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Aug 21, 2017 Day 2 Fire Weather Outlook
Updated: Mon Aug 21 06:43:03 UTC 2017 (Print Version | 20170821 1200Z Day 2 FireWX shapefile | 20170821 1200Z Day 2 FireWX KML)
Day 2 Fire
 Population  Cities/Towns  CWAs  Interstates  Counties  FEMA Regions  Day 2 Surface Analysis

Risk Area (sq. mi.) Area Pop. Some Larger Population Centers in Risk Area
No Risk Areas Forecast
   FNUS22 KWNS 210640

   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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