NWS Storm Prediction Center - Day 1-2 Fire Weather Outlook
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Jul 20, 2017 Day 1 Fire Weather Outlook
Day 1 Fire
 Population  Cities  CWAs  Interstates  Counties  FEMA Regions  Day 1 Surface Analysis 

Risk Area (sq. mi.) Area Pop. Some Larger Population Centers in Risk Area
Critical 16,167 115,895 Great Falls, MT...
   ZCZC SPCFWDDY1 ALL
   FNUS21 KWNS 201611

   Day 1 Fire Weather Outlook  
   NWS Storm Prediction Center Norman OK
   1111 AM CDT Thu Jul 20 2017

   Valid 201700Z - 211200Z

   ...CRITICAL FIRE WEATHER AREA FOR PARTS OF NORTHERN MONTANA...

   A critical designation is introduced across north-central Montana,
   where enhanced westerly winds are forecast to develop behind a cold
   front this afternoon and evening. Sustained westerly winds around
   20-25 mph will combine with RH values below 20% and very dry fuels
   to promote critical fire-weather concerns. Elsewhere across the
   northern Rockies region, locally critical conditions may develop
   later today, but confidence in sufficiently strong winds remains too
   low for the introduction of a critical area.

   Additionally, an isolated dry-thunderstorm area is introduced across
   northern Montana. With a mid-level impulse skirting the region (and
   the aforementioned passage of the cold front), isolated storms may
   develop late today. Weak mid-level buoyancy, a deep/dry boundary
   layer, and quick storm motions will support a potential for a few
   dry lightning strikes.

   ..Picca.. 07/20/2017

   .PREV DISCUSSION... /ISSUED 0158 AM CDT Thu Jul 20 2017/

   ...Synopsis...
   Upper ridging will remain prominent across the central/southern
   Plains today, while an upper trough moves slowly northeastward from
   BC and the Pacific Northwest over the northern Rockies and adjacent
   Canadian provinces. Enhanced mid-level winds attendant to this
   trough should elevate fire weather concerns this afternoon and
   evening across parts of the interior Pacific Northwest, northern
   Great Basin/Rockies, and northern High Plains.

   ...Portions of the Interior Pacific Northwest...
   Behind a surface cold front, temperatures will be slightly cooler
   than yesterday across interior portions of the Pacific Northwest.
   Regardless, strong/gusty west-southwesterly winds around 15-20 mph
   will likely develop this afternoon as downslope trajectories act to
   warm/dry the low levels. RH values will become lowered into
   generally the 20-25% range, supporting the ongoing elevated fire
   weather delineation.

   ...Portions of the Northern Great Basin/Rockies into the Northern
   High Plains...
   A corridor of enhanced mid-level southwesterly winds will remain
   over parts of the northern Great Basin/Rockies into the northern
   High Plains. As diurnal mixing of the boundary layer occurs, these
   mid-level winds will reach the surface and promote strong sustained
   winds of 15-20 mph. RH values will also likely become lowered into
   the 10-20% range from the Snake River Valley of ID and vicinity
   northeastward into parts of the northern Rockies/High Plains. Dry
   fuels will exist across a majority of these regions, supporting an
   elevated fire weather threat. Locally critical conditions may be
   realized across a subset of the Snake River Valley in ID, where
   sustained winds may exceed 20 mph on a brief/spotty basis.

   ...Please see www.spc.noaa.gov/fire for graphic product...

   CLICK TO GET DAY 1 FIREWX AREAL OUTLINE PRODUCT (KWNSPFWFD1)
      


   Source:  NWS Fire Weather Outlook
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