NWS Storm Prediction Center - Day 1-2 Fire Weather Outlook
Updated: Tue Jul 23 16:38:03 UTC 2019
Jul 23, 2019 Day 1 Fire Weather Outlook
Day 1 Fire
 Pop.  Cities  CWAs  RFCs  Interstates  Counties  ARTCC  FEMA Regions  Day 1 Surface Analysis 

Risk Area (sq. mi.) Area Pop. Some Larger Population Centers in Risk Area
Critical 10,364 7,869 No Major Population Center in Risk Area
   ZCZC SPCFWDDY1 ALL
   FNUS21 KWNS 231636

   Day 1 Fire Weather Outlook  
   NWS Storm Prediction Center Norman OK
   1136 AM CDT Tue Jul 23 2019

   Valid 231700Z - 241200Z

   ...CRITICAL FIRE WEATHER AREA FOR PORTIONS OF FAR NORTHEAST
   CALIFORNIA INTO SOUTHEAST OREGON...

   The isolated dry thunderstorm area was expanded in Oregon and Nevada
   and into Washington and western Idaho. Lightning has already
   occurred in southeast Oregon/southwest Idaho and continues to occur
   across central/northern Washington this morning. Storms are likely
   to develop ahead of the cold front in the Pacific Northwest and
   across the Great Basin into the Pacific Northwest/northern Rockies
   as moisture and mid-level disturbances rotate around the
   western/northern periphery of the Four Corners High. Some of the
   storms may produce wetting rains, but given 20-40 knot storm
   motions, dry fuels, and a cold frontal passage this evening/tonight,
   ignition and spread of wildfires could result. The critical and
   elevated areas were also modified based on latest
   guidance/observations for conditions this afternoon ahead of the
   cold front.

   ..Nauslar.. 07/23/2019

   .PREV DISCUSSION... /ISSUED 0132 AM CDT Tue Jul 23 2019/

   ...Synopsis...
   An unseasonably strong mid-level trough will overspread the Pacific
   Northwest today with increasing mid-level flow ahead of this trough.
   Deep mixing and some downslope flow in northern California, southern
   Oregon, and northwest Nevada may lead to critical fire weather
   conditions. In addition, isolated dry thunderstorms are possible
   from northern Nevada into southeast Oregon and southern Idaho.

   ...Northeast California, southern Oregon, and northwest Nevada...
   Southwesterly downslope flow of 20 to 30 mph is expected to develop
   during the afternoon hours. Relative humidity is expected to be in
   the 12 to 20 percent range in this area. Expected convection and
   associated cloud cover may keep relative humidity above 15 percent
   in northwest Nevada, so this area is only in an elevated delineation
   despite similarly strong 20 to 25 mph surface winds as farther
   north.

   ...Dry thunderstorms in Northern Nevada, southwest Idaho, and
   eastern Oregon...
   Isolated thunderstorms are expected to form along a cold front in
   western Nevada and southern Oregon and move quickly northeastward
   through the afternoon and evening. These storms will form in an
   environment with PWAT values around 0.75", forward speed of 35 to 40
   mph, and cloud bases above 10kft. Therefore, these storms are
   expected to drop very little rainfall in any one area and thus they
   will pose a threat for lightning starts. In addition, strong surface
   winds in the wake of this front may cause any lightning starts to
   quickly spread.

   ...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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