004 

WWUS20 KWNS 130403

SEL0  

SPC WW 130403

COZ000-NEZ000-SDZ000-WYZ000-130500-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH - NUMBER 410 

NWS STORM PREDICTION CENTER NORMAN OK 

1003 PM MDT THU JUN 12 2025



THE NWS STORM PREDICTION CENTER HAS CANCELLED 

SEVERE THUNDERSTORM WATCH NUMBER 410 ISSUED AT 255 PM MDT FOR PORTIONS OF



         COLORADO

         NEBRASKA

         SOUTH DAKOTA

         WYOMING








411 

WWUS20 KWNS 131900

SEL1  

SPC WW 131900

MTZ000-WYZ000-140300-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 411

NWS Storm Prediction Center Norman OK

100 PM MDT Fri Jun 13 2025



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of 

  Central and southeast Montana

  North central Wyoming



* Effective this Friday afternoon and evening from 100 PM until

  900 PM MDT.



* Primary threats include...

  Scattered large hail and isolated very large hail events to 2.5

    inches in diameter likely

  Scattered damaging winds and isolated significant gusts to 75

    mph possible

  A tornado or two possible



SUMMARY...Supercell development is expected this afternoon into

central Montana and storms will spread eastward through late

evening.  Large hail up to 2.5 inches in diameter will be a primary

threat, along with thunderstorm outflow gusts of 60-75 mph.  There

is also a low threat for an isolated tornado or two.



The severe thunderstorm watch area is approximately along and 115

statute miles east and west of a line from 70 miles north of

Lewistown MT to 60 miles south southeast of Billings MT. For a

complete depiction of the watch see the associated watch outline

update (WOUS64 KWNS WOU1).



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.



&&



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

2.5 inches. Extreme turbulence and surface wind gusts to 65 knots. A

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

27025.



...Thompson






160 

WWUS20 KWNS 131955

SEL2  

SPC WW 131955

COZ000-NEZ000-SDZ000-WYZ000-140400-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 412

NWS Storm Prediction Center Norman OK

200 PM MDT Fri Jun 13 2025



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of 

  Northeast Colorado

  Western Nebraska

  Extreme southwest South Dakota

  Eastern Wyoming



* Effective this Friday afternoon and evening from 200 PM until

  1000 PM MDT.



* Primary threats include...

  Scattered damaging winds likely with isolated significant gusts

    to 75 mph possible

  Scattered large hail and isolated very large hail events to 2

    inches in diameter possible



SUMMARY...Thunderstorms are expected to form and spread east of the

higher terrain, with the potential for clustering/upscale growth by

this evening.  Large hail will be possible with the initial, more

cellular storms (especially across northeast Wyoming where a

supercell or two will be possible).  However, severe outflow gusts

of 60-75 mph will become the main threat later this evening as storm

clusters spread east-southeastward over the High Plains.



The severe thunderstorm watch area is approximately along and 60

statute miles east and west of a line from 50 miles north northwest

of Gillette WY to 15 miles southeast of Akron CO. 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 411...



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

2 inches. Extreme turbulence and surface wind gusts to 65 knots. A

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

28020.



...Thompson