


Fire Weather Outlook Discussion
Issued by NWS
Issued by NWS
319 FNUS21 KWNS 011644 FWDDY1 Day 1 Fire Weather Outlook NWS Storm Prediction Center Norman OK 1143 AM CDT Fri Aug 01 2025 Valid 011700Z - 021200Z Hot, very dry (minimum RH values less than 10%), and breezy (sustained surface winds of 15-20 mph) conditions are expected today across much of the central/southern Great Basin and neighboring portions of northwest Colorado and southwest Wyoming. As of 16Z, observations across this area suggest locally elevated conditions already ongoing with critical RH values present. Widespread elevated conditions are expected from midday through this evening as winds strengthen and RH values fall even further. The Elevated fire weather area was expanded across this region based on the latest high-resolution ensemble guidance. Elevated fire weather conditions are also likely across wind-prone portions of the Snake River Plain in Idaho, where several hours of sustained winds of 15-20 mph (with greater gusts) and minimum RH values near 15% are expected this afternoon/evening. Locally critical fire weather conditions are most likely across portions of southwest Utah, northwest Colorado into southwest Wyoming, and also the Snake River Plain. Though, coverage is forecast to be too spotty/brief to upgrade to Critical across these areas. The forecast for isolated dry thunderstorms over portions of the northern Great Basin/Intermountain West remains on-track. Gusty and erratic outflow winds will be possible nearby any thunderstorms. Please see the previous discussion for more information on today`s fire weather forecast. ..Elliott.. 08/01/2025 .PREV DISCUSSION... /ISSUED 0155 AM CDT Fri Aug 01 2025/ ...Synopsis... Between a large-scale ridge centered on the Southwest/northern Mexico and a broad/slow-moving midlevel trough crossing northern CA, enhanced west-southwesterly midlevel flow will overspread the southern Great Basin. Deep boundary-layer mixing into this enhanced flow aloft will yield hot, dry, and breezy conditions during the afternoon. Given receptive fuels, elevated fire-weather conditions are expected across southern NV into southern UT. Farther north, cool temperatures aloft/steep midlevel lapse rates accompanying the trough will promote another day of isolated to widely scattered high-based thunderstorms across the northern Great Basin/Intermountain West. Inverted-V profiles and 0.6-0.7 inch PW will favor mostly dry thunderstorms, with a risk of lightning-induced ignitions over receptive fuels. ...Please see www.spc.noaa.gov/fire for graphic product... $$