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What are the sources for WeatherOnline forecasts?


The WeatherOnline forecasts are created by using a MOS system developed in-house with the most current US weather services model data (GFS). The statistical methods of the Model-Output-Statistic (MOS)-System were developed in cooperation with the Meteorological Department of the University of Bonn.

What is a MOS-System?


A Model-Output-Statistic (MOS)-System combines the data of the weather forecast model and the locally recorded data for any given point by transforming the model data from a coarse grid to detailed small scale areas.
In order to do so, one needs a large volume of past model forecast data as well as the corresponding recorded data for any given location. The MOS-System relates these two sets of data in an optimized fashion allowing development of the local weather forecast by using the most current model forecast.

What are the time intervals used in the temperature and icons of the local forecasts?


The forecasted maximum temperature always refers to a 12hour window from 6am to 6om local time.
The forecasted minimum temperature always refers to the 12hour window from 6pm of the day before the forecast day to 6 am of the forecast day.
The weather icon for the morning refers to the time between 6am and 12pm local time, the icon for the afternoon is valid from 12am to 6pm local time and the evening icon refers to the time from 6pm to 12am local time.

How often are the current weather conditions and forecasts updated?


The current weather information as well as the satellite images are updated every 30 minutes whereas the radar images are being updated every 15 minutes.
The local weather forecasts as well as the weather charts are updated 8 times a day. The updates start at 2 am CEST or 3 am CEST depending on daylight saving time and continue on a three hourly bases.


Estações Meteorológicas Próximas - O'Fallon Distância
Dubuque Regional Airport 4.9 km
Spirit of St. Louis Airport 4.9 km
Macomb Municipal Airport 5.8 km
Corning Aeroporto 6.6 km
Jonesboro Municipal Airport 6.8 km
Pittsfield 9.4 km
Davenport Municipal Airport 13.5 km
Quad Cities Intl. Airport 20.6 km
Fletcher Field 21.5 km
Walnut Ridge Regional Airport 24.5 km
Poplar Bluff(Amos) 26.1 km
Aeroporto Municipal de Platteville 29.1 km
Farmington Aeroporto 29.7 km
Galesburg Municipal Airport 30.0 km
St. Charles 31.5 km
Washington Aeroporto 32.7 km
Aeroporto Internacional de Lambert 37.1 km
Tunica Municipal Airport 39.5 km
Clinton Municipal Airport 40.9 km
Southeast Iowa Regional Airport 46.5 km
Muscatine Municipal Airport 49.2 km
Jacksonville Aeroporto 51.0 km
Mineral Point 52.0 km
Newport 53.0 km
Quincy Regional Airport 55.7 km
W Memphis Municipal 59.7 km
St. Louis Downtown Airport 61.2 km
Savanna Aeroporto 65.7 km
Fort Madison 70.6 km
St. Louis Regional Airport 74.4 km
Memphis Aeroporto 77.9 km
Keokuk Municipal Airport 81.7 km
Hannibal Regional Airport 82.8 km
Arkansas Intl. Airport 83.5 km
Mount Pleasant Municipal Airport 90.4 km
Millington-Memphis Airport 92.7 km
Iowa City Municipal Airport 94.0 km
MidAmerica St. Louis Airport 94.6 km
Stuttgart Municipal Airport 96.8 km
Blytheville Municipal Airport 98.3 km
Olive Branch Aeroporto 101.6 km
Batesville Aeroporto 105.9 km
Washington 107.7 km
Sparta 111.3 km
Peoria Aeroporto 113.2 km
Eastern Iowa Airport 113.4 km
Rock Falls Aeroporto 113.9 km
Litchfield Municipal Airport 114.2 km
Abraham Lincoln Capital Airport 115.0 km
Searcy Municipal Airport 115.7 km
Rolla National Airport 118.7 km
Monroe Municipal Airport 124.2 km
Freeport Aeroporto 124.5 km
Cape Girardeau Regional Airport 126.2 km
Sikeston Aeroporto 127.1 km
University-Oxford Airport 129.4 km
West Plains Regional Airport 133.6 km
Grider Field 137.7 km
Independence Municipal Airport 139.1 km
Oelwen 141.3 km
Fairfield Municipal Airport 143.0 km
Dyersburg Regional Airport 144.7 km
Lacon Aeroporto 146.0 km
Vinton Aeroporto 147.8 km
Logan County Airport 151.5 km
Taylorville Aeroporto 152.6 km
Waynesville-St. Robert Regional Airport 159.6 km
Southern Illinois Airport 161.4 km
Jefferson 161.4 km
Little Rock Air Force Base 161.7 km
Cairo Aeroporto 164.8 km
Columbia Regional Airport 168.8 km
Aeroporto Nacional Clinton 171.3 km
Illinois Valley Regional Airport 172.5 km
Rockford Aeroporto 178.0 km
Centralia 178.1 km
Rochelle Municipal Airport 180.1 km
Southern Wisconsin Regional Airport 185.4 km
Veterans Airport of Southern Illinois 187.4 km
Waterloo Regional Airport 189.5 km
Everett- Stewart Regional Airport 190.8 km
Salem-Leckrone 193.0 km
Ottumwa Regional Airport 194.9 km
Clinton Aeroporto 195.2 km
Ozark Regional Airport 196.8 km
Marion 196.8 km
McKellar- Sipes Regional Airport 198.4 km
Central Illinois Regional Airport 198.5 km
Oskaloosa Aeroporto 199.8 km
Decatur Airport 204.1 km
Mount Vernon Airport 204.1 km
Lee C. Fine Memorial Airport 205.9 km
Kirksville Regional Airport 206.0 km
Tupelo Regional Airport 215.1 km
Barkley Regional Airport 215.2 km
Metropolis Municipal Airport 217.2 km
DeKalb Aeroporto 221.8 km
Grinnell Aeroporto 226.5 km
Pontiac Aeroporto 231.4 km
Roscoe Turner Airport 233.3 km