Severe Thunderstorm Watch 252

Issued

Jun 10, 2021, 2:52 PM MDT (20:52 UTC)

Expired

Jun 10, 2021, 8:55 PM MDT

In force

6 hr

Issued by

the Storm Prediction Center

Largest hail expected

3 in

Strongest gust expected

60 kt

Counties Blaine County, MT, Custer County, MT, Dawson County, MT, Fergus County, MT, Garfield County, MT, Golden Valley County, MT, McCone County, MT, Musselshell County, MT, Petroleum County, MT, Phillips County, MT, Prairie County, MT, Rosebud County, MT, Valley County, MT

The Glasgow radar (KGGW), 68 km from the middle of the area, began a volume at 20:56 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

Two or more tornadoes

20%

One or more EF2 to EF5 tornadoes

5%

Ten or more severe wind reports

40%

One or more gusts of 65 knots or more

10%

Ten or more severe hail reports

50%

One or more hailstones of 2 inches or more

30%

Six or more combined severe hail and wind reports

80%

• Mesoscale Discussion 907 Severe potential...watch possibleJun 10, 1:47 PM MDT
• Mesoscale Discussion 908 Severe potential...tornado watch likelyJun 10, 1:56 PM MDT
• Mesoscale Discussion 911 Severe thunderstorm watch 252Jun 10, 4:48 PM MDT

179 
WWUS20 KWNS 102049
SEL2  
SPC WW 102049
MTZ000-110400-

URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 252
NWS Storm Prediction Center Norman OK
250 PM MDT Thu Jun 10 2021

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of 
  East-Central/Northeast Montana

* Effective this Thursday afternoon and evening from 250 PM until
  1000 PM MDT.

* Primary threats include...
  Scattered large hail and isolated very large hail events to 3
    inches in diameter possible
  Scattered damaging wind gusts to 70 mph possible
  A tornado or two possible

SUMMARY...Scattered severe thunderstorms including some supercells
are expected to develop initially across east-central Montana and
quickly move north-northeastward through evening. Large hail and
severe-caliber wind gusts are the primary hazards, although a
tornado could also occur.

The severe thunderstorm watch area is approximately along and 90
statute miles east and west of a line from 75 miles east northeast
of Havre MT to 55 miles west southwest of Miles City MT. 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 251...

AVIATION...A few severe thunderstorms with hail surface and aloft to
3 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 500. Mean storm motion vector
22035.

...Guyer

Severe Thunderstorm Watches in Montana, 2021Every severe thunderstorm watch in 2021

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.