⚠️ Special Weather Statement – North Sioux; South Sioux; Niobrara County; Goshen County – Monday, June 29, 2026

Special Weather Statement issued June 28 at 11:55PM MDT by NWS Cheyenne WY

Details

At 1155 PM MDT, Doppler radar was tracking a strong thunderstorm 12
miles southwest of Agate Fossil Beds National Monument, or 19 miles
northeast of Torrington, moving northeast at 40 mph.

HAZARD…Wind gusts up to 50 mph and penny size hail.

SOURCE…Radar indicated.

IMPACT…Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor hail damage to vegetation is
possible.

Locations impacted include…
Harrison, Van Tassell, Agate Fossil Beds National Monument, and Fort
Robinson State Park.

Instructions

If outdoors, consider seeking shelter inside a building.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

This alert was automatically posted by SkyGuard, MWSC’s severe weather alerting system. Source: National Weather Service.