035  
FXUS01 KWBC 252001  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
401 PM EDT WED JUL 25 2018  
 
VALID 00Z THU JUL 26 2018 - 00Z SAT JUL 28 2018  
 
...HEAVY RAINS WILL CONTINUE TO RAISE FLOODING CONCERNS ACROSS  
PORTIONS OF THE MID-ATLANTIC AND NORTHEAST THROUGH THURSDAY  
MORNING...  
 
...STRONG TO SEVERE THUNDERSTORMS POSSIBLE FOR PORTIONS OF THE  
NORTHERN AND CENTRAL PLAINS TO THE UPPER MIDWEST...  
 
...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...  
 
SCATTERED TO WIDESPREAD SHOWERS AND THUNDERSTORMS HAVE DEVELOPED  
OVER MUCH OF THE MID-ATLANTIC AND NORTHEAST REGIONS AS A DEEP  
LAYER OF MOISTURE STREAMS NORTHWARD OF AN ADVANCING COLD FRONT.  
THIS SYSTEM IS EXPECTED TO STALL ALONG THE EAST COAST, WHICH WILL  
CONTINUE TO BE A FOCUS FOR ORGANIZED CONVECTION THROUGH THE END OF  
THE WEEK. SLOW STORM MOVEMENT, ALONG WITH THE NEARLY CONTINUOUS  
MOISTURE FEED, WILL SET THE STAGE FOR WIDESPREAD HEAVY RAIN  
AMOUNTS THAT RESULTS IN FLOODING. MUCH OF THE MID-ATLANTIC IS  
WATER-LOGGED FROM MULTIPLE DAYS OF HEAVY RAIN PRIOR TO THIS EVENT  
AND ANY ADDITIONAL RAINFALL WILL EXACERBATE THE SITUATION. WPC HAS  
MUCH OF THIS REGION IN A SLIGHT RISK, WITH MODERATE AND HIGH  
OUTLOOKS IN AFFECT FROM CENTRAL MARYLAND TO SOUTH-CENTRAL NEW YORK.  
 
A COLD FRONT WILL PASS THROUGH THE NORTHERN/CENTRAL PLAINS AND  
LIFT TO THE NORTHEAST THROUGH THE GREAT LAKES REGION. SHOWERS AND  
THUNDERSTORMS WILL ACCOMPANY THE FRONT - SOME OF THESE STORMS  
COULD BE STRONG TO SEVERE--THUS, THE STORM PREDICTION CENTER HAS  
HIGHLIGHTED A SLIGHT RISK FOR THESE REGIONS. BY THURSDAY, THE  
SHOWERS AND THUNDERSTORMS ALONG THE COLD FRONT WILL MOVE TOWARD  
THE LOWER GREAT LAKES AND THE OHIO VALLEY.  
 
HOT AND DRY CONDITIONS WILL PERSIST ACROSS MUCH OF THE SOUTHWEST  
AND PARTS OF THE WESTERN U.S. NUMEROUS EXCESSIVE HEAT WARNINGS AND  
HEAT ADVISORIES REMAIN IN EFFECT THROUGH AT LEAST THURSDAY.  
FORECAST HIGHS WILL BE NEAR OR ABOVE TRIPLE DIGITS. PORTIONS OF  
THE SOUTHERN/CENTRAL ROCKIES WILL HAVE AN INCREASE RISK FOR  
EXCESSIVE RAINFALL AND FLASH FLOODING- THUNDERSTORMS COULD PRODUCE  
FLASH FLOODING ESPECIALLY OVER FAVORED TERRAIN AND RECENT BURN  
SCARS.  
 
CAMPBELL/REINHART  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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