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URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 315
NWS Storm Prediction Center Norman OK
800 PM CDT Sun Jun 11 2017
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
South-central Upper Michigan
North-central and northeastern Wisconsin
* Effective this Sunday night and Monday morning from 800 PM
until 300 AM CDT.
* Primary threats include...
Isolated damaging wind gusts to 70 mph possible
Isolated large hail events to 1.5 inches in diameter possible
A tornado or two possible
SUMMARY...A slowly organizing band of strong-severe thunderstorms
will move eastward across the watch area as the air mass
destabilizes north of a retreating outflow boundary. Activity
occasionally will produce damaging gusts and severe hail. A tornado
or two cannot be ruled out, but the threat is very
conditional/short-lived given the messy convective mode.
The severe thunderstorm watch area is approximately along and 95
statute miles east and west of a line from 15 miles southeast of
Mosinee WI to 15 miles north northeast of Iron Mountain MI. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU5).
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
AVIATION...A few severe thunderstorms with hail surface and aloft to
1.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 550. Mean storm motion vector