Storm Prediction Center
Day 1 and Day 2 Fire Weather Outlooks

Day 1 Fire Weather Forecast graphic
Risk Area (sq. mi.) Area Pop. Some Larger Population Centers in Risk Area
No Risk Areas Forecast

Click for Day 1 FireWX Areal Outline Product

   ZCZC SPCFWDDY1 ALL
   FNUS21 KWNS 110736

   Day 1 Fire Weather Outlook  
   NWS Storm Prediction Center Norman OK
   0136 AM CST Mon Dec 11 2017

   Valid 111200Z - 121200Z

   ...Synopsis...
   Mid-level ridging will persist across the western United States,
   with a deep trough found across the East. A short-wave trough moving
   through the mid-level flow across the East will help drive a surface
   cold front south through the Plains. 

   ...Southern California...

   Offshore winds will continue through Monday and Monday night, albeit
   not as strong as in previous days. Coincident with this, warm
   temperatures and a dry airmass will support minimum
   relative-humidity values falling into the single digits and teens
   across much of the area. Additionally, overnight recovery should
   remain poor, leaving little reprieve from the low relative humidity.
   The result will be elevated fire-weather conditions.

   ...Central United States...

   Temperatures will quickly warm into the 60s and 70s ahead of a
   surface cold front moving southward through the Plains on Monday.
   Additionally, a very dry airmass in place as a result of several
   days of northerly winds across the Plains and Gulf of Mexico
   scouring out most of what little moisture existed. The dry airmass
   is borne out in evening (00Z) soundings across the Plains where
   near-record low precipitable-water values for this time of year are
   observed. The result will be warm temperatures and relative-humidity
   values falling to near-critical to critical levels. These warm, dry
   conditions will combine with winds in the 10-20 mph range to result
   in elevated to locally critical fire-weather conditions across the
   region. Stronger winds may exist across northern portions of the
   highlighted area, but cold-air advection behind the front will allow
   for the relative humidity to increase, slightly offsetting the
   impacts of stronger winds.

   ..Marsh.. 12/11/2017

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

      
Day 2 Fire Weather Forecast graphic
Risk Area (sq. mi.) Area Pop. Some Larger Population Centers in Risk Area
No Risk Areas Forecast

Click for Day 2 FireWX Areal Outline Product (KWNSPFWFD2)

   ZCZC SPCFWDDY2 ALL
   FNUS22 KWNS 110736

   Day 2 Fire Weather Outlook  
   NWS Storm Prediction Center Norman OK
   0136 AM CST Mon Dec 11 2017

   Valid 121200Z - 131200Z

   ...Synopsis...
   The persistent mid-level, west-to-east ridge-trough pattern across
   the United States will be reinforced on Tuesday as a short-wave
   trough crests the ridge and quickly digs toward the base of the
   eastern trough during the afternoon and nighttime hours. This
   pattern will maintain/reinforce the dry airmass across the central
   Plains and the offshore flow across Southern California. The
   aforementioned short-wave trough may aid the strengthening of the
   surface-pressure gradient across Southern California late on
   Tuesday, which would increase wind speeds to near or above critical
   fire-weather thresholds. Will hold off on adding a critical area at
   this time owing to uncertainty in just how strong the winds end up
   being.

   Farther east, in the Plains, despite the very dry airmass in place,
   cooler temperatures and weaker winds on Tuesday will act to limit
   the overall fire-weather threat. However, if temperatures end up
   being warmer than forecast or winds are a bit stronger, elevated
   highlights will become necessary.

   ..Marsh.. 12/11/2017

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

      

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