Day 1 Fire Weather Outlook NWS Storm Prediction Center Norman OK 1232 AM CDT Sun Aug 30 2020 Valid 301200Z - 311200Z ...Synopsis... A large-scale trough will enter portions of the Pacific Northwest and traverse the northern Rockies into the northern Plains. A broad region of modestly enhanced mid-level flow will accompany this trough progression, particularly along the base of the trough where 55-65 kt mid-level flow will be present. At the surface, a Pacific cold front will sweep across the northern Rockies into the northern Plains. ...Northern Great Basin and Central Rockies... A relatively dry airmass, in concert with diurnal heating and mixing of the modest mid-level flow, should result in a period of elevated fire-weather conditions over a relatively broad region during the afternoon. Most of the ongoing elevated area has been maintained, collocated with the southern periphery of enhanced mid-level flow and supportive underlying fuels. A corridor of enhanced surfaced winds (sustained winds near 20 mph, gusts near 30 mph) and dry conditions (RH into the teens) should develop along portions of southern Wyoming into the western Nebraska Panhandle and northeast Colorado, where timing of the enhanced mid-level flow will align with peak heating. This will yield at least locally critical fire-weather conditions, particularly along/east of the Front Range with downsloping winds. However, precipitation from the prior evening over expansive portions of the region remains a limiting factor, and thus, the elevated delineation has been maintained at this time, with a minor expansion made into portions of northeast Colorado based on available high-resolution guidance. ...Southwest Oregon and Northwest California... High pressure will settle into portions of the Pacific Northwest behind the aforementioned cold front. The resulting surface pressure gradient will favor a period of northeasterly offshore flow Sunday afternoon/evening. Sustained winds of 20-25 mph, with gusts in excess of 30 mph are possible, particularly in terrain-favored locations, in concert with RH approaching the upper teens and fuels conducive for large-fire spread. ..Karstens.. 08/30/2020 ...Please see www.spc.noaa.gov/fire for graphic product...Read more
from SPC Forecast Products http://www.spc.noaa.gov/products/fire_wx/fwdy1.html
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