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WWUS20 KWNS 220145

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ARZ000-LAZ000-MSZ000-220900-



URGENT - IMMEDIATE BROADCAST REQUESTED

Tornado Watch Number 18

NWS Storm Prediction Center Norman OK

745 PM CST Sat Jan 21 2017



The NWS Storm Prediction Center has issued a



* Tornado Watch for portions of

  Southeastern Arkansas

  Northeastern Louisiana

  Central and southern Mississippi



* Effective this Saturday night and Sunday morning from 745 PM

  until 300 AM CST.



* Primary threats include...

  A few tornadoes and a couple intense tornadoes likely

  Scattered large hail and isolated very large hail events to 2.5

    inches in diameter possible

  Scattered damaging wind gusts to 70 mph possible



SUMMARY...A warm front will cross the region beneath strong vertical

shear.  In that setting, clusters of severe thunderstorms, including

supercells, are forecast to move across the watch area overnight,

offering large hail, damaging gusts and at least a few tornadoes.

Some potential also exists for significant tornadoes (capable of EF2

or worse damage).



The tornado watch area is approximately along and 70 statute miles

north and south of a line from 50 miles south southwest of

Monticello AR to 20 miles east southeast of Meridian MS. For a

complete depiction of the watch see the associated watch outline

update (WOUS64 KWNS WOU8).



PRECAUTIONARY/PREPAREDNESS ACTIONS...



REMEMBER...A Tornado Watch means conditions are favorable for

tornadoes and 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.



&&



OTHER WATCH INFORMATION...CONTINUE...WW 15...WW 16...WW 17...



AVIATION...Tornadoes and a few severe thunderstorms with hail

surface and aloft to 2.5 inches. Extreme turbulence and surface wind

gusts to 60 knots. A few cumulonimbi with maximum tops to 450. Mean

storm motion vector 25030.



...Edwards

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