845  
FXUS01 KWBC 270741  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
340 AM EDT FRI JUL 27 2018  
 
VALID 12Z FRI JUL 27 2018 - 12Z SUN JUL 29 2018  
 
...SEVERE THUNDERSTORMS POSSIBLE ACROSS PORTIONS OF THE  
MID-ATLANTIC AND THE NORTHEAST ON FRIDAY...  
 
...FLASH FLOODING AND SEVERE WEATHER POSSIBLE FOR PORTIONS OF THE  
CENTRAL PLAINS...  
 
...DANGEROUS HEAT TO CONTINUE ACROSS THE SOUTHWEST AND CALIFORNIA  
THROUGH SATURDAY...  
 
AFTER A BRIEF BREAK IN THE RELENTLESS RAINS ACROSS THE EASTERN  
U.S. THE PAST FEW DAYS, EXPECT SHOWERS AND THUNDERSTORMS TO RETURN  
ON FRIDAY AHEAD OF AN APPROACHING COLD FRONT. WITH HEAT AND  
HUMIDITY STILL IN PLACE ACROSS THIS REGION, DEVELOPING STORMS MAY  
BE CAPABLE OF PRODUCING SEVERE WEATHER AND THE STORM PREDICTION  
CENTER HAS HIGHLIGHTED PORTIONS OF THE MID-ATLANTIC AND NORTHEAST  
WITHIN A SLIGHT RISK. GIVEN THE VERY WET ANTECEDENT CONDITIONS  
ACROSS THIS REGION, ANY KIND OF HEAVY RAINFALL WOULD ALSO RAISE  
THE RISK FOR FLASH FLOODING, AND ACCORDINGLY, WPC HAS PLACED THIS  
REGION WITHIN A SLIGHT RISK ON THE DAY 1 EXCESSIVE RAINFALL  
OUTLOOK GRAPHIC. IN ADDITION, THE SOUTHERN PORTION OF THIS FRONT  
WILL LINGER ACROSS THE SOUTHEAST RESULTING IN A DAILY CHANCE FOR  
SHOWERS AND STORMS INTO THE WEEKEND ACROSS THE CAROLINAS, THE DEEP  
SOUTH, AND FLORIDA.  
 
MULTIPLE DISTURBANCES IN THE UPPER LEVELS WILL INTERACT WITH A  
STATIONARY FRONTAL BOUNDARY FROM THE CENTRAL/SOUTHERN PLAINS BACK  
INTO THE CENTRAL ROCKIES RESULTING IN WIDESPREAD SHOWERS AND  
THUNDERSTORMS ACROSS THE CENTRAL PLAINS FRIDAY INTO SATURDAY. WITH  
PLENTY OF MOISTURE AND INSTABILITY IN PLACE, STORMS WILL BE  
CAPABLE OF PRODUCING SEVERE WEATHER AND HEAVY TO EXCESSIVE  
RAINFALL. THE STORM PREDICTION CENTER HAS HIGHLIGHTED PORTIONS OF  
THE CENTRAL HIGH PLAINS WITHIN A SLIGHT TO ENHANCED RISK FOR  
SEVERE WEATHER. LARGE HAIL AND DAMAGING WINDS ARE THE PRIMARY  
THREATS, BUT AN ISOLATED TORNADO OR TWO CANNOT BE RULED OUT  
EITHER. WPC HAS ALSO HIGHLIGHTED PORTIONS OF THIS SAME REGION AS  
WELL AS INTO OKLAHOMA WITHIN A MARGINAL TO SLIGHT RISK FOR  
EXCESSIVE RAINFALL/FLASH FLOODING ON FRIDAY AND SATURDAY.  
 
A DANGEROUS HEAT WAVE WILL CONTINUE OUT WEST THROUGH SATURDAY  
UNDERNEATH OF A STUBBORN UPPER LEVEL RIDGE. TEMPERATURES ACROSS  
PORTIONS OF THE DESERT SOUTHWEST AND CENTRAL CALIFORNIA ARE  
FORECAST TO BE IN THE TRIPLE DIGITS, WHICH IS AS MUCH AS 5 TO 10  
DEGREES ABOVE NORMAL. EXCESSIVE HEAT WARNINGS AND HEAT ADVISORIES  
REMAIN IN EFFECT ACROSS INTERIOR AND SOUTHERN CALIFORNIA, FAR  
NORTHWEST ARIZONA, AND SOUTHERN NEVADA. BECAUSE OF THE VERY HOT  
AND DRY CONDITIONS, FIRE WEATHER AND POOR AIR QUALITY WILL ALSO  
REMAIN A CONCERN ACROSS THE WESTERN U.S..  
 
SANTORELLI  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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