321  
FXUS01 KWBC 240825  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
424 AM EDT MON APR 24 2017  
 
VALID 12Z MON APR 24 2017 - 12Z WED APR 26 2017  
   
..HEAVY RAIN POSSIBLE OVER THE CAROLINAS
 
 
...HEAVY RAIN POSSIBLE OVER PARTS OF THE PACIFIC  
NORTHWEST/NORTHERN CALIFORNIA...  
 
...SNOW POSSIBLE FOR PARTS OF THE NORTHERN/CENTRAL ROCKIES AND THE  
CASCADES...  
 
LOW PRESSURE OVER THE SOUTHEAST WILL SLOWLY MOVE NORTHWARD TO THE  
NORTH CAROLINA COAST BY TUESDAY EVENING. THE SYSTEM WILL PRODUCE  
SHOWERS AND THUNDERSTORMS OVER PARTS OF THE SOUTHEAST AND PORTIONS  
OF THE SOUTHERN MID-ATLANTIC THAT WILL MOVE OFF THE SOUTHEAST  
COAST BY TUESDAY MORNING AND REMAIN OVER PARTS OF THE SOUTHERN  
MID-ATLANTIC COAST THROUGH TUESDAY EVENING. RAIN WILL ALSO  
DEVELOP OVER THE VIRGINIAS THAT WILL SLOWLY EXPAND NORTHWARD INTO  
THE NORTHERN MID-ATLANTIC/LOWER GREAT LAKES AND SOUTHERN NEW  
ENGLAND BY TUESDAY MORNING AND CONTINUE TO EXPAND NORTHWARD INTO  
NORTHERN NEW ENGLAND BY TUESDAY EVENING.  
 
MEANWHILE, A FRONT EXTENDING FROM THE NORTHERN PLAINS TO THE  
CENTRAL HIGH PLAINS INTO THE GREAT BASIN WILL MOVE EASTWARD TO THE  
UPPER GREAT LAKES/MIDDLE MISSISSIPPI VALLEY TO THE SOUTHERN HIGH  
PLAINS INTO THE SOUTHWEST BY TUESDAY EVENING. THE STORM WILL  
PRODUCE RAIN AND SNOW OVER PARTS OF THE NORTHERN PLAINS INTO THE  
UPPER GREAT LAKES THAT WILL MOVE INTO PARTS OF UPPER/MIDDLE  
MISSISSIPPI VALLEY AND NORTHERN PLAINS BY MONDAY EVENING. AS THE  
SYSTEM MOVES EASTWARD, MOISTURE WILL MOVE NORTHWARD FROM THE  
WESTERN GULF OF MEXICO AND POOL ALONG THE BOUNDARY. OVERNIGHT  
MONDAY, THE RAIN AND SNOW WILL CHANGE OVER TO ALL RAIN OVER PARTS  
OF THE UPPER MISSISSIPPI VALLEY/UPPER GREAT LAKES THROUGH TUESDAY.  
IN ADDITION, SHOWERS AND THUNDERSTORM WILL START TO DEVELOP NEAR  
THE FRONT OVER THE MIDDLE MISSOURI VALLEY OVERNIGHT MONDAY  
EXPANDING INTO THE CENTRAL PLAINS BY TUESDAY MORNING AND CONTINUE  
TO EXPAND INTO THE CENTRAL HIGH PLAINS AND PARTS OF THE SOUTHERN  
ROCKIES BY TUESDAY EVENING.  
 
IN THE MEANTIME, UPPER-LEVEL ENERGY WILL MOVE ONSHORE OVER THE  
PACIFIC NORTHWEST AND MOVE SOUTHEASTWARD TO THE CENTRAL/SOUTHERN  
HIGH PLAINS AND THE CENTRAL/SOUTHERN PLAINS BY TUESDAY EVENING.  
SOME MOISTURE WILL ACCOMPANY THE ENERGY ONSHORE OVER PARTS OF THE  
NORTHWEST INTO NORTHERN/CENTRAL CALIFORNIA ON MONDAY INTO MONDAY  
EVENING. RAIN AND HIGHEST ELEVATION SNOW WILL DEVELOP OVER PARTS  
PACIFIC NORTHWEST INTO NORTHERN CALIFORNIA THROUGH TUESDAY  
MORNING. SNOW AND LOWER ELEVATION RAIN WILL DEVELOP OVER PARTS OF  
THE NORTHERN ROCKIES ON MONDAY MORNING THAT WILL EXPAND INTO PARTS  
OF THE CENTRAL ROCKIES/GREAT BASIN BY MONDAY EVENING AND CONTINUE  
OVER THE AREA THROUGH TUESDAY EVENING. ADDITIONAL UPPER-LEVEL  
ENERGY WILL MOVE ONSHORE OVER THE PACIFIC NORTHWEST ON TUESDAY  
INTO TUESDAY EVENING. THE ENERGY WILL AID IN PRODUCING RAIN OVER  
PARTS OF THE PACIFIC NORTHWEST COAST BY TUESDAY AFTERNOON AND  
EXPAND INLAND BY TUESDAY EVENING.  
 
ZIEGENFELDER  
 
GRAPHICS AVAILABLE AT WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_WBG.PHP  
 

 
 
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