812  
FXUS01 KWBC 200759  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
259 AM EST TUE FEB 20 2018  
 
VALID 12Z TUE FEB 20 2018 - 12Z THU FEB 22 2018  
 
...HEAVY SNOW LIKELY OVER THE NORTHERN PLAINS AND UPPER  
MISSISSIPPI VALLEY...  
 
...HEAVY RAIN AND FLOODING POSSIBLE FOR PORTIONS OF THE SOUTHERN  
PLAINS TO THE WESTERN OHIO VALLEY AND INTO THE LOWER GREAT LAKES...  
 
...RAIN/FREEZING RAIN POSSIBLE FROM OF THE MIDDLE/UPPER  
MISSISSIPPI VALLEY INTO THE UPPER GREAT LAKES...  
 
...TEMPERATURES WILL BE 15 TO 35 DEGREES BELOW AVERAGE OVER THE  
NORTHERN ROCKIES INTO PARTS OF THE NORTHERN/CENTRAL PLAINS...  
 
OVER THE NEXT COUPLE OF DAYS A QUASI-STATIONARY FRONT OVER THE  
CENTRAL U.S. WILL BRING WIDESPREAD RAIN AND THUNDERSTORMS FROM THE  
SOUTHERN PLAINS TO THE GREAT LAKES/OHIO VALLEY AND EAST; WITH  
HEAVY SNOW ACROSS THE NORTHERN PLAINS AND UPPER MISSISSIPPI  
VALLEY. A NARROW TRANSITION ZONE WILL SETUP ACROSS THE MIDDLE AND  
UPPER MISSISSIPPI VALLEY TOWARD THE GREAT LAKES WHERE FREEZING  
RAIN WILL BE POSSIBLE. WINTER WEATHER ADVISORIES ARE IN EFFECT  
FROM NEBRASKA TO THE DAKOTAS AND EAST TO NORTHERN MICHIGAN.  
NORTHWEST NEBRASKA TO CENTRAL SOUTH DAKOTA HAVE WINTER STORM  
WARNINGS IN EFFECT.  
 
FLASH FLOOD WATCHES, FLOOD WARNINGS AND ADVISORIES ARE IN EFFECT  
FROM NORTHEAST TEXAS TO THE SOUTHERN MISSOURI AND FOR THE LOWER  
GREAT LAKES REGION. SEVERAL INCHES OF RAIN IS EXPECTED ALONG THE  
STALLED FRONT OVER A LENGTHY TIME FRAME- LIKELY CONTINUING INTO  
THE WEEKEND. RUN OFF FROM THE ABUNDANT RAIN WILL CAUSE LOCAL  
CREEKS AND STREAMS TO RISE WHICH MAY LEAD TO RIVERS TO SWELL OR  
OVERFLOW THEIR BANKS. URBAN FLOODING MAY ALSO OCCUR DUE TO THE  
EXCESSIVE RAINFALL.  
 
UPPER-LEVEL ENERGY JUST OFF THE PACIFIC NORTHWEST COAST WILL MOVE  
SOUTHWARD TO OFF THE CENTRAL/SOUTHERN CALIFORNIA COAST BY  
WEDNESDAY. ADDITIONAL UPPER-LEVEL ENERGY WILL MOVE OVER THE  
PACIFIC NORTHWEST ON TUESDAY EVENING INTO WEDNESDAY SPREADING.  
SNOW TO PARTS OF THE PACIFIC NORTHWEST COAST ON TUESDAY AFTERNOON  
THAT WILL CHANGE OVER TO RAIN ALONG THE NORTHWEST AND NORTHERN  
CALIFORNIA COAST BY TUESDAY EVENING. THE SNOW WILL CONTINUE JUST  
INLAND OVER PARTS OF THE NORTHWEST INTO NORTHERN CALIFORNIA  
THROUGH WEDNESDAY.  
 
CAMPBELL  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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