598  
FXUS01 KWBC 181935  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
235 PM EST MON FEB 18 2019  
 
VALID 00Z TUE FEB 19 2019 - 00Z THU FEB 21 2019  
 
...HEAVY RAIN POSSIBLE FROM THE CENTRAL APPALACHIANS INTO THE  
OHIO, TENNESSEE, AND LOWER MISSISSIPPI VALLEYS...  
 
...HEAVY SNOW POSSIBLE OVER PARTS OF THE CASCADES,  
CENTRAL/SOUTHERN ROCKIES, CENTRAL PLAINS INTO UPPER GREAT LAKES,  
AND OVER PARTS OF THE MID-ATLANTIC/CENTRAL APPALACHIANS...  
 
...RAIN/FREEZING RAIN POSSIBLE OVER PARTS OF THE CENTRAL/SOUTHERN  
APPALACHIANS...  
 
...TEMPERATURES WILL BE 15 TO 26 DEGREES BELOW AVERAGE OVER THE  
PLAINS/ROCKIES AND GREAT BASIN...  
 
A STORM OVER THE CENTRAL/SOUTHERN ROCKIES WILL MOVE SOUTHEASTWARD  
TO THE WESTERN GULF COAST BY TUESDAY AND MOVE NORTHWARD TO THE  
MIDDLE MISSISSIPPI VALLEY BY WEDNESDAY. THE SYSTEM WILL PRODUCE  
SNOW OVER PARTS OF THE NORTHERN INTERMOUNTAIN REGION, GREAT BASIN,  
AND THE NORTHERN PARTS OF THE SOUTHWEST ALONG WITH THE  
CENTRAL/SOUTHERN ROCKIES ON MONDAY EVENING. THE SNOW WILL MOVE  
EASTWARD INTO PARTS OF THE SOUTHERN/CENTRAL PLAINS AND MIDDLE  
MISSISSIPPI VALLEY BY TUESDAY EVENING. THE SNOW WILL CONTINUE TO  
MOVE INTO PARTS OF THE NORTHERN PLAINS/UPPER MISSISSIPPI VALLEY BY  
WEDNESDAY MORNING. THE SNOW WILL ALSO MOVE INTO PARTS OF THE OHIO  
VALLEY, CENTRAL APPALACHIANS, AND NORTHERN MID-ATLANTIC BY  
WEDNESDAY MORNING, TOO. BY WEDNESDAY EVENING SNOW WILL MOVE INTO  
THE UPPER GREAT LAKES.  
 
ADDITIONALLY AS THE SYSTEM MOVES OUT OF THE ROCKIES, MOISTURE FROM  
THE WESTERN GULF OF MEXICO WILL MOVE NORTHWARD OVER OVER PARTS OF  
THE SOUTHERN PLAINS EASTWARD TO THE SOUTHEAST. THE MOISTURE WILL  
ADVANCES AS FAR NORTH AS THE MIDDLE MISSISSIPPI VALLEY/OHIO VALLEY  
OVERNIGHT TUESDAY AND INTO OHIO VALLEY/MID-ATLANTIC BY WEDNESDAY  
EVENING. THE STORM WILL ALSO PRODUCE RAIN OVER THE LOWER  
ELEVATIONS OF THE SOUTHWEST ON MONDAY EVENING THAT WILL CHANGE  
OVER TO SNOW BY TUESDAY MORNING. IN ADDITION AS THE MOISTURE FROM  
THE GULF OF MEXICO MOVES INLAND OVER THE WESTERN/CENTRAL GULF  
COAST, SHOWERS AND THUNDERSTORMS WILL DEVELOP ALONG AND IN JUST  
INLAND OVER PARTS OF THE WESTERN/CENTRAL GULF COAST ON TUESDAY.  
RAIN WILL DEVELOP FARTHER INLAND OVER PARTS OF THE SOUTHERN  
PLAINS, LOWER MISSISSIPPI AND TENNESSEE VALLEYS AS WELL AS PARTS  
OF THE SOUTHEAST ALSO ON TUESDAY. THE RAIN WILL BECOME HEAVY AT  
TIMES. THE HEAVY RAIN AND THUNDERSTORMS WILL MOVE NORTHWARD  
OVERNIGHT TUESDAY INTO THE OHIO VALLEY CONTINUING INTO WEDNESDAY.  
ON WEDNESDAY MORNING, RAIN/FREEZING RAIN WILL DEVELOP OVER PARTS  
OF THE SOUTHERN APPALACHIANS THAT WILL MOVE NORTHWARD INTO THE  
CENTRAL APPALACHIANS BY WEDNESDAY EVENING. THERE IS A SLIGHT TO  
MODERATE RISK OF EXCESSIVE RAINFALL FROM THE LOWER  
MISSISSIPPI/TENNESSEE VALLEYS INTO PARTS OF THE OHIO VALLEY FROM  
TUESDAY INTO WEDNESDAY.  
 
MEANWHILE, UPPER-LEVEL ENERGY OVER PARTS OF THE NORTH PACIFIC INTO  
WESTERN CANADA WILL MOVE SOUTHWARD ALONG THE WEST COAST TO  
NORTHWESTERN MEXICO BY WEDNESDAY THAT WILL BE FOLLOWED BY A MUCH  
STRONGER AREA OF UPPER-LEVEL ENERGY ON WEDNESDAY. THE ENERGY AND  
DEVELOPING ONSHORE FLOW WILL AID IN PRODUCING RAIN AND HIGHER  
ELEVATION SNOW OVER PARTS OF THE PACIFIC NORTHWEST ON TUESDAY  
EVENING. OVERNIGHT TUESDAY, THE SNOW WILL EXPAND INLAND INTO  
PARTS OF THE NORTHERN ROCKIES AND GREAT BASIN. AS THE ENERGY  
MOVES FARTHER SOUTH OVER THE WEST COAST, RAIN AND HIGHER ELEVATION  
SNOW WILL DEVELOP OVER PARTS OF CALIFORNIA AND MOVES FARTHER  
INLAND OVER THE GREAT BASIN BY WEDNESDAY EVENING.  
 
 
 
ZIEGENFELDER  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  
 

 
 
CLICK HERE TO GO TO PREVIOUS BULLETINS.

The Nexlab HPC Page Main Text Page