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Current Fire Watches and Warnings
   FNUS21 KWNS 200757

   Day 1 Fire Weather Outlook  
   NWS Storm Prediction Center Norman OK
   0257 AM CDT Fri Oct 20 2017

   Valid 201200Z - 211200Z

   A powerful long-wave trough will migrate eastward across the
   Intermountain West today while spreading strong mid-level flow from
   California to the Four Corners region and northeastward into the
   northern High Plains.  At the surface, a north-south oriented trough
   will sharpen across the northern High Plains while shifting eastward
   into the Dakotas.  Downslope flow west of this trough will enhance
   fire weather concerns.  Farther west, a stout area of high pressure
   will build into the western Great Basin and foster a favorable
   pressure gradient for offshore flow and attendant fire weather
   concerns across southern California.

   ...Eastern Wyoming, western South Dakota, and southeastern
   A strengthening surface pressure gradient across the region (in
   response to strengthening lee trough just east of the region) will
   foster strengthening westerly surface flow - approaching 20 mph with
   stronger gusts during peak heating hours.  RH values will fall into
   the 19-25% range as a result of insolation and unseasonably warm
   surface temperatures, perhaps reaching 80F in a few locations. 
   Widespread areas of elevated to near-critical fire weather
   conditions will develop across the region as latest fuels guidance
   suggest favorable conditions for rapid fire spread.  Some part of
   this region may need to be upgraded to critical later - especially
   if later high-resolution guidance depicts more widespread critical
   fire weather conditions than currently depicted.

   ...Coastal Ranges of Southern California...
   Low-level flow will eventually veer to northerly/northwesterly
   during the afternoon hours in response to an increasing surface
   pressure gradient across the region.  Relatively cool surface
   temperatures (50s F to near 70s F) will aid in keeping RH values
   above critical thresholds (i.e., 20-30%) across the area, although
   surface wind speeds will reach and locally exceed 20-25 mph
   especially in terrain-favored areas.  Pockets of elevated fire
   weather conditions will develop during the afternoon and persist
   into the evening.

   ..Cook.. 10/20/2017

   ...Please see for graphic product...



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