

810 

WWUS20 KWNS 132020

SEL2

SPC WW 132020

IAZ000-140200-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 42

NWS Storm Prediction Center Norman OK

325 PM CDT Fri Apr 13 2018



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Central Iowa



* Effective this Friday afternoon and evening from 325 PM until

  900 PM CDT.



* Primary threats include...

  Scattered large hail likely with isolated very large hail events

    to 2 inches in diameter possible

  Isolated damaging wind gusts to 60 mph possible



SUMMARY...Scattered thunderstorms are expected to develop and spread

across the watch area this afternoon and early evening.  These

storms will track atop a cold/stable surface layer, with large hail

being the primary threat.



The severe thunderstorm watch area is approximately along and 35

statute miles north and south of a line from 85 miles west northwest

of Des Moines IA to 80 miles east northeast of Des Moines IA. For a

complete depiction of the watch see the associated watch outline

update (WOUS64 KWNS WOU2).



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 39...WW 40...WW 41...



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

2 inches. Extreme turbulence and surface wind gusts to 50 knots. A

few cumulonimbi with maximum tops to 450. Mean storm motion vector

22035.



...Hart

