242  
FXUS01 KWBC 172007  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
306 PM EST SAT FEB 17 2018  
 
VALID 00Z SUN FEB 18 2018 - 00Z TUE FEB 20 2018  
 
...HEAVY SNOW POSSIBLE OVER THE CASCADES/NORTHERN ROCKIES AND  
PARTS OF THE UPPER GREAT LAKES...  
   
..HEAVY TO MODERATE SNOW POSSIBLE OVER PARTS OF THE NORTHEAST
 
 
...RAIN/FREEZING RAIN POSSIBLE OVER PARTS OF THE MIDDLE/UPPER  
MISSISSIPPI VALLEY...  
 
DEVELOPING LOW PRESSURE OVER THE SOUTHEAST WILL MOVE NORTHEASTWARD  
OUT OVER THE WESTERN ATLANTIC BY SUNDAY MORNING. THE STORM WILL  
PRODUCE RAIN FROM PARTS OF THE SOUTHERN OHIO VALLEY/SOUTHERN  
MID-ATLANTIC SOUTHWESTWARD TO THE LOWER MISSISSIPPI VALLEY/WESTERN  
GULF COAST THAT WILL MOVE OFF THE SOUTHERN MID-ATLANTIC COAST BY  
SUNDAY MORNING WHILE DISSIPATING FROM THE SOUTHERN APPALACHIANS TO  
THE TENNESSEE VALLEY LATE SATURDAY NIGHT. SNOW WILL DEVELOP OVER  
PARTS OF THE NORTHERN OHIO VALLEY/GREAT LAKES INTO THE NORTHERN  
MID-ATLANTIC THAT WILL EXPAND INTO THE NORTHEAST OVERNIGHT  
SATURDAY WHILE ENDING OVER THE OHIO VALLEY/UPPER GREAT LAKES. THE  
SNOW WILL MOVE OFF THE NORTHEAST COAST BY LATE SUNDAY AFTERNOON  
INTO EVENING. ADDITIONALLY, OVERNIGHT SATURDAY, MOISTURE FROM THE  
WESTERN GULF OF MEXICO WILL FLOW NORTHWARD OVER THE SOUTHERN  
PLAINS AIDING IN THE DEVELOPMENT OF SCATTERED SHOWERS AND  
THUNDERSTORMS OVER PARTS OF THE SOUTHERN PLAINS ON SUNDAY MORNING  
INTO SUNDAY EVENING.  
 
MEANWHILE, A SECOND STORM OVER THE NORTHWEST/NORTHERN ROCKIES WILL  
MOVE SOUTHEASTWARD INTO THE GREAT BASIN/CENTRAL ROCKIES INTO THE  
MIDDLE MISSISSIPPI VALLEY BY MONDAY. THE SYSTEM WILL PRODUCE RAIN  
AND HIGHER ELEVATION SNOW OVER PARTS OF THE PACIFIC NORTHWEST WITH  
SNOW OVER THE NORTHERN ROCKIES ON SATURDAY EVENING. OVERNIGHT  
SATURDAY THE ASSOCIATED FRONT WILL SINK SOUTHWARD TO CENTRAL  
CALIFORNIA CONTINUING TO THE SOUTHWEST BY MONDAY. THE SNOW LEVELS  
WILL LOWER OVER THE NORTHWEST INTO THE NORTHERN INTERMOUNTAIN  
REGION/NORTHERN ROCKIES SATURDAY INTO SUNDAY/MONDAY. SNOW WILL  
DEVELOP OVER PARTS OF THE PACIFIC NORTHWEST COAST BY SUNDAY  
MORNING. COASTAL RAIN AND SNOW WILL MOVE INTO PARTS OF NORTHERN  
CALIFORNIA ON SUNDAY AND INTO PARTS OF CENTRAL CALIFORNIA  
OVERNIGHT SUNDAY INTO MONDAY. IN ADDITION OVERNIGHT SATURDAY,  
SNOW WILL EXPAND INTO PARTS OF THE NORTHERN PLAINS THAT WILL  
CONTINUE TO EXPAND INTO THE UPPER GREAT LAKES SUNDAY AFTERNOON  
INTO SUNDAY EVENING WHILE MOVING INTO PARTS OF THE MIDDLE  
MISSISSIPPI VALLEY OVERNIGHT SUNDAY. THE AFOREMENTIONED MOISTURE  
MOVING NORTHWARD OVER THE SOUTHERN PLAINS WILL PUSH INTO THE  
CENTRAL PLAINS/MIDDLE MISSISSIPPI VALLEY BY SUNDAY EVENING  
CONTINUING TO MOVE NORTHEASTWARD INTO THE WESTERN OHIO  
VALLEY/UPPER GREAT LAKES OVERNIGHT SUNDAY INTO MONDAY. SHOWERS  
AND THUNDERSTORMS WILL MOVE NORTHEASTWARD WITH THE MOISTURE OVER  
PARTS OF THE CENTRAL PLAINS/MIDDLE MISSISSIPPI VALLEY BY MONDAY.  
RAIN WILL ALSO DEVELOP OVER PARTS OF THE TENNESSEE  
VALLEY/SOUTHEAST OVERNIGHT SUNDAY EXPANDING INTO PART OF THE  
MID-ATLANTIC BY MONDAY. ON MONDAY INTO MONDAY EVENING, AN AREA OF  
RAIN/FREEZING RAIN WILL DEVELOP OVER PARTS OF THE MIDDLE  
MISSISSIPPI VALLEY MOVING INTO PARTS OF THE UPPER MISSISSIPPI  
VALLEY BY MONDAY EVENING.  
 
ZIEGENFELDER  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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