Fire Weather Outlook Discussion
Issued by NWS
Issued by NWS
669 FNUS22 KWNS 190710 FWDDY2 Day 2 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0209 AM CDT Thu Jun 19 2025 Valid 201200Z - 211200Z ...CRITICAL FIRE WEATHER AREA FOR MUCH OF THE GREAT BASIN INTO THE SOUTHWEST... ...Synopsis... A robust midlevel low will advance eastward across the Northwest during the day, while a swath of strong deep-layer westerly flow overspreads much of the western CONUS. In response, surface low pressure will deepen over the northern Great Basin, promoting a tightening pressure gradient across the Great Basin into the Southwest. This large-scale pattern will support widespread critical fire-weather conditions across the Great Basin into the Southwest. ...Great Basin into the Southwest... Strong diurnal heating amid a dry antecedent air mass will support another day of widespread single-digit RH across the region. At the same time, deep boundary-layer mixing into the strong flow aloft, combined with the tightening pressure gradient, will yield an expansive area of 20-30 mph sustained southwesterly surface winds. Given increasingly dry fuels across much of the Great Basin into the Southwest, widespread critical fire-weather conditions are expected, with localized extremely critical conditions possible over terrain-favored areas. ...Southern CA into the San Joaquin Valley... Deep-layer west-northwesterly flow on the upstream-side of the midlevel low will overspread central and southern CA, where the tight regional pressure gradient will be in place. This will promote breezy/gusty surface winds primarily over the interior mountains and valley -- where 15-20 percent RH is expected. These dry/breezy conditions will favor elevated fire-weather conditions where fuels are receptive to wildfire spread. ..Weinman.. 06/19/2025 ...Please see www.spc.noaa.gov/fire for graphic product... $$