944  
FXUS01 KWBC 242006  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
404 PM EDT MON SEP 24 2018  
 
VALID 00Z TUE SEP 25 2018 - 00Z THU SEP 27 2018  
 
...A WET PATTERN IS EXPECTED TO CONTINUE OVER THE EASTERN HALF OF  
THE COUNTRY WHILE DRY CONDITIONS WILL PERSIST IN THE WESTERN  
U.S....  
 
...STRONG TO POSSIBLY SEVERE THUNDERSTORMS EXPECTED FROM THE  
MIDWEST TO THE GREAT LAKES TUESDAY AND WEDNESDAY AHEAD OF A STRONG  
COLD FRONT...  
 
...THREAT OF EXCESSIVE RAIN OVER THE OHIO VALLEY SHOULD GRADUALLY  
DIMINISH ON TUESDAY...  
 
THE UPPER-LEVEL PATTERN ACROSS THE U.S. CONTINUES TO FAVOR A WET  
PATTERN OVER THE EASTERN HALF OF THE COUNTRY FOR THE NEXT COUPLE  
OF DAYS, WHILE DRY CONDITIONS WILL PERSIST IN THE WESTERN U.S.  
TROPICAL MOISTURE ASSOCIATED WITH A DISSIPATING LOW PRESSURE  
SYSTEM IN THE SOUTHERN PLAINS WILL BE LIFTED NORTHEASTWARD INTO  
THE OHIO VALLEY WHERE HEAVY RAIN COLD LEAD TO FLASH FLOODING  
THROUGH TONIGHT. AS THE ASSOCIATED WARM FRONT LIFTS FURTHER  
NORTHEASTWARD ON TUESDAY, THE FOCUS OF HEAVY RAIN WILL SHIFT INTO  
NEW ENGLAND AS THE RAIN BECOMES MORE SCATTERED IN NATURE OVER THE  
OHIO AND TENNESSEE VALLEYS OUT TO THE NORTHERN MID-ATLANTIC. COOL  
AND DAMP AIR WILL INITIALLY BE TRAPPED ALONG THE EAST COAST UNDER  
A SURFACE HIGH PRESSURE RIDGE. BUT AS THE WARM FRONT LIFTS  
STEADILY NORTHEASTWARD THROUGH NEW ENGLAND TUESDAY NIGHT, SUMMERY  
HEAT AND HUMIDITY SHOULD RETURN TO MUCH OF THE EAST COAST ON  
WEDNESDAY.  
 
A STRONG COLD FRONT IS FORECAST TO SWEEP ACROSS THE CENTRAL PLAINS  
AND SHOULD REACH THE OHIO VALLEY AND THE SOUTHERN PLAINS EARLY ON  
WEDNESDAY. THUNDERSTORMS COULD BECOME SEVERE FROM THE MIDWEST TO  
THE GREAT LAKES TUESDAY AND WEDNESDAY AHEAD OF THE FRONT. MUCH  
COOLER AIR FROM CANADA WILL THEN POUR INTO THE PLAINS BEHIND THE  
STRONG COLD FRONT, WITH MUCH BELOW NORMAL TEMPERATURES REACHING  
THE SOUTHERN PLAINS ON WEDNESDAY.  
 
MEANWHILE, MAINLY DRY CONDITIONS ARE EXPECTED TO PERSIST ACROSS  
THE WESTERN U.S. WITH AN ELEVATED TO CRITICAL FIRE DANGER FORECAST  
FOR PORTIONS OF THE GREAT BASIN, THE CENTRAL ROCKIES, AND NORTHERN  
CALIFORNIA. PLEASE REFER TO THE STORM PREDICTION CENTER FOR  
FURTHER DETAILS ON THE FIRE THREAT.  
 
ELSEWHERE, SOME MIXED PRECIPITATION CAN BE EXPECTED OVER THE HIGH  
ELEVATIONS ACROSS THE NORTHERN ROCKIES TONIGHT INTO EARLY ON  
TUESDAY NEAR A STATIONARY FRONT.  
 
KONG  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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