SPC Day 1 Fire Weather Outlook

By Newsroom America Feeds at 20 Aug 2017

SPC Day 1 Fire Weather Outlook
Day 1 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0102 AM CDT Sun Aug 20 2017 Valid 201200Z - 211200Z ...Synopsis... A large-scale trough will continue moving eastward across central Canada today, with a belt of enhanced mid-level westerly winds remaining confined to the north-central CONUS. An upper ridge is forecast to begin amplifying over the eastern Pacific and western CONUS, while a weak upper low remains just off the coast of southern CA. At the surface, a cold front will advance eastward across the northern Plains and Upper Midwest, with its trailing portion becoming stationary and increasingly ill-defined across the northern High Plains into the northern Rockies/Great Basin. ...Portions of the Northern Great Basin into the Northern/Central Rockies... Although the strongest mid-level flow will remain displaced to the north of this region, around 20-25 kt of westerlies at 500 mb will likely reach the surface as the boundary layer warms/mixes by this afternoon and early evening. Localized enhancement to the low-level west-southwesterly flow appears likely across eastern portions of the Snake River Valley into western WY, where sustained winds of 15-20 mph should occur. Some stronger gusts will be possible, especially at higher elevations. RH values will once again become lowered into the 10-15% range across much of this region as both the low-level airmass and available fuels remain quite dry. These expected meteorological and fuel conditions support the continuation of an elevated area across southern ID into western WY. Locally critical conditions may occur where winds exceed 20 mph, but this is currently expected on just a brief and spotty basis, precluding critical designation. ..Gleason.. 08/20/2017 ...Please see www.spc.noaa.gov/fire for graphic product... Read more



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