Fire Weather Outlook Discussion
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FNUS21 KWNS 200603
FWDDY1

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...

$$


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