708  
FXUS01 KWBC 220759  
PMDSPD  
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
358 AM EDT SUN JUL 22 2018  
 
VALID 12Z SUN JUL 22 2018 - 12Z TUE JUL 24 2018  
 
...HEAVY RAIN AND FLASH FLOODING TO CONTINUE ACROSS THE  
MID-ATLANTIC AND NORTHEAST...  
 
...SEVERE WEATHER AND HEAVY RAIN WILL OCCUR ACROSS THE PLAINS AND  
INTO THE CENTRAL/SOUTHERN ROCKIES...  
 
...UNSETTLED WEATHER EXPECTED ACROSS THE CENTRAL AND EASTERN GULF  
OF MEXICO....  
 
...DANGEROUS HEAT TO CONTINUE ACROSS THE SOUTHERN PLAINS AND  
PORTIONS OF THE WESTERN U.S...  
 
ANOTHER DAY OF HEAVY RAINFALL IS EXPECTED FROM THE OHIO AND  
TENNESSEE VALLEYS INTO THE NORTHEAST. A FRONTAL SYSTEM WILL SLOWLY  
PUSH EASTWARD AND EVENTUALLY STALL TODAY WHICH WILL ACT AS A FOCAL  
POINT FOR SHOWERS AND THUNDERSTORMS. A SLIGHT RISK OF FLASH  
FLOODING IS POSSIBLE FOR THE MID-ATLANTIC TODAY WHERE IT RECEIVED  
AN IMPRESSIVE AMOUNT OF RAINFALL ON SATURDAY. BY MONDAY, ANOTHER  
ROUND OF SHOWERS AND THUNDERSTORMS IS EXPECTED ESPECIALLY FROM THE  
WESTERN CAROLINAS TO THE NORTHEAST. ONCE AGAIN, A SLIGHT RISK OF  
FLASH FLOODING WILL BE POSSIBLE FOR THOSE REGIONS. HEAVY RAINFALL  
WILL ALSO DEVELOP ALONG THE SOUTHERN NORTH CAROLINA COAST ON  
MONDAY; THIS ACTIVITY COULD ALSO YIELD TO FLASH FLOODING.  
 
A FRONTAL SYSTEM WILL SLIDE ACROSS THE NORTHERN HIGH PLAINS  
TODAY--FIRING OFF CONVECTION ALONG THE BOUNDARY. SEVERE WEATHER  
WILL BE POSSIBLE PARTICULARLY FROM NORTH DAKOTA SOUTHWARD INTO  
WESTERN NEBRASKA--WHERE THE STORM PREDICTION CENTER HAS ISSUED A  
SLIGHT RISK. BY MONDAY, A PLUME OF MOISTURE WILL EXTEND INTO THE  
EASTERN HIGH PLAINS OF COLORADO AND NEW MEXICO WHERE FLASH  
FLOODING COULD OCCUR ALONG FAVORABLE TERRAIN. THUNDERSTORMS WILL  
ALSO IMPACT THE CENTRAL GREAT BASIN AND ALONG THE SIERRA NEVADA  
MOUNTAIN RANGE. THESE REGIONS COULD SEE ISOLATED FLASH FLOODING  
FROM THIS CONVECTIVE ACTIVITY.  
 
A FRONTAL BOUNDARY WILL BE DRAPED ACROSS THE SOUTHEAST FOR MOST OF  
THE SHORT TERM PERIOD. COPIOUS AMOUNTS OF MOISTURE FROM THE GULF  
OF MEXICO WILL AID IN PRODUCING HEAVY RAINFALL AND SEVERE WEATHER  
TODAY--ESPECIALLY ALONG THE FLORIDA PANHANDLE SOUTHWARD INTO THE  
TAMPA BAY REGION. A SLIGHT RISK OF SEVERE WEATHER WILL BE  
POSSIBLE ALONG WITH A MARGINAL RISK OF FLASH FLOODING. BY MONDAY,  
THE SLIGHT CHANCE OF SEVERE WEATHER WILL SHIFT WESTWARD ACROSS  
SOUTHEAST LOUISIANA.  
 
DANGEROUS HEAT REMAINS IN PLACE ACROSS THE SOUTHERN PLAINS, LOWER  
MISSISSIPPI VALLEY, AND MUCH OF THE SOUTHWEST AND WESTERN UNITED  
STATES. THIS HEAT IS EXPECTED TO REMAIN IN PLACE THROUGH MONDAY.  
EXCESSIVE HEAT WATCHES, WARNINGS AND HEAT ADVISORIES ARE IN PLACE  
ACROSS THESE REGIONS. HIGH TEMPERATURES WILL REACH WELL OVER THE  
CENTURY MARK ACROSS TEXAS AND OKLAHOMA. THE PACIFIC NORTHWEST WILL  
ALSO CONTINUE TO EXPERIENCE ABOVE NORMAL TEMPERATURES--ESPECIALLY  
BY THE END OF THE WEEKEND WHERE TEMPERATURES COULD REACH THE MID  
TO UPPER 90S AND EVEN REACH OVER 100 IN SOME AREAS. BY TUESDAY,  
THE DESERT SOUTHWEST WILL SEE TEMPERATURES CLIMB WELL ABOVE 110  
DEGREES--WITH PLACES LIKE PHOENIX, AZ POSSIBLY REACHING TO 117.  
 
REINHART  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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