Illinois alerts

Union County, Illinois weather alerts

1 National Weather Service alert is in force for Union County: a heat advisory.

Checked Sun, Sep 20, 2026, 5:19 PM CDT. Times are Central Daylight Time.

Union County forecastLive radar here

Warnings on the map

Every watch, warning and advisory the National Weather Service has in force over Union County, Illinois. Open it for the live map, where it pans and zooms.

Every watch, warning and advisory the National Weather Service has in force over Union County, Illinois Open the live map with warnings and watches

Map layer from NOAA National Weather Service. Boundaries from the Iowa Environmental Mesonet.

Alerts in force1

Every product in force for Union County, worst first, with its full text.

Heat Advisory

Moderate

Heat Advisory issued September 20 at 4:20AM CDT until September 20 at 7:00PM CDT by NWS Paducah KY

Issued Until 1 hr 40 min left

Areas Jefferson, IL; Wayne, IL; Edwards, IL; Wabash, IL; Perry, IL; Franklin, IL; Hamilton, IL; White, IL; Jackson, IL; Williamson, IL; Saline, IL; Gallatin, IL; Union, IL; Johnson, IL; Pope, IL; Hardin, IL; Alexander, IL; Pulaski, IL; Massac, IL; Gibson, IN; Pike, IN; Posey, IN; Vanderburgh, IN; Warrick, IN; Spencer, IN; Fulton, KY; Hickman, KY; Carlisle, KY; Ballard, KY; McCracken, KY; Graves, KY; Livingston, KY; Marshall, KY; Calloway, KY; Crittenden, KY; Lyon, KY; Trigg, KY; Caldwell, KY; Union, KY; Webster, KY; Hopkins, KY; Christian, KY; Henderson, KY; Daviess, KY; McLean, KY; Muhlenberg, KY; Todd, KY; Perry, MO; Bollinger, MO; Cape Girardeau, MO; Wayne, MO; Carter, MO; Ripley, MO; Butler, MO; Stoddard, MO; Scott, MO; Mississippi, MO; New Madrid, MO

Full text

* WHAT...Heat index values up to 102 degrees are expected. * WHERE...all of southern Illinois, southwest Indiana, western Kentucky, and southeast Missouri. * WHEN...Until 7 PM CDT /8 PM EDT/ this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

What to do

Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke.

NWS Paducah KYShare this alert

The past year in Union County

In the past year the National Weather Service issued 108 alerts for Union County, including 19 severe thunderstorm warnings, 7 flash flood warnings, 5 extreme heat warnings and 5 flood warnings.

ProductIssuedMost recent
Severe Thunderstorm Warning19Aug 19, 2026
Flash Flood Warning7Jul 11, 2026
Extreme Heat Warning5Sep 1, 2026
Flood Warning5Jul 11, 2026
Tornado Warning3Mar 15, 2026
Extreme Cold Warning1Jan 26, 2026
Freeze Warning1Mar 28, 2026
High Wind Warning1Mar 15, 2026
Red Flag Warning1Mar 29, 2026
Winter Storm Warning1Jan 24, 2026
Severe Thunderstorm Watch9Aug 19, 2026
Flood Watch5Aug 19, 2026
Tornado Watch5Jun 26, 2026
Extreme Heat Watch2Sep 1, 2026
Freeze Watch1Nov 2, 2025
Winter Storm Watch1Jan 24, 2026
Dense Fog Advisory12Feb 15, 2026
Heat Advisory10Sep 15, 2026
Wind Advisory8Jun 17, 2026
Cold Weather Advisory3Jan 30, 2026
Flood Advisory3Jul 10, 2026
Lake Wind Advisory2May 4, 2026
Winter Weather Advisory2Jan 21, 2026
Frost Advisory1Oct 24, 2025

Warnings issued

  1. Extreme Heat Warning
  2. Severe Thunderstorm Warning
  3. Severe Thunderstorm Warning
  4. Severe Thunderstorm Warning
  5. Extreme Heat Warning
  6. Extreme Heat Warning
  7. Extreme Heat Warning
  8. Flood Warning
  9. Flood Warning
  10. Flash Flood Warning
  11. Flash Flood Warning
  12. Flash Flood Warning
  13. Severe Thunderstorm Warning
  14. Severe Thunderstorm Warning
  15. Extreme Heat Warning
  16. Severe Thunderstorm Warning
  17. Severe Thunderstorm Warning
  18. Flash Flood Warning
  19. Severe Thunderstorm Warning
  20. Flash Flood Warning
  21. Severe Thunderstorm Warning
  22. Flood Warning
  23. Severe Thunderstorm Warning
  24. Flash Flood Warning
  25. Severe Thunderstorm Warning
  26. Flood Warning
  27. Severe Thunderstorm Warning
  28. Severe Thunderstorm Warning
  29. Severe Thunderstorm Warning
  30. Severe Thunderstorm Warning
  31. Red Flag Warning
  32. Freeze Warning
  33. Tornado Warning
  34. Tornado Warning
  35. Severe Thunderstorm Warning
  36. Tornado Warning
  37. High Wind Warning
  38. Flood Warning
  39. Flash Flood Warning
  40. Extreme Cold Warning
  41. Winter Storm Warning
  42. Severe Thunderstorm Warning
  43. Severe Thunderstorm Warning
  44. Severe Thunderstorm Warning
Every alert, most recent first
  1. Heat Advisory
  2. Heat Advisory
  3. Extreme Heat Warning
  4. Extreme Heat Watch
  5. Heat Advisory
  6. Severe Thunderstorm Warning
  7. Severe Thunderstorm Warning
  8. Severe Thunderstorm Warning
  9. Severe Thunderstorm Watch
  10. Flood Watch
  11. Extreme Heat Warning
  12. Heat Advisory
  13. Heat Advisory
  14. Heat Advisory
  15. Extreme Heat Warning
  16. Severe Thunderstorm Watch
  17. Extreme Heat Warning
  18. Heat Advisory
  19. Flood Warning
  20. Flood Warning
  21. Flash Flood Warning
  22. Flash Flood Warning
  23. Flood Advisory
  24. Severe Thunderstorm Watch
  25. Flood Advisory
  26. Flash Flood Warning
  27. Severe Thunderstorm Watch
  28. Flood Watch
  29. Severe Thunderstorm Warning
  30. Flood Advisory
  31. Severe Thunderstorm Warning
  32. Heat Advisory
  33. Extreme Heat Warning
  34. Extreme Heat Watch
  35. Heat Advisory
  36. Severe Thunderstorm Warning
  37. Severe Thunderstorm Watch
  38. Severe Thunderstorm Warning
  39. Flash Flood Warning
  40. Severe Thunderstorm Warning

The 40 most recent of 108.

From the Iowa Environmental Mesonet’s archive of NWS watches, warnings and advisories (VTEC), by the county’s own code and the forecast zones inside it. Each date links to the event at the IEM.

Nearby

The counties around Union County, with what is in force in each.

What this means

Warning
The hazard is happening or about to. Act now: a tornado warning means take shelter, a flash flood warning means move to higher ground.
Watch
Conditions favor the hazard. Nothing is happening yet; have a plan and be ready to act if a warning follows.
Advisory
A hazard that is less serious than a warning but can still cause trouble, such as dense fog, heat or light ice.
Statement
Information about weather that does not yet meet a warning: a strong storm, a hydrologic update, or a special weather statement.

Severity (extreme, severe, moderate, minor) is the rating the issuing office gives each product. More on the difference: tornado watch vs. tornado warning. Alerts come from the National Weather Service; follow its instructions and your local officials.

Sources

Alerts from the National Weather Service's public feed, read afresh every minute, and matched to counties and zones by their UGC codes. Warnings from outside the United States come from each country's own meteorological service. Follow the issuing office's instructions and your local officials.