

731 

WWUS20 KWNS 010034

SEL5

SPC WW 010034

INZ000-MIZ000-OHZ000-LEZ000-LMZ000-010900-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 45

NWS Storm Prediction Center Norman OK

735 PM EST Tue Feb 28 2017



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Northern Indiana

  Southern Lower Michigan

  Northwestern Ohio

  Lake Erie

  Lake Michigan



* Effective this Tuesday night and Wednesday morning from 735 PM

  until 400 AM EST.



* Primary threats include...

  Scattered large hail and isolated very large hail events to 2

    inches in diameter possible

  Isolated damaging wind gusts to 70 mph possible

  A tornado or two possible



SUMMARY...Multiple rounds of thunderstorms are expected to spread

across this region north of a warm front, offering the potential for

large hail and isolated strong-severe gusts.  A tornado cannot be

ruled out later tonight over parts of northern Indiana as well, but

that threat is more conditional and uncertain at this time.  See SPC

mesoscale discussion 222 for initial meteorological reasoning.



The severe thunderstorm watch area is approximately along and 55

statute miles north and south of a line from 30 miles southwest of

Benton Harbor MI to 15 miles east southeast of Detroit MI. For a

complete depiction of the watch see the associated watch outline

update (WOUS64 KWNS WOU5).



PRECAUTIONARY/PREPAREDNESS ACTIONS...



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

tornadoes.



&&



OTHER WATCH INFORMATION...CONTINUE...WW 41...WW 42...WW 43...WW

44...



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 450. Mean storm motion vector

26035.



...Edwards

