Fire Weather Outlook Discussion
Issued by NWS
Issued by NWS
783 FNUS21 KWNS 141649 FWDDY1 Day 1 Fire Weather Outlook NWS Storm Prediction Center Norman OK 1148 AM CDT Mon Jul 14 2025 Valid 141700Z - 151200Z ...CRITICAL FIRE WEATHER AREA FOR CENTRAL WASHINGTON... ...Central/Northeastern Utah and Northwestern Colorado... A weak upper-level wave evident in water vapor imagery will move through northern Utah today. Slightly increased mid-level flow on the southern periphery of the wave will support enhanced dry downslope flow into the Uinta Basin and along and east of the central Utah mountain chain. Sustained winds of 10-15 mph along with 10-15 percent relative humidity will result in a period of elevated fire weather conditions over dry fuels where ERC values are around the 97th percentile. Otherwise, no major changes to previous forecast (see below) for the Northwest, Great Basin or Snake River Plain highlights. ..Williams.. 07/14/2025 .PREV DISCUSSION... /ISSUED 0138 AM CDT Mon Jul 14 2025/ ...Synopsis... A mid-level trough will bring a belt of enhanced westerly flow aloft across portions of the Pacific Northwest today. A period of Elevated to Critical fire weather conditions can be expected across the Columbia River Basin in Oregon and Washington and in the Snake River Plain in Idaho. The trough will also promote dry thunderstorm development across the Great Basin. ...Cascades and Columbia River Basin... Relative humidity reductions to 15-20 percent will combine with west winds around 15 mph promoting elevated fire weather concerns for the Columbia River Basin through Monday afternoon. A considerable wind shift is expected with the dry cold front passage beginning early afternoon across the Okanagan Valley before reaching the Columbia River by evening. Although relative humidity will rise behind the front, a few hours of sustained north winds of 20-30 mph will create Critical fire weather concerns and could significantly impact existing active or new fires Monday. ...Snake River Plain... Relative humidity reductions to 15-20 percent will combine with westerly winds around 10-15 mph (locally higher) through Monday afternoon. Locally stronger winds may bring near Critical to Critical conditions, however the localized nature precludes inclusion of a Critical area at this time. ...Dry Thunderstorms... Forcing for ascent with the upper-level trough will allow for high based convection to develop across portions of the northern Great Basin. Primarily mid-level moisture will overspread a very dry and warm boundary layer, with little to no precipitation and storm motions around 10-20 mph. This in combination with critical fuels supports maintaining and area of isolated dry thunderstorm chances across northern Nevada into southeastern Oregon, southern Idaho, and far northeastern Nevada. ...Please see www.spc.noaa.gov/fire for graphic product... $$