National Weather Service United States Department of Commerce

Heat Persists in the Southwest; Elevated to Critical Fire Weather in the Great Basin; Poor Air Quality in the West

Dangerous heat will persist across the Southwest U.S. through this week, easing by next week. The heat will focus further east in the Great Plains and Mississippi Valley beginning next week. Elevated to locally critical fire weather conditions will persist for the Great Basin today. Poor air quality lingers for the Northwest, Great Basin, Central Rockies into the Plains. Read More >

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Last Map Update: Tue, Aug 4, 2026 at 12:16:31 pm PDT

Critical fire weather conditions are expected today and Wednesday due to low RHs during the afternoons, and east winds with poor recoveries over the mountains during the overnight periods. This combination of gusty winds and very low humidities could result in the rapid spread of new or existing fires. Do your part to prevent a spark…one less spark, one less fire!
Temperatures will push into the triple digits for many valleys west of the Cascades near the California and Oregon border. Warmer overnight lows and hot afternoon temperatures for multiple days will bring us moderate heat risk. We're also forecasting a record high of 106 in Medford on Wednesday August 5th.
A look at the forecast high temperatures compared to current records this week.

 

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