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    Day 2 FW Outlook >
Jul 21, 2017 Day 1 Fire Weather Outlook
Updated: Fri Jul 21 08:05:03 UTC 2017 (Print Version | 20170721 1200Z Day 1 FireWX shapefile | 20170721 1200Z 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
Critical 57,230 185,797 Great Falls, MT...Havre, MT...Miles City, MT...Lewistown, MT...Glendive, MT...
   FNUS21 KWNS 210803

   Day 1 Fire Weather Outlook  
   NWS Storm Prediction Center Norman OK
   0303 AM CDT Fri Jul 21 2017

   Valid 211200Z - 221200Z


   The main belt of westerlies is expected to remain across the
   northern tier of states today. An upper trough is expected to move
   eastward across the Canadian Prairie provinces, as an associated
   surface cyclone moves from eastern Montana into the upper Midwest
   and a trailing cold front sweeps through portions of the
   northern/central Plains. 

   ...Portions of Montana into the far western Dakotas...
   Dry west-northwesterly low-level flow will develop in the wake of
   the frontal passage today. While temperatures will be somewhat
   cooler compared to previous days, sufficient heating of a dry
   airmass will result minimum RH values of 10-20% across much of
   Montana into the far western Dakotas. The greatest wind speeds are
   still expected across north-central into eastern MT, where 20-25 mph
   sustained winds are expected this afternoon, resulting in a threat
   of critical fire weather conditions. Surrounding the critical area,
   elevated to locally critical conditions are expected from northwest
   MT into the far western Dakotas, where winds may be slightly weaker
   but very low RH values are still expected. Some expansion of the
   critical area to the east-southeast may be required in the Day 1
   update depending on trends in short-term obs and guidance. 

   ...Snake River Valley of Idaho...
   Modestly enhanced west-southwesterly winds still appear possible
   across portions of the Snake River valley this afternoon. Sustained
   wind speeds of 15-20 mph combined with minimum RH values of 7-15%
   will result in a threat of elevated fire weather conditions.

   ..Dean.. 07/21/2017

   ...Please see for graphic product...

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