Alert archive / Montana / Severe Thunderstorm Watches in 2012

Severe Thunderstorm Watch 363

June 8, 201216 counties in Montana

The Storm Prediction Center issued this severe thunderstorm watch at Jun 8, 2012, 5:41 PM MDT for 16 counties in Montana. It was in force for 9 hr.

The area

The outline as issued.

The facts

Issued: Jun 8, 2012, 5:41 PM MDT (23:41 UTC)
Expired: Jun 9, 2012, 3:00 AM MDT
In force: 9 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2 in
Strongest gust expected: 60 kt

Counties Custer County, MT, Daniels County, MT, Dawson County, MT, Fallon County, MT, Garfield County, MT, McCone County, MT, Musselshell County, MT, Petroleum County, MT, Phillips County, MT, Prairie County, MT, Richland County, MT, Roosevelt County, MT, Rosebud County, MT, Sheridan County, MT, Valley County, MT, Wibaux County, MT

The radar

The Glasgow radar (KGGW), 25 km from the middle of the area, began a volume at 23:41 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.

What SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes: 20%
One or more EF2 to EF5 tornadoes: 5%
Ten or more severe wind reports: 30%
One or more gusts of 65 knots or more: 30%
Ten or more severe hail reports: 40%
One or more hailstones of 2 inches or more: 40%
Six or more combined severe hail and wind reports: 80%

Warnings issued inside it

20 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

Issued	Product	Office	Counties	Lasted
Jun 8, 6:00 PM MDT	Severe Thunderstorm Warning	GGW	Phillips	60 min
Jun 8, 7:30 PM MDT	Severe Thunderstorm Warning	GGW	Valley	29 min
Jun 8, 8:40 PM MDT	Severe Thunderstorm Warning	GGW	Garfield, Valley	35 min
Jun 8, 9:13 PM MDT	Severe Thunderstorm Warning	GGW	Garfield, McCone, Valley	47 min
Jun 8, 9:54 PM MDT	Severe Thunderstorm Warning	GGW	McCone, Valley	36 min
Jun 8, 10:34 PM MDT	Severe Thunderstorm Warning	GGW	Garfield	26 min
Jun 8, 10:37 PM MDT	Severe Thunderstorm Warning	GGW	McCone, Valley	23 min
Jun 8, 10:40 PM MDT	Severe Thunderstorm Warning	BYZ	Rosebud	65 min
Jun 8, 10:47 PM MDT	Severe Thunderstorm Warning	GGW	Garfield	43 min
Jun 8, 10:55 PM MDT	Severe Thunderstorm Warning	GGW	Garfield, Valley	50 min
Jun 8, 10:59 PM MDT	Severe Thunderstorm Warning	GGW	Valley	46 min
Jun 8, 11:13 PM MDT	Severe Thunderstorm Warning	GGW	Garfield, McCone, Prairie	47 min
Jun 8, 11:17 PM MDT	Severe Thunderstorm Warning	BYZ	Big Horn, Rosebud, Treasure	58 min
Jun 8, 11:36 PM MDT	Severe Thunderstorm Warning	BYZ	Rosebud, Treasure	33 min
Jun 8, 11:57 PM MDT	Severe Thunderstorm Warning	GGW	Garfield, McCone, Prairie	48 min
Jun 9, 12:30 AM MDT	Severe Thunderstorm Warning	GGW	Dawson, Garfield, McCone, Prairie	60 min
Jun 9, 1:11 AM MDT	Severe Thunderstorm Warning	GGW	Dawson, McCone, Richland, Roosevelt	64 min
Jun 9, 1:43 AM MDT	Flash Flood Warning	GGW	McCone, Richland, Roosevelt, Valley	113 min
Jun 9, 1:58 AM MDT	Severe Thunderstorm Warning	GGW	Roosevelt, Sheridan	62 min
Jun 9, 2:09 AM MDT	Severe Thunderstorm Warning	GGW	Richland, Roosevelt	51 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 8, 2:52 PM MDT	Mesoscale Discussion	SPC	Blaine, Daniels, Fergus, Garfield, McCone, Musselshell and 3 more	53 min
Jun 8, 5:07 PM MDT	Mesoscale Discussion	SPC	Custer, Daniels, Dawson, Garfield, McCone, Petroleum and 6 more	53 min

Nearby

Severe Thunderstorm Watches in Montana, 2012 Every severe thunderstorm watch in 2012

Sources

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