

951 

WWUS20 KWNS 202135

SEL3

SPC WW 202135

IAZ000-KSZ000-NEZ000-210400-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 453

NWS Storm Prediction Center Norman OK

440 PM CDT Fri Aug 20 2021



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Southwestern Iowa

  Northeastern Kansas

  Eastern Nebraska



* Effective this Friday afternoon and evening from 440 PM until

  1100 PM CDT.



* Primary threats include...

  Scattered damaging wind gusts to 70 mph possible

  Isolated large hail events to 1.5 inches in diameter possible

  A tornado or two possible



SUMMARY...Scattered severe storms are expected along and ahead of a

cold front across eastern Nebraska and northeastern Kansas through

late evening.  The storm environment favors a mix of supercells and

multicell clusters capable of producing damaging winds and isolated

large hail.  The stronger embedded supercells/circulations may

produce an isolated tornado or two through early evening.



The severe thunderstorm watch area is approximately along and 60

statute miles east and west of a line from 25 miles northwest of

Denison IA to 25 miles west southwest of Manhattan KS. For a

complete depiction of the watch see the associated watch outline

update (WOUS64 KWNS WOU3).



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 451...WW 452...



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 600. Mean storm motion vector

27025.



...Thompson

