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2024 Hennepin County All -Jurisdiction Hazard Mitigation Plan
<br />Volume 2 — Hazard Inventory
<br />4.3.4.7. Historical (statistical) data/previous occurrence
<br />May 6, 1965: Most widespread, intense, and long-lasting hail event on record in Twin Cities. Although
<br />May 6, 1965, is best known for its devastating tornadoes in the Twin Cities, the storms also produced
<br />destructive hail for an unusually long duration and over an unusually large area. Hail the size of ping
<br />pong balls, golf balls, tennis balls and baseballs were
<br />reported throughout the evening, in association with both
<br />the tornadic storms and the many non-tornadic
<br />thunderstorms cells. The largest hail stones were reported
<br />in Hennepin County, generally inside what is now the 494 ,
<br />694 corridor. Hail reports were received before the first �
<br />tornado confirmations, and well after even the last �_f"' -�`r
<br />suspected tornado, and the hail event lasted- „
<br />«M,
<br />approximately six hours. Many areas were hit by
<br />tornadoes early in the evening, and destructive hail later"r .
<br />r
<br />in the evening,and some locations were hit by three
<br />distinct waves of hail larger than golf balls. Locations in )
<br />Hennepin County reporting golf ball or larger hail include
<br />Minneapolis, Bloomington, St. Louis Park, New Hope,,.,,,p
<br />Brooklyn Center, Maple Grove, Brooklyn Park, Edina,'
<br />Deephaven, Crystal, and Eden Prairie.
<br />May 15, 1998: Derecho hailstorm
<br />A severe squall line developed in western Texas around
<br />midnight and raced northeastward, making it to south-
<br />central Kansas by daybreak, southwestern Iowa by mid- Wind (blue), hail (green), and tornadoes
<br />morning, and the Twin Cities area by 16:00 local time. The (red) reported on May 15, 1998. Generated
<br />storms produced widespread damaging wind along the from Severe Plot 3.0 (see references).
<br />1000-mile-long track, and reached peak intensity in Iowa,
<br />Minnesota, and Wisconsin, with fast-moving tornadoes and 1-2" hail driven by 60-80 mph winds.
<br />The storms produced a record number of power outages in Minnesota (the record has since been
<br />broken twice), and snapped or uprooted hundreds of trees in Hennepin County alone (with estimates
<br />of over 1000 trees killed in
<br />Ramsey County). A tornado
<br />tracked from Roseville into
<br />Blaine, at an estimated speed of
<br />80 mph, causing significant
<br />damage to homes. Most of the
<br />damages however, were from
<br />the hail, which broke windows,
<br />damaged roofs bent garagef/,
<br />doors and forced automobile -
<br />�i r ,
<br />Intl
<br />r r ICJ � 9 bY'�iri/
<br />dealerships in Bloomington to
<br />r
<br />submit claims for their entire
<br />outdoor inventories. I Radar at 16:25 local, as bowing hail core entered central Twin Cities
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