Brief Heavy Snow Expected this Afternoon ... At 330 PM...A line of brief heavy snow extends across western South Dakota from Lemmon to Union Center to Rapid City to Custer to Hot Springs. This snow squall was moving east at 15 mph and should only last for a few hours. Wind gusts of 40 to 50 mph will accompany the snow, which will reduce the visibility. LOCATIONS IMPACTED INCLUDE... Rapid City, Spearfish, Sturgis, Belle Fourche, Hot Springs, Pine Ridge, Lead, Custer, Lemmon, Hill City, Edgemont, Dupree, Faith, Rapid Valley, Ellsworth Air Force Base, Box Elder, Black Hawk, Summerset, Oglala and Deadwood. This Includes Interstate 90 in South Dakota between Mile Markers 5 and 133. USE EXTRA CAUTION IF YOU MUST TRAVEL INTO OR THROUGH THIS DANGEROUS SNOW SQUALL. RAPID CHANGES IN VISIBILITY IS LIKELY TO LEAD TO ACCIDENTS. CONSIDER DELAYING TRAVEL UNTIL THE SQUALL PASSES YOUR LOCATION.