Strange Weather In The U.S. :

Tens of Thousands Without Power After Exceedingly Rare Derecho Makes Weather History in Wyoming and Colorado – That’s Only the Third Derecho Recorded in Western U.S. (Videos)

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Three days after a severe derecho killed three and cut power to half a million people across Pennsylvania and New Jersey, another powerful derecho storm, packing winds in excess of 75 mph, moved across Wyoming and Colorado Saturday, damaging homes and knocking down trees and power lines.

@NWSSPC

Yesterday's (6/6) derecho produced the most significant wind gust reports in a day (from prelim SPC storm report counts).

Sig wind gusts are estimated or measured severe wind gusts of 75 mph or greater.

Even more impressive, 41 of the 44 significant wind gusts were measured.

The storms produced several hurricane-force wind gusts, including a 110 mph gust in Winter Park, Colorado, according to the National Weather Service. Winds up to 99 mph were reported in Great Divide, Colorado, and 81 mph in Rock Springs, Wyoming. A 78 mph wind gust was reported at Denver International Airport.

The rare derecho made Colorado weather history:

Enough significant wind gusts were recorded on Saturday that a record was set for most significant wind gusts in one calendar day.

The derecho, a strong line of thunderstorms that produces hundreds of miles of straight-line wind damage, developed in far eastern Utah Saturday morning, then raced northeastward across Colorado and Wyoming into the western Dakotas and western Nebraska during the afternoon and evening hours, a track of at least 750 miles in about 12 hours, according to Elizabeth Leitman, a meteorologist with NOAA’s Storm Prediction Center.

Anomalous June Snow in the Rockies: Snowplows Deployed in Utah and Wyoming – A Foot of Snow in Idaho and Montana – And We Are Only Two Weeks Away From the Summer Solstice!

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The summer solstice is just under two weeks away, and yet parts of the northern Rockies resemble a scene out of winter on Monday.

The National Weather Service (NWS) Weather Prediction Center (WPC) said heavy snow has developed across parts of Montana, Idaho, and Utah.

Forecasters said an “anomalously cold and vigorous upper trough for early June,” is swinging through the western U.S and northern Plains, bringing the threat for severe weather.

In Utah, UDOT snowplows were dispatched to both Big and Little Cottonwood Canyons, where several inches of snow have fallen causing some pretty big rocks to come down.

“Some of the higher elevations of southwest Montana into the Yellowstone National Park could see heavy snow today before the snow tapers off by tonight,” the WPC said. “The snow will spread into the higher elevations of the central Rockies as well.”

Portions of central and southwest Montana reported power outages due to the heavy, wet snow, MontanaRightNow reported.

Forecasters say snow in the region is highly unusual for June and that people who may be camping are probably not prepared for such conditions. Frozen precipitation typically ends in May across the region.

Wind chills as low as the teens are expected on Monday for central, southwest, and west-central Montana.