012  
FXUS01 KWBC 290801  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
400 AM EDT FRI JUN 29 2018  
 
VALID 12Z FRI JUN 29 2018 - 12Z SUN JUL 01 2018  
 
...SEVERE THUNDERSTORMS AND FLASH FLOODING POSSIBLE FROM THE UPPER  
MISSISSIPPI VALLEY TO THE CENTRAL PLAINS FRIDAY AND SATURDAY...  
 
...HOT AND HUMID WEATHER CONTINUES INTO THE WEEKEND ACROSS THE  
MIDWEST AND INTO THE EAST...  
 
...ELEVATED TO CRITICAL FIRE WEATHER CONDITIONS REMAIN OVER THE  
FOUR CORNERS REGION THROUGH THE END OF THE WORKWEEK...  
 
SHOWERS AND THUNDERSTORMS WILL CONTINUE TO DEVELOP TODAY NEAR A  
SURFACE LOW AND ALONG AN ATTENDANT COLD FRONT AS IT PUSHES  
EASTWARD THROUGH THE NORTH CENTRAL U.S. AND INTO THE UPPER MIDWEST  
BY THIS WEEKEND. SOME OF THE STORMS MAY CONTAIN SEVERE WEATHER AND  
HEAVY TO EXCESSIVE RAINFALL, GIVEN PLENTY OF MOISTURE AND  
INSTABILITY PRESENT ALONG THE COLD FRONT. THE STORM PREDICTION  
CENTER HAS HIGHLIGHTED AREAS FROM THE UPPER MISSISSIPPI VALLEY TO  
THE NORTHERN/CENTRAL PLAINS ON FRIDAY WITHIN A SLIGHT RISK FOR  
SEVERE THUNDERSTORMS, WITH THE SLIGHT RISK AREA SHIFTING EASTWARD  
INTO PARTS OF THE UPPER MIDWEST/MIDDLE MISSISSIPPI VALLEY ON  
SATURDAY. MOST OF THESE STORMS SHOULD BE FAIRLY PROGRESSIVE, BUT  
HEAVY RAINFALL WITHIN SOME STORMS MAY BE ENOUGH TO PRODUCE  
ISOLATED FLASH FLOODING, PARTICULARLY ACROSS PORTIONS OF THE UPPER  
MIDWEST ON SATURDAY. ACCORDINGLY, WPC HAS PLACED THIS REGION  
WITHIN A SLIGHT RISK FOR EXCESSIVE RAINFALL/FLASH FLOODING.  
 
STRONG RIDGING ACROSS THE MIDWEST AND INTO THE MID-ATLANTIC AND  
PARTS OF THE NORTHEAST, AHEAD OF THE AFOREMENTIONED SYSTEM, WILL  
CONTINUE TO ALLOW FOR VERY WARM AND HUMID CONDITIONS INTO THE  
WEEKEND. WIDESPREAD EXCESSIVE HEAT WARNINGS AND HEAT ADVISORIES  
ARE IN EFFECT FROM THE CENTRAL PLAINS TO THE WESTERN  
OHIO/TENNESSEE VALLEYS WITH AFTERNOON HIGHS 10 TO 20 DEGREES ABOVE  
NORMAL AND HEAT INDICES EXCEEDING 100 DEGREES POSSIBLE. BOTH  
DAYTIME HIGHS AND OVERNIGHT HIGH MINIMUM TEMPERATURE RECORDS ARE  
POSSIBLE ACROSS THIS REGION.  
 
ELSEWHERE ACROSS THE U.S., HOT, DRY, AND WINDY CONDITIONS WILL  
CREATE AN ELEVATED TO CRITICAL FIRE WEATHER RISK ACROSS THE FOUR  
CORNERS REGION OF THE COUNTRY. WIDESPREAD RED FLAG WARNINGS ARE IN  
EFFECT ACROSS SOUTHERN UTAH AND WESTERN COLORADO. TO THE NORTH,  
BROAD TROUGHING WILL CONTINUE TO SUPPORT SCATTERED SHOWERS AND  
STORMS ACROSS THE NORTHERN ROCKIES AND PARTS OF THE NORTHWEST,  
WHILE SHOWERS AND STORMS ALSO CONTINUE ACROSS THE SOUTHEAST U.S.  
AS UPPER LEVEL ENERGY INTERACTS WITH A WEAKENING FRONTAL BOUNDARY  
AT THE SURFACE.  
 
SANTORELLI  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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