O'Fallon, MO

2:58 AM CST on February 13, 2012 (GMT -0600)
Elev: 531 ft
Lon: 90.7° W
Lat: 38.8° N
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Active Advisory: Winter Weather Advisory (US Severe Weather)
Tropical Weather: Tropical Cyclone Giovanna (South Indian Ocean) Tropical Cyclone Jasmine (Southern Pacific)
Weather Summary
Jessica Parker
Weather Underground Forecast for Monday, February 13, 2012.

The trough of low pressure that brought unsettled weather to the West on Sunday will advance into the Plains on Monday with more mixed precipitation. The trough will support a low and associated warm front moving eastward into the Southern Plains. As the system progresses, rain showers with periods of heavy rain and isolated thunderstorms will spread from parts of central/eastern Texas into western Louisiana, mixed precipitation will develop in parts of Oklahoma and Arkansas, and snow will blanket parts of the Central Plains, Mid-Mississippi Valley, and parts of the western Ohio Valley. Areas from eastern Texas through Arkansas should expect the heaviest precipitation totals. Heightened winter weather conditions will allow Winter Weather Advisories and a few Winter Storm Warnings to remain in effect through the day. Elsewhere east of the Continental Divide, lake-effect snow showers will continue along parts of the Lower Great Lakes Snowbelt.

In the West, a Pacific cold front pushing across the Pacific Northwest will drop southward across northern California, bringing coastal and valley rain and significant snowfall to the Sierra Nevadas.
Weather Underground Forecast for Monday, February 13, 2012.

The trough of low pressure that brought unsettled weather to the West on Sunday will advance into the Plains on Monday with more mixed precipitation. The trough will support a low and associated warm front moving eastward into the Southern Plains. As the system progresses, rain showers with periods of heavy rain and isolated thunderstorms will spread from parts of central/eastern Texas into western Louisiana, mixed precipitation will develop in parts of Oklahoma and Arkansas, and snow will blanket parts of the Central Plains, Mid-Mississippi Valley, and parts of the western Ohio Valley. Areas from eastern Texas through Arkansas should expect the heaviest precipitation totals. Heightened winter weather conditions will allow Winter Weather Advisories and a few Winter Storm Warnings to remain in effect through the day. Elsewhere east of the Continental Divide, lake-effect snow showers will continue along parts of the Lower Great Lakes Snowbelt.

In the West, a Pacific cold front pushing across the Pacific Northwest will drop southward across northern California, bringing coastal and valley rain and significant snowfall to the Sierra Nevadas.
Weather Underground Broadcast Network
O'Fallon Weather at a Glance
Updated 2:58 AM CST
Weather Station - report
Royal Oaks, O'Fallon
Elevation
593 ft
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Now
Overcast
Overcast
Temperature
29.7 °F
Feels Like 30 °F
Wind(mph)
1.0
Sunrise / Set
6:57 AM
5:37 PM
Moon
Waning Gibbous
Tonight
Mostly Cloudy 22 °F
Mostly Cloudy
Monday
Snow 31 °F
Snow
100% chance of precipitation
Monday Night
Ice Pellets 29 °F
Ice Pellets
100% chance of precipitation
Tuesday
Mostly Cloudy 40 | 27 °F
Mostly Cloudy
Wednesday
Chance of Rain 45 | 38 °F
Chance of Rain
30% chance of precipitation
Thursday
Chance of Rain 47 | 29 °F
Chance of Rain
20% chance of precipitation
Today is forecast to be Cooler than yesterday.
Conditions
Pressure
30.23 in
Visibility
10.0 miles
Clouds
Overcast 7500 ft
Moisture
Humidity
44%
Rainfall
0.00 in
Snow Depth
Not available.
METAR
METAR KSUS 130854Z AUTO 00000KT 10SM OVC075 M02/M08 A3021 RMK AO2 SLP239 T10221078 58019
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Weather Radio
Launch Weather Radio
Temperature
Windchill
30 °F
Dew Point
10 °F
Wind
Speed / Dir
1.0 mph from South
Wind Gust
6.0 mph
Health
UV
0 out of 16
Pollen
.40 out of 12
Pollen Forecast
Air Quality
Not available.
Flu Activity
Regional
View Flu Map
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Regional Forecast for St. Charles
Monday
chancesnow Chance of snow early in the morning...then snow in the late morning and afternoon. Snow accumulation of 1 to 2 inches. High in the lower 30s. South wind 10 to 15 mph. Chance of snow near 100 percent.
Monday Night
nt_snow Snow in the evening...then chance of light snow and patchy freezing drizzle after midnight. Snow accumulation around 2 inches. Total snow accumulation 3 to 4 inches. Near steady temperature around 30. South wind around 10 mph. Chance of measurable precipitation near 100 percent.
Tuesday
cloudy Mostly cloudy in the morning and early afternoon then becoming partly cloudy. High around 40. West wind around 10 mph.
Tuesday Night
nt_partlycloudy Partly cloudy. Low in the upper 20s. Light wind.
Wednesday
chancerain Mostly cloudy. A 30 percent chance of rain in the afternoon. High in the upper 40s.
Wednesday Night
nt_rain Rain likely. Low around 40. Chance of rain 70 percent.
Thursday
chancerain Partly sunny with a 30 percent chance of rain. High in the upper 40s.
Thursday Night and Friday
nt_partlycloudy Partly cloudy. Low around 30. High in the mid 40s.
Friday Night and Saturday
nt_sunny Mostly clear. Low around 30. High around 50.
Saturday Night and Sunday
nt_partlycloudy Partly cloudy. Low in the lower 30s. High around 50.
Source: NWS at 11:56 PM CST on February 12, 2012
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Nowcast
Winter Weather Advisory in effect from 9 am Monday to midnight CST Monday night...
Forecast
View Calendar 7-Day Weather Forecast for 63366
Monday, 13
Snow
31 | 29 °F
Snow
Chance of
Precipitation
100%
Tuesday, 14
Mostly Cloudy
40 | 27 °F
Mostly Cloudy
Chance of
Precipitation
10%
Wednesday, 15
Chance of Rain
45 | 38 °F
Chance of Rain
Chance of
Precipitation
30%
Thursday, 16
Chance of Rain
47 | 29 °F
Chance of Rain
Chance of
Precipitation
20%
Friday, 17
Partly Cloudy
45 | 27 °F
Partly Cloudy
Chance of
Precipitation
10%
Saturday, 18
Partly Cloudy
50 | 31 °F
Partly Cloudy
Chance of
Precipitation
10%
Sunday, 19
Partly Cloudy
50 | NA
Partly Cloudy
Chance of
Precipitation
10%
Source: NWS at 11:56 PM CST on February 12, 2012
Regional Forecast for St. Charles
Rest of Tonight
nt_cloudy Cloudy. Low in the lower 20s. Temperature steady or slowly rising through sunrise. Light wind.
Monday
chancesnow Chance of snow early in the morning...then snow in the late morning and afternoon. Snow accumulation of 1 to 2 inches. High in the lower 30s. South wind 10 to 15 mph. Chance of snow near 100 percent.
Monday Night
nt_snow Snow in the evening...then chance of light snow and patchy freezing drizzle after midnight. Snow accumulation around 2 inches. Total snow accumulation 3 to 4 inches. Near steady temperature around 30. South wind around 10 mph. Chance of measurable precipitation near 100 percent.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 29 | 9 29 | 22 31 | 27 29 | 29
Wind 6 mph South 12 mph South 8 mph South 6 mph South
Humidity 42% 74% 88% 96%
Chance of Precip. 10% 100% 100% 100%
Cloud Cover 100% 100% 100% 100%
Conditions Chance of Snow Snow Snow Ice Pellets
Sunrise & Sunset
6:57 AM
5:37 PM
Source: NWS at 11:56 PM CST on February 12, 2012
Regional Forecast for St. Charles
Tuesday
cloudy Mostly cloudy in the morning and early afternoon then becoming partly cloudy. High around 40. West wind around 10 mph.
Tuesday Night
nt_partlycloudy Partly cloudy. Low in the upper 20s. Light wind.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 29 | 29 36 | 31 36 | 31 31 | 27
Wind 5 mph SW 6 mph West 5 mph West 4 mph SSW
Humidity 99% 81% 81% 88%
Chance of Precip. 100% 10% 10% 0%
Cloud Cover 100% 79% 29% 40%
Conditions Overcast Mostly Cloudy Partly Cloudy Partly Cloudy
Sunrise & Sunset
6:55 AM
5:38 PM
Source: NWS at 11:56 PM CST on February 12, 2012
Regional Forecast for St. Charles
Wednesday
chancerain Mostly cloudy. A 30 percent chance of rain in the afternoon. High in the upper 40s.
Wednesday Night
nt_rain Rain likely. Low around 40. Chance of rain 70 percent.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 29 | 27 40 | 36 43 | 38 40 | 40
Wind 2 mph South 6 mph SSE 6 mph SE 4 mph South
Humidity 91% 85% 82% 95%
Chance of Precip. 0% 40% 40% 70%
Cloud Cover 70% 87% 100% 98%
Conditions Mostly Cloudy Chance of Rain Rain Rain
Sunrise & Sunset
6:54 AM
5:39 PM
Source: NWS at 11:56 PM CST on February 12, 2012
Regional Forecast for St. Charles
Thursday
chancerain Partly sunny with a 30 percent chance of rain. High in the upper 40s.
Thursday Night and Friday
nt_partlycloudy Partly cloudy. Low around 30. High in the mid 40s.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 38 | 38 45 | 38 43 | 34 36 | 31
Wind 1 mph West 7 mph West 7 mph West 6 mph West
Humidity 96% 75% 73% 81%
Chance of Precip. 70% 20% 20% 10%
Cloud Cover 82% 55% 32% 42%
Conditions Chance of Rain Chance of Rain Partly Cloudy Partly Cloudy
Sunrise & Sunset
6:53 AM
5:41 PM
Source: NWS at 11:56 PM CST on February 12, 2012
Regional Forecast for St. Charles
Thursday Night and Friday
nt_partlycloudy Partly cloudy. Low around 30. High in the mid 40s.
Friday Night and Saturday
nt_sunny Mostly clear. Low around 30. High around 50.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 31 | 27 41 | 27 40 | 27 34 | 25
Wind 6 mph WNW 8 mph WNW 6 mph WNW 4 mph West
Humidity 84% 55% 57% 72%
Chance of Precip. 10% 10% 10% 10%
Cloud Cover 49% 34% 20% 21%
Conditions Partly Cloudy Partly Cloudy Clear Clear
Sunrise & Sunset
6:52 AM
5:42 PM
Source: NWS at 11:56 PM CST on February 12, 2012
Regional Forecast for St. Charles
Friday Night and Saturday
nt_sunny Mostly clear. Low around 30. High around 50.
Saturday Night and Sunday
nt_partlycloudy Partly cloudy. Low in the lower 30s. High around 50.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 29 | 25 45 | 31 45 | 32 38 | 31
Wind 2 mph SW 6 mph West 4 mph South 4 mph West
Humidity 80% 57% 60% 76%
Chance of Precip. 10% 10% 10% 10%
Cloud Cover 29% 26% 30% 30%
Conditions Partly Cloudy Partly Cloudy Partly Cloudy Partly Cloudy
Sunrise & Sunset
6:52 AM
5:42 PM
Source: NWS at 11:56 PM CST on February 12, 2012
Regional Forecast for St. Charles
Saturday Night and Sunday
nt_partlycloudy Partly cloudy. Low in the lower 30s. High around 50.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 34 | 29 45 | 34 45 | 32 38 | 31
Wind 2 mph SW 8 mph South 4 mph South 4 mph West
Humidity 81% 62% 60% 76%
Chance of Precip. 10% 10% 10% 10%
Cloud Cover 52% 45% 30% 30%
Conditions Partly Cloudy Partly Cloudy Partly Cloudy Partly Cloudy
Sunrise & Sunset
6:52 AM
5:42 PM
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Scientific Forecaster Discussion — MOS Weather Graph
Nearby
History & Almanac
February 13, 2012 Max Temp Min Temp
Normal (KSUS) 44 °F 26 °F
Record (KSUS) 63 °F (2011) 10 °F (2008)
Yesterday 36.4 °F 14.5 °F
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
Astronomy
Feb. 13, 2012 Rise Set
Actual Time 6:57 AM CST 5:37 PM CST
Civil Twilight 6:29 AM CST 6:05 PM CST
Nautical Twilight 5:58 AM CST 6:36 PM CST
Astronomical Twilight 5:27 AM CST 7:07 PM CST
Moon No Moon Rise 10:00 AM CST
Length Of Visible Light 11h 35m
Length of Day
10h 40m
Tomorrow will be 2m 19s longer.
Waning Gibbous, 65% of the Moon is Illuminated
Today
Waning Gibbous
Feb 14
Last Quarter
Feb 21
New
Feb 29
First Quarter
Mar 8
Full
Visit Astronomy
Today's Extremes
State Highs State Lows
36 °F
Joplin
35 °F
Clinton
35 °F
Sedalia
35 °F
Kansas City
34 °F
Whiteman AFB
21 °F
Farmington
21 °F
Cape Girardeau
23 °F
Spirit of St Louis
25 °F
Poplar Bluff
27 °F
St. Charles
Source: NWS
Snow Depth
Station Depth Elevation
No new snow has been reported.
Snow Depth Reports — Snow Depth Map
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Travel Planning
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Aviation
City Temp. Conditions Updated
Spirit of St Louis 28 °F Overcast 2:54 AM CST
St. Charles 28 °F Overcast 2:54 AM CST
St. Louis 31 °F Overcast 2:51 AM CST
Cahokia 27 °F Overcast 2:53 AM CST
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Flight To ETA Status
No flights were found.
Flight Tracker by FlightAware FlightAware
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Type Condition
Flight Rule: VFR (KSUS)
Wind Speed: 0.0 kts.
Wind Dir: 176° (South)
Ceiling: 7500 ft

METAR KSUS 130854Z AUTO 00000KT 10SM OVC075 M02/M08 A3021 RMK AO2 SLP239 T10221078 58019

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Nearby Events
Event Date Forecast
Steel Magnolias 8:00 PM CST 2012-02-17 Partly Cloudy, 38°F
Steel Magnolias 8:00 PM CST 2012-02-18 Clear, 32°F
Try hockey for free day! 12:00 PM CST 2012-02-18 Partly Cloudy, 52°F
Steel Magnolias 2:00 PM CST 2012-02-19 Overcast, 47°F
Event data courtesy eviesays.com
Sports
Event Date Forecast
Budweiser Shootout 8:29 PM EST on February 18, 2012 Partly Cloudy, 59 °F
Gatorade Duel 1 2:19 PM EST on February 23, 2012 Average High 70° F/ 21° C
Event Date Forecast
Northern Trust Open 8:30 AM PST on February 16, 2012 Clear, 63 °F
Northern Trust Open 8:30 AM PST on February 17, 2012 Clear, 63 °F
BMW Championship 8:30 AM CDT on September 06, 2012 Average High 85° F/ 29° C
BMW Championship 8:30 AM CDT on September 07, 2012 Average High 85° F/ 29° C
View all Sports Weather
Weather Stations
Station Location Temp. Windchill Dew Point Humidity Wind Precipitation Elevation Updated Type Website
Royal Oaks, O'Fallon, MO 29.7 °F 30 °F 10 °F 44% South  at  1.0 mph 0.00 in / hr 593 ft 2:58 AM CST Rapid Fire
O'fallon / St. Peters, St. Peters, MO 30.6 °F 31 °F 8 °F 38% South  at  0.0 mph 0.00 in / hr 500 ft 2:58 AM CST Rapid Fire
Ridgepointe, Lake Saint Louis, MO 30.2 °F 30 °F 11 °F 45% North  at  0.0 mph 0.00 in / hr 580 ft 2:55 AM CST Normal  
Twin Chimneys, O'Fallon, MO 28.2 °F 28 °F 15 °F 57% SW  at  0.0 mph 0.00 in / hr 590 ft 2:55 AM CST Normal  
Pennial Park, O'Fallon, MO 29.3 °F 29 °F 9 °F 42% SSE  at  3.0 mph 0.00 in / hr 518 ft 2:55 AM CST Normal
Lake Saint Louis, Lake Saint Louis, MO 30.3 °F 30 °F 10 °F 43% South  at  2.0 mph 0.00 in / hr 640 ft 2:58 AM CST Normal  
Highland Estates, Wentzville, MO 29.8 °F 30 °F 12 °F 47% SSE  at  1.0 mph 0.00 in / hr 548 ft 2:55 AM CST Normal  
Stone Meadows, Wentzville, MO 29.5 °F 30 °F -4 °F 23% SE  at  0.0 mph 0.00 in / hr 600 ft 2:58 AM CST Rapid Fire  
APRSWXNET Saint Peters M, Saint Peters, MO 30 °F 30 °F 9 °F 40% SSE  at  0 mph 0.00 in / hr 511 ft 2:35 AM CST MADIS
West Drive, St. Peters, MO 30.0 °F 30 °F 11 °F 42% SE  at  1.0 mph 0.00 in / hr 560 ft 2:58 AM CST Rapid Fire
Settlers Pointe, Wentzville, MO 28.5 °F 28 °F 17 °F 61% ESE  at  0.0 mph 0.00 in / hr 536 ft 2:55 AM CST Normal  
Saint Charles Hills, Saint Charles, MO 29.7 °F 30 °F 9 °F 41% ESE  at  1.2 mph 0.00 in / hr 475 ft 2:58 AM CST Rapid Fire
Harvester, St. Charles, MO 29.4 °F 29 °F 14 °F 52% SE  at  0.0 mph 0.00 in / hr 558 ft 2:47 AM CST Normal
Danielle Downs, St. Peters, MO 24.8 °F 25 °F 6 °F 44% NNW  at  2.2 mph 0.00 in / hr 561 ft 2:58 AM CST Rapid Fire  
Kohler's Grove, Defiance, MO 28.4 °F 28 °F 7 °F 40% SW  at  0.0 mph - / hr 588 ft 2:57 AM CST Normal  
HADS MISS RVR AT LOCK & DAM 25 AT WIN MO, Winfield, MO - - - - North  at  - 0.00 in / hr 450 ft 2:30 AM CST MADIS
Indian Ridge Farms, Defiance, MO 29.1 °F 29 °F 6 °F 38% ESE  at  0.0 mph 0.00 in / hr 742 ft 2:47 AM CST Normal  
Fox Hill, Saint Charles, MO 30.4 °F 27 °F -6 °F 20% SE  at  3.1 mph 0.00 in / hr 577 ft 2:58 AM CST Normal  
Historic Saint Charles, Saint Charles, MO 30.4 °F 30 °F 12 °F 45% SSW  at  0.0 mph 0.00 in / hr 534 ft 2:58 AM CST Normal  
Incline Village, Foristell, MO 30.2 °F 30 °F 10 °F 43% SSE  at  3.0 mph 0.00 in / hr 596 ft 2:58 AM CST Rapid Fire
HADS MISSOURI RIVER AT ST CHARLES MO, Saint Charles, MO - - - - North  at  - 0.00 in / hr 450 ft 2:30 AM CST MADIS
Batchtown, Batchtown, IL 30.0 °F 30 °F 13 °F 50% SSE  at  0.0 mph 0.00 in / hr 590 ft 2:53 AM CST Normal  
Polestar Boating Center, St. Charles, MO 28.8 °F 29 °F 22 °F 74% East  at  0.0 mph 0.00 in / hr 449 ft 2:58 AM CST Rapid Fire
Old Farm Estates, St. Louis, MO 30.3 °F 30 °F 14 °F 51% SSE  at  2.0 mph 0.00 in / hr 550 ft 2:58 AM CST Rapid Fire  
Chesterfield (East), Chesterfield, MO 28.6 °F 29 °F 12 °F 49% SE  at  1.0 mph 0.00 in / hr 530 ft 2:58 AM CST Normal
Maryland Heights, MO 28.6 °F 29 °F 4 °F 36% SSE  at  0.0 mph 0.00 in / hr 500 ft 2:58 AM CST Rapid Fire  
Creve Coeur, St. Louis, MO 29.5 °F 30 °F -2 °F 25% North  at  0.0 mph 0.00 in / hr 512 ft 2:58 AM CST Normal  
HADS CREVE COEUR CREEK AT CHESTERFIEL MO, Chesterfield, MO - - - - North  at  - 0.00 in / hr 500 ft 2:00 AM CST MADIS
Winding Trails, Ballwin, MO 28.7 °F 29 °F 11 °F 47% SSE  at  0.0 mph 0.00 in / hr 720 ft 2:54 AM CST Normal  
Wright City, MO 29.1 °F 29 °F 11 °F 47% SE  at  0.0 mph 0.00 in / hr 868 ft 2:44 AM CST Normal  
Whispering Hills, Creve Coeur, MO 31.7 °F 32 °F 12 °F 43% SE  at  1.0 mph 0.00 in / hr 530 ft 2:58 AM CST Rapid Fire
HADS CUIVRE RIVER NEAR TROY 2N MO, Troy, MO - - - - North  at  - 0.00 in / hr 520 ft 2:30 AM CST MADIS
HADS MISSISSIPPI RIVER AT POOL 26 NEA IL, Grafton, IL - - - - North  at  - 0.00 in / hr 430 ft 2:30 AM CST MADIS
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Winter Weather Advisory
Mobile & Email Alerts Statement as of 3:02 PM CST on February 12, 2012

... Winter Weather Advisory in effect from 9 am Monday to midnight
CST Monday night...

The National Weather Service in St Louis has issued a Winter
Weather Advisory for snow... which is in effect from 9 am Monday
to midnight CST Monday night.

* Timing... snow will begin during the mid-morning hours and
persist through much of the evening on Monday. The heaviest
snowfall is expected to occur during the late afternoon and
early evening hours.

* Accumulations... snowfall accumulations of 2 to 4 inches are
anticipated.

* Winds... southerly winds at 10 to 15 mph with gusts to around 20 mph.

* Impacts... the heaviest snowfall is expected to occur during the
afternoon and evening commute resulting in hazardous driving
conditions.

Precautionary/preparedness actions...

A Winter Weather Advisory is issued for a variety of winter
weather conditions... such as snow... blowing snow... sleet... or
freezing drizzle and rain. It only takes a small amount of wintry
precipitation to make roads... bridges... sidewalks... and parking
lots icy and dangerous. It is often difficult to tell when ice
begins to form... so do not be caught off guard.