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Current Fire Watches and Warnings
   ZCZC SPCFWDDY1 ALL
   FNUS21 KWNS 141546

   Day 1 Fire Weather Outlook  
   NWS Storm Prediction Center Norman OK
   0946 AM CST Thu Dec 14 2017

   Valid 141700Z - 151200Z

   ...CRITICAL FIRE WEATHER AREA FOR PORTIONS OF SOUTHERN CALIFORNIA...

   The ongoing forecast is on track and rationale is unchanged from the
   previous forecast.  Areas of elevated to critical fire weather
   conditions are expected in portions of southern California as an
   offshore gradient persists.  Easterly winds in terrain-favored areas
   are already exceeding 20 mph (with gusts in excess of 45 mph) and RH
   values are below 10% at many observation sites.  These conditions
   will persist for at least a few more hours, with poor overnight
   recovery resulting in elevated to critical conditions persisting
   well after dark.

   Near-critical conditions are also expected in portions of the Lower
   Colorado River Valley as dry northerly flow and low RH persists.

   See the previous discussion below for more information.

   ..Cook.. 12/14/2017

   .PREV DISCUSSION... /ISSUED 0133 AM CST Thu Dec 14 2017/

   ...Synopsis...
   A shortwave trough embedded in larger-scale flow will dig southward
   across the southwestern U.S. into northwest Mexico today. This will
   result in a strong mid/upper level north/northeasterly jet streak
   overspreading portions of the Great Basin and the Lower CO River
   Valley and adjacent southern CA. At the surface, strong high
   pressure will remain over the Intermountain West. This will result
   in continued fire weather concerns across parts of southern CA as
   well as the Lower CO River Valley. 

   ...Southern CA...

   Critical fire weather conditions will persist today. Very dry
   conditions continue, with single-digit RH values expected by early
   afternoon. Some diurnal weakening of the pressure gradient is
   anticipated, which may yield some lightening of winds speeds during
   the afternoon/early evening before the gradient once again increases
   overnight, with a corresponding increase in wind speeds once again.
   Winds of 20-30 mph with gusts of 40-55 mph are possible. Overnight
   RH recovery will remain very poor.

   ...Lower CO Valley...

   Gusty north winds and low RH values will bring elevated to locally
   critical conditions to the region today. High temperatures will
   approach the low to mid 70s and boundary-layer mixing will result in
   downward transport of strong midlevel winds. Sustained north winds
   of 15-20 mph with higher gusts are expected. RH values will fall
   into 10-20 percent range. Wind speeds will diminish overnight and RH
   values will increase to the 30-40 percent range.

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

   CLICK FOR DAY 1 FIREWX AREAL OUTLINE PRODUCT (KWNSPFWFD1)
      


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