Johnson County, IL — Severe Weather & Radar
No active severe-weather warnings for Johnson County, IL right now. Live radar is below — set up alerts to get warned the moment one is issued.
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Severe-weather outlook
General (non-severe) thunderstorms are possible in Johnson County, ILtoday, per the Storm Prediction Center's Day 1 outlook.
3-day forecast
Forecast via Open-Meteo.
When is severe weather most likely near Johnson?
Around Johnson County and the Midwest, severe weather is most active from April through June.
The main threats are damaging thunderstorm winds — including widespread, long-lived derechos — along with large hail and tornadoes.
Based on long-term NOAA / NWS Storm Prediction Center climatology.
In Johnson County, IL
Johnson County, IL has an estimated 13,000 residents, plus 1 nursing homes, 7 schools that could be in a storm's path. Atmostorm shows which of them fall inside an active warning polygon.
Emergency-management view: who & what is in the warned path →
Nearby areas
Live radar and active alerts for places near Johnson:
Not an official source — always confirm with the National Weather Service at weather.gov. Data aggregated from NWS/SPC. Facility and population figures are decision-support estimates.