797  
WWUS84 KHUN 210136  
SPSHUN  
 
SPECIAL WEATHER STATEMENT  
NATIONAL WEATHER SERVICE HUNTSVILLE AL  
736 PM CST SAT FEB 20 2021  
 
ALZ001>006-TNZ076-096-211400-  
LAUDERDALE-COLBERT-FRANKLIN AL-LAWRENCE-LIMESTONE-MADISON-MOORE-  
LINCOLN-  
736 PM CST SAT FEB 20 2021  
 
...SIGNIFICANT WEATHER ADVISORY FOR BLACK ICE AND PATCHY FREEZING  
FOG ACROSS NORTHWEST ALABAMA, AS WELL AS PORTIONS OF NORTH CENTRAL  
ALABAMA AND SOUTHERN MIDDLE TENNESSEE...  
 
SNOW MELT AND WATER RUNOFF THAT OCCURRED EARLIER TODAY WILL RESULT  
IN PATCHES OF BLACK ICE ON A NUMBER OF AREA ROADWAYS OVERNIGHT, AS  
TEMPERATURES FALL BELOW FREEZING. BRIDGES AND OVERPASSES, ESPECIALLY  
THOSE CROSSING THE TENNESSEE RIVER, ARE ESPECIALLY AT RISK.  
 
IN ADDITION TO THE THREAT FOR FROZEN WATER ON ROADS, PATCHY FREEZING  
FOG MAY ALSO DEVELOP LATER THIS EVENING ACROSS PORTIONS OF THE  
ADVISORY AREA. THIS FOG WILL BE CAPABLE OF DEPOSITING A THIN LAYER OF  
ICE ON EXPOSED SURFACES. AGAIN, BRIDGES, OVERPASSES, AND ELEVATED  
HIGHWAYS ARE MOST AT RISK.  
 
BLACK ICE CAN BE ESPECIALLY DANGEROUS BECAUSE YOU MAY NOT BE ABLE TO  
SEE IT UNTIL YOU HAVE ALREADY ENCOUNTERED IT. IF TRAVELING, USE  
EXTREME CAUTION, ESPECIALLY ON BRIDGES, OVERPASSES, AND ELEVATED  
HIGHWAYS WHERE WATER FREEZES FIRST. DO NOT ASSUME THAT A WELL  
TRAVELED ROAD WILL BE FREE OF ICE.  
 
THE THREAT FOR BLACK ICE AND PATCHY FREEZING FOG WILL END BY 8 AM  
CST, AS TEMPERATURES RISE ABOVE FREEZING.  
 

 
 
70/DD  
 
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