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    Day 2 FW Outlook >
Sep 25, 2017 Day 1 Fire Weather Outlook
Updated: Mon Sep 25 15:44:03 UTC 2017 (Print Version | 20170925 1700Z Day 1 FireWX shapefile | 20170925 1700Z Day 1 FireWX KML)
Day 1 Fire
 Population  Cities/Towns  CWAs  Interstates  Counties  FEMA Regions  Day 1 Surface Analysis

Risk Area (sq. mi.) Area Pop. Some Larger Population Centers in Risk Area
No Risk Areas Forecast
   FNUS21 KWNS 251543

   Day 1 Fire Weather Outlook  
   NWS Storm Prediction Center Norman OK
   1043 AM CDT Mon Sep 25 2017

   Valid 251700Z - 261200Z

   Previous outlook remains on track and no changes are necessary. See
   discussion below for more details.

   ..Leitman.. 09/25/2017

   .PREV DISCUSSION... /ISSUED 0155 AM CDT Mon Sep 25 2017/

   The persistent upper trough/low centered over the Great Basin will
   begin to lift northeastward into the northern Plains and adjacent
   Canadian provinces throughout the period. Northerly mid-level winds
   of 35 to 45 kt are forecast over much of CA along the western
   periphery of the upper trough. At the surface, high pressure will
   remain anchored over the Great Basin and northern/central Rockies
   through the period, which will support a weak to locally moderate
   offshore wind event across portions of southern CA.

   ...Portions of the Sacramento Valley and Adjacent Coastal Ranges of
   Northern CA...
   Enhanced mid-level winds, combined with diurnal heating, should
   allow for modest northerly surface winds to mix to the surface this
   afternoon across portions of the Sacramento Valley and adjacent
   Coastal Ranges of northern CA. Sustained winds up to 15 mph appear
   possible, with stronger gusts occurring at higher elevations. RH
   values will once again decrease into the 10-20% range given an
   antecedent dry low-level airmass and diurnal heating. These forecast
   meteorological conditions combined with continued dry fuels support
   an elevated designation across this region.

   ...Portions of Southern CA...
   Elevated fire weather conditions are ongoing early this morning and
   will develop again Tuesday morning across portions of southern CA
   when the surface pressure gradient will be maximized. During these
   periods, offshore winds will increase to 15-20 mph, with stronger
   gusts possible in higher elevations. RH values will likely remain
   low through much of the period owing to downslope warming/drying
   effects, and overnight RH recovery is forecast to remain poor. 06Z
   surface observations support these forecast trends, particularly at
   high elevations where winds are gusting to 25-30 mph and RH lowering
   to near 20% in a few locations. The continuation of drying fuels
   across this region supports the elevated area. The lack of an even
   stronger forecast surface pressure gradient and related winds
   continues to preclude a critical designation.

   ...Please see for graphic product...

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