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282 

WWUS20 KWNS 202021

SEL4

SPC WW 202021

INZ000-KYZ000-TNZ000-210300-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 254

NWS Storm Prediction Center Norman OK

320 PM CDT Sat May 20 2017



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Southern Indiana

  Central Kentucky

  Middle Tennessee



* Effective this Saturday afternoon and evening from 320 PM until

  1000 PM CDT.



* Primary threats include...

  Scattered damaging wind gusts to 65 mph possible

  Isolated large hail events to 1.5 inches in diameter possible

  A tornado or two possible



SUMMARY...A line of strong storms is moving slowly eastward from

southern Indiana into middle Tennessee.  Some storms are expected to

intensify into the evening hours as they move into a very warm and

moist air mass.  A few damaging wind gusts and occasional hail are

the primary threats.



The severe thunderstorm watch area is approximately along and 45

statute miles east and west of a line from 35 miles north northwest

of Louisville KY to 55 miles south of Nashville TN. For a complete

depiction of the watch see the associated watch outline update

(WOUS64 KWNS WOU4).



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 253...



AVIATION...A few severe thunderstorms with hail surface and aloft to

1.5 inches. Extreme turbulence and surface wind gusts to 55 knots. A

few cumulonimbi with maximum tops to 500. Mean storm motion vector

20030.



...Weiss

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