Another Derecho, This Time In Midwest, And Yellowstone Drowns

All those blue and black dots extending from Wisconsin
 to West Virginia represent storm damage reports from
an apparent derecho yesterday and last night. 

 Along the western, northern and eastern edges of big heat waves, you often see violent thunderstorms, the so called "Ring Of Fire" I talked about earlier this week. 

That is certainly the case with the current record heat wave gripping the middle and south of the nation. An apparent derecho formed yesterday afternoon, bringing winds gusts of up to 84 mph at Chicago's O'Hare Airport and a 98 mph gust to Fort Wayne, Indiana.

Meanwhile, out on the northwest edge of the heat, an unprecedented flood hit areas in and near Yellowstone National Park.

DERECHO

It's already been a bad year for derechos, which are defined as damaging and dangerous thunderstorm complexes that travel at least 240 miles, spreading destruction along the way. 

I don't think it's been officially declared yet, but it's apparent a derecho originated in southern Wisconsin Monday afternoon, then roared southeastward through the Chicago area, Indiana, Ohio and into West Virginia. 

NOAA's Storm Prediction Center logged 382 thunderstorm wind reports yesterday and last night, most of them in the Wisconsin to West Virginia swath. 

In Chicago, tornado sirens blared and echoed around downtown skyscrapers. No tornado is known so far to have touched down, but there was plenty of wind damage with those 84 mph gusts. Many cars and houses were damaged by falling trees. The roof of a three story apartment building peeled away. 

Travelers at O'Hare were ordered into below ground shelters or packed themselves into rest rooms, which double as tornado shelters. The air traffic control tower was evacuated, there was obviously a ground stop on all flights, so everything was and still is badly disrupted. Some planes had to be checked for hail damage before being allowed to fly. 

At least 44,000 people were without power. Some won't have their power back until after today. Record heat and humidity is forecast today in Chicago.

That 98 mph wind gust in Fort Wayne is the strongest ever recorded in that city. A SkyWest hangar near the airport was blown to pieces.  Extensive tree damage and widespread power outages continued on into Ohio and parts of West Virginia. All these areas are under the gun for record heat today. Many people will have to endure the heat without air conditioning. 

If last night's weather is confirmed as a derecho, it will already be the third destructive and deadly one to hit North America this year. On May 12, a derecho, accompanied by dust storms struck South Dakota and neighboring parts of Nebraska, Iowa and Minnesota, killing two people and causing widespread damage, including the South Dakota cities of Sioux Falls, Watertown and Brookings.

Another derecho in southern Ontario and Quebec hit the most populated section of Canada on May 21 causing at least ten deaths in towns near Toronto and Ottawa. 

Part of a house falls into a flooding river in Gardiner, Montana
Monday during unprecedented flooding in and near 
Yellowstone National Park. Photo by Steve Rupho via CNN

YELLOWSTONE FLOOD

On the northwest side of the heat wave, high temperatures rapidly melted mountain snows, and torrential thunderstorms swept through areas around Yellowstone.  The combination caused unprecedented flooding in rivers across northwestern Wyoming and parts of Montana.

Yellowstone National Park was completely shut down by the flooding. The torrents swept away bridges, collapsed roads, washed away or flooded cabins and homes and stranded an unknown number of tourists. 

Luckily, the rain there is tapering off and temperatures are cooling, but the damage is done.

VERMONT IMPACTS

The Green Mountain State continues to be one of the few areas in the nation with benign weather. We have gorgeous days today and tomorrow with sunshine, seasonably warm temperatures and low humidity.

Thursday looks a bit more humid, and we'll probably see some showers and thunderstorms later Thursday into Friday. But this still looks like it won't be anything extreme. Forecasts are also steady for an unusually cool weekend and early next week.