Temperatures on Monday night and early Tuesday morning were very low- and stayed there over a large area of Oklahoma for an extended time.
Courtesy of Al Sutherland and the folks at the Oklahoma Mesonet- here are three maps that show us the hours below 32 degrees, 28 degrees and 24 degrees across the state- all of these maps reflect the period from 12:00 PM April 6 to 10:00 AM April 7
