East Alton, IL Weather Forecast
Madison County, Illinois
Seven-day outlook
56–91°F across the weekForecasts come from the National Weather Service's own computer models, and current conditions from the nearest reporting weather station. Both are served through the weather API. A forecast is guidance, not a warning, and anything the Weather Service has actually issued is on the live map.
About the East Alton forecast
East Alton sits at 38.8841°N, 90.1079°W in Madison County, Illinois. The forecast above is drawn for that point from the National Weather Service's own computer models: a seven-day outlook, and a finer-grained one covering the next eighteen hours where it reaches, and the radar and alert panels show what the Weather Service has out over the area right now.
- County
- Madison County
- Coordinates
- 38.8841°N, 90.1079°W
- Population
- 5,639 · 2023 estimate
- Land area
- 5.318 sq mi
Place data from the US Census Bureau. Coordinates are the Census internal point for East Alton, and the forecast is for that location, not for every address inside the city limits, and a large city can have real weather differences from one side to the other.
How well can the network see East Alton?
The nearest Doppler radar is KLSX (St. Louis, MO), 33 miles to the WSW. A WSR-88D's lowest routine scan sits half a degree above horizontal, and the earth curves away beneath it, so by the time that beam reaches East Alton its center is about 2,100 ft above ground. That is comfortably inside the useful range. The lowest scan passes low enough over East Alton to show rotation in the part of a storm where tornadoes actually form. East Alton is closer to its radar than 65% of US cities.
The closest instrument actually measuring the air is KALN · Alton/St Louis Rgnl on the ASOS/AWOS network, 4.1 miles away. Close enough that its readings are, for practical purposes, the conditions in town.
Beam height is the standard 4/3-earth approximation for the 0.5° scan and assumes normal refraction; it is where the center of the beam is, not its edges, and unusual temperature profiles bend it. Radar siting from the NWS WSR-88D network, station positions from the Illinois observing network as of this build.
Forecasts near East Alton
- Wood River, IL2 mi
- Alton, IL3 mi
- Bethalto, IL4 mi
- Godfrey, IL8 mi
- Edwardsville, IL9 mi
- Black Jack, MO10 mi
- Granite City, IL11 mi
- Glen Carbon, IL11 mi
Elsewhere in Illinois
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