965  
FXUS01 KWBC 221956  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
355 PM EDT SUN OCT 22 2017  
 
VALID 00Z MON OCT 23 2017 - 00Z WED OCT 25 2017  
 
...WIDESPREAD RAIN AND THUNDERSTORMS FOR THE EASTERN HALF OF THE  
NATION THROUGH THE START OF THE WORKWEEK...  
 
A COLD FRONT CURRENTLY MOVING THROUGH THE UPPER GREAT LAKES TO THE  
LOWER MISSISSIPPI VALLEY WILL CONTINUE TO TRACK EASTWARD OVER THE  
NEXT COUPLE OF DAYS. PLENTY OF MOISTURE, A STRONG UPPER-LEVEL  
TROUGH, AND THE FRONT WILL HELP LEAD TO WIDESPREAD RAIN WITH SOME  
THUNDERSTORMS ALONG AND AHEAD OF THE FRONT. SUNDAY NIGHT,  
THUNDERSTORMS CONTAINING HEAVY RAINFALL THAT COULD CAUSE FLASH  
FLOODING ARE POSSIBLE ALONG THE CENTRAL GULF COAST AND PORTIONS OF  
THE SOUTHEAST. ON MONDAY, THE FRONT WILL LINGER THROUGH THE UPPER  
GREAT LAKES REGION BUT PROGRESS EASTWARD THROUGH THE OHIO VALLEY  
AND SOUTHEAST. A SLIGHT RISK OF FLASH FLOODING IS IN EFFECT FOR  
MONDAY AND MONDAY NIGHT FOR PARTS OF THE TENNESSEE VALLEY AND THE  
SOUTHERN AND CENTRAL APPALACHIANS. BY TUESDAY, THE FRONT WILL PUSH  
INTO THE MID-ATLANTIC, CAUSING INCREASING RAIN AND THUNDERSTORM  
CHANCES THERE AND IN THE NORTHEAST. AHEAD OF THIS FRONT, THE  
MID-ATLANTIC AND NORTHEAST WILL HAVE TEMPERATURES 10-15 DEGREES  
ABOVE AVERAGE.  
 
RAINFALL THAT COULD BE HEAVY IN SOME AREAS WILL LINGER IN THE  
PACIFIC NORTHWEST ON SUNDAY NIGHT AS MOIST AIR FROM AN ATMOSPHERIC  
RIVER CONTINUES TO FUNNEL INTO THE AREA. THE ATMOSPHERIC RIVER IS  
EXPECTED TO WEAKEN AND LIFT NORTHWARD OUT OF THE AREA BY MONDAY AS  
AN UPPER-LEVEL RIDGE BUILDS IN, SO THE NORTHWEST IS FORECAST TO  
HAVE QUIETER WEATHER ON MONDAY AND TUESDAY.  
 
A QUICKLY MOVING LOW PRESSURE SYSTEM WILL MAKE ITS WAY THROUGH THE  
NORTHERN TIER OF THE COUNTRY OVER THE NEXT COUPLE OF DAYS, BEFORE  
COMBINING WITH THE STRONGER FRONTAL SYSTEM MOVING THROUGH THE EAST  
ON TUESDAY. THE TAIL END OF A COLD FRONT ASSOCIATED WITH THIS LOW  
PRESSURE SYSTEM WILL HELP CAUSE LINGERING RAIN AND SNOW SHOWERS  
FOR THE NORTHERN ROCKIES ON SUNDAY NIGHT. THE LOW IS EXPECTED TO  
PRODUCE RAIN SHOWERS FOR THE NORTHERN PLAINS TO UPPER MISSISSIPPI  
VALLEY ON SUNDAY NIGHT AND MONDAY. HIGH WIND IS POSSIBLE BEHIND  
THIS SYSTEM FOR THE NORTHERN HIGH PLAINS.  
 
VERY HOT TEMPERATURES IN THE 90S AND 100S FOR HIGHS WILL COMBINE  
WITH DRY CONDITIONS AND GUSTY WINDS TO PRODUCE FIRE WEATHER  
CONCERNS FOR THE CENTRAL AND SOUTHERN PORTIONS OF THE CALIFORNIA  
COAST. THE REST OF THE WEST WILL BE WARMER THAN AVERAGE AS WELL,  
WITH TEMPERATURES 10-15 DEGREES ABOVE AVERAGE IN MOST AREAS BY  
TUESDAY.  
 
TATE  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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