824  
FXUS01 KWBC 230753  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
352 AM EDT MON JUL 23 2018  
 
VALID 12Z MON JUL 23 2018 - 12Z WED JUL 25 2018  
 
...MODERATE RISK OF FLASH FLOODING POSSIBLE ACROSS THE  
MID-ATLANTIC AND NORTHEAST TODAY AND TUESDAY...  
 
...DANGEROUS HEAT TO CONTINUE ACROSS THE SOUTHERN CENTRAL AND  
PORTIONS OF THE WESTERN U.S...  
 
AN UPPER LOW WILL BRING COPIOUS AMOUNTS OF MOISTURE ACROSS THE  
EAST COAST--AND COMBINING THIS WITH A FRONTAL BOUNDARY DRAPED  
ACROSS THE CAROLINAS AND INTO THE MID-ATLANTIC WILL BRING  
UNSETTLED WEATHER THE NEXT FEW DAYS. SHOWERS AND THUNDERSTORMS  
WILL GIVE WAY TO HEAVY RAINFALL THROUGHOUT THE SHORT TERM PERIOD.  
BECAUSE OF THE RECENT HEAVY RAINFALL ACTIVITY, ANY MORE ACTIVITY  
WILL EXACERBATE CONDITIONS. THUS, A MODERATE RISK OF FLASH  
FLOODING WILL BE POSSIBLE ACROSS THE MID-ATLANTIC AND THE  
NORTHEAST TODAY AND TUESDAY.  
 
DANGEROUS HEAT REMAINS IN PLACE ACROSS THE SOUTHERN PLAINS, LOWER  
MISSISSIPPI VALLEY, AND MUCH OF THE SOUTHWEST AND FAR WESTERN  
UNITED STATES. THIS HEAT IS EXPECTED TO REMAIN IN PLACE TODAY  
ACROSS THE SOUTHERN PLAINS AND LOWER MISSISSIPPI VALLEY--WITH  
TEMPERATURES DIPPING INTO THE MID TO LOW 90S BY TUESDAY. HOWEVER,  
THE RIO GRANDE VALLEY WILL CONTINUE TO BE VERY WARM WITH HIGH  
TEMPERATURES IN THE MID TO UPPER 100S. THE WESTERN U.S. WILL  
EXPERIENCE THE OPPRESSIVE HEAT THROUGH AT LEAST THE SHORT TERM  
PERIOD. EXCESSIVE HEAT WATCHES, WARNINGS AND HEAT ADVISORIES ARE  
CURRENTLY IN PLACE ACROSS THESE REGIONS. BY TUESDAY, THE DESERT  
SOUTHWEST WILL SEE TEMPERATURES CLIMB WELL ABOVE 110 DEGREES--WITH  
PLACES LIKE PHOENIX, AZ FORECAST TO REACH 117 DEGREES, LAS VEGAS,  
NV FORECAST TO REACH 114 DEGREES.  
 
A FRONTAL SYSTEM WILL SWEEP ACROSS THE MISSISSIPPI VALLEY AND  
CENTRAL PLAINS TODAY AND BRING SHOWERS AND THUNDERSTORMS ALONG ITS  
BOUNDARY. MEANWHILE, A PLUME OF DEEP MOISTURE WILL EXTEND FROM THE  
WESTERN GULF OF MEXICO INTO COLORADO AND NEW MEXICO. THUNDERSTORMS  
ARE EXPECTED THROUGHOUT THE SHORT TERM PERIOD--WITH HIGHEST  
COVERAGE IN THE LATE AFTERNOON/EARLY EVENING. A SLIGHT RISK OF  
FLASH FLOODING IS POSSIBLE PARTICULARLY IN FAVORABLE TERRAIN. IN  
ADDITION, THE SIERRA NEVADA MOUNTAINS CAN ALSO EXPECT DIURNALLY  
DRIVEN THUNDERSTORMS--WHERE A MARGINAL RISK OF FLASH FLOODING IS  
POSSIBLE. ELSEWHERE, SHOWERS AND THUNDERSTORMS IN NORTHWEST  
FLORIDA WILL BE POSSIBLE TODAY AND TUESDAY. SOME OF THESE  
THUNDERSTORMS COULD MOVE QUITE SLOWLY AND PRODUCE HEAVY  
DOWNPOURS--LEADING TO A MARGINAL RISK OF FLASH FLOODING FOR TODAY.  
 
REINHART  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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