NWS Storm Prediction Center - Day 1-2 Fire Weather Outlook
Updated: Sun Jul 22 16:51:02 UTC 2018
Jul 22, 2018 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
No Risk Areas Forecast
   FNUS21 KWNS 221650

   Day 1 Fire Weather Outlook  
   NWS Storm Prediction Center Norman OK
   1150 AM CDT Sun Jul 22 2018

   Valid 221700Z - 231200Z

   12Z soundings from Elko NV and Salt Lake City UT show precipitable
   water values of 0.95 and 1.16 inch, respectively. Visible satellite
   imagery also shows considerable cloudiness from northeastern
   NV/northern UT into western WY, which is likely related to prior
   convection and a weak shortwave trough rotating northeastward around
   an upper ridge centered over the southern High Plains and Southwest.
   The combination of unfavorable precipitable water values, widespread
   cloudiness limiting boundary layer warming/drying this afternoon,
   and modest mid-level winds suggests that isolated dry thunderstorms
   will be unlikely today. Have therefore removed the isolated dry
   thunderstorm delineation for this region.

   A separate isolated dry thunderstorm area remains generally
   unchanged for parts of northern CA into southern OR and far
   northwestern NV. No changes have been made to the elevated area
   across parts of the Snake River Valley in southern/eastern ID. See
   the previous discussion below for more information.

   ..Gleason.. 07/22/2018

   .PREV DISCUSSION... /ISSUED 0138 AM CDT Sun Jul 22 2018/

   A weak ridge will be present across much of the western CONUS on
   Sunday with relatively weak mid-level winds across much of the area.
   Monsoon moisture is present across much of the Great Basin,
   Southwest, and central Rockies, with much drier air into the Pacific
   Northwest. RH values will drop into the 10 to 15 percent range
   across much of eastern Oregon and southern Idaho. RH values may drop
   into the single digits in portions of southern Idaho. Afternoon
   sustained surface winds are expected to increase to around 15 mph in
   the Snake River Valley during the afternoon hours. Therefore, an
   elevated area is highlighted. 

   In addition, dry thunderstorms are possible from northern California
   into southern Oregon and northwest Nevada as well as northeast
   Nevada across northern Utah and into southwest Wyoming. Have kept a
   space between these two areas as there appears to be a convective
   lull between the two locations. Slow storm motions and PWAT values
   approaching one inch in some areas will likely lead to some of the
   storms being wet, but very dry fuels are in place, and some drier
   storms are expected.

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


   Source:  NWS Fire Weather Outlook
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