807  
FXUS01 KWBC 071957  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
256 PM EST THU DEC 07 2017  
 
VALID 00Z FRI DEC 08 2017 - 00Z SUN DEC 10 2017  
 
...LIGHT ACCUMULATING SNOWFALL POSSIBLE ACROSS PARTS OF SOUTHERN  
TEXAS, THE INTERIOR SOUTHEAST, AS WELL AS THE MID-ATLANTIC WITH  
HEAVY RAINFALL POSSIBLE ELSEWHERE ACROSS THE DEEP SOUTH...  
 
...LOCALLY HEAVY LAKE EFFECT SNOWFALL TO CONTINUE TONIGHT DOWNWIND  
OF THE GREAT LAKES...  
 
...CRITICAL TO EXTREME FIRE WEATHER CONDITIONS EXPECTED TO PERSIST  
ACROSS PORTIONS OF SOUTHERN CALIFORNIA AND SOUTHERN ARIZONA...  
 
WITH THE PRESENCE OF A DEEP UPPER LEVEL TROUGH, DAYTIME  
TEMPERATURES WILL REMAIN CHILLY FOR LOCATIONS EAST OF THE ROCKIES  
AND ESPECIALLY ACROSS THE SOUTH. FROM THE SOUTHERN HIGH PLAINS TO  
THE DEEP SOUTH, AFTERNOON HIGH TEMPERATURES COULD BE AS MUCH AS 10  
TO 20 DEGREES BELOW NORMAL. THE COLD TEMPERATURES COMBINED WITH  
ENERGY MOVING THROUGH ALOFT WILL CONTINUE TO ALLOW FOR  
ACCUMULATING SNOWS ACROSS PORTIONS OF SOUTHWEST TEXAS, WHERE  
WINTER STORM WARNINGS AND WINTER WEATHER ADVISORIES ARE IN EFFECT  
FOR UP TO 6 INCHES OF SNOW. FARTHER EAST, MODERATE TO HEAVY  
RAINFALL ACROSS THE SOUTHERN PLAINS AND INTO THE DEEP SOUTH WILL  
CONTINUE TONIGHT AND INTO TOMORROW AS A SURFACE BOUNDARY STALLS  
ACROSS THE NORTHERN GULF OF MEXICO AND CENTRAL FLORIDA. THE  
POSSIBILITY REMAINS FOR A CHANGEOVER TO SNOW OVERNIGHT TONIGHT AND  
EARLY TOMORROW MORNING ON THE BACK EDGE OF THIS PRECIPITATION  
SHIELD FROM SOUTH TEXAS TO PARTS OF THE INTERIOR GULF COAST.  
WINTER WEATHER ADVISORIES ARE IN EFFECT ACROSS SOUTHERN TEXAS, AS  
WELL AS FROM SOUTHEAST LOUISIANA TO CENTRAL ALABAMA FOR THE  
POSSIBILITY OF MINOR ACCUMULATIONS. BY SATURDAY, A SURFACE LOW  
DEVELOPING ALONG THE FRONT AND MOVING INTO THE WESTERN ATLANTIC  
COULD BRING MAINLY LIGHT ACCUMULATING SNOWS TO INTERIOR PORTIONS  
OF THE MID-ATLANTIC AS WELL.  
 
TO THE NORTH, COLD AIR MOVING OVER THE STILL RELATIVELY WARM LAKES  
WILL ALLOW FOR MODERATE TO LOCALLY HEAVY SNOWFALL TO CONTINUE  
TONIGHT IMMEDIATELY DOWNWIND OF THE GREAT LAKES WHERE WINTER STORM  
WARNINGS, ADVISORIES, AND LAKE EFFECT SNOW WARNINGS ARE IN EFFECT.  
A SURFACE LOW DROPPING INTO THE REGION ON FRIDAY MAY ALSO BRING  
ADDITIONAL LIGHT SNOWS TO PARTS OF THE GREAT LAKES, UPPER MIDWEST,  
AND THE OHIO VALLEY.  
 
FINALLY, AMPLIFIED UPPER-LEVEL RIDGING ACROSS THE WESTERN U.S.  
WILL CONTINUE THE WARM AND DRY PATTERN THROUGH AT LEAST THE  
WEEKEND. GUSTY WINDS WILL KEEP DANGEROUS FIRE WEATHER CONDITIONS  
ELEVATED ACROSS PARTS OF SOUTHERN CALIFORNIA AND INTO SOUTHERN  
ARIZONA. WILDFIRES ACROSS THIS REGION ARE ONGOING AND A CRITICAL  
TO EXTREME RISK IS EXPECTED TO CONTINUE TODAY AND INTO TOMORROW,  
WITH RED FLAG AND HIGH WIND WARNINGS IN EFFECT. PLEASE MONITOR  
PRODUCTS ISSUED BY THE LOCAL WEATHER FORECAST OFFICES ACROSS THOSE  
AREAS FOR ADDITIONAL INFORMATION.  
 
SANTORELLI  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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