National Weather Service United States Department of Commerce

Fire
Weather

Flooding/
Hydrology

 

Severe
Weather

Tropical
Weather

Winter
Weather

 

Spot Fire Weather Forecast Request

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Red Flag
 Criteria

 

    RH

    Rainfall

    Wind

    Fuel

Temperature

   Vegetation Stage I or II
cured/transition - Spring/Fall

 

less than 30%

less than 1/4 inch in previous 5 days

sustained or frequent gusts above 25 mph

N/A

greater than 50 degrees F

Vegetation Stage III
   green - Summer

 

less than 30%

less than 1/4 inch in previous 8 days

sustained or frequent gusts above 25 mph

Keetch-Byram Drought Index above 300

greater than 50 degrees F

 

Fire Weather Watch is issued up to 72 hours in advance of expected onset of red flag criteria

 

Red Flag Warning is issued when red flag criteria will occur in 24 hours or less

 

Special Weather Statement is issued when Red Flag criteria are met, however temperatures are below 50F, or to raise elevated fire awareness

 

Local Products & Resources

 

Weather Hazards MapHazards Assessment

Weather Hazards

Map displays active watch, warnings, advisories and short term forecasts in the lower 48 states. Map automatically refreshes every five minutes.

Loop of sea-level pressures and fronts through day 7

Surface Analysis

The Weather Prediction Center (WPC) produces surface maps which depicts the analysis of  highs, lows, fronts, troughs, outflow boundaries, squall lines, and drylines.

Regional Observations
 

Storm Prediction Center Fire Outlook Day 1
Day 1 Fire Weather Discussion

Day 1 Outlook

The Day 1 Outlook covers the 24-hour period from 12Z on the morning of product issuance to 12Z the following morning, with the update covering the 19-hour period from 17Z at issuance to 12Z the following morning.

Storm Prediction Center Fire Outlook Day 2Day 2 Fire Weather Discussion

Day 2 Outlook

The Day 2 Outlook covers the following 24-hour period after Day 1 out to 48 hours. The Day 2 Fire Weather Outlook is scheduled for issuance at 10Z and is updated at 20Z.

Storm Prediction Center Fire Outlook Days 3-8Day 3-8 Fire Wx Discussion

Day 3-8 Outlook

The Day 3-8 Outlook covers the period of 48 to 192 hours from 12Z on the morning of product issuance. The Day 3-8 Fire Weather Outlook is scheduled for issuance at 22Z.

Short Range Ensemble Forecast (SREF) Products
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Short-Range Ensemble Forecast (SREF)

Short-Range Ensemble Forecast  is produced by postprocessing the 21 members NCEP SREF plus the operational WRF-NAM for a total of 22 members. Special emphasis is placed on high-impact, mesoscale guidance including fire weather.

Send questions/comments to Hugh Johnson  and  Ian Lee Fire Weather Program Leaders