Niobrara storm history

As much as eight inches of rain fell from slow moving thunderstorms across south and southeast Niobrara County during the predawn hours, which resulted in widespread flash flooding. Excessive runoff upstream into the Niobrara River and nearby creeks caused them to overflow their …

Emergency manager reports baseball size hail. Multiple reports of broken windows in homes and vehicles.

Emergency manager reports quarter size hail. Report came from just outside the main hail core of the storm.

Numerous spotter reports of funnels and occasional touchdowns.

Multiple reports of funnel clouds and brief tornado near Manville. Verified with pictures, with location and time estimated by radar. Rated EF-U in coordination with emergency management.

WYDOT mesonet station along US Highway 20 near Van Tassell (WY60) reported wind gust.

A trained weather spotter estimated wind gusts between 70 and 80 MPH.

The public reported significant hail accumulation between 3 and 6 inches deep along Highway 18 between Manville and Lusk.

Local Emergency Management reported nickel to quarter sized hail along US Highway 85, 10 miles NNE of Lusk.

The public reported tennis ball sized hail 15 miles NE of Lusk.

The public reported racquetball sized hail 12 miles NE of Lusk.

Hail reports ranged from pea to ping pong ball size.

Quarter sized hail. Visibility 50 yards in mostly hail.

CoCoRaHS observer located 12.1N Manville reported 2 inch hail resulting in damage to cars and roof shingles.

Emergency manager reported quarter size hail along US-18 north of Lusk between mile markers 153 and 155.

Spotter estimated 75 mph winds with wind driven half dollar size hail.

Emergency manager estimated winds of 70 to 80 mph across the town of Lusk. Cedar tree (80 feet tall) reported broken in half.

Niobrara County Emergency Manager reported 3 inches of rain in Manville that flowed east into the Niobrara River that runs into Lusk. Niobrara River in Lusk was out of its banks.

Trained weather spotters observed quarter sized hail 3 miles NNE of Van Tassel.

A trained spotter reported drifts of penny to quarter sized hail approximately 9 miles south of Lusk.

Received report of strong winds causing a parked camper to move.

Nickel size hail accumulation of 3-4 inches 6 miles south of Lusk along US Highway 85.

Tree limbs (3-inch diameter) broken off numerous trees.

Reports of shredded leaves and car dents.

Quarter-sized hail reported west of Manville along Highway 20.

Quarter-sized hail reported north of Manville.

Quarter size hail was reported at mile marker 48 on US Highway 20.

Wyoming Department of Transportation sensor along United States Highway 20 at Van Tassell measured the outflow winds from the thunderstorm to its east.

Wyoming Department of Transportation sensor three miles west of Van Tassell along United States Highway 20 measured the reported thunderstorm wind gust.

Wyoming Department of Transportation sensor located roughly three and a half miles from Van Tassell measured the reported wind speed.