Alert archive / South Dakota / Severe Thunderstorm Watches in 2014

Severe Thunderstorm Watch 358

June 26, 20144 states

The Storm Prediction Center issued this severe thunderstorm watch at Jun 26, 2014, 3:01 PM MDT for 4 states. It was in force for 8 hr.

The area

The outline as issued.

The facts

Issued: Jun 26, 2014, 3:01 PM MDT (21:01 UTC)
Expired: Jun 26, 2014, 11:00 PM MDT
In force: 8 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2.5 in
Strongest gust expected: 60 kt

All 27 counties

Logan County, CO, Morgan County, CO, Phillips County, CO, Sedgwick County, CO, Washington County, CO, Weld County, CO, 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, Converse County, WY, Goshen County, WY, Laramie County, WY, Niobrara County, WY, Platte County, WY

The radar

The Cheyenne radar (KCYS), 161 km from the middle of the area, began a volume at 21:04 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: 40%
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

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

Issued	Product	Office	Counties	Lasted
Jun 26, 3:22 PM MDT	Severe Thunderstorm Warning	CYS	Platte	53 min
Jun 26, 5:21 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Morgan	24 min
Jun 26, 5:31 PM MDT	Severe Thunderstorm Warning	CYS	Scotts Bluff	37 min
Jun 26, 5:38 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	67 min
Jun 26, 5:46 PM MDT	Severe Thunderstorm Warning	CYS	Niobrara	44 min
Jun 26, 5:55 PM MDT	Severe Thunderstorm Warning	BOU	Weld	35 min
Jun 26, 5:56 PM MDT	Severe Thunderstorm Warning	UNR	Custer, Pennington	64 min
Jun 26, 6:33 PM MDT	Severe Thunderstorm Warning	BOU	Weld	27 min
Jun 26, 6:45 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	42 min
Jun 26, 7:08 PM MDT	Severe Thunderstorm Warning	BOU	Logan, Washington	37 min
Jun 26, 7:13 PM MDT	Severe Thunderstorm Warning	UNR	Butte	39 min
Jun 26, 7:38 PM MDT	Severe Thunderstorm Warning	CYS	Kimball	67 min
Jun 26, 7:47 PM MDT	Severe Thunderstorm Warning	BOU	Logan, Phillips, Washington	58 min
Jun 26, 8:14 PM MDT	Severe Thunderstorm Warning	CYS	Banner, Cheyenne, Kimball, Morrill	61 min
Jun 26, 8:46 PM MDT	Severe Thunderstorm Warning	BOU	Washington	44 min
Jun 26, 8:53 PM MDT	Flash Flood Warning	CYS	Banner, Kimball	6 hr
Jun 26, 8:55 PM MDT	Severe Thunderstorm Warning	CYS	Cheyenne, Kimball, Morrill	65 min
Jun 26, 9:13 PM MDT	Severe Thunderstorm Warning	UNR	Meade, Pennington	62 min
Jun 26, 9:49 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte, Dawes	56 min

Discussions around it

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

The nearest sounding before it

Rapid City, SD (KRAP), launched 12:00Z, 9.0 hours before the alert went out and 199 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1771 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 71 m²/s²
0-3 km storm-relative helicity: 138 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 25, 8:49 PM MDT	Mesoscale Discussion	SPC	Cheyenne, Kiowa, Kit Carson, Prowers	56 min
Jun 26, 2:07 PM MDT	Mesoscale Discussion	SPC	Adams, Arapahoe, Boulder, Broomfield, Cheyenne, Denver and 15 more	53 min
Jun 26, 5:48 PM MDT	Mesoscale Discussion	SPC	Adams, Logan, Morgan, Washington, Weld, Yuma	87 min
Jun 26, 5:50 PM MDT	Mesoscale Discussion	SPC	Baca, Bent, Crowley, Kiowa, Otero, Prowers	2 hr
Jun 26, 12:35 PM MDT	Mesoscale Discussion	SPC	Big Horn, Carter, Custer, Daniels, Dawson, Fallon and 13 more	115 min
Jun 26, 1:33 PM MDT	Severe Thunderstorm Watch	SPC	Big Horn, Carter, Custer, Dawson, Fallon, Garfield and 13 more	7 hr
Jun 26, 5:15 PM MDT	Mesoscale Discussion	SPC	Big Horn, Carbon, Carter, Custer, Dawson, Fallon and 14 more	90 min
Jun 25, 8:15 PM MDT	Mesoscale Discussion	SPC	Garden, Sheridan	90 min
Jun 26, 1:54 PM MDT	Mesoscale Discussion	SPC	Burt, Butler, Cass, Colfax, Cuming, Dakota and 24 more	3 hr

Nearby

Severe Thunderstorm Watches in South Dakota, 2014 Severe Thunderstorm Watches in Nebraska, 2014 Severe Thunderstorm Watches in Colorado, 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.