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    Day 2 FW Outlook >
Sep 18, 2018 Day 1 Fire Weather Outlook
Updated: Tue Sep 18 15:08:02 UTC 2018 (Print Version | 20180918 1700Z Day 1 FireWX shapefile | 20180918 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
Critical 51,873 1,000,486 Provo, UT...Orem, UT...Draper, UT...Cottonwood Heights, UT...Lehi, UT...
   ZCZC SPCFWDDY1 ALL
   FNUS21 KWNS 181507

   Day 1 Fire Weather Outlook  
   NWS Storm Prediction Center Norman OK
   1007 AM CDT Tue Sep 18 2018

   Valid 181700Z - 191200Z

   ...CRITICAL FIRE WEATHER AREA FOR EXTREME EAST-CENTRAL
   NEVADA...SOUTHWEST INTO NORTHEAST UTAH...AND SOUTHWEST INTO
   SOUTH-CENTRAL WYOMING...

   Minor adjustments to the elevated and critical area have been made
   this morning. These changes are supported by latest hi-res HRRR and
   HREF guidance, in addition to surface observation trends this
   morning. Overall forecast reasoning remains unchanged. See previous
   outlook below for more details.

   ..Leitman.. 09/18/2018

   .PREV DISCUSSION... /ISSUED 0116 AM CDT Tue Sep 18 2018/

   ...Synopsis...
   A mid-level shortwave will impact potions of the Great Basin and
   central Rockies today. The strong mid-level flow associated with
   this feature will boost surface wind speeds as boundary layers
   deepen in the afternoon. At the surface, troughing within the Great
   Basin into Central Wyoming as well as high pressure behind a cold
   front will build into the northern Rockies will further enhance the
   pressure gradient.

   ...East-central Nevada...west-central into northeastern
   Utah...southwestern/south-central Wyoming...
   Critical fire weather conditions are expected during the afternoon
   as surface winds reach 20-25 mph. Mid-level flow will drive much of
   the critical conditions for parts of Nevada and Utah. In Wyoming,
   high-resolution guidance appears to be picking up on the
   strengthening surface pressure gradient with the approach of a cold
   front from the north. Afternoon RH values will range from 5-15%.
   Areas surrounding the critical area will see similar RH values but
   surface winds should fall short of critical criteria, ranging only
   from 15-20 mph.

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

   CLICK FOR DAY 1 FIREWX AREAL OUTLINE PRODUCT (KWNSPFWFD1)
      
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Page last modified: September 18, 2018
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