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FNUS22 KWNS 210641

Day 2 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
0140 AM CDT Mon Aug 21 2017

Valid 221200Z - 231200Z

Upper ridging will remain prominent over much of the western CONUS
on Day 2/Tuesday, while an upper low located off the coast of
southern/central CA moves little. Mid-level monsoonal-related
moisture will advance northward along the Sierras into the southern
Cascades and vicinity on the northern periphery of the upper low by
Tuesday afternoon.

...Portions of Northern CA into Southern/Central OR and Far
Northwestern NV...
Isolated to widely scattered thunderstorms should develop by Tuesday
afternoon and continue through at least the early evening hours
across portions of northern CA into southern/central OR.
Terrain-driven circulations will likely be the primary impetus for
convective initiation. Forecast precipitable water values around
0.7 to 1.0 inch and modest (~15-20 kt) mid-level southwesterly flow
along the Sierra/Cascade crest will likely allow a mix of wet/dry
thunderstorms. A dry antecedent low-level airmass coupled with
diurnal heating will act to lower RH values across this region,
which should limit the potential for wetting rainfall outside of the
heaviest thunderstorm cores. Fuels also remain generally dry to very
dry and receptive to large fire starts. Accordingly, an isolated dry
thunderstorm area has been introduced across northern CA into
southern/central OR and far northwestern NV.

..Gleason.. 08/21/2017

...Please see for graphic product...

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