271  
FXUS01 KWBC 190751  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
350 AM EDT THU OCT 19 2017  
 
VALID 12Z THU OCT 19 2017 - 12Z SAT OCT 21 2017  
   
..HEAVY RAINFALL EXPECTED ACROSS THE PACIFIC NORTHWEST
 
 
   
..SNOW EXPECTED ACROSS THE CASCADES AND NORTHERN ROCKIES
 
 
...SCATTERED THUNDERSTORMS FOR FLORIDA, THE SOUTHWEST, AND THE  
TEXAS COAST...  
 
...HEAVY RAINFALL AND AN ENHANCED RISK OF SEVERE THUNDERSTORMS ARE  
POSSIBLE FOR THE SOUTHERN PLAINS TO THE MIDDLE MISSISSIPPI  
VALLEY...  
 
AS A COLD FRONT DIVES ACROSS THE PACIFIC NORTHWEST TODAY,  
PRECIPITATION WILL INCREASE THROUGHOUT THAT REGION AND INTO THE  
NORTHERN ROCKIES. HEAVY RAINFALL IS EXPECTED TO OCCUR IN WESTERN  
WASHINGTON AND NORTHWESTERN OREGON WHERE THERE IS A MARGINAL RISK  
OF FLASH FLOODING. IN ADDITION, HIGHER ELEVATION SNOW IS EXPECTED  
FOR THE CASCADES IN ADDITION TO THE NORTHERN PORTIONS OF THE  
SIERRA NEVADA MOUNTAIN RANGE. AS THE FRONT PUSHES ACROSS  
INTERMOUNTAIN WEST ON FRIDAY, PRECIPITATION WILL FOLLOW SUIT--WITH  
SNOW TAMPING UP ALONG THE NORTHERN ROCKIES. ONSHORE FLOW WILL KEEP  
RAINFALL AND HIGHER ELEVATION SNOW IN THE PACIFIC NORTHWEST ON  
FRIDAY. BY SATURDAY, ANOTHER FRONTAL SYSTEM WILL BEGIN APPROACHING  
THE PACIFIC NORTHWEST, ENSURING ADDITIONAL HEAVY RAINFALL AND  
HIGHER ELEVATION SNOW ONCE AGAIN FOR THE REGION.  
 
A SLOW MOVING FRONT NEAR SOUTH FLORIDA WILL LINGER OVER THE NEXT  
FEW DAYS. WITH PLENTY OF MOISTURE IN PLACE FROM EASTERLY FLOW,  
THIS FRONT WILL ACT AS A FOCAL POINT FOR SHOWERS AND THUNDERSTORMS  
ESPECIALLY IN THE AFTERNOON AND EVENING. THE HEAVIEST ACTIVITY IS  
EXPECTED ALONG THE ATLANTIC COAST AND SOUTH FLORIDA. AS AN UPPER  
LEVEL TROUGH APPROACHES THE SOUTHWEST AND SOUTHERN PLAINS, THIS  
WILL FIRE OFF CONVECTION ACROSS NEW MEXICO AND WEST TEXAS. IN  
ADDITION, SOUTHEASTERLY FLOW AHEAD OF AN APPROACHING UPPER LEVEL  
TROUGH ALONG THE DEEP SOUTH TEXAS COASTLINE WILL BRING SHOWERS AND  
THUNDERSTORMS TO THE AREA TODAY. ON FRIDAY AND SATURDAY, THE  
MOISTURE AXIS WILL SHIFT TO THE MIDDLE AND UPPER TEXAS  
COASTLINES--BRINGING SCATTERED SHOWERS AND THUNDERSTORMS TO THESE  
AREAS.  
 
MEANWHILE, THE STRONG COLD FRONT THAT PUSHES ACROSS THE  
INTERMOUNTAIN WEST IS EXPECTED TO SWEEP OVER THE PLAINS ON  
SATURDAY. MOISTURE FROM THE GULF OF MEXICO WILL BE ON TAP AND WITH  
INSTABILITY IN PLACE--A LINE OF SHOWERS AND THUNDERSTORMS ARE  
EXPECTED TO DEVELOP IN THE PLAINS. HEAVY RAINFALL IS POSSIBLE FROM  
THE RED RIVER VALLEY TO THE MIDDLE MISSISSIPPI VALLEY--WHERE THERE  
IS A SLIGHT RISK OF FLASH FLOODING. IN ADDITION, THERE IS AN  
ENHANCED RISK OF SEVERE THUNDERSTORMS FOR NORTH TEXAS AND  
CENTRAL/EASTERN OKLAHOMA. PLEASE SEE THE STORM PREDICTION CENTER  
FOR MORE INFORMATION ON THE SEVERE WEATHER IMPACTS WITH THIS  
SYSTEM.  
 
REINHART  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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