679  
FXUS01 KWBC 070821  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
320 AM EST TUE NOV 07 2017  
 
VALID 12Z TUE NOV 07 2017 - 12Z THU NOV 09 2017  
 
...HEAVY RAIN POSSIBLE OVER PARTS OF THE PACIFIC NORTHWEST AND  
NORTHERN CALIFORNIA...  
   
..HEAVY RAIN POSSIBLE OVER PARTS OF THE SOUTHERN PLAINS
 
 
   
..FREEZING RAIN POSSIBLE OVER PARTS OF THE COLUMBIA RIVER GORGE
 
 
A FRONT EXTENDING FROM THE CAROLINAS ROUGHLY WESTWARD TO THE  
SOUTHERN HIGH PLAINS WILL SLOWLY MOVE SOUTHEASTWARD OFF MOST OF  
THE SOUTHEAST COAST AND THE GULF COAST BY WEDNESDAY EVENING.  
SHOWERS AND THUNDERSTORMS WILL DEVELOP OVER PARTS OF THE  
OHIO/TENNESSEE VALLEYS INTO PARTS OF THE MIDDLE/LOWER MISSISSIPPI  
VALLEY THAT WILL MOVE EASTWARD OFF THE SOUTHEAST COAST BY  
WEDNESDAY MORNING. RAIN WILL DEVELOP OVER PARTS OF THE CENTRAL  
APPALACHIANS/NORTHERN MID-ATLANTIC ON TUESDAY, MOVING OFF THE  
NORTHERN MID-ATLANTIC COAST OVERNIGHT TUESDAY.  
 
UPPER-LEVEL ENERGY OVER THE GREAT BASIN/CENTRAL ROCKIES AND  
SOUTHERN CALIFORNIA WILL MOVE SOUTHEASTWARD TO THE SOUTHERN PLAINS  
BY WEDNESDAY INTO THURSDAY. THE UPPER-LEVEL ENERGY WILL PRODUCE  
SNOW AND LOWER ELEVATION RAIN OVER PARTS OF THE CENTRAL ROCKIES  
AND INTO PARTS OF THE SOUTHERN ROCKIES AND SOUTHERN/CENTRAL HIGH  
PLAINS ON TUESDAY, ENDING ON WEDNESDAY MORNING. ON TUESDAY  
EVENING, MOISTURE FROM THE GULF OF MEXICO WILL MOVE NORTHWESTWARD  
OVER THE SOUTHERN PLAINS THROUGH WEDNESDAY EVENING. RAIN AND  
THUNDERSTORMS WILL DEVELOP OVER PARTS OF THE SOUTHERN PLAINS  
OVERNIGHT TUESDAY THAT WILL EXPAND INTO THE LOWER MISSISSIPPI  
VALLEY BY WEDNESDAY MORNING AND INTO THE SOUTHEAST BY WEDNESDAY  
EVENING.  
 
MEANWHILE, LAKE EFFECT SNOW WILL DEVELOP OVER PARTS OF THE UPPER  
PENINSULA OF MICHIGAN ON TUESDAY INTO TUESDAY EVENING.  
ADDITIONALLY, A FRONT OVER SOUTH-CENTRAL CANADA WILL MOVE INTO THE  
UPPER MIDWEST OVERNIGHT TUESDAY INTO WEDNESDAY. LIGHT SNOW WILL  
DEVELOP OVER PARTS OF THE UPPER MIDWEST ON WEDNESDAY INTO  
WEDNESDAY EVENING. FURTHERMORE, A FRONT OVER THE EASTERN PACIFIC  
WILL APPROACH THE PACIFIC NORTHWEST COAST ON WEDNESDAY. AS THE  
MOISTURE AND ENERGY ASSOCIATED WITH THE SYSTEM BEGIN TO MOVE  
INLAND, THE SNOW LEVELS WILL BE VERY HIGH OVER THE NORTHWEST SO  
SNOW WILL DEVELOP ONLY OVER THE HIGHEST ELEVATIONS OF THE CASCADES  
AND NORTHERN CALIFORNIA ON WEDNESDAY. RAIN AND THE HIGHEST  
ELEVATION SNOW WILL MOVE INLAND ON WEDNESDAY MORNING EXPANDING  
INLAND OVER THE PACIFIC NORTHWEST AND NORTHERN CALIFORNIA ON  
WEDNESDAY INTO WEDNESDAY EVENING. THERE IS A CHANCE OF FREEZING  
RAIN DEVELOPING OVER PARTS OF THE COLUMBIA RIVER GORGE ON  
WEDNESDAY.  
 
ZIEGENFELDER  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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