This is the second RARE derecho within 3 days!
And this time it wreaked havoc in Wyoming and Colorado Saturday.
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.
The extreme storm didn’t turn deadly, but a tree that fell during Colorado’s derecho impaled a man and his daughter.
Yesterday's (6/6) derecho produced the most significant wind gust reports in a day (from prelim SPC storm report counts).— NWS Storm Prediction Center (@NWSSPC) June 7, 2020
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. pic.twitter.com/Tn7Zb2cVnk
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.
The line of storms formed on the southern flank of a developing low pressure system over the northern Rockies and southwestern Canada.
I put together some quick info on Saturday's derecho event. Only two other derechoes in the Great Basin are well noted in literature. I've included storm reports for those events, as well as a derecho frequency map for comparison. Pretty remarkable event! #derecho #wxtwitter pic.twitter.com/d2KZk1Gvmk— Elizabeth Leitman (@WxLiz) June 7, 2020
Derechos are common in June, but are rare in the Rockies where storms can have a more difficult time sticking together until they can reach the flatter plains to the east, where derechos are more common.
According to Leitman, there were only two other Western U.S. derechos documented prior to Saturday, in May 1994 and June 2002.
Near 80 mph winds split massive tree, which crashes onto car in Washington Park, Denver, CO.— Nick Brown (@NickBrownCO) June 6, 2020
Thankfully, woman's car just had back window knocked out & small roof scuff.#COwx@theWXwoman @KathySabine9 @ChrisCBS4 @MikeNelson247 @MattMakens @BianchiWeather @DaveFraserWX pic.twitter.com/808OXi8tEk
More than 63,000 customers were without power as of about 9:30 p.m. EDT, according to poweroutage.us. Nearly 100,000 were without power earlier in the evening.
Photos showed widespread trees down and windows blown out of a home in Littleton.
There was also heavy rainfall, lightning and hail.
Here the article about the Pa and NJ derecho: