Montana alerts

Fallon County, Montana weather alerts

1 National Weather Service alert is in force for Fallon County: a flood watch.

Checked Sun, Sep 20, 2026, 5:33 PM MDT. Times are Mountain Daylight Time.

Fallon County forecastLive radar here

Warnings on the map

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

Every watch, warning and advisory the National Weather Service has in force over Fallon County, Montana 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 Fallon County, worst first, with its full text.

Flood Watch

Severe

Flood Watch issued September 20 at 1:56PM MDT until September 20 at 6:00PM MDT by NWS Billings MT

Issued Until 26 min left

Areas Musselshell, MT; Treasure, MT; Northern Rosebud, MT; Custer, MT; Fallon, MT; Powder River, MT; Carter, MT; Northern Big Horn, MT; Southern Rosebud, MT; Southern Big Horn, MT; Bighorn Canyon, MT; Pryor/Northern Bighorn Mountains, MT; Northeastern Yellowstone, MT; Southwestern Yellowstone, MT; Northeast Bighorn Mountains, WY; Sheridan Foothills, WY

Full text

Showers continue over southeast Montana and northern Wyoming today. A few thunderstorms may develop as well. The risk of flooding continues. * WHAT...Flooding caused by excessive rainfall is possible, along with flash flooding over recent burn scars. * WHERE...Southeast Montana and Sheridan County Wyoming. * WHEN...Until 6 PM MDT this evening. * IMPACTS...Excessive runoff may result in flooding of creeks and other low-lying and flood-prone locations. Flooding may occur in poor drainage and urban areas. The risk of flooding will diminish late this afternoon and evening as showers taper off. * ADDITIONAL DETAILS... - The heaviest rainfall is slowly shifting eastward to southeast Montana and northeast Wyoming. - The Elk and McGhee-Remington burn scars are particularly vulnerable to flash flooding and debris flows. Any other burn scars from this summer will have elevated flash flood potential as well. - http://www.weather.gov/safety/flood

What to do

Monitor the latest forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop.

NWS Billings MTShare this alert

The past year in Fallon County

In the past year the National Weather Service issued 74 alerts for Fallon County, including 13 severe thunderstorm warnings, 10 red flag warnings, 7 high wind warnings and 3 extreme heat warnings.

ProductIssuedMost recent
Severe Thunderstorm Warning13Sep 2, 2026
Red Flag Warning10Sep 10, 2026
High Wind Warning7Sep 14, 2026
Extreme Heat Warning3Aug 1, 2026
Winter Storm Warning2Apr 3, 2026
Severe Thunderstorm Watch9Aug 30, 2026
High Wind Watch5Mar 12, 2026
Fire Weather Watch4Sep 4, 2026
Extreme Heat Watch3Aug 1, 2026
Winter Storm Watch3Apr 3, 2026
Flood Watch1Sep 18, 2026
Winter Weather Advisory9Mar 14, 2026
Cold Weather Advisory3Jan 25, 2026
Dense Fog Advisory2Jan 3, 2026

Warnings issued

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

The 40 most recent of 74.

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 Fallon 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.