020  
FXUS01 KWBC 302000  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
359 PM EDT SAT JUN 30 2018  
 
VALID 00Z SUN JUL 01 2018 - 00Z TUE JUL 03 2018  
 
...SEVERE WEATHER AND FLASH FLOODING POSSIBLE FOR PARTS OF THE  
PLAINS TO THE UPPER GREAT LAKES...  
 
...WIDESPREAD AND DANGEROUS HEAT WAVE TO CONTINUE THROUGH THE  
WEEKEND FOR MUCH OF THE EASTERN HALF OF THE COUNTRY...  
 
THE ONGOING HEAT WAVE IS EXPECTED TO CONTINUE OVER MUCH OF THE  
EASTERN HALF OF THE COUNTRY, WHERE AFTERNOON HIGHS COULD BE AS  
MUCH AS 10 TO 20 DEGREES ABOVE NORMAL. THESE VALUES COMBINED WITH  
HIGH HUMIDITY, WILL LEAD TO DANGEROUS HEAT INDICES APPROACHING OR  
EXCEEDING 100 DEGREES FOR MANY PLACES. DAYTIME MAXIMUM AND  
OVERNIGHT HIGH-MINIMUM TEMPERATURE RECORDS ARE IN JEOPARDY AND  
WIDESPREAD EXCESSIVE HEAT WARNINGS/WATCHES AND HEAT ADVISORIES ARE  
IN EFFECT FROM THE CENTRAL PLAINS TO THE OHIO VALLEY AND PARTS OF  
THE NORTHEAST. ADDITIONALLY, HOT AND DRY CONDITIONS ACROSS  
PORTIONS OF CALIFORNIA AND THE SOUTHWEST WILL KEEP AN ELEVATED  
RISK OF FIRE DANGER IN PLACE. NUMEROUS LOCATIONS HAVE RED FLAG  
WARNINGS IN EFFECT.  
 
A COLD FRONT MOVING SLOWLY EASTWARD AND A SURFACE LOW LIFTING  
THROUGH THE UPPER MIDWEST/GREAT LAKES IS PROVIDING A FOCUS FOR  
STRONG TO SEVERE CONVECTION AND HEAVY TO EXCESSIVE RAINFALL. THE  
STORM PREDICTION CENTER HAS HIGHLIGHTED PORTIONS OF THE EASTERN  
CENTRAL PLAINS TO THE UPPER MIDWEST/GREAT LAKES AND THE NORTHEAST  
WITHIN A SLIGHT TO ENHANCED RISK FOR SEVERE WEATHER. THE PRIMARY  
THREATS WITH THESE STORMS WILL BE WIND AND LARGE HAIL, BUT A FEW  
TORNADOES CANNOT BE RULED OUT. THESE STORMS ARE ALSO EXPECTED TO  
BE VERY EFFICIENT RAIN PRODUCERS, WHICH POTENTIALLY COULD LEAD TO  
FLASH FLOODING.BY SUNDAY, THIS SYSTEM BECOMES A BIT MORE  
PROGRESSIVE AS THE SURFACE LOW RACES NORTHWARD THROUGH THE UPPER  
GREAT LAKES, WHICH SHOULD LIMIT THE OVERALL FLASH FLOOD THREAT,  
BUT SEVERE WEATHER WILL REMAIN A POSSIBILITY ALONG THE COLD FRONT.  
REFER TO THE PRODUCTS ISSUED BY THE STORM PREDICTION CENTER AND  
WPC FOR ADDITIONAL DETAILS. ACROSS THE SOUTHEASTERN U.S., A WEAK  
SURFACE WAVE WILL KEEP SHOWERS AND THUNDERSTORMS IN THE FORECAST,  
WITH HEAVY RAINFALL POSSIBLE.  
 
CAMPBELL/SANTORELLI  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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