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Severe Thunderstorm Watch 478
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WW0478 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Low Very Low
Severe Wind 65 kt+ Wind
High Low
Severe Hail 2"+ Hail
Moderate Low

Note:  The expiration time in the watch graphic is amended if the watch is replaced, cancelled or extended.
Note: Click for Watch Status Reports.
   SEL8

   URGENT - IMMEDIATE BROADCAST REQUESTED
   Severe Thunderstorm Watch Number 478
   NWS Storm Prediction Center Norman OK
   430 PM EDT Mon Sep 4 2017

   The NWS Storm Prediction Center has issued a

   * Severe Thunderstorm Watch for portions of 
     Central and northeastern Indiana
     Southeastern Lower Michigan
     Northwestern Ohio
     Lake Erie
     Lake Huron

   * Effective this Monday afternoon and evening from 430 PM until
     1100 PM EDT.

   * Primary threats include...
     Widespread damaging wind gusts to 70 mph likely
     Isolated large hail events to 1.5 inches in diameter possible

   SUMMARY...Thunderstorm development is expected in the next 1-2 hours
   along a cold front moving southeastward across Lower Michigan and
   northern Indiana.  The storms should evolve rather quickly into a
   line, and the storm environment will favor damaging winds with most
   storms in the squall line through late evening.

   The severe thunderstorm watch area is approximately along and 55
   statute miles north and south of a line from 20 miles north
   northwest of Terre Haute IN to 35 miles southeast of Mount Clemens
   MI. For a complete depiction of the watch see the associated watch
   outline update (WOUS64 KWNS WOU8).

   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.

   &&

   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 500. Mean storm motion vector
   29040.

   ...Thompson
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Page last modified: September 05, 2017
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