616  
FXUS01 KWBC 261942  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
342 PM EDT THU JUL 26 2018  
 
VALID 00Z FRI JUL 27 2018 - 00Z SUN JUL 29 2018  
   
..HEAVY RAINS TO IMPACT FAR NORTHERN NEW ENGLAND
 
 
...RISK OF FLASH FLOODING AND SEVERE WEATHER FOR THE  
CENTRAL/SOUTHERN ROCKIES AND CENTRAL HIGH PLAINS INTO THIS  
WEEKEND...  
 
...DANGEROUS HEAT TO CONTINUE ACROSS THE SOUTHWEST AND ALONG THE  
WEST COAST THROUGH FRIDAY...  
 
THE HEAVY RAIN THAT HAS PLAGUED THE MID-ATLANTIC HAS FINALLY MOVED  
OFF SHORE AND DRY CONDITIONS HAVE SETTLED IN DURING THE DAY TODAY.  
MEANWHILE, THE NORTHERN EXTENT OF THE COLD FRONT HAS NOW MOVED  
INTO NEW ENGLAND, AND IS RESULTING IN HEAVY RAIN AND THUNDERSTORMS  
ACROSS THIS AREA. A SLIGHT RISK OF FLASH FLOODING WILL BE POSSIBLE  
THROUGH TONIGHT, MAINLY ACROSS MAINE, WITH PRECIPITATION QUICKLY  
TAPERING OFF BY DAWN AS THE COLD FRONT CONTINUES EASTWARD IN THIS  
AREA. ON THE OTHER HAND, THE SOUTHERN EXTENT OF THE FRONT HAS  
BECOME STALLED AND WILL REMAIN IN PLACE ALONG SOUTHEAST COASTLINE,  
RESULTING IN CONTINUED CHANCES FOR SHOWERS AND THUNDERSTORMS IN  
THESE AREAS.  
 
ANOTHER ROUND OF SHOWERS AND THUNDERSTORMS WILL OCCUR ALONG A  
SECONDARY COLD FRONT ORIGINATING FROM THE UPPER GREAT LAKES  
REGION, AND EXTENDING SOUTHEAST INTO THE SOUTHERN PLAINS. THIS  
FRONT WILL CONTINUE TO TRACK SOUTH AND EAST, EVENTUALLY TAKING  
OVER THE CURRENT COASTAL FRONT AS IT STALLS AND WEAKENS. THE STORM  
PREDICTION CENTER HAS OUTLINED PORTIONS OF THE LOWER GREAT LAKES  
AND NORTHERN OHIO VALLEY AS BEING IN A SLIGHT RISK OF SEVERE  
THUNDERSTORMS THIS AFTERNOON THROUGH OVERNIGHT. SHOWER AND  
THUNDERSTORM POTENTIAL WILL THEN SHIFT EASTWARD WITH THE FRONT,  
IMPACTING MUCH OF THE MID-ATLANTIC AND NEW ENGLAND YET AGAIN FOR  
FRIDAY AND FRIDAY NIGHT. THE STORM PREDICTION CENTER HAS INCLUDED  
MUCH OF THIS REGION IN A SLIGHT RISK FOR SEVERE THUNDERSTORMS FOR  
FRIDAY AS WELL, WHILE THE WEATHER PREDICTION CENTER HAS OUTLINED A  
MARGINAL RISK OF EXCESSIVE RAIN AND FLASH FLOODING ACROSS PORTIONS  
OF NEW YORK AND PENNSYLVANIA DURING THIS TIME.  
 
THE CENTRAL AND SOUTHERN ROCKIES WILL CONTINUE TO RECEIVE ROUNDS  
OF HEAVY SHOWERS AND THUNDERSTORMS OVER THE NEXT FEW DAYS. SOME OF  
THESE STORMS COULD BE SEVERE AND COULD PRODUCE HEAVY RAINFALL THAT  
MAY LEAD TO FLASH FLOODING--ESPECIALLY OVER FAVORED TERRAIN AND  
RECENT BURN SCARS. FOR THE REST OF TODAY AND INTO THE OVERNIGHT,  
THE BEST THREAT OF EXCESSIVE RAINFALL AND SEVERE THUNDERSTORMS  
WILL CONTINUE TO CONCENTRATE ACROSS THE EASTERN SLOPES OF THE  
SOUTHERN AND CENTRAL ROCKIES. BY FRIDAY, THIS THREAT WILL SHIFT  
INTO THE CENTRAL HIGH PLAINS WHERE IT WILL REMAIN THROUGH  
SATURDAY. THE STORM PREDICTION CENTER HAS OUTLINED A SLIGHT RISK  
OF SEVERE THUNDERSTORMS FOR TODAY, AND HAS INCREASED TO AN  
ENHANCED RISK OF SEVERE THUNDERSTORMS ACROSS THE WESTERN CENTRAL  
PLAINS FOR FRIDAY.  
 
THE DANGEROUS HEAT WILL PERSEVERE THROUGH AT LEAST FRIDAY AS  
TEMPERATURES ACROSS THE SOUTHWEST, CALIFORNIA AND PARTS OF THE  
PACIFIC NORTHWEST CONTINUE TO BE WELL ABOVE AVERAGE. AREAS IN THE  
SOUTHWEST AND SOUTHERN CALIFORNIA CAN EXPECT HIGH TEMPERATURES  
NEAR AND ABOVE 110 DEGREES. EXCESSIVE HEAT WARNINGS AND HEAT  
ADVISORIES REMAIN IN EFFECT FOR THESE REGIONS, AND WILL ALSO LEAD  
TO AIR QUALITY CONCERNS, ESPECIALLY IN THE HIGHER POPULATED AREAS.  
BECAUSE OF THESE HOT AND DRY CONDITIONS, FIRE WEATHER WILL ALSO  
REMAIN A CONCERN ACROSS THE WESTERN U.S.  
 
WIX  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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