Severe Thunderstorm Watch 250

Issued

Jun 9, 2021, 6:42 PM MDT (00:42 UTC)

Expired

Jun 10, 2021, 12:00 AM MDT

In force

5 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

60 kt

Counties Blaine County, MT, Chouteau County, MT, Fergus County, MT, Hill County, MT, Judith Basin County, MT, Petroleum County, MT, Phillips County, MT

The Glasgow radar (KGGW), 174 km from the middle of the area, began a volume at 00:41 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

2%

Ten or more severe wind reports

30%

One or more gusts of 65 knots or more

20%

Ten or more severe hail reports

30%

One or more hailstones of 2 inches or more

30%

Six or more combined severe hail and wind reports

60%

• Mesoscale Discussion 903 Severe potential...watch possibleJun 9, 5:05 PM MDT
• Mesoscale Discussion 904 Severe thunderstorm watch 250Jun 9, 8:34 PM MDT
• Mesoscale Discussion 905 Severe thunderstorm watch 250Jun 9, 10:51 PM MDT

166 
WWUS20 KWNS 100039
SEL0  
SPC WW 100039
MTZ000-100600-

URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 250
NWS Storm Prediction Center Norman OK
640 PM MDT Wed Jun 9 2021

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of 
  central Montana

* Effective this Wednesday night from 640 PM until Midnight MDT.

* Primary threats include...
  Isolated very large hail events to 2 inches in diameter possible
  Isolated damaging wind gusts to 70 mph possible
  A tornado or two possible

SUMMARY...Isolated storms including supercells will pose a risk for
mainly large to very large hail and downburst winds this evening. A
brief tornado or two also cannot be ruled out.

The severe thunderstorm watch area is approximately along and 75
statute miles east and west of a line from 50 miles northeast of
Havre MT to 20 miles southwest of Lewistown MT. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU0).

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 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 500. Mean storm motion vector
24035.

...Dial

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.