405  
FXUS01 KWBC 121902  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
301 PM EDT FRI OCT 12 2018  
 
VALID 00Z SAT OCT 13 2018 - 00Z MON OCT 15 2018  
 
...MOISTURE FROM THE REMNANTS OF SERGIO WILL SPREAD INTO PORTIONS  
OF THE SOUTHWEST AND SOUTHERN PLAINS FRIDAY NIGHT INTO SATURDAY...  
 
...A STRONG COLD FRONT WILL RACE SOUTH THROUGH THE PLAINS SATURDAY  
& SUNDAY. TEMPERATURES WILL BE 20 TO 30 DEGREES BELOW AVERAGE IN  
THE WAKE OF THIS STRONG COLD FRONT FROM THE ROCKIES INTO THE  
PLAINS THIS WEEKEND. RECORD LOW MAXIMUM TEMPERATURES POSSIBLE  
SUNDAY ACROSS THE MID SECTION OF THE NATION  
 
...HEAVY SNOWS POSSIBLE FROM THE CENTRAL TO SOUTHERN ROCKIES INTO  
THE CENTRAL TO SOUTHERN HIGH PLAINS...  
 
TROPICAL DEPRESSION SERGIO IS EXPECTED TO WEAKEN QUICKLY FRIDAY  
NIGHT/EARLY SATURDAY MORNING AS IT MOVES INLAND OVER NORTHWEST  
MEXICO. THE MOISTURE FROM SERGIO...HOWEVER...WILL PUSH INTO  
PORTIONS OF THE SOUTHWEST AND SOUTHERN PLAINS FRIDAY NIGHT INTO  
SATURDAY. THIS WILL SUPPORT POTENTIAL FOR HEAVY TO LOCALLY  
EXCESSIVE RAINFALL AMOUNTS FROM SOUTHEAST ARIZONA...SOUTHERN NEW  
MEXICO...ACROSS NORTH TEXAS...SOUTHERN OKLAHOMA AND INTO NORTHERN  
ARKANSAS.  
 
IN THE WAKE OF THE MOISTURE FROM SERGIO PUSHING NORTHEASTWARD A  
STRONG MID LATITUDE CLOSED LOW WILL PUSH ACROSS SOUTHERN  
CALIFORNIA SATURDAY AND INTO THE SOUTHWEST SUNDAY. THIS SYSTEM  
WILL SUPPORT ADDITIONAL SHOWER ACTIVITY FROM SOUTHERN CALIFORNIA  
INTO ARIZONA & NEW MEXICO.  
 
ACROSS THE MID SECTION OF THE NATION...A STRONG COLD FRONT WILL  
RACE SOUTHWARD ACROSS THE PLAINS SATURDAY AND SUNDAY.  
TEMPERATURES ARE EXPECTED TO FALL TO 20 TO 30 DEGREES BELOW  
AVERAGE BEHIND THIS FRONT ACROSS THE ROCKIES AND THE PLAINS THIS  
WEEKEND. WITH THIS MUCH BELOW AVERAGE AIR...NUMEROUS RECORD LOW  
MAXIMUM TEMPERATURES ARE POSSIBLE SUNDAY FROM THE UPPER  
MISSISSIPPI VALLEY..INTO THE CENTRAL TO SOUTHERN PLAINS AND  
CENTRAL ROCKIES. IN ADDITION TO THE COLD TEMPERATURES...HEAVY  
SNOWS ARE POSSIBLE ACROSS THE NORTHERN TO CENTRAL ROCKIES AND INTO  
THE NORTHERN AND CENTRAL HIGH PLAINS..INCLUDING CHEYENNE AND  
DENVER.  
 
A STRONG UPPER VORT EXPECTED TO PUSH QUICKLY THROUGH THE OHIO  
VALLEY TONIGHT..INTO THE NORTHERN MID-ATLANTIC SATURDAY AND OFF  
THE SOUTHERN NEW ENGLAND COAST SATURDAY AFTERNOON. GENERALLY  
LIGHT PRECIP AMOUNTS EXPECTED WITH THIS SYSTEM..WITH LOCALLY  
HEAVIER TOTALS SOUTHEAST OF LAKE ERIE AND EAST OF LAKE ONTARIO  
WHERE LAKE EFFECT RAIN SHOWERS WILL ENHANCE AMOUNTS.  
 
ORAVEC  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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