


Fire Weather Outlook Discussion
Issued by NWS
Issued by NWS
991 FNUS21 KWNS 080652 FWDDY1 Day 1 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0152 AM CDT Tue Jul 08 2025 Valid 081200Z - 091200Z ...Synopsis... Along the northwestern periphery of an expansive midlevel ridge over the Southwest, a midlevel low will approach the northern CA coast as it gradually phases with a robust midlevel trough moving across British Columbia. Large-scale ascent preceding the midlevel low will promote isolated dry/high-based thunderstorms over the higher terrain of OR into far southeastern WA. Given dry/receptive fuels and limited rainfall with these storms, lightning-induced ignitions will be possible, along with strong convective outflow. Additionally, strong deep-layer westerly flow in the base of the midlevel trough moving across British Columbia will overspread the Cascades, resulting in dry/breezy downslope flow and elevated fire-weather conditions in the Columbia Basin. Farther south, a belt of enhanced midlevel southwesterly flow will overspread the Great Basin between the large-scale ridge and midlevel low. Deep boundary-layer mixing into this enhanced flow aloft will favor dry/breezy conditions over central NV into western UT, and given dry fuels, elevated fire-weather conditions are expected. ..Weinman.. 07/08/2025 ...Please see www.spc.noaa.gov/fire for graphic product... $$