854  
FXUS01 KWBC 302000  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
359 PM EDT MON JUL 30 2018  
 
VALID 00Z TUE JUL 31 2018 - 00Z THU AUG 02 2018  
 
...UNSETTLED WEATHER GRIPS THE EASTERN U.S. WITH RAIN AND  
THUNDERSTORMS EXPECTED...  
 
...HEAT CONTINUES IN THE INTERMOUNTAIN WEST WHILE BELOW AVERAGE  
TEMPERATURES ARE FORECAST FOR THE PLAINS TO OHIO VALLEY...  
 
AN UPPER-LEVEL TROUGH CENTERED OVER THE MIDWEST AND OHIO VALLEY,  
AMPLE MOISTURE AHEAD OF THE TROUGH, AND A SLOW-MOVING FRONT  
STRETCHING THROUGH THE OHIO AND TENNESSEE VALLEYS BACK INTO THE  
LOWER MISSISSIPPI VALLEY AND SOUTHERN PLAINS WILL COMBINE TO  
PRODUCE INCREASING RAIN CHANCES ACROSS MUCH OF THE EAST THROUGH  
WEDNESDAY. THROUGH MONDAY NIGHT, STORMS ARE FORECAST FOR TEXAS AND  
THE LOWER MISSISSIPPI VALLEY, AND A SLIGHT RISK OF FLASH FLOODING  
IS IN EFFECT THERE. WIDESPREAD RAIN AND STORMS ARE EXPECTED ON  
TUESDAY AND WEDNESDAY ACROSS THE SOUTHEAST NORTHWARD INTO THE OHIO  
VALLEY AND EASTWARD INTO THE MID-ATLANTIC. THE GREATEST CHANCE OF  
FLASH FLOODING IS IN THE SOUTHEAST INTO THE CAROLINAS, AS WELL AS  
OVER AREAS IN THE NORTHERN MID-ATLANTIC THAT RECEIVED A LOT OF  
RAINFALL RECENTLY. A FEW STRONG STORMS ARE POSSIBLE AS WELL,  
PARTICULARLY FOR THE TENNESSEE VALLEY TO THE CENTRAL APPALACHIANS  
ON TUESDAY.  
 
MONSOONAL MOISTURE WILL CONTINUE TO STREAM INTO THE SOUTHWEST AND  
INTO THE CENTRAL GREAT BASIN OVER THE NEXT COUPLE OF DAYS, SO  
SCATTERED THUNDERSTORMS ARE EXPECTED IN THOSE AREAS. MARGINAL  
RISKS OF FLASH FLOODING ARE IN PLACE THERE THROUGH WEDNESDAY.  
ELSEWHERE, BY TUESDAY EVENING INTO WEDNESDAY, ANOTHER COLD FRONT  
DROPS SOUTHWARD THROUGH THE NORTHERN PLAINS AND MIDWEST, LEADING  
TO SCATTERED THUNDERSTORMS THERE, AS WELL AS A DROP IN  
TEMPERATURES.  
 
THE INTERMOUNTAIN WEST IS FORECAST TO HAVE ABOVE AVERAGE  
TEMPERATURES AGAIN ON TUESDAY AS AN UPPER-LEVEL RIDGE REMAINS  
CENTERED THERE. EXCESSIVE HEAT WARNINGS AND HEAT ADVISORIES ARE IN  
EFFECT FOR THE NORTHERN GREAT PLAINS THROUGH TUESDAY. ON THE OTHER  
HAND, TEMPERATURES BEHIND THE FRONT WILL BE COOLER THAN AVERAGE  
ACROSS THE PLAINS TO OHIO VALLEY, PARTICULARLY ON TUESDAY. RAIN IN  
THE EAST WILL ALSO HOLD TEMPERATURES DOWN BELOW NORMAL THERE.  
 
TATE  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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