566  
FXUS01 KWBC 102004  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
404 PM EDT FRI AUG 10 2018  
 
VALID 00Z SAT AUG 11 2018 - 00Z MON AUG 13 2018  
 
...HEAVY RAIN POSSIBLE OVER PORTIONS OF NEW ENGLAND THROUGH  
TONIGHT...  
 
...HEAVY RAIN EXPECT OVER PARTS OF THE SOUTHERN PLAINS AND  
SOUTHWEST...  
 
...HEAT WAVE CONTINUES ACROSS THE INTERMOUNTAIN WEST AND NORTHERN  
PLAINS...  
 
 
A FRONT WILL SLOWLY PUSH ACROSS SOUTHERN NEW ENGLAND, OHIO VALLEY  
AND INTO THE SOUTHERN PLAINS THROUGH TONIGHT. THE NORTHERN PORTION  
OF THIS FRONT WILL FIRE OFF CONVECTION WHICH COULD PRODUCE HEAVY  
RAINFALL. A SLIGHT RISK OF FLASH FLOODING IS POSSIBLE--WITH A  
MARGINAL RISK EXTENDING INTO THE OHIO VALLEY THROUGH TOMORROW  
MORNING. ANOTHER QUASI-STATIONARY BOUNDARY TO THE SOUTH IS  
EXTENDING INTO THE SOUTHEAST AND SOUTHERN PLAINS ALSO. THIS  
BOUNDARY WILL ALSO BE THE FOCAL POINT FOR SHOWERS AND  
THUNDERSTORMS. FLASH FLOODING WILL BE A CONCERN ESPECIALLY FOR  
AREAS IN CENTRAL AND WEST TEXAS ALONG WITH NEW MEXICO. THESE TWO  
BOUNDARIES ARE WILL STAY PUT THROUGH THE WEEKEND--MAKING IT QUITE  
WET FROM THE SOUTHERN PLAINS NORTHWARD INTO THE MID-ATLANTIC AND  
NORTHEAST. A MARGINAL RISK OF FLASH FLOODING IS POSSIBLE FOR THE  
NORTHEAST, MID-ATLANTIC, AND CENTRAL APPALACHIANS ON SATURDAY AND  
SUNDAY. MOST OF CENTRAL AND WEST TEXAS CAN EXPECT A SLIGHT RISK OF  
FLASH FLOODING THROUGH THE WEEKEND.  
 
AN ACTIVE MONSOON PATTERN IS IN PLACE ACROSS THE SOUTHWEST AS  
PLENTY OF MOISTURE WILL BE IN PLACE TO FIRE OFF DIURNALLY DRIVEN  
THUNDERSTORMS ACROSS THIS REGION AND THE GREAT BASIN. SCATTERED TO  
WIDESPREAD THUNDERSTORMS CAN BE EXPECTED IN THE LATE AFTERNOON AND  
EARLY EVENING. THE AREAS PRONE TO FLASH FLOODING, SUCH AS  
FAVORABLE AREAS IN THE TERRAIN AND URBAN REGIONS, WILL BE AT RISK  
THROUGH THE WEEKEND--THUS A SLIGHT RISK IS IN PLACE OVER PARTS OF  
THE SOUTHWEST.  
 
THE ONGOING HEAT WAVE OVER THE PACIFIC NORTHWEST, INTERMOUNTAIN  
WEST AND NORTHERN PLAINS IS EXPECTED TO CONTINUE. BY TOMORROW,  
PARTS OF THE PACIFIC NORTHWEST UNDER THE OPPRESSIVE HEAT WILL HAVE  
HIGH TEMPERATURES DROPPING INTO THE 80S DUE TO A STRONG COLD FRONT  
MOVING THROUGH THE REGION. HOWEVER, EASTERN IDAHO, MOST OF MONTANA  
AND THE NORTHERN PLAINS WILL HAVE HIGH TEMPERATURES TO STAY OVER  
100 DEGREES--WHICH IS NEARLY 20 DEGREES ABOVE NORMAL FOR THIS TIME  
OF YEAR. AS THE COLD FRONT PASSES THROUGH MOST OF MONTANA ON  
SATURDAY, HIGH TEMPERATURES IN THESE AREAS WILL COME BACK TO NEAR  
NORMAL ON SUNDAY. HOWEVER, THE NORTHERN PLAINS CONTINUE TO HAVE  
WELL ABOVE NORMAL TEMPERATURES ROUNDING OUT THE END OF THE WEEKEND  
AS THE FRONT SLOWLY SINKS SOUTHWARD BY SUNDAY NIGHT.  
 
REINHART  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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