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URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 421
NWS Storm Prediction Center Norman OK
330 PM CDT Wed Jul 19 2017
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
* Effective this Wednesday afternoon and evening from 330 PM
until 900 PM CDT.
* Primary threats include...
Widespread damaging winds likely with isolated significant gusts
to 75 mph possible
Scattered large hail likely with isolated very large hail events
to 2 inches in diameter possible
A tornado or two possible
SUMMARY...A fast-moving bow echo over southern MN will track across
the watch area late this afternoon, posing a threat of damaging wind
gusts and perhaps hail.
The severe thunderstorm watch area is approximately along and 35
statute miles north and south of a line from 40 miles southwest of
Rochester MN to 125 miles east southeast of Rochester MN. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU1).
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 420...
AVIATION...A few severe thunderstorms with hail surface and aloft to
2 inches. Extreme turbulence and surface wind gusts to 65 knots. A
few cumulonimbi with maximum tops to 500. Mean storm motion vector