352  
FXUS01 KWBC 180725  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
324 AM EDT WED OCT 18 2017  
 
VALID 12Z WED OCT 18 2017 - 12Z FRI OCT 20 2017  
   
..HEAVY RAINFALL EXPECTED ACROSS THE PACIFIC NORTHWEST
 
 
   
..HEAVY SNOW POSSIBLE ACROSS THE CASCADES AND NORTHERN ROCKIES
 
 
   
..STORMY WEATHER CONTINUES FOR FLORIDA
 
 
A FRONTAL SYSTEM WILL BEGIN TO APPROACH THE PACIFIC NORTHWEST BY  
THIS EVENING. PRECIPITATION WILL INCREASE THROUGHOUT THE DAY AND  
INTO TONIGHT. BY THURSDAY, THE STRONG COLD FRONT WILL BEGIN  
PUSHING EASTWARD OVER THE PACIFIC NORTHWEST AND TOWARD NORTHERN  
CALIFORNIA WITH PRECIPITATION SPREADING FARTHER EAST AS A RESULT.  
ONCE THE FRONT MOVES INTO THE CENTRAL GREAT BASIN, RAINFALL WILL  
ALSO FOLLOW SUIT; HOWEVER, DUE TO ONSHORE FLOW, SHOWERS AND HIGHER  
ELEVATION SNOW WILL CONTINUE ACROSS THE PACIFIC NORTHWEST. THERE  
IS A MARGINAL RISK FOR FLASH FLOODING IN WESTERN WASHINGTON AND  
NORTHWESTERN OREGON ON THURSDAY AS A RESULT OF THE HEAVY RAINFALL.  
ON THURSDAY, SNOWFALL WILL EXPAND THROUGHOUT THE WASHINGTON AND  
OREGON CASCADES AND PARTS OF THE NORTHERN ROCKIES--WITH SOME LIGHT  
SNOWFALL IN HIGHER ELEVATIONS OF NORTHERN CALIFORNIA. BY FRIDAY,  
SNOW WILL CONTINUE ACROSS THE CASCADES AND THROUGHOUT THE NORTHERN  
ROCKIES.  
 
A STALLED FRONTAL BOUNDARY WILL LINGER NEAR SOUTH FLORIDA FOR THE  
REMAINDER OF THE WEEK. EASTERLY FLOW WILL BRING TROPICAL MOISTURE  
ACROSS THE STATE WHILE THE STATIONARY FRONT WILL ACT AS A FOCAL  
POINT FOR CONTINUING SHOWERS AND THUNDERSTORMS THROUGH FRIDAY.  
MOST THE HEAVY RAINFALL WILL BE CONFINED TO THE ATLANTIC COASTLINE  
AND THE SOUTHERN HALF OF FLORIDA--WITH A MARGINAL RISK OF FLASH  
FLOODING IS IN PLACE THE CENTRAL ATLANTIC COASTLINE FOR FLORIDA  
TODAY.  
 
SHOWERS AND THUNDERSTORMS WILL APPROACH THE MIDDLE AND  
SOUTHEASTERN TEXAS COAST BY THURSDAY EVENING. A DISTURBANCE ALOFT  
ALONG WITH INCREASING MOISTURE WILL GIVE WAY TO PRECIPITATION THAT  
WILL LAST THROUGH FRIDAY. MEANWHILE, HIGH TEMPERATURES IN THE MID  
TO UPPER 70S WILL BE POSSIBLE ACROSS THE NORTHERN PLAINS ON  
THURSDAY AND FRIDAY--WHICH IS 10-20 DEGREES ABOVE NORMAL FOR THIS  
TIME OF YEAR. BECAUSE OF THE WARM AND DRY CONDITIONS, ELEVATED  
FIRE WEATHER IS POSSIBLE ON WEDNESDAY AND THURSDAY FOR PORTIONS OF  
THE NORTHERN HIGH PLAINS.  
 
REINHART  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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