517  
FNUS21 KWNS 300818  
FWDDY1  
 
DAY 1 FIRE WEATHER OUTLOOK  
NWS STORM PREDICTION CENTER NORMAN OK  
0317 AM CDT TUE MAY 30 2017  
 
VALID 301200Z - 311200Z  
   
..SYNOPSIS
 
 
AN UPPER TROUGH OVER THE PACIFIC IS FORECAST TO BEGIN IMPACTING  
PORTIONS OF THE WEST TODAY, AS THE UPPER RIDGE PREVIOUSLY IN PLACE  
BEGINS TO WEAKEN AND SHIFT EASTWARD. THE PERSISTENT CYCLONE IN THE  
VICINITY OF WESTERN ONTARIO AND THE UPPER GREAT LAKES IS FORECAST TO  
MOVE LITTLE THROUGH THE PERIOD, AS A BROAD UPPER TROUGH REMAINS IN  
PLACE OVER MUCH OF THE CENTRAL AND EASTERN CONUS.  
 
...PORTIONS OF CENTRAL/NORTHERN OR AND SOUTHERN WA EAST OF THE  
CASCADE RANGE...  
AS THE UPPER RIDGE IS BROKEN DOWN BY THE APPROACHING TROUGH,  
ISOLATED TO WIDELY SCATTERED THUNDERSTORMS ARE EXPECTED TO DEVELOP  
ALONG AND EAST OF THE CASCADE RANGE ACROSS PORTIONS OF OREGON AND  
WASHINGTON. STRONG HEATING AND DEEP MIXING PRIOR TO STORM INITIATION  
WILL TEND TO LIMIT THE RAINFALL POTENTIAL OF SOME OF THIS ACTIVITY,  
THOUGH PW VALUES GENERALLY ABOVE 0.75" AND RATHER SUBSTANTIAL  
SURFACE-BASED INSTABILITY WILL ALSO SUPPORT WETTING RAINFALL IN SOME  
LOCATIONS. STRONG AND ERRATIC OUTFLOW WINDS WILL ALSO BE POSSIBLE  
WITH THE STRONGEST CELLS AND WITH ANY CLUSTERS THAT DEVELOP.  
 
WHILE SOME UNCERTAINTY REMAINS REGARDING FUEL RECEPTIVITY, HOT AND  
DRY CONDITIONS AND THE LACK OF RECENT RAINFALL HAVE CURED FINE  
FUELS, SUCH THAT THERE MAY BE SOME RISK OF IGNITIONS WITH LIGHTNING  
ACTIVITY. GIVEN THESE CONCERNS, A ISOLATED DRY-THUNDERSTORM AREA HAS  
BEEN INTRODUCED FOR PORTIONS OF CENTRAL/NORTHERN OR AND SOUTHERN WA  
EAST OF THE CASCADE RANGE.  
 
..DEAN.. 05/30/2017  
   
..PLEASE SEE WWW.SPC.NOAA.GOV/FIRE FOR GRAPHIC PRODUCT
 
 

 
 
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