273  
FXUS01 KWBC 091949  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
349 PM EDT SUN SEP 09 2018  
 
VALID 00Z MON SEP 10 2018 - 00Z WED SEP 12 2018  
 
...HEAVY RAIN AND FLOODING TO CONTINUE FOR PARTS OF THE UPPER OHIO  
VALLEY INTO PENNSYLVANIA AND NEW YORK THROUGH MONDAY...  
 
...HEAVY RAIN POSSIBLE OVER PARTS OF THE WESTERN GULF COAST  
STATES...  
 
...COOL AND WET CONDITIONS FOR THE PACIFIC NORTHWEST INTO THE  
MIDDLE OF THE WEEK...  
 
COOL AND WET CONDITIONS WILL REMAIN FOR THE UPPER OHIO VALLEY INTO  
THE NORTHERN MID-ATLANTIC AND PORTIONS OF THE NORTHEAST OVER THE  
NEXT 24 TO 36 HOURS WHERE FLOOD WATCHES AND WARNINGS ARE IN  
EFFECT. THESE LOCATIONS ARE NORTH OF A QUASI-STATIONARY FRONT THAT  
EXTENDED EAST-WEST ACROSS THE MID-ATLANTIC COAST AS OF SUNDAY  
AFTERNOON, SEPARATING COOL/WET CONDITIONS FROM MORE SUMMER-LIKE  
HEAT AND HUMIDITY ACROSS THE SOUTHEASTERN U.S. TO THE NORTH, COOL  
EAST-NORTHEASTERLY FLOW AT THE SURFACE WILL BE OVERRUN BY A MOIST  
SOUTHERLY FETCH OF WINDS IN THE LOWER LEVELS OF THE ATMOSPHERE,  
LOCATED OUT AHEAD OF A COLD FRONT STRETCHING FROM THE UPPER OHIO  
VALLEY TO THE WESTERN GULF COAST. AN ADDITIONAL 2-4 INCHES OF RAIN  
IS EXPECTED FROM THE OHIO/PENNSYLVANIA BORDER INTO NORTHERN  
PENNSYLVANIA AND CENTRAL NEW YORK THROUGH MONDAY, LEADING TO  
FLOODING FOR A FEW OF THESE LOCATIONS.  
 
SCATTERED THUNDERSTORMS WILL BE FOUND NEAR AND AHEAD OF THE COLD  
FRONT WHICH EXTENDS SOUTHWARD FROM THE OHIO VALLEY TO THE WESTERN  
GULF COAST REGION, DIURNALLY ENHANCED IN COVERAGE DURING THE  
AFTERNOON AND EVENING HOURS. THE SOUTHERN PORTION OF THE FRONT IS  
EXPECTED TO REMAIN IN ABOUT THE SAME LOCATION THROUGH TUESDAY,  
WHICH IS EXPECTED TO PROMOTE LOCALLY HEAVY RAINFALL TOTALS FROM  
SOUTHERN AND EASTERN TEXAS INTO THE CENTRAL GULF COAST. GIVEN DEEP  
MOISTURE IN PLACE NEAR THE FRONT, LOCALIZED FLASH FLOODING WILL BE  
POSSIBLE FOR LOCATIONS NEAR THE TEXAS AND LOUISIANA COASTS THROUGH  
WEDNESDAY MORNING.  
 
ACROSS THE NORTHWESTERN U.S., A LARGE CLOSED UPPER LEVEL LOW WILL  
REMAIN NEAR THE PACIFIC NORTHWEST COAST BRINGING COOLER THAN  
AVERAGE TEMPERATURES TO THE INTERIOR NORTHWEST. HIGH TEMPERATURES  
ARE FORECAST TO BE GENERALLY 5-15 DEGREES BELOW MID-SEPTEMBER  
AVERAGES THROUGH THE MIDDLE OF THE WEEK. IN ADDITION, STEADY LIGHT  
TO OCCASIONALLY MODERATE RAINFALL WILL BEGIN TO IMPACT WESTERN  
WASHINGTON INTO NORTHWEST OREGON LATER THIS EVENING WITH  
INCREASING CLOUD COVER FOR INTERIOR LOCATIONS.  
 
OTTO  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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