401  
FXUS01 KWBC 241956  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
356 PM EDT WED OCT 24 2018  
 
VALID 00Z THU OCT 25 2018 - 00Z SAT OCT 27 2018  
 
...STRENGTHENING LOW PRESSURE SYSTEM WILL CAUSE RAIN FROM TEXAS TO  
THE LOWER MISSISSIPPI VALLEY AND SOUTHEAST...  
   
..ACTIVE WEATHER TO CONTINUE FOR THE NORTHWESTERN U.S.
 
 
AN UPPER-LEVEL TROUGH IS EXPECTED TO INTENSIFY AND MOVE FROM THE  
FOUR CORNERS REGION INTO THE PLAINS AND MISSISSIPPI VALLEY OVER  
THE NEXT COUPLE OF DAYS. AT THE SURFACE, A LOW PRESSURE SYSTEM  
WILL MOVE EASTWARD ALONG THE GULF COAST. THIS PREEXISTING LOW  
COULD BE STRENGTHENED BY THE MID-LEVEL ENERGY FROM WHAT WAS  
FORMERLY WILLA, AND REMNANT MOISTURE FROM WILLA AS WELL AS  
MOISTURE FROM THE GULF OF MEXICO WILL CREATE WIDESPREAD RAIN. RAIN  
AND SOME THUNDERSTORMS WILL FOCUS IN TEXAS AND THE LOWER  
MISSISSIPPI VALLEY TONIGHT, SHIFTING INTO THE SOUTHEAST AND  
TENNESSEE VALLEY BY THURSDAY EVENING. EASTERN PARTS OF THE OHIO  
VALLEY REGION, THE CAROLINAS, AND THE MID-ATLANTIC ARE THEN  
FORECAST TO GET RAIN ON FRIDAY DUE TO THIS LOW. IN TERMS OF FLASH  
FLOODING, THERE ARE MARGINAL RISKS IN PLACE ALONG THE GULF COAST,  
WHERE THUNDERSTORMS COULD CREATE HIGHER RAIN RATES. GENERALLY, 1  
TO 2 INCHES OF RAIN IS EXPECTED FROM THIS LOW PRESSURE SYSTEM.  
 
IN THE NORTHWEST, A STRONG JET STREAM AS WELL AS MULTIPLE SURFACE  
FRONTS WILL CREATE CONTINUED CHANCES OF RAIN. THE HEAVIEST  
PRECIPITATION WILL OCCUR IN THE COASTAL RANGES AND THE CASCADES,  
AND MOST IS EXPECTED TO FALL AS RAIN, THOUGH THE HIGHER PEAKS  
COULD SEE SOME SNOW. LOWER ELEVATIONS WILL RECEIVE RAIN AS WELL,  
FROM THE PACIFIC NORTHWEST INTO THE NORTHERN GREAT BASIN AND  
NORTHERN ROCKIES.  
 
ELSEWHERE, SNOW IN THE NORTHEAST WILL WIND DOWN TONIGHT, WITH ONLY  
LIGHT SNOW SHOWERS AFTER THIS EVENING. ALONG A FRONTAL SYSTEM,  
LIGHT RAIN IS FORECAST FOR THE CENTRAL AND NORTHERN PLAINS ON  
WEDNESDAY NIGHT INTO THURSDAY, SHIFTING NORTHEAST INTO THE UPPER  
GREAT LAKES REGION BY FRIDAY MORNING.  
 
THE ONGOING TEMPERATURE PATTERN OF WARMER THAN AVERAGE IN THE  
WESTERN U.S. AND COLDER THAN AVERAGE IN THE EASTERN U.S. (WITH THE  
EXCEPTION OF FLORIDA) WILL CONTINUE THROUGH THE END OF THE WEEK.  
ON THE WESTERN SIDE OF THE STRENGTHENING LOW PRESSURE SYSTEM,  
PARTS OF THE CAROLINAS AND WESTERN VIRGINIA WILL ONLY SEE  
TEMPERATURES REACH THE 40S ON FRIDAY, WHICH COULD SET RECORDS FOR  
COLD HIGH TEMPERATURES.  
 
TATE  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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