471  
FXUS01 KWBC 232003  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
402 PM EDT TUE OCT 23 2018  
 
VALID 00Z WED OCT 24 2018 - 00Z FRI OCT 26 2018  
 
...LOCALLY HEAVY RAIN AND STORMS ARE EXPECTED FOR THE SOUTHWEST,  
TEXAS, AND INTO THE LOWER MISSISSIPPI VALLEY AND SOUTHEAST...  
   
..SNOW IS FORECAST FOR NORTHERN NEW ENGLAND
 
 
...THE NORTHWEST U.S. IS EXPECTING A COUPLE ROUNDS OF WET  
WEATHER...  
 
AN UPPER-LEVEL TROUGH OVER THE FOUR CORNERS REGION PLUS SUFFICIENT  
MOISTURE WILL LEAD TO RAIN SHOWERS AND SCATTERED THUNDERSTORMS IN  
THE SOUTHWEST, SOUTHERN ROCKIES, AND INTO TEXAS THROUGH TUESDAY.  
THE TROUGH MOVING EASTWARD WILL BRING RAIN TO MUCH OF TEXAS ON  
TUESDAY NIGHT AND WEDNESDAY. ADDITIONALLY, A SURFACE LOW AND A  
STATIONARY FRONT IS PRESENT ALONG THE GULF COAST. BY WEDNESDAY  
NIGHT INTO THURSDAY, THE REMNANT ENERGY FROM WHAT IS CURRENTLY  
HURRICANE WILLA WILL COMBINE WITH THESE FEATURES TO HELP  
STRENGTHEN THE SURFACE LOW ALONG THE WESTERN GULF COAST, AND THE  
LOW WILL BEGIN MOVING EASTWARD ALONG THE CENTRAL GULF COAST. THIS  
WILL SHIFT THE HEAVY RAIN EASTWARD TO THE LOWER MISSISSIPPI VALLEY  
AND SOUTHEAST ON THURSDAY. MARGINAL RISKS OF FLASH FLOODING ARE IN  
PLACE FOR THESE AREAS. MUCH BELOW NORMAL TEMPERATURES WILL PERSIST  
IN TEXAS WITH ALL THIS ACTIVE WEATHER.  
 
A SURFACE LOW IS FORECAST TO CONTINUE STRENGTHENING OVER THE NEXT  
COUPLE OF DAYS AS IT MOVES THROUGH THE LOWER GREAT LAKES REGION  
AND THE NORTHEAST, LINGERING OFFSHORE NEAR THE NEW ENGLAND COAST  
ON WEDNESDAY. RAIN SHOWERS ARE EXPECTED FOR THE NEW ENGLAND COAST,  
BUT SNOW IS LIKELY IN THE INTERIOR OF NEW ENGLAND. THOUGH WARM  
TEMPERATURES WILL BE A LIMITING FACTOR AND UNCERTAINTY EXISTS  
REGARDING WHERE THE MOST SNOW WILL FALL, PARTS OF MAINE ARE  
EXPECTED TO RECEIVE 6 TO 8 INCHES OF SNOW BEFORE THE LOW PULLS  
AWAY WEDNESDAY NIGHT. SNOW SHOWERS COULD LINGER INTO THURSDAY  
MORNING DOWNWIND OF THE LOWER GREAT LAKES.  
 
ONE RAINFALL CHANCE IN THE PACIFIC NORTHWEST WILL WRAP UP TUESDAY  
EVENING AS A COLD FRONT CONTINUES MOVING ONSHORE AND EASTWARD.  
RAIN AND SNOW SHOWERS ARE POSSIBLE IN THE NORTHERN ROCKIES THROUGH  
TUESDAY NIGHT. A STRONG LOW PRESSURE SYSTEM WILL MOVE TOWARD  
BRITISH COLUMBIA ON WEDNESDAY, AND ITS ASSOCIATED FRONTS WILL MOVE  
INTO THE PACIFIC NORTHWEST ON WEDNESDAY NIGHT AND THURSDAY. THIS  
PLUS STRONG ONSHORE FLOW WILL INCREASE RAIN CHANCES ONCE AGAIN FOR  
THE PACIFIC NORTHWEST AND INTO THE NORTHERN ROCKIES ON THURSDAY.  
LIGHT SNOW IS POSSIBLE IN HIGHER ELEVATIONS.  
 
ELSEWHERE, RAIN SHOWERS ARE EXPECTED FOR THE NORTHERN AND CENTRAL  
PLAINS AND INTO THE UPPER MIDWEST AHEAD OF A SURFACE LOW PRESSURE  
SYSTEM. A COLD HIGH PRESSURE SYSTEM AT THE SURFACE WILL LEAD TO  
CONTINUED BELOW NORMAL TEMPERATURES IN THE EASTERN U.S. THE  
WESTERN U.S., ON THE OTHER HAND, WILL SEE TEMPERATURES THAT ARE  
ABOVE NORMAL THROUGH THE NEXT FEW DAYS.  
 
TATE  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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