440  
FXUS01 KWBC 192012  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
312 PM EST TUE FEB 19 2019  
 
VALID 00Z WED FEB 20 2019 - 00Z FRI FEB 22 2019  
 
...SIGNIFICANT WINTER STORM FOR THE MID-ATLANTIC REGION ON  
WEDNESDAY...  
 
...HEAVY RAIN WILL CONTINUE A THREAT FOR FLOODING FROM THE LOWER  
MISSISSIPPI VALLEY INTO THE OHIO VALLEY...  
 
...HEAVY SNOW FOR PORTIONS OF THE UPPER MIDWEST  
TONIGHT/WEDNESDAY...  
   
..CONTINUED COLD AND SNOWY WEST OF THE CONTINENTAL DIVIDE
 
 
A LARGE WINTER STORM WILL AFFECT LOCATIONS FROM THE UPPER MIDWEST  
TO THE EAST COAST BEGINNING TONIGHT. A DOME OF HIGH PRESSURE  
CURRENTLY IN PLACE ACROSS THE GREAT LAKES REGION HAS SET THE STAGE  
FOR WINTRY PRECIPITATION WITH TEMPERATURES NEAR OR BELOW FREEZING  
FROM THE MID-MISSISSIPPI VALLEY TO THE NORTHERN MID-ATLANTIC  
REGION. AS AN UPPER LEVEL SYSTEM LIFTS THROUGH THE GREAT PLAINS  
TONIGHT, SIGNIFICANT AMOUNTS OF MOISTURE WILL SPREAD NORTH AND  
EAST FROM THE GULF OF MEXICO. THIS MOISTURE WILL MEET WITH COLD  
AIR ACROSS THE UPPER MIDWEST WHERE AN AREA OF LOW PRESSURE IS  
FORECAST TO DEVELOP AND TRACK ACROSS THE UPPER MISSISSIPPI VALLEY  
ON WEDNESDAY. WIDESPREAD SNOWFALL TOTALS OF 4-8 INCHES (LOCALLY  
HIGHER) ARE EXPECTED FROM EASTERN NEBRASKA INTO EASTERN MINNESOTA  
AND NORTHWESTERN WISCONSIN THROUGH THE DAY ON WEDNESDAY.  
TEMPERATURES WILL REMAIN BELOW FREEZING THROUGH THURSDAY FROM THE  
DAKOTAS INTO THE UPPER MISSISSIPPI VALLEY, WHICH TRANSLATES INTO  
DAYTIME HIGHS GENERALLY 5 TO 15 DEGREES BELOW AVERAGE.  
 
MEANWHILE, SNOW WILL MOVE FROM SOUTHWEST TO NORTHEAST INTO OHIO  
AND THE MID-ATLANTIC REGION LATE TONIGHT, CHANGING TO A WINTRY MIX  
OF SLEET AND FREEZING RAIN AND EVENTUALLY ALL RAIN FOR MANY. THE  
TIME OF CHANGEOVER WILL OCCUR FROM SOUTHWEST TO NORTHEAST AND  
DEPEND ON EXACT LOCATION BUT WILL BE DELAYED FOR LOCATIONS NEAR  
THE CENTRAL APPALACHIANS WHERE SIGNIFICANT ICE ACCUMULATIONS NEAR  
0.25 INCHES ALONG WITH 4-8 INCHES OF SNOW (LOCALLY HIGHER) WILL BE  
POSSIBLE. MAJOR CITIES ALONG I-95 FROM BOSTON TO RICHMOND WILL  
LIKELY SEE SOME FROM OF FROZEN PRECIPITATION AT THE ONSET BEFORE  
CHANGING OVER TO RAIN BEFORE ENDING FARTHER TO THE SOUTH, HEAVY  
RAIN IS EXPECTED TO CONTINUE FROM THE LOWER MISSISSIPPI VALLEY  
INTO PORTIONS OF THE OHIO VALLEY WHERE AN ADDITIONAL 1-3 INCHES OF  
RAIN, ON TOP OF ALREADY SATURATED GROUND, CAN BE EXPECTED THROUGH  
WEDNESDAY AFTERNOON. FLOOD AND FLASH FLOOD WATCHES ARE ALREADY IN  
EFFECT FOR MANY OF THESE LOCATIONS. ADDITIONAL HEAVY RAIN IS  
EXPECTED TO BEGIN FOR SOME OF THESE SAME LOCATIONS IMPACTED BY  
FLOODING THURSDAY NIGHT.  
 
OUT WEST, HIGH TEMPERATURES WILL CONTINUE TO RUN 10-20 DEGREES  
BELOW AVERAGE ALONG AND WEST OF THE CONTINENTAL DIVIDE THROUGH  
THURSDAY. ANOTHER STORM SYSTEM IS FORECAST TO DROP SOUTH FROM THE  
PACIFIC NORTHWEST TONIGHT, REACHING THE SOUTHWEST BY THURSDAY  
MORNING. ADDITIONAL SNOWFALL TOTALS OF OVER A FOOT ARE FORECAST  
FOR SOME OF THE MAJOR MOUNTAIN RANGES EXTENDING FROM WASHINGTON  
AND OREGON INTO ARIZONA AND SOUTHWESTERN COLORADO THROUGH THURSDAY  
NIGHT.  
 
OTTO  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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