

165 

WWUS20 KWNS 152204

SEL4

SPC WW 152204

COZ000-160400-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 174

NWS Storm Prediction Center Norman OK

405 PM MDT Sat May 15 2021



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  East-central and southeast Colorado



* Effective this Saturday afternoon and evening from 405 PM until

  1000 PM MDT.



* Primary threats include...

  Scattered large hail and isolated very large hail events to 2

    inches in diameter possible

  Isolated damaging wind gusts to 65 mph possible

  A tornado or two possible



SUMMARY...Multiple cells should gradually intensify along the I-25

corridor and spread east towards east-central and southeast

Colorado. While convective mode will most likely evolve into a

loosely organized cluster, strengthening low-level flow towards

sunset renders concern for a brief tornado or two as well.



The severe thunderstorm watch area is approximately along and 70

statute miles east and west of a line from 20 miles north of Limon

CO to 50 miles east southeast of Trinidad CO. 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 172...WW 173...



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

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

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

25025.



...Grams

