Alert archive / Wyoming / Severe Thunderstorm Watches in 2014

Severe Thunderstorm Watch 220

June 4, 20144 states

The Storm Prediction Center issued this severe thunderstorm watch at Jun 4, 2014, 1:44 PM MDT for 4 states. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: Jun 4, 2014, 1:44 PM MDT (19:44 UTC)
Expired: Jun 4, 2014, 7:21 PM MDT
In force: 6 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2 in
Strongest gust expected: 60 kt

All 23 counties

Carter County, MT, Custer County, MT, Fallon County, MT, Powder River County, MT, Bowman County, ND, Slope County, ND, Butte County, SD, Custer County, SD, Fall River County, SD, Harding County, SD, Lawrence County, SD, Meade County, SD, Pennington County, SD, Albany County, WY, Campbell County, WY, Converse County, WY, Crook County, WY, Goshen County, WY, Laramie County, WY, Niobrara County, WY, Platte County, WY, Sheridan County, WY, Weston County, WY

The radar

The Rapid City radar (KUDX), 178 km from the middle of the area, began a volume at 19:44 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: 10%
One or more EF2 to EF5 tornadoes: 2%
Ten or more severe wind reports: 30%
One or more gusts of 65 knots or more: 10%
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%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Jun 4, 2:22 PM MDT	Severe Thunderstorm Warning	BYZ	Big Horn, Powder River, Rosebud	53 min
Jun 4, 2:27 PM MDT	Severe Thunderstorm Warning	BYZ	Carter	63 min
Jun 4, 2:35 PM MDT	Severe Thunderstorm Warning	UNR	Campbell	23 min
Jun 4, 2:46 PM MDT	Severe Thunderstorm Warning	UNR	Campbell	59 min
Jun 4, 2:55 PM MDT	Severe Thunderstorm Warning	BYZ	Powder River	35 min
Jun 4, 2:56 PM MDT	Severe Thunderstorm Warning	BYZ	Carter	23 min
Jun 4, 3:10 PM MDT	Severe Thunderstorm Warning	BYZ	Carter	50 min
Jun 4, 3:14 PM MDT	Severe Thunderstorm Warning	UNR	Harding	38 min
Jun 4, 3:21 PM MDT	Severe Thunderstorm Warning	UNR	Butte	54 min
Jun 4, 3:29 PM MDT	Severe Thunderstorm Warning	BYZ	Carter, Powder River	31 min
Jun 4, 3:39 PM MDT	Severe Thunderstorm Warning	CYS	Goshen	22 min
Jun 4, 3:39 PM MDT	Severe Thunderstorm Warning	UNR	Campbell, Crook	66 min
Jun 4, 3:59 PM MDT	Severe Thunderstorm Warning	BYZ	Carter, Powder River	46 min
Jun 4, 4:11 PM MDT	Severe Thunderstorm Warning	UNR	Butte	79 min
Jun 4, 4:15 PM MDT	Severe Thunderstorm Warning	UNR	Custer, Pennington	30 min
Jun 4, 4:16 PM MDT	Severe Thunderstorm Warning	CYS	Niobrara	44 min
Jun 4, 4:35 PM MDT	Severe Thunderstorm Warning	UNR	Campbell	28 min
Jun 4, 4:39 PM MDT	Severe Thunderstorm Warning	UNR	Crook	36 min
Jun 4, 4:41 PM MDT	Severe Thunderstorm Warning	UNR	Fall River	64 min
Jun 4, 4:59 PM MDT	Severe Thunderstorm Warning	UNR	Butte, Lawrence, Meade	61 min
Jun 4, 5:25 PM MDT	Severe Thunderstorm Warning	UNR	Custer, Fall River	65 min
Jun 4, 5:33 PM MDT	Tornado Warning	UNR	Fall River	27 min
Jun 4, 5:51 PM MDT	Severe Thunderstorm Warning	UNR	Butte, Meade, Perkins	54 min
Jun 4, 6:30 PM MDT	Severe Thunderstorm Warning	UNR	Haakon, Meade, Pennington, Ziebach	46 min
Jun 4, 6:34 PM MDT	Severe Thunderstorm Warning	UNR	Haakon, Jackson, Pennington	40 min

Discussions around it

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

Mesoscale Discussion 816Jun 4, 12:58 PM MDT

The nearest sounding before it

Rapid City, SD (KRAP), launched 12:00Z, 7.7 hours before the alert went out and 175 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 67 J/kg
Mixed-layer CIN: -269 J/kg
Mixed-layer LCL: 950 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: -38 m²/s²
0-3 km storm-relative helicity: 2 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 3, 8:32 PM MDT	Mesoscale Discussion	SPC	Custer, Powder River, Prairie, Rosebud	58 min
Jun 4, 12:58 PM MDT	Mesoscale Discussion	SPC	Carter, Custer, Fallon, Powder River, Rosebud	92 min
Jun 3, 6:04 PM MDT	Mesoscale Discussion	SPC	Adams, Blaine, Boone, Buffalo, Butler, Cass and 34 more	56 min
Jun 3, 8:41 PM MDT	Mesoscale Discussion	SPC	Adams, Boone, Buffalo, Butler, Cass, Clay and 34 more	64 min
Jun 3, 11:28 PM MDT	Mesoscale Discussion	SPC	Gage, Jefferson, Johnson, Nemaha, Otoe, Pawnee and 2 more	62 min
Jun 3, 11:50 PM MDT	Severe Thunderstorm Watch	SPC	Gage, Jefferson, Johnson, Lancaster, Nemaha, Otoe and 3 more	3 hr
Jun 4, 4:41 PM MDT	Mesoscale Discussion	SPC	Arthur, Banner, Box Butte, Chase, Cheyenne, Dawes and 15 more	64 min
Jun 4, 5:12 PM MDT	Severe Thunderstorm Watch	SPC	Arthur, Banner, Box Butte, Chase, Cherry, Cheyenne and 14 more	8 hr
Jun 4, 5:40 PM MDT	Mesoscale Discussion	SPC	Benson, Bottineau, Burleigh, Eddy, Foster, McHenry and 11 more	95 min

Nearby

Severe Thunderstorm Watches in Wyoming, 2014 Severe Thunderstorm Watches in South Dakota, 2014 Severe Thunderstorm Watches in Montana, 2014 Every severe thunderstorm watch in 2014

Sources

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.