Illinois alerts

Hamilton County, Illinois weather alerts

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

Checked Sun, Sep 20, 2026, 3:21 PM CDT. Times are Central Daylight Time.

Hamilton County forecastLive radar here

Warnings on the map

Every watch, warning and advisory the National Weather Service has in force over Hamilton 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 Hamilton 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 Hamilton 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 3 hr 39 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 Hamilton County

In the past year the National Weather Service issued 97 alerts for Hamilton County, including 19 severe thunderstorm warnings, 5 extreme heat warnings, 2 tornado warnings and 1 extreme cold warning.

ProductIssuedMost recent
Severe Thunderstorm Warning19Aug 22, 2026
Extreme Heat Warning5Sep 1, 2026
Tornado Warning2Jun 21, 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
Tornado Watch10Jun 21, 2026
Severe Thunderstorm Watch8Jul 26, 2026
Flood Watch5Jul 9, 2026
Extreme Heat Watch2Sep 1, 2026
Freeze Watch1Nov 2, 2025
Winter Storm Watch1Jan 24, 2026
Dense Fog Advisory10Mar 6, 2026
Heat Advisory9Sep 15, 2026
Wind Advisory7Jun 17, 2026
Flood Advisory5Aug 17, 2026
Cold Weather Advisory3Jan 30, 2026
Frost Advisory2Oct 24, 2025
Lake Wind Advisory2May 4, 2026
Winter Weather Advisory1Dec 1, 2025

Warnings issued

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

The 40 most recent of 97.

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 Hamilton 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.