352  
FXUS01 KWBC 130802  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
401 AM EDT WED JUN 13 2018  
 
VALID 12Z WED JUN 13 2018 - 12Z FRI JUN 15 2018  
 
...SEVERE THUNDERSTORMS ARE POSSIBLE ACROSS THE NORTHEAST TODAY  
AND LIKELY ACROSS THE NORTHERN PLAINS THURSDAY MAD FRIDAY...  
 
...HEAVY RAIN AND FLASH FLOODING POSSIBLE FOR PORTIONS OF THE  
CENTRAL U.S. AND THE LOWER OHIO VALLEY TODAY, UPPER MIDWEST  
THURSDAY AND FRIDAY AND SOUTHERN ARIZONA ON FRIDAY...  
 
...HEAT WAVE TO CONTINUE FOR PORTIONS OF THE SOUTHWEST WITH A  
WARMING TREND EXPECTED ACROSS THE INTERMOUNTAIN WEST AND THE  
CENTRAL U.S....  
 
SCATTERED SHOWERS AND THUNDERSTORMS WILL PERSISTED ACROSS MUCH OF  
THE CENTRAL PLAINS, THE DEEP SOUTH AND THE OHIO VALLEY AHEAD OF A  
FRONTAL BOUNDARY TRACKING SLOWLY TO THE EAST. THIS BOUNDARY WILL  
PROVIDE A FOCUS FOR HEAVIER RAINFALL AND STRONG TO SEVERE  
THUNDERSTORMS, PARTICULARLY ACROSS PORTIONS OF THE LOWER OHIO  
VALLEY AND THE CENTRAL PLAINS. SLOW STORM MOVEMENT WILL INCREASE  
THE THREAT FOR HEAVY RAINFALL AND FLOODING. WPC HAS SLIGHT RISKS  
FOR EXCESSIVE RAINFALL/FLASH FLOODING HIGHLIGHTED ACROSS THESE  
REGIONS TODAY. STRONG TO SEVERE THUNDERSTORMS WILL BE POSSIBLE FOR  
MUCH OF THE NORTHEAST. THE STORM PREDICTION CENTER IS HAS A SLIGHT  
RISK FOR SEVERE WEATHER FOR THIS SECTOR OF THE U.S.  
 
A FRONTAL SYSTEM WILL CROSS THROUGH THE ROCKIES AND EXIT INTO THE  
NORTHERN HIGH PLAINS OVER THE NEXT FEW DAYS WHICH WILL PROVIDE  
FOCUS FOR STRONG CONVECTION ACROSS THE NORTHERN PLAINS. THE STORM  
PREDICTION CENTER HAS MUCH OF NORTH DAKOTA AND WESTERN MINNESOTA  
IN A SLIGHT RISK WITH AN ENHANCED RISK OVER CENTRAL NORTH DAKOTA  
THROUGH FRIDAY. PLEASE REFER TO THE SPC WEBPAGE FOR ADDITIONAL  
INFORMATION ON THE RISQUE FOR SEVERE WEATHER.  
 
PERSISTENT RIDGING IN THE UPPER LEVELS WILL KEEP SUMMER HEAT  
LOCKED IN ACROSS THE SOUTHWEST WITH AFTERNOON HIGHS IN THE 90S AND  
LOW 100S LIKELY THROUGH WEDNESDAY. THESE VALUES ARE AS MUCH AS 10  
DEGREES ABOVE NORMAL FOR THIS TIME OF THE YEAR, AND EXCESSIVE HEAT  
WARNINGS ARE IN EFFECT ACROSS PARTS OF SOUTHERN ARIZONA, EASTERN  
CALIFORNIA AND FAR SOUTHERN NEVADA. TEMPERATURES ARE EXPECTED TO  
MODERATE TO NEAR OR BELOW NORMAL BY THURSDAY AS THE UPPER RIDGING  
SHIFTS EASTWARD. ELSEWHERE, TEMPERATURES ACROSS THE CENTRAL U.S.  
AND INTERMOUNTAIN WEST WILL ALSO BE 10 TO 15 DEGREES ABOVE NORMAL  
AHEAD OF A FRONTAL BOUNDARY ENTERING THE PACIFIC NORTHWEST BY  
WEDNESDAY. MOISTURE FROM HURRICANE BUD IS MAKING ITS WAY NORTHWARD  
THROUGH WESTERN MEXICO. PORTIONS OF SOUTHERN ARIZONA WILL BEGIN TO  
HAVE RAIN ASSOCIATED WITH THIS TROPICAL SYSTEM BY THURSDAY, WITH  
MORE COVERAGE BY FRIDAY.  
 
CAMPBELL/SANTORELLI  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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