Oklahoma Heavy Snow Events

The values on the above map represent the number of heavy snow events which produced four-inch or greater storm totals over at least a part of the county. The contour lines on the above map are to designate the average time between 4" snowfall events.

 Which quadrant of the state would best be described as averaging a heavy snow event every 1.5 years?

1. SE
2. NE
3. NW
4. SE