fire
Centreville, VA, Centreville, VA 69.1 °F - 66 °F 90% South  at  2.7 mph - / hr 351 ft 9:05 AM EDT Normal  
Cobbdale, Fairfax, VA 69.4 °F - 66 °F 90% ESE  at  0.0 mph - / hr 394 ft 9:05 AM EDT Normal  
Villa D'este, Fairfax, VA 69.2 °F - 67 °F 92% WSW  at  0.0 mph 0.00 in / hr 354 ft 8:56 AM EDT Normal  
Beulah-Wolf Trap, Vienna, VA 69.3 °F - 66 °F 90% SE  at  0.0 mph 0.00 in / hr 430 ft 9:07 AM EDT Normal  
NE Vienna, Vienna, VA 69.3 °F - 67 °F 91% SE  at  0.0 mph - / hr 417 ft 8:59 AM EDT Normal  
Little Rocky Run, Clifton, VA 69.6 °F - 68 °F 94% South  at  0.7 mph 0.00 in / hr 302 ft 9:10 AM EDT Rapid Fire  
Brambleton, Brambleton, VA 70.8 °F - 68 °F 92% West  at  0.0 mph 0.00 in / hr 310 ft 9:10 AM EDT Rapid Fire  
Vienna Woods, Vienna, VA 71.2 °F - 69 °F 92% ESE  at  1.1 mph - / hr 361 ft 9:01 AM EDT Normal  
Stone Ridge, Stone Ridge, VA 73.2 °F 72 °F 69 °F 86% East  at  0.0 mph 0.00 in / hr 365 ft 9:11 AM EDT Rapid Fire  
Wolf Trap Woods, Vienna, VA 68.6 °F - 68 °F 96% ESE  at  1.0 mph 0.00 in / hr 0 ft 9:02 AM EDT Normal  
Cedar Crest, Chantilly, VA 69.6 °F - 68 °F 93% SW  at  2.0 mph 0.00 in / hr 292 ft 9:08 AM EDT Normal  
Great Falls VA, Great Falls, VA 68.9 °F - 66 °F 91% SSW  at  2.0 mph 0.00 in / hr 380 ft 9:10 AM EDT Normal
APRSWXNET Great Falls VA , Great Falls, VA 68 °F - 65 °F 91% South  at  2 mph 0.00 in / hr 380 ft 8:49 AM EDT MADIS
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