800  
FXUS01 KWBC 020649  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
249 AM EDT THU AUG 2 2018  
 
VALID 12Z THU AUG 2 2018 - 12Z SAT AUG 4 2018  
   
..UNSETTLED WEATHER PATTERN CONTINUES ACROSS THE EASTERN U.S.
 
 
...THE HEAT WAVE IS GRADUALLY ABATING ACROSS THE WEST, THOUGH FIRE  
WEATHER CONCERNS REMAIN...  
 
UNSETTLED WEATHER WILL CONTINUE TO BE THE CASE FOR MUCH OF THE  
EASTERN U.S. THROUGH THE END OF THE WORKWEEK, OWING TO A STALLED  
OUT FRONTAL BOUNDARY EXTENDING FROM TEXAS TO THE LOWER GREAT LAKES  
THAT SHOULD EVENTUALLY DISSIPATE BY FRIDAY. THIS IS COUPLED WITH  
A LARGE SCALE UPPER LEVEL TROUGH EXTENDING FROM THE GREAT LAKES TO  
THE MID SOUTH. THE RESPONSE TO THIS IN THE LOW LEVELS WILL BE  
DEEP MOISTURE SURGING NORTHWARD OVER THE EASTERN U.S., AIDED BY  
SOUTHERLY FLOW ON THE WESTERN EDGE OF THE BERMUDA HIGH. IT WILL BE  
WARM AND QUITE HUMID, WITH DAILY CHANCES FOR RAIN FROM THE GULF  
COAST TO NEW ENGLAND. EPISODES OF HEAVY RAIN ARE EXPECTED TO  
MATERIALIZE IN THIS TYPE OF WEATHER PATTERN, LEADING TO THE  
POTENTIAL FOR FLASH FLOODING. FLASH FLOOD WATCHES ARE IN EFFECT  
FROM THE FLORIDA PANHANDLE TO CENTRAL PENNSYLVANIA. IN ADDITION  
TO THE RAINFALL CONCERNS, SOME STRONG TO SEVERE THUNDERSTORMS WILL  
BE POSSIBLE.  
 
THE PERSISTENT UPPER LEVEL RIDGE THAT HAS BEEN IN PLACE ACROSS  
MUCH OF THE WESTERN U.S. IS FORECAST TO BREAK DOWN AS AN UPPER  
LEVEL TROUGH BEGINS IMPINGING ON THE PACIFIC NORTHWEST.  
TEMPERATURES ARE NOT EXPECTED TO BE QUITE AS WARM AS RECENT DAYS,  
BUT THE CONTINUED COMBINATION OF WINDS AND DRY AIR HAS LED TO RED  
FLAG WARNINGS ACROSS PORTIONS OF THE INTERMOUNTAIN WEST, THE  
NORTHERN ROCKIES, AND MUCH OF MONTANA THROUGH AT LEAST THURSDAY.  
POOR AIR QUALITY WILL ALSO BE AN ISSUE FOR SOME OF THESE AREAS,  
INCLUDING THE SOUTHERN PLAINS, ESPECIALLY NEAR ANY ACTIVE  
WILDFIRES.  
 
HAMRICK/WIX  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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