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Fire-weather alerts

Red Flag warnings

Red Flag warnings and Fire Weather Watches are issued by the National Weather Service when conditions are critical for rapid wildfire growth — typically a combination of low humidity, high temperatures, dry fuels, and strong winds. For warnings in effect now, see weather.gov or the NOAA Storm Prediction Center's fire-weather outlooks; FireVerge does not show live alerts yet.

01 What triggers a warning

Red Flag criteria

Each NWS forecast office sets its own thresholds. Common triggers across the western US:

  • Relative humidity below ~15–25% (depends on region).
  • Sustained winds ≥15–25 mph or gusts ≥25–35 mph.
  • Fuel moisture at or below critical levels (10-hour fuel moisture ≤8%).
  • Temperatures well above seasonal normal, often paired with drought.
  • Dry lightning forecast over receptive fuels.
02 By state

Top 25 states by wildland fire activity

A proxy for where Red Flag warnings tend to bite hardest. Click for the full state profile.

#State2025 wildland firesActive fires
1 California 24,762 66
2 Texas 21,355 12
3 Florida 10,999 5
4 South Carolina 9,955 0
5 Illinois 9,575 0
6 Washington 9,317 24
7 North Carolina 9,296 3
8 Mississippi 8,227 3
9 Tennessee 7,388 0
10 Missouri 7,293 0
11 Pennsylvania 6,805 0
12 Oklahoma 6,587 26
13 Alabama 6,200 4
14 Ohio 5,767 0
15 Virginia 5,713 0
16 Arkansas 5,681 3
17 Oregon 5,435 60
18 Iowa 5,225 0
19 Massachusetts 5,157 1
20 Michigan 4,926 3
21 Colorado 4,663 12
22 Louisiana 4,548 5
23 Kansas 4,143 0
24 Wisconsin 4,003 11
25 New Jersey 3,904 0

About Red Flag data

Red Flag warnings and Fire Weather Watches are issued by local National Weather Service forecast offices and published at weather.gov. FireVerge does not show live alerts yet; the state table ranks states by NFIRS wildland-fire counts and the latest NIFC active-fire snapshot.