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WWUS20 KWNS 201911

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URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 440

NWS Storm Prediction Center Norman OK

215 PM EST Thu Dec 20 2018



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  East-Central and South Florida including the Keys

  Coastal Waters



* Effective this Thursday afternoon and evening from 215 PM until

  900 PM EST.



* Primary threats include...

  Scattered damaging wind gusts to 70 mph possible

  A tornado or two possible



SUMMARY...A line of strong to severe thunderstorms will progress

across the watch area this afternoon and evening, posing a risk of

damaging wind gusts.  An isolated tornado or two is also possible.



The severe thunderstorm watch area is approximately along and 60

statute miles east and west of a line from 35 miles southeast of Key

West FL to 45 miles east northeast of Melbourne FL. For a complete

depiction of the watch see the associated watch outline update

(WOUS64 KWNS WOU0).



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 439...



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

0.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A

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

24040.



...Hart

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