228  
FXUS01 KWBC 240756  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
355 AM EDT TUE JUL 24 2018  
 
VALID 12Z TUE JUL 24 2018 - 12Z THU JUL 26 2018  
 
...MODERATE RISK OF FLASH FLOODING POSSIBLE ACROSS THE  
MID-ATLANTIC AND NORTHEAST THROUGH WEDNESDAY...  
 
...DANGEROUS HEAT TO CONTINUE ACROSS THE SOUTHWEST AND PORTIONS OF  
THE WEST COAST...  
 
...RISK OF HEAVY RAINFALL LEADING TO FLASH FLOODING FOR THE  
CENTRAL/SOUTHERN ROCKIES AND CENTRAL HIGH PLAINS...  
 
THE MID-ATLANTIC AND NORTHEAST WILL CONTINUE TO BE IN THE WET  
PATTERN AS AN UPPER LOW TRANSPORTS TROPICAL MOISTURE ACROSS THESE  
REGIONS. MULTIPLE ROUNDS OF SHOWERS AND THUNDERSTORMS WILL  
CONTINUE TO STREAM ACROSS THE CAROLINAS AND INTO THE  
NORTHEAST--WITH SOME OF THESE STORMS PRODUCING HEAVY RAIN. AS  
SOILS ARE ALREADY SATURATED, ANY MORE RAINFALL WILL EXACERBATE  
THESE CONDITIONS. FOR TODAY, A MODERATE RISK OF FLASH FLOODING  
WILL STRETCH FROM COASTAL NORTH CAROLINA NORTHWARD INTO SOUTHWEST  
NEW YORK. ON WEDNESDAY, THE MODERATE RISK WILL SHIFT INTO THE  
NORTHEAST AND PORTIONS OF NEW ENGLAND. ALTHOUGH RAIN IS STILL  
EXPECTED FOR THE MID-ATLANTIC AND COASTAL NORTH CAROLINA, THE AXIS  
OF HEAVY RAINFALL IS EXPECTED TO BE FARTHER NORTH. THESE AREAS ARE  
STILL UNDER A SLIGHT RISK OF FLASH FLOODING. BY THURSDAY, A COLD  
FRONT WILL SWEEP ACROSS THE EAST COAST--AND WITH IT, SWEEPING THE  
PRECIPITATION OUT OF THESE AREAS.  
 
THE DANGEROUS HEAT THAT HAS PLAGUED THE SOUTHERN PLAINS HAS  
FINALLY ENDED AS HIGH TEMPERATURES HAVE DIPPED BELOW THE CENTURY  
MARK. HOWEVER, THE DESERT SOUTHWEST, PORTIONS OF CALIFORNIA AND  
THE PACIFIC NORTHWEST CONTINUE TO EXPERIENCE THIS STIFLING HEAT  
WAVE THAT WILL EXTEND INTO THE LATE WEEK. EXCESSIVE HEAT WARNINGS  
AND HEAT ADVISORIES HAVE BEEN ISSUED ACROSS THESE AREAS. PLACES  
LIKE PHOENIX, AZ WILL SEE HIGH TEMPERATURES NEAR 117 TODAY AND 115  
ON WEDNESDAY. THE PACIFIC NORTHWEST WILL ALSO SEE TEMPERATURES IN  
THE MID TO UPPER 90S AND EVEN 100 IN SOME PLACES. WITH THESE DRY  
AND HOT CONDITIONS, ELEVATED FIRE WEATHER--WITH CRITICAL FIRE  
WEATHER CONDITIONS FOR A SMALL PORTION NEAR LOS ANGELES, CA--WILL  
BE POSSIBLE ACROSS PORTIONS OF THE WEST COAST.  
 
DEEP MOISTURE WILL BE BROUGHT UP FROM THE WESTERN GULF OF MEXICO  
WHICH WILL HELP FUEL AFTERNOON/EVENING THUNDERSTORMS ACROSS THE  
CENTRAL/SOUTHERN ROCKIES AND CENTRAL HIGH PLAINS. THERE IS A  
MARGINAL RISK OF FLASH FLOODING PARTICULARLY IN FAVORABLE TERRAIN  
TODAY--WITH A SLIGHT RISK OF FLASH FLOODING POSSIBLE FOR THIS AREA  
AND INTO THE CENTRAL HIGH PLAINS. IN ADDITION, THE SIERRA NEVADA  
MOUNTAINS CAN ALSO EXPECT DIURNALLY DRIVEN THUNDERSTORMS--WHERE A  
MARGINAL RISK OF FLASH FLOODING IS POSSIBLE THROUGH WEDNESDAY.  
 
REINHART  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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