Alert archive / Wyoming / Severe Thunderstorm Watches in 2011

Severe Thunderstorm Watch 547

June 24, 20115 states

The Storm Prediction Center issued this severe thunderstorm watch at Jun 24, 2011, 1:52 PM MDT for 5 states. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued: Jun 24, 2011, 1:52 PM MDT (19:52 UTC)
Expired: Jun 24, 2011, 9:00 PM MDT
In force: 7 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2 in
Strongest gust expected: 60 kt

All 46 counties

Larimer County, CO, Logan County, CO, Morgan County, CO, Phillips County, CO, Sedgwick County, CO, Washington County, CO, Weld County, CO, Big Horn County, MT, Carter County, MT, Custer County, MT, Fallon County, MT, Powder River County, MT, Rosebud County, MT, Treasure County, MT, Banner County, NE, Box Butte County, NE, Cheyenne County, NE, Dawes County, NE, Kimball County, NE, Morrill County, NE, Scotts Bluff County, NE, Sioux County, NE, Butte County, SD, Custer County, SD, Fall River County, SD, Harding County, SD, Lawrence County, SD, Meade County, SD, Pennington County, SD, Perkins County, SD, Albany County, WY, Big Horn County, WY, Campbell County, WY, Converse County, WY, Crook County, WY, Fremont County, WY, Goshen County, WY, Hot Springs County, WY, Johnson County, WY, Laramie County, WY, Natrona County, WY, Niobrara County, WY, Platte County, WY, Sheridan County, WY, Washakie County, WY, Weston County, WY

The radar

The Cheyenne radar (KCYS), 176 km from the middle of the area, began a volume at 19:52 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: 50%
One or more hailstones of 2 inches or more: 50%
Six or more combined severe hail and wind reports: 80%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Jun 24, 1:53 PM MDT	Severe Thunderstorm Warning	CYS	Albany, Laramie, Platte	52 min
Jun 24, 2:12 PM MDT	Severe Thunderstorm Warning	CYS	Converse	48 min
Jun 24, 2:19 PM MDT	Flash Flood Warning	RIW	Big Horn	3 hr
Jun 24, 2:28 PM MDT	Severe Thunderstorm Warning	CYS	Albany, Converse	47 min
Jun 24, 3:07 PM MDT	Severe Thunderstorm Warning	BYZ	Sheridan	53 min
Jun 24, 3:12 PM MDT	Severe Thunderstorm Warning	RIW	Fremont	48 min
Jun 24, 3:14 PM MDT	Severe Thunderstorm Warning	RIW	Johnson	61 min
Jun 24, 3:19 PM MDT	Severe Thunderstorm Warning	CYS	Converse, Goshen, Platte	56 min
Jun 24, 3:24 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Platte	53 min
Jun 24, 3:26 PM MDT	Severe Thunderstorm Warning	UNR	Lawrence, Meade	64 min
Jun 24, 3:35 PM MDT	Severe Thunderstorm Warning	UNR	Campbell, Crook	70 min
Jun 24, 3:46 PM MDT	Severe Thunderstorm Warning	CYS	Niobrara	59 min
Jun 24, 3:52 PM MDT	Severe Thunderstorm Warning	RIW	Fremont, Natrona	38 min
Jun 24, 4:05 PM MDT	Severe Thunderstorm Warning	UNR	Butte, Meade	43 min
Jun 24, 4:12 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Niobrara, Platte	29 min
Jun 24, 4:21 PM MDT	Severe Thunderstorm Warning	UNR	Meade, Pennington	54 min
Jun 24, 4:29 PM MDT	Severe Thunderstorm Warning	CYS	Sioux	46 min
Jun 24, 4:31 PM MDT	Severe Thunderstorm Warning	RIW	Natrona	44 min
Jun 24, 4:38 PM MDT	Severe Thunderstorm Warning	RIW	Natrona	37 min
Jun 24, 4:42 PM MDT	Severe Thunderstorm Warning	UNR	Campbell, Crook	93 min
Jun 24, 4:43 PM MDT	Severe Thunderstorm Warning	UNR	Meade	21 min
Jun 24, 5:02 PM MDT	Severe Thunderstorm Warning	RIW	Natrona	43 min
Jun 24, 5:13 PM MDT	Severe Thunderstorm Warning	CYS	Dawes	49 min
Jun 24, 5:37 PM MDT	Severe Thunderstorm Warning	UNR	Butte, Lawrence, Meade	53 min
Jun 24, 6:05 PM MDT	Severe Thunderstorm Warning	CYS	Banner, Cheyenne, Kimball, Morrill	34 min
Jun 24, 6:19 PM MDT	Severe Thunderstorm Warning	UNR	Lawrence, Meade, Pennington	56 min
Jun 24, 6:30 PM MDT	Severe Thunderstorm Warning	UNR	Butte, Lawrence, Meade	60 min
Jun 24, 6:43 PM MDT	Severe Thunderstorm Warning	UNR	Custer, Pennington	32 min
Jun 24, 6:54 PM MDT	Severe Thunderstorm Warning	UNR	Butte, Harding, Meade, Perkins, Ziebach	96 min
Jun 24, 7:11 PM MDT	Severe Thunderstorm Warning	UNR	Custer, Fall River, Meade, Pennington	64 min
Jun 24, 7:32 PM MDT	Severe Thunderstorm Warning	UNR	Haakon, Jackson, Meade, Pennington, Ziebach	88 min
Jun 24, 8:05 PM MDT	Severe Thunderstorm Warning	UNR	Custer, Jackson, Pennington	24 min
Jun 24, 8:19 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte, Morrill, Scotts Bluff, Sioux	22 min
Jun 24, 8:56 PM MDT	Severe Thunderstorm Warning	CYS	Banner, Kimball	15 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 24, 1:25 PM MDT	Mesoscale Discussion	SPC	Big Horn, Powder River	65 min
Jun 24, 4:57 PM MDT	Mesoscale Discussion	SPC	Arthur, Blaine, Boyd, Brown, Cherry, Custer and 16 more	2 hr
Jun 24, 5:46 PM MDT	Severe Thunderstorm Watch	SPC	Arthur, Blaine, Brown, Cherry, Custer, Garden and 11 more	6 hr

Nearby

Severe Thunderstorm Watches in Wyoming, 2011 Severe Thunderstorm Watches in South Dakota, 2011 Severe Thunderstorm Watches in Nebraska, 2011 Every severe thunderstorm watch in 2011

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.