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URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 278
NWS Storm Prediction Center Norman OK
1000 PM CDT Thu Jun 17 2021
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
* Effective this Thursday night and Friday morning from 1000 PM
until 400 AM CDT.
* Primary threats include...
Scattered damaging wind gusts to 70 mph likely
Scattered large hail and isolated very large hail events to 2
inches in diameter possible
A tornado or two possible
SUMMARY...Organized clusters of storms are expected to accelerate
east-southeastward across central/southern Wisconsin, while
additional storms develop across southeast Minnesota and northern
Iowa late this evening into the overnight. Damaging winds and severe
hail can be expected through at least the early/middle part of the
The severe thunderstorm watch area is approximately along and 70
statute miles north and south of a line from 35 miles north
northwest of Mason City IA to 35 miles north of Milwaukee WI. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU8).
REMEMBER...A Severe Thunderstorm Watch means conditions are
favorable for severe thunderstorms in and close to the watch area.
Persons in these areas should be on the lookout for threatening
weather conditions and listen for later statements and possible
warnings. Severe thunderstorms can and occasionally do produce
OTHER WATCH INFORMATION...CONTINUE...WW 276...WW 277...
AVIATION...A few severe thunderstorms with hail surface and aloft to
2 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 600. Mean storm motion vector