098  
FXUS01 KWBC 230800  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
400 AM EDT SUN SEP 23 2018  
 
VALID 12Z SUN SEP 23 2018 - 12Z TUE SEP 25 2018  
 
...HEAVY TO EXCESSIVE RAINFALL POSSIBLE FROM THE LOWER MISSISSIPPI  
VALLEY TO THE MID-ATLANTIC...  
 
...ELEVATED TO CRITICAL FIRE WEATHER THREAT CONTINUES ACROSS THE  
CENTRAL GREAT BASIN AND THE CENTRAL ROCKIES...  
 
EXPECT ROUNDS OF HEAVY RAINFALL TO CONTINUE THE NEXT FEW DAYS  
ALONG A NEARLY STATIONARY FRONTAL BOUNDARY DRAPED FROM THE LOWER  
MISSISSIPPI VALLEY TO THE MID-ATLANTIC. THE WPC EXCESSIVE  
RAINFALL/FLASH FLOOD OUTLOOKS PLACE MUCH OF THIS REGION WITHIN A  
SLIGHT RISK ON SUNDAY, WITH A MARGINAL TO SLIGHT RISK CONTINUING  
ON MONDAY AS WELL FOR THE OHIO VALLEY AND CENTRAL APPALACHIANS.  
SOUTH OF THIS BOUNDARY, THE THREAT FOR SHOWERS AND THUNDERSTORMS  
WILL BE POSSIBLE INTO THE EARLY WORK WEEK WITHIN A WARM AND HUMID  
AIRMASS. AND TO THE NORTH, STRONG CANADIAN HIGH PRESSURE SLIDES IN  
WHICH SHOULD KEEP TEMPERATURES NEAR OR BELOW NORMAL ACROSS MUCH OF  
THE NORTHEAST THE NEXT COUPLE OF DAYS, WITH A HANDFUL OF FROST  
ADVISORIES AND FREEZE WARNINGS IN EFFECT FOR PORTIONS OF NORTHERN  
NEW ENGLAND.  
 
ELEVATED TO CRITICAL FIRE WEATHER CONCERNS WILL CONTINUE THIS WEEK  
ACROSS MUCH OF THE CENTRAL GREAT BASIN/INTERMOUNTAIN WEST AND INTO  
THE CENTRAL ROCKIES WHERE TEMPERATURES ARE EXPECTED TO BE WELL  
ABOVE NORMAL AND HUMIDITY LEVELS REMAIN LOW. AS A RESULT, NUMEROUS  
RED FLAG WARNINGS ARE IN EFFECT ACROSS PORTIONS OF NEVADA, UTAH,  
AND WYOMING.  
 
AN UPPER LEVEL SYSTEM MOVING ACROSS THE NORTHWEST TODAY MAY BRING  
SOME LIGHT AND SCATTERED SHOWERS TO PORTIONS OF THE NORTHERN  
ROCKIES AND NORTHERN HIGH PLAINS. ONCE THIS SYSTEM PUSHES INTO THE  
CENTRAL U.S. BY MONDAY, IT SHOULD TAP INTO ADDITIONAL MOISTURE  
WHICH WOULD INCREASE THE THREAT FOR RAIN AND THUNDERSTORMS ALONG A  
COLD FRONT FROM THE UPPER MIDWEST TO THE CENTRAL PLAINS. MODERATE  
TO LOCALLY HEAVY RAINFALL MAY BE POSSIBLE ON MONDAY AND INTO  
TUESDAY, PARTICULARLY NEAR THE LOW PRESSURE AREA AS IT MOVES  
THROUGH THE UPPER MISSISSIPPI VALLEY AND INTO SOUTHERN CANADA.  
 
SANTORELLI  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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