At least six tornado sightings were reported in eastern Colorado on Sunday afternoon with at least one storm forecasters called “extremely dangerous.”

The nationwide tornado threat is expected to downshift by Wednesday, with several relatively quiet days in the offing. Late May is still peak season, however, so pockets of severe weather could begin cropping up by the weekend into next week across the Southern Plains.

Storms capable of producing hail the size of baseballs were expected to continue on Monday. Widespread damage was reported on Sunday.