Alert archive / South Dakota / Tornado Watches in 2013

Tornado Watch 217

May 25, 20134 states

The Storm Prediction Center issued this tornado watch at May 25, 2013, 1:52 PM MDT for 4 states. It was in force for 8 hr.

The area

The outline as issued.

The facts

Issued: May 25, 2013, 1:52 PM MDT (19:52 UTC)
Expired: May 25, 2013, 10:00 PM MDT
In force: 8 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2.5 in
Strongest gust expected: 60 kt

All 41 counties

Carter County, MT, Custer County, MT, Dawson County, MT, Fallon County, MT, Powder River County, MT, Prairie County, MT, Rosebud County, MT, Wibaux County, MT, Adams County, ND, Billings County, ND, Bowman County, ND, Burleigh County, ND, Emmons County, ND, Golden Valley County, ND, Grant County, ND, Hettinger County, ND, Morton County, ND, Sioux County, ND, Slope County, ND, Stark County, ND, Bennett County, SD, Butte County, SD, Corson County, SD, Custer County, SD, Dewey County, SD, Fall River County, SD, Haakon County, SD, Harding County, SD, Jackson County, SD, Jones County, SD, Lawrence County, SD, Meade County, SD, Mellette County, SD, Pennington County, SD, Perkins County, SD, Stanley County, SD, Todd County, SD, Ziebach County, SD, Campbell County, WY, Crook County, WY, Weston County, WY

The radar

The Rapid City radar (KUDX), 76 km from the middle of the area, began a volume at 19:53 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: 40%
One or more EF2 to EF5 tornadoes: 20%
Ten or more severe wind reports: 40%
One or more gusts of 65 knots or more: 10%
Ten or more severe hail reports: 70%
One or more hailstones of 2 inches or more: 50%
Six or more combined severe hail and wind reports: 80%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
May 25, 1:57 PM MDT	Severe Thunderstorm Warning	UNR	Perkins	63 min
May 25, 2:32 PM MDT	Severe Thunderstorm Warning	UNR	Butte, Meade	58 min
May 25, 2:34 PM MDT	Severe Thunderstorm Warning	BIS	Adams, Bowman	41 min
May 25, 2:55 PM MDT	Severe Thunderstorm Warning	BIS	Adams	20 min
May 25, 3:03 PM MDT	Severe Thunderstorm Warning	BYZ	Carter	27 min
May 25, 3:03 PM MDT	Severe Thunderstorm Warning	GGW	Dawson	57 min
May 25, 3:04 PM MDT	Severe Thunderstorm Warning	UNR	Perkins	56 min
May 25, 3:12 PM MDT	Severe Thunderstorm Warning	BIS	Adams	48 min
May 25, 3:17 PM MDT	Severe Thunderstorm Warning	UNR	Harding	58 min
May 25, 3:22 PM MDT	Severe Thunderstorm Warning	BYZ	Carter	38 min
May 25, 3:25 PM MDT	Severe Thunderstorm Warning	UNR	Butte, Meade	65 min
May 25, 3:30 PM MDT	Severe Thunderstorm Warning	BYZ	Carter	60 min
May 25, 3:42 PM MDT	Severe Thunderstorm Warning	UNR	Harding, Perkins	63 min
May 25, 4:00 PM MDT	Severe Thunderstorm Warning	BIS	Adams	45 min
May 25, 4:07 PM MDT	Tornado Warning	BYZ	Carter	23 min
May 25, 4:13 PM MDT	Severe Thunderstorm Warning	UNR	Harding	62 min
May 25, 4:28 PM MDT	Severe Thunderstorm Warning	UNR	Butte, Meade	62 min
May 25, 4:29 PM MDT	Tornado Warning	BYZ	Carter	31 min
May 25, 4:31 PM MDT	Severe Thunderstorm Warning	UNR	Campbell, Crook	44 min
May 25, 4:32 PM MDT	Severe Thunderstorm Warning	BIS	Grant	43 min
May 25, 4:36 PM MDT	Severe Thunderstorm Warning	UNR	Weston	39 min
May 25, 4:44 PM MDT	Severe Thunderstorm Warning	BIS	Adams, Grant, Sioux	46 min
May 25, 4:46 PM MDT	Severe Thunderstorm Warning	UNR	Perkins	59 min
May 25, 4:52 PM MDT	Severe Thunderstorm Warning	UNR	Meade	53 min
May 25, 5:00 PM MDT	Tornado Warning	BYZ	Carter	30 min
May 25, 5:05 PM MDT	Severe Thunderstorm Warning	UNR	Harding	55 min
May 25, 5:08 PM MDT	Severe Thunderstorm Warning	BYZ	Carter, Powder River	67 min
May 25, 5:15 PM MDT	Severe Thunderstorm Warning	ABR	Corson	45 min
May 25, 5:16 PM MDT	Severe Thunderstorm Warning	BIS	Grant, Morton	44 min
May 25, 5:38 PM MDT	Severe Thunderstorm Warning	BYZ	Custer, Rosebud	52 min
May 25, 5:38 PM MDT	Severe Thunderstorm Warning	UNR	Harding	97 min
May 25, 5:43 PM MDT	Severe Thunderstorm Warning	UNR	Meade	62 min
May 25, 5:44 PM MDT	Severe Thunderstorm Warning	BIS	Adams, Grant, Sioux	46 min
May 25, 5:45 PM MDT	Severe Thunderstorm Warning	UNR	Perkins	60 min
May 25, 6:00 PM MDT	Severe Thunderstorm Warning	ABR	Corson	30 min
May 25, 6:03 PM MDT	Severe Thunderstorm Warning	UNR	Harding	72 min
May 25, 6:13 PM MDT	Severe Thunderstorm Warning	BYZ	Carter, Powder River	47 min
May 25, 6:26 PM MDT	Severe Thunderstorm Warning	BYZ	Custer, Rosebud	64 min
May 25, 6:27 PM MDT	Severe Thunderstorm Warning	UNR	Meade, Pennington	63 min
May 25, 6:29 PM MDT	Severe Thunderstorm Warning	UNR	Harding	76 min
May 25, 6:30 PM MDT	Severe Thunderstorm Warning	ABR	Corson	45 min
May 25, 6:32 PM MDT	Severe Thunderstorm Warning	BIS	Grant, Sioux	43 min
May 25, 6:45 PM MDT	Severe Thunderstorm Warning	BIS	Morton	30 min
May 25, 6:46 PM MDT	Tornado Warning	BYZ	Carter	29 min
May 25, 7:03 PM MDT	Severe Thunderstorm Warning	BIS	Grant, Sioux	42 min
May 25, 7:09 PM MDT	Severe Thunderstorm Warning	BIS	Grant, Sioux	51 min
May 25, 7:10 PM MDT	Severe Thunderstorm Warning	UNR	Perkins	65 min
May 25, 7:12 PM MDT	Severe Thunderstorm Warning	GGW	Dawson, Garfield, McCone, Richland, Roosevelt, Valley	63 min
May 25, 7:13 PM MDT	Severe Thunderstorm Warning	BYZ	Rosebud	62 min
May 25, 7:13 PM MDT	Tornado Warning	BYZ	Carter	32 min
May 25, 7:15 PM MDT	Severe Thunderstorm Warning	BIS	Burleigh, Morton	30 min
May 25, 7:18 PM MDT	Severe Thunderstorm Warning	UNR	Butte, Harding	72 min
May 25, 7:19 PM MDT	Severe Thunderstorm Warning	ABR	Corson	56 min
May 25, 7:20 PM MDT	Severe Thunderstorm Warning	UNR	Harding, Perkins	85 min
May 25, 7:25 PM MDT	Severe Thunderstorm Warning	UNR	Meade, Pennington	65 min
May 25, 7:26 PM MDT	Severe Thunderstorm Warning	GGW	Dawson, Garfield, McCone, Prairie	64 min
May 25, 7:28 PM MDT	Severe Thunderstorm Warning	BYZ	Custer, Rosebud	62 min
May 25, 7:47 PM MDT	Severe Thunderstorm Warning	BYZ	Rosebud	43 min
May 25, 7:52 PM MDT	Severe Thunderstorm Warning	ABR	Corson	38 min
May 25, 7:52 PM MDT	Severe Thunderstorm Warning	UNR	Harding	83 min
May 25, 8:02 PM MDT	Severe Thunderstorm Warning	GGW	Dawson, Garfield, McCone, Prairie, Richland	58 min
May 25, 8:15 PM MDT	Severe Thunderstorm Warning	UNR	Harding	60 min
May 25, 8:16 PM MDT	Flash Flood Warning	BIS	Sioux	6 hr
May 25, 8:27 PM MDT	Severe Thunderstorm Warning	ABR	Corson	48 min
May 25, 8:28 PM MDT	Severe Thunderstorm Warning	BYZ	Custer, Powder River, Rosebud	62 min
May 25, 8:29 PM MDT	Severe Thunderstorm Warning	ABR	Corson	46 min
May 25, 8:33 PM MDT	Severe Thunderstorm Warning	BIS	Sioux	57 min
May 25, 8:44 PM MDT	Severe Thunderstorm Warning	UNR	Haakon, Ziebach	61 min
May 25, 9:16 PM MDT	Severe Thunderstorm Warning	ABR	Corson, Dewey	44 min
May 25, 9:36 PM MDT	Severe Thunderstorm Warning	UNR	Harding	69 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 (KUNR), launched 12:00Z, 7.9 hours before the alert went out and 78 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: 1101 J/kg
Mixed-layer CIN: -140 J/kg
Mixed-layer LCL: 1140 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 95 m²/s²
0-3 km storm-relative helicity: 14 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 25, 11:43 AM MDT	Mesoscale Discussion	SPC	Carter, Custer, Dawson, Fallon, McCone, Powder River and 4 more	92 min
May 25, 2:27 PM MDT	Mesoscale Discussion	SPC	Goshen, Laramie, Platte	93 min

Nearby

Tornado Watches in South Dakota, 2013 Tornado Watches in North Dakota, 2013 Tornado Watches in Montana, 2013 Every tornado watch in 2013

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.