282  
FXUS01 KWBC 050756  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
355 AM EDT THU JUL 5 2018  
 
VALID 12Z THU JUL 5 2018 - 12Z SAT JUL 7 2018  
 
...HEATWAVE ABATES ACROSS THE EASTERN U.S. WHILST BUILDING IN  
INTENSITY FOR THE WESTERN U.S...  
 
EXPECT AREAS OF SHOWERS AND THUNDERSTORMS TO CONTINUE ALONG A COLD  
FRONT AS IT TRACKS SOUTHEASTWARD ACROSS THE GREAT LAKES, OHIO  
VALLEY, AND THE NORTHEAST. BY FRIDAY, MUCH OF THE HEAVY RAINFALL  
THREAT WILL BE FOCUSED ACROSS THE MID-ATLANTIC REGION AS THIS COLD  
FRONT ARRIVES AND INTERACTS WITH THE VERY HUMID AIRMASS IN PLACE.  
THE FRONT WILL ALSO HERALD AN END TO THE RECENT EASTERN U.S. HEAT  
WAVE AS A QUALITY AIRMASS MOVES IN BEHIND THE FRONT IN TIME FOR  
THE WEEKEND, WITH HIGHS IN THE 70S AND 80S AND SIGNIFICANTLY LOWER  
HUMIDITY LEVELS. MEANWHILE, PLENTY OF MOISTURE IS EXPECTED TO  
REMAIN IN PLACE ACROSS MUCH OF THE GULF COAST REGION THROUGH  
FRIDAY AND THIS WILL SUPPORT NUMEROUS SHOWERS AND THUNDERSTORMS  
DURING THE AFTERNOON AND EVENING HOURS.  
 
ACROSS THE WESTERN U.S., THE UPPER LEVEL RIDGE WILL BE BUILDING  
AND A BIG HEAT WAVE IS COMING TO THE DESERT SOUTHWEST OVER THE  
NEXT COUPLE OF DAYS. HIGH TEMPERATURES ARE EXPECTED TO REACH INTO  
THE 110S OVER THE LOWER ELEVATIONS OF SOUTHERN CALIFORNIA,  
SOUTHERN NEVADA AND ARIZONA AS THE UPPER LEVEL RIDGE BUILDS OVER  
THE REGION. THIS WILL INCREASE THE POTENTIAL FOR WILDFIRE  
CONDITIONS GIVEN THE VERY LOW RELATIVE HUMIDITIES. MOST OF THE  
WEST SHOULD GENERALLY STAY DRY GOING INTO THE EARLY PART OF THE  
WEEKEND, BUT THERE WILL GRADUALLY BE SOME MONSOONAL MOISTURE AT  
LEAST ATTEMPTING TO LIFT UP ACROSS THE FOUR CORNERS REGION BY  
SATURDAY. AS A RESULT, ISOLATED TO SCATTERED AFTERNOON STORMS  
WILL BE POSSIBLE OVER THE SOUTHERN ROCKIES.  
 
D. HAMRICK  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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