DENVER — A powerful spring storm dropped more than a foot of sloppy, wet snow in parts of Colorado and Wyoming on Mother’s Day, and forecasters warned that instability ahead of the cold front created conditions ripe for tornadoes and severe thunderstorms in the Plains states.
The National Weather Service issued a winter storm warning for most of northern Colorado and parts of southern Wyoming for all of Sunday and Monday morning. Strong thunderstorms and tornadoes developed in Nebraska and were threatening to push south Sunday. The storm also created high winds across the West.
Kyle Fredin, a meteorologist for the weather service in Boulder, said the weather pattern is typical for this time of year, and ‘‘it’s going to be kind of the same thing pretty much through the end of June.’’
Several tornadoes were reported in southeastern Nebraska, the weather service said, blowing down outbuildings and damaging power poles and irrigation systems. Large hail and strong winds in the state were expected to head south into Kansas and a tornado watch was issued for parts of Oklahoma.
In Colorado, Department of Transportation officials said plunging temperatures and heavy, wet snow have created icy conditions and forced several closures along Interstate 70 west of Denver on Sunday afternoon. Multiple accidents were reported on the mountain corridor, frustrating skiers and snowboarders eager to get a few more runs in before the season ends.
Authorities also closed parts of Interstate 25 because of several accidents Sunday.
Snow amounts could vary greatly, but up to 15 inches could fall at higher elevations and 4 to 9 inches could fall at lower elevations, including Denver and other cities along Colorado’s Front Range.
“If we see the total accumulations that we are anticipating from this storm, we are certainly going to see a top 10 May snow event for the Denver metro area.’’ said David Barjenbruch, another weather service meteorologist in Boulder.