335  
FXUS01 KWBC 040758  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
357 AM EDT WED JUL 04 2018  
 
VALID 12Z WED JUL 04 2018 - 12Z FRI JUL 06 2018  
 
...SEVERE WEATHER POSSIBLE ACROSS PARTS OF THE UPPER MISSISSIPPI  
VALLEY INTO THE CENTRAL PLAINS TODAY...  
 
...HEAT WAVE TO CONTINUE THROUGH THE JULY 4TH HOLIDAY FOR THE  
EASTERN AND MIDWESTERN STATES, EVENTUALLY BUILDING WESTWARD INTO  
THE SOUTHWEST BY THE END OF THE WEEK...  
 
EXPECT SHOWERS AND THUNDERSTORMS TO CONTINUE ALONG A COLD FRONT AS  
IT PRESSES EASTWARD THROUGH THE NORTHERN TIER AND THE UPPER  
MIDWEST/GREAT LAKES THROUGH THURSDAY. SEVERE THUNDERSTORMS AND  
LOCALLY HEAVY RAINFALL ARE POSSIBLE TODAY, AND SPC HAS HIGHLIGHTED  
PORTIONS OF THE UPPER MISSISSIPPI VALLEY TO THE CENTRAL PLAINS  
WITHIN A SLIGHT RISK FOR SEVERE THUNDERSTORMS. SCATTERED SHOWERS  
AND STORMS WILL ALSO BE POSSIBLE ALONG AND SOUTH OF A  
QUASI-STATIONARY FRONT ACROSS THE UPPER OHIO VALLEY AND THE LOWER  
GREAT LAKES. WET WEATHER CONTINUES THURSDAY AND INTO FRIDAY FROM  
THE NORTHEAST TO THE OHIO VALLEY AND BACK INTO THE MIDDLE  
MISSISSIPPI VALLEY AS THE WHOLE SYSTEM SAGS SOUTH AND EASTWARD.  
 
PLENTY OF MOISTURE STREAMING INTO THE DEEP SOUTH THE NEXT FEW DAYS  
WILL KEEP THE CHANCE FOR SHOWERS AND STORMS IN THE FORECAST ACROSS  
MUCH OF THE SOUTHEAST AND THE GULF COAST REGIONS. A CONVECTIVE LOW  
PRESSURE SYSTEM MOVING SLOWLY WESTWARD ACROSS THE CENTRAL GULF  
COAST THROUGH TOMORROW WILL HELP TO ENHANCE SHOWERS AND STORMS  
FROM SOUTHERN MISSISSIPPI TO SOUTHEAST TEXAS, WHERE LOCALLY HEAVY  
RAINFALL AND ISOLATED FLASH FLOODING WILL BE POSSIBLE.  
 
THE ONGOING HEAT WAVE ACROSS THE EASTERN U.S. WILL CONTINUE  
THROUGH THE JULY 4TH HOLIDAY, WITH HEAT REBUILDING ACROSS THE  
CENTRAL PLAINS AND THE MIDWEST AS WELL. HEAT ADVISORIES AND HEAT  
WARNINGS ARE IN EFFECT FOR MUCH OF THE MIDWESTERN STATES AS WELL  
AS PORTIONS OF THE NORTHEAST. AFTERNOON HIGHS IN THE 90S WILL  
COMBINE WITH OPPRESSIVE DEW POINT TEMPERATURES, RESULTING IN  
DANGEROUS HEAT INDICES EXCEEDING 100 DEGREES IN SOME PLACES.  
UNCOMFORTABLY WARM AND HUMID CONDITIONS WILL CONTINUE OVERNIGHT AS  
WELL WITH NEAR OR EXCEEDING RECORD BREAKING HIGH MINIMUMS  
POSSIBLE. THE UPPER LEVEL RIDGE RESPONSIBLE FOR THIS HEAT WAVE  
SHOULD FINALLY START TO WEAKEN BY THURSDAY INTO FRIDAY ACROSS THE  
EAST, BUT WILL CONTINUE BUILDING WESTWARD INTO THE GREAT BASIN AND  
THE SOUTHWEST WHERE EXCESSIVE HEAT WATCHES ARE IN EFFECT FOR  
PORTIONS OF THIS REGION STARTING ON FRIDAY. IN ADDITION TO THE  
HEAT, DRY CONDITIONS ACROSS THE WESTERN U.S. WILL RESULT IN  
POSSIBLE FIRE WEATHER CONDITIONS ACROSS MUCH OF THE CENTRAL GREAT  
BASIN REGION. RED FLAG WARNINGS ARE IN EFFECT FOR SOME LOCATIONS.  
 
SANTORELLI  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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