Living in Southeast Minnesota, you know the weather can be unpredictable in winter and summer (to say the least) and harsh. But not all severe storms are the same, so from August 2, 2021, the The National Weather Service (NWS) added a “threat of damage” to severe thunderstorm warnings (as they do to tornado and flash flood warnings).
There are three categories of severe thunderstorm warning damage
According to the NWS,
Criteria for a threat of destructive damagestorm
- Criteria for a threat of considerable damage is at least 1.75 inches in diameter (the size of a golf ball) from hail and / or thunderstorm winds of 70 mph. This will not activate a WEA.
- The criteria for a basic or “basic” severe thunderstorm warning unchanged, 1.00 inch (quarter size) hail and / or thunderstorm winds of 58 mph. This will not activate a WEA. When no damage threat label is present, damage should be at base level.
Nationally, only 10% of all severe thunderstorms reach destructive levels. Most of us probably remember “the costliest thunderstorm in US history, the $ 11 billion derecho that hit Iowa in August 2020”.
Learn how to stay safe in a severe thunderstorm by clicking here.
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Do you remember the Derecho in Iowa?
From August 19, 2020 –
New estimate of 140 MPH Derecho Gust at Cedar Rapids
Cedar Rapids, IA (KROC-AM News) – The National Weather Service now estimates that wind gusts of around 140 miles per hour hit sections of Cedar Rapids, during last week’s catastrophic windstorm Derecho.
The updated estimate is based on an inspection of damage to an apartment complex in the southwestern part of eastern Iowa. The National Weather Service says it’s comparable to the winds produced by an EF-3 tornado.
While the 140 mph gust is an estimate, the National Weather Service also reports that there was a measured gust of 126 mph in the town of Aitkin, just west of Cedar Rapids. This set a new record for the highest tornado-free wind on record in Iowa.
The National Weather Service website says the previous record of 123 miles per hour was set in an area south of Cedar Rapids when another devastating Derecho passed through Iowa on June 29, 1998.
Mid-September 2018 A Twister near Zumbrota
As reported on KROC NEWS…
According to National Weather Service reports, the most severe weather and damage occurred in an area stretching from Faribault, Owatonna and Waseca, passing through West Concord, Northfield and Cannon Falls and Red Wing.
Reports include damaged or destroyed buildings, large numbers of downed trees and power outages. Significant damage was reported at Faribault Airport. Wind gusts of up to 70 mph were reported in the storm area, as were several suspected tornadoes.
Below are some of the images submitted by listeners.
The Storm – 09/20/18
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Photos from the devastating Duluth windstorm in July 2016
Duluth woke up in devastation on the morning of July 21, 2016. Thousands of people were without power for days as a severe thunderstorm brought extreme winds to the area. Many trees were blown all over the city, as well as damage to buildings.