876  
FXUS01 KWBC 312005  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
404 PM EDT TUE JUL 31 2018  
 
VALID 00Z WED AUG 01 2018 - 00Z FRI AUG 03 2018  
 
...SHOWERS AND THUNDERSTORMS WILL CONTINUE ACROSS THE EASTERN  
U.S....  
   
..EXCESSIVE HEAT CONTINUES ACROSS THE PACIFIC NORTHWEST
 
 
A COLD FRONT WILL BECOME STALLED FROM THE GULF COAST NORTHEAST  
INTO NEW ENGLAND THROUGH THE THE MAJORITY OF THE WORK WEEK. THIS  
WILL INTERACT WITH AN UPPER LEVEL TROUGH WHICH WILL ALSO BE PARKED  
ACROSS THE SAME AREA, AND PROMOTE INSTABILITY AS WELL AS DEEP  
MOISTURE ACROSS MUCH OF THE EASTERN U.S., AIDED BY EXPANSIVE  
SOUTHERLY FLOW ON THE WESTERN SIDE OF THE BERMUDA HIGH OVER THE  
ATLANTIC OCEAN. SENSIBLE WEATHER WILL FEATURE WARM AND HUMID  
CONDITIONS ALONG THE FRONTAL ZONE AND POINTS EASTWARD, WITH DAILY  
CHANCES FOR RAIN AND THUNDERSTORMS. EPISODES OF HEAVY RAIN ARE  
ALSO EXPECTED IN THIS TYPE OF PATTERN, WITH THE WEATHER PREDICTION  
CENTER HIGHLIGHTING A SLIGHT CHANCE OF EXCESSIVE RAINFALL AND  
FLASH FLOODING ACROSS PORTIONS OF THE DEEP SOUTH AND CENTRAL  
APPALACHIANS TODAY, EXTENDING INTO THE NORTHERN APPALACHIANS FOR  
WEDNESDAY AND THURSDAY. THE STORM PREDICTION CENTER HAS ALSO  
ISSUED A SLIGHT RISK OF SEVERE THUNDERSTORMS FOR PORTIONS OF THE  
MID ATLANTIC AND NORTHEAST FOR WEDNESDAY.  
 
PERSISTENT UPPER LEVEL RIDGING ACROSS THE WESTERN U.S. WILL LEAD  
TO MAINLY DRY CONDITIONS FOR THE PACIFIC NORTHWEST AND MUCH OF THE  
INTERMOUNTAIN WEST. TEMPERATURES ARE EXPECTED TO BE ABOVE NORMAL  
FOR MUCH OF THIS REGION, WITH HEAT ADVISORIES AND EXCESSIVE HEAT  
WARNINGS IN EFFECT ACROSS PARTS OF OREGON, WASHINGTON, AND IDAHO.  
POOR AIR QUALITY WILL ALSO BE AN ISSUE FOR PORTIONS OF THE WEST  
COAST, AS WELL AS PORTIONS OF THE SOUTHWEST AND SOUTHERN PLAINS,  
ESPECIALLY NEAR ANY ACTIVE WILDFIRES. FOR THE SOUTHWESTERN U.S.,  
MONSOONAL MOISTURE IS EXPECTED TO REMAIN ACROSS MUCH OF ARIZONA  
AND NEW MEXICO WITH SCATTERED THUNDERSTORMS DEVELOPING MAINLY  
DURING THE AFTERNOON AND EVENING HOURS.  
 
D. HAMRICK/WIX  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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