On January 27th and 28th back in 2009, a significant sleet storm
tracked over western north Texas, up through southern and central
Oklahoma. Most of this sleet affected areas near and southeast of
Interstate-44, from near Wichita Falls, Texas, up through Duncan,
Chickasha, Purcell, Shawnee, Seminole, and Holdenville. Up to 4
inches of sleet accumulated on top of a quarter-inch of ice.
From NWS-Norman