A SNOW SQUALL WARNING REMAINS IN EFFECT UNTIL 730 AM EST FOR SOUTHEASTERN BEAVER...SOUTHEASTERN VENANGO...NORTHWESTERN WASHINGTON...BUTLER...NORTHWESTERN ALLEGHENY...NORTHWESTERN JEFFERSON...NORTHWESTERN ARMSTRONG...CLARION AND SOUTHERN FOREST COUNTIES... At 712 AM EST, a hazardous snow squall was located along a line extending from near Marienville to 12 miles northeast of Shanor- Northvue to near Imperial, moving east at 35 mph. HAZARD...Intense bursts of heavy snow. Gusty winds leading to blowing snow and rapidly falling visibility. Wind gusts greater than 35 mph. SOURCE...Radar indicated. IMPACT...Travel will become difficult and potentially dangerous within minutes. This includes the following highways... Pennsylvania Turnpike between mile markers 20 and 42. Interstate 79 in Pennsylvania between mile markers 54 and 93. Interstate 80 in Pennsylvania between mile markers 41 and 76. Parkway North between mile markers 3 and 13. Interstate 376 in Pennsylvania between mile markers 39 and 66. Locations impacted include... Pittsburgh, Ross Township, McCandless Township, Cranberry, Moon Township, Butler, Franklin Park, Aliquippa, Monaca, Clarion, Marienville, Knox, Rimersburg, Shaler Township, Hampton Township, Scott Township, Robinson Township, Cecil-Bishop, Economy, and Bellevue. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow Down! Rapid changes in visibility and road conditions are expected with this dangerous snow squall. Be alert for sudden whiteout conditions. Reduce speed and turn on headlights! During snow squalls, the visibility may suddenly drop to near zero in whiteout conditions. SNOW SQUALL...RADAR INDICATED