449  
FXUS01 KWBC 181958  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
258 PM EST SUN FEB 18 2018  
 
VALID 00Z MON FEB 19 2018 - 00Z WED FEB 21 2018  
 
...HEAVY SNOW POSSIBLE OVER THE NORTHERN PLAINS INTO THE CENTRAL  
ROCKIES AND THE UPPER GREAT LAKES...  
 
...HEAVY RAIN POSSIBLE FROM PARTS OF THE SOUTHERN PLAINS  
NORTHEASTWARD TO THE GREAT LAKES...  
 
...RAIN/FREEZING RAIN POSSIBLE OVER PARTS OF THE MIDDLE/UPPER  
MISSISSIPPI VALLEY INTO PARTS OF THE UPPER GREAT LAKES...  
 
...TEMPERATURES WILL BE 15 TO 40 DEGREES BELOW AVERAGE OVER PARTS  
OF THE NORTHERN/CENTRAL PLAINS INTO PARTS OF THE NORTHERN  
ROCKIES...  
 
A FRONT EXTENDING FROM THE UPPER GREAT LAKES TO THE SOUTHERN HIGH  
PLAINS WILL BECOME QUASI-STATIONARY THROUGH TUESDAY. THE SYSTEM  
WILL PRODUCE SNOW OVER PARTS OF THE UPPER GREAT LAKES/UPPER  
MISSISSIPPI VALLEY INTO PARTS OF THE NORTHERN PLAINS THROUGH  
TUESDAY. THE SNOW WILL EXPAND INTO PARTS OF THE CENTRAL PLAINS ON  
MONDAY INTO TUESDAY. MOISTURE FROM THE WESTERN GULF OF MEXICO  
WILL STREAM MOISTURE INTO PARTS OF THE CENTRAL/SOUTHERN PLAINS  
INTO PARTS OF THE LOWER/MIDDLE MISSISSIPPI VALLEY THAT WILL FLOW  
NORTHWARD INTO THE WESTERN OHIO VALLEY/GREAT LAKES ON MONDAY INTO  
TUESDAY. THE MOISTURE WILL AID IN PRODUCING SHOWERS AND  
THUNDERSTORMS OVER PARTS OF THE SOUTHERN PLAINS INTO PARTS OF THE  
LOWER MISSISSIPPI VALLEY THAT WILL EXPAND INTO PARTS OF THE MIDDLE  
MISSISSIPPI VALLEY/WESTERN OHIO VALLEY BY MONDAY MORNING  
CONTINUING THROUGH TUESDAY. THE MOISTURE WILL ALSO PRODUCE RAIN  
OVER PARTS OF THE SOUTHEAST THAT WILL LIFT NORTHWARD INTO THE OHIO  
VALLEY/MID-ATLANTIC BY MONDAY MORNING. THE RAIN WILL CONTINUE TO  
MOVE NORTHWARD INTO PARTS OF THE NORTHEAST BY MONDAY EVENING INTO  
TUESDAY. ADDITIONALLY ALONG THE RAIN/SNOW LINE, RAIN AND FREEZING  
RAIN WILL DEVELOP OVER PARTS OF THE CENTRAL PLAINS INTO PARTS OF  
THE UPPER GREAT LAKES MONDAY MORNING INTO TUESDAY.  
 
MEANWHILE ALONG THE WESTERN PARTS OF THE STORM, THE WESTERN END OF  
THE FRONT WILL EXTEND FROM THE CENTRAL ROCKIES INTO THE GREAT  
BASIN AND SOUTHERN CALIFORNIA. THE BOUNDARY WILL MOVE EASTWARD TO  
THE SOUTHERN HIGH PLAINS BY TUESDAY. THE SYSTEM WILL PRODUCE SNOW  
FROM PARTS OF THE PACIFIC NORTHWEST/NORTHERN CALIFORNIA EASTWARD  
TO THE NORTHERN/CENTRAL HIGH PLAINS AND COASTAL RAIN OVER PARTS OF  
THE NORTHERN/CENTRAL CALIFORNIA COAST WILL MOVE SOUTHEASTWARD INTO  
THE GREAT BASIN/CENTRAL ROCKIES OVERNIGHT SUNDAY INTO MONDAY. THE  
SNOW WILL CONTINUE TO MOVE SOUTHEASTWARD INTO PARTS OF THE  
SOUTHWEST/SOUTHERN ROCKIES AND THE HIGHER ELEVATIONS OF  
CENTRAL/SOUTHERN CALIFORNIA BY MONDAY EVENING. THE SNOW WILL WANE  
OVER PARTS OF THE PACIFIC NORTHWEST/NORTHERN ROCKIES AND PARTS OF  
CALIFORNIA/GREAT BASIN/SOUTHWEST BY TUESDAY. IN ADDITION,  
OVERNIGHT SUNDAY RAIN WILL DEVELOP OVER PARTS OF THE SOUTHWEST AND  
SOUTHERN CALIFORNIA COAST WITH RAIN ENDING OVER PARTS OF SOUTHERN  
CALIFORNIA COAST BY MONDAY EVENING.  
 
ZIEGENFELDER  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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