Live National Weather Service alerts, NEXRAD weather radar, USGS river and stream gauges, Storm Prediction Center convective outlooks, Local Storm Reports, 5-day forecast, air quality, and severe-weather notifications for Williamson County, IL (FIPS 17199) in Illinois. Free, no login, no ads.
Williamson County, IL is one of the counties of Illinois covered by BloomWX. Williamson County, IL has a population of approximately 67,120 (2022 estimate, US Census Bureau). The county covers 420.2 square miles of land area. The county seat is Marion.
Marion, Herrin, Carterville, Johnston City, Crainville.
Williamson County, IL is served by the National Weather Service PAH forecast office for warnings, watches, advisories, and decision-support services. The same office produces the Hazardous Weather Outlook, Area Forecast Discussion, and DSS briefing packets you'll see on the BloomWX dashboard for this county.
BloomWX also covers the surrounding counties: Franklin County, IL, Jackson County, IL, Saline County, IL, Union County, IL, Johnson County, IL, Pope County, IL.
BloomWX is a free weather operations dashboard for SKYWARN storm spotters, emergency management volunteers, ham radio nets, and anyone in Williamson County, IL who needs the official NWS data without the consumer-app cruft. Data is pulled directly from weather.gov and refreshes every 60 seconds. Sources: National Weather Service, Storm Prediction Center, USGS Water Data, NOAA Space Weather Prediction Center, Open-Meteo (Air Quality), and the Citizen Weather Observer Program.
Read the BloomWX learn library for beginner-friendly explainers on every dashboard surface, including SPC convective outlooks (TSTM/MRGL/SLGT/ENH/MDT/HIGH), NEXRAD radar, USGS flood gauges, and WPC surface analysis charts. See all Illinois county weather dashboards on BloomWX.