Alert archive / Nebraska / Severe Thunderstorm Watches in 2011

Severe Thunderstorm Watch 484

June 16, 20114 states

The Storm Prediction Center issued this severe thunderstorm watch at Jun 16, 2011, 1:55 PM MDT for 4 states. It was in force for 9 hr.

The area

The outline as issued.

The facts

Issued: Jun 16, 2011, 1:55 PM MDT (19:55 UTC)
Expired: Jun 16, 2011, 11:00 PM MDT
In force: 9 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2 in
Strongest gust expected: 60 kt

All 47 counties

Elbert County, CO, Larimer County, CO, Lincoln County, CO, Logan County, CO, Morgan County, CO, Phillips County, CO, Sedgwick County, CO, Washington County, CO, Weld County, CO, Arthur County, NE, Banner County, NE, Blaine County, NE, Box Butte County, NE, Brown County, NE, Chase County, NE, Cherry County, NE, Cheyenne County, NE, Custer County, NE, Dawes County, NE, Deuel County, NE, Frontier County, NE, Garden County, NE, Grant County, NE, Hayes County, NE, Hooker County, NE, Keith County, NE, Keya Paha County, NE, Kimball County, NE, Lincoln County, NE, Logan County, NE, Loup County, NE, McPherson County, NE, Morrill County, NE, Perkins County, NE, Rock County, NE, Scotts Bluff County, NE, Sheridan County, NE, Sioux County, NE, Thomas County, NE, Bennett County, SD, Jackson County, SD, Mellette County, SD, Todd County, SD, Tripp County, SD, Goshen County, WY, Laramie County, WY, Platte County, WY

The radar

The Cheyenne radar (KCYS), 165 km from the middle of the area, began a volume at 19:58 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: 30%
One or more hailstones of 2 inches or more: 30%
Six or more combined severe hail and wind reports: 80%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Jun 16, 1:59 PM MDT	Severe Thunderstorm Warning	CYS	Laramie, Platte	46 min
Jun 16, 2:28 PM MDT	Severe Thunderstorm Warning	CYS	Sioux	23 min
Jun 16, 2:36 PM MDT	Severe Thunderstorm Warning	CYS	Scotts Bluff	24 min
Jun 16, 2:51 PM MDT	Severe Thunderstorm Warning	CYS	Banner, Scotts Bluff	54 min
Jun 16, 2:55 PM MDT	Severe Thunderstorm Warning	CYS	Scotts Bluff, Sioux	43 min
Jun 16, 3:23 PM MDT	Flash Flood Warning	CYS	Banner, Scotts Bluff, Sioux	12 hr
Jun 16, 3:36 PM MDT	Severe Thunderstorm Warning	CYS	Banner, Box Butte, Morrill, Scotts Bluff, Sioux	39 min
Jun 16, 4:03 PM MDT	Severe Thunderstorm Warning	LBF	Cherry	42 min
Jun 16, 4:09 PM MDT	Severe Thunderstorm Warning	CYS	Banner, Box Butte, Morrill, Scotts Bluff, Sioux	51 min
Jun 16, 4:19 PM MDT	Flash Flood Warning	CYS	Banner, Box Butte, Dawes, Morrill, Scotts Bluff, Sioux	6 hr
Jun 16, 4:38 PM MDT	Severe Thunderstorm Warning	UNR	Bennett, Todd	82 min
Jun 16, 4:43 PM MDT	Severe Thunderstorm Warning	LBF	Cherry	32 min
Jun 16, 4:53 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte, Dawes, Morrill	37 min
Jun 16, 4:59 PM MDT	Severe Thunderstorm Warning	LBF	Cherry, Garden, Sheridan	61 min
Jun 16, 5:01 PM MDT	Severe Thunderstorm Warning	LBF	Cherry	44 min
Jun 16, 5:01 PM MDT	Severe Thunderstorm Warning	UNR	Mellette, Todd	59 min
Jun 16, 5:03 PM MDT	Severe Thunderstorm Warning	BOU	Arapahoe, Elbert, Lincoln, Washington	23 min
Jun 16, 5:19 PM MDT	Tornado Warning	LBF	Cherry	26 min
Jun 16, 5:24 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Arapahoe, Elbert, Lincoln, Morgan, Washington	66 min
Jun 16, 5:29 PM MDT	Severe Thunderstorm Warning	LBF	Garden, Grant, Sheridan	46 min
Jun 16, 5:42 PM MDT	Tornado Warning	LBF	Cherry	33 min
Jun 16, 5:43 PM MDT	Severe Thunderstorm Warning	BOU	Jackson, Larimer	47 min
Jun 16, 5:45 PM MDT	Severe Thunderstorm Warning	LBF	Cherry, Sheridan	45 min
Jun 16, 5:53 PM MDT	Severe Thunderstorm Warning	UNR	Todd	67 min
Jun 16, 5:55 PM MDT	Severe Thunderstorm Warning	CYS	Banner, Cheyenne, Kimball	50 min
Jun 16, 6:03 PM MDT	Severe Thunderstorm Warning	BOU	Logan	27 min
Jun 16, 6:08 PM MDT	Severe Thunderstorm Warning	LBF	Arthur, Grant	52 min
Jun 16, 6:09 PM MDT	Flash Flood Warning	LBF	Cherry	5 hr
Jun 16, 6:15 PM MDT	Severe Thunderstorm Warning	LBF	Cherry	45 min
Jun 16, 6:25 PM MDT	Flash Flood Warning	UNR	Todd	3 hr
Jun 16, 6:27 PM MDT	Severe Thunderstorm Warning	CYS	Albany, Laramie	48 min
Jun 16, 6:29 PM MDT	Severe Thunderstorm Warning	UNR	Todd	61 min
Jun 16, 6:38 PM MDT	Flash Flood Warning	CYS	Banner, Cheyenne, Kimball	6 hr
Jun 16, 6:50 PM MDT	Severe Thunderstorm Warning	LBF	Cherry	40 min
Jun 16, 6:55 PM MDT	Severe Thunderstorm Warning	LBF	Arthur, Grant, Hooker, McPherson	50 min
Jun 16, 7:03 PM MDT	Severe Thunderstorm Warning	LBF	Deuel, Garden	42 min
Jun 16, 7:09 PM MDT	Severe Thunderstorm Warning	UNR	Todd	66 min
Jun 16, 7:29 PM MDT	Severe Thunderstorm Warning	BOU	Arapahoe, Elbert	31 min
Jun 16, 7:30 PM MDT	Severe Thunderstorm Warning	LBF	Cherry, Hooker, Thomas	60 min
Jun 16, 7:35 PM MDT	Severe Thunderstorm Warning	BOU	Larimer, Weld	40 min
Jun 16, 7:42 PM MDT	Severe Thunderstorm Warning	LBF	Deuel, Garden, Keith, Perkins	48 min
Jun 16, 7:54 PM MDT	Severe Thunderstorm Warning	LBF	Blaine, Brown, Cherry, Keya Paha, Thomas	51 min
Jun 16, 8:04 PM MDT	Severe Thunderstorm Warning	UNR	Todd, Tripp	71 min
Jun 16, 8:07 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Weld	23 min
Jun 16, 8:26 PM MDT	Severe Thunderstorm Warning	LBF	Keith, Lincoln, Perkins	64 min
Jun 16, 8:26 PM MDT	Severe Thunderstorm Warning	LBF	Blaine, Brown, Cherry, Keya Paha, Loup, Rock and 1 more	66 min
Jun 16, 8:47 PM MDT	Severe Thunderstorm Warning	LBF	Lincoln	43 min
Jun 16, 9:10 PM MDT	Severe Thunderstorm Warning	LBF	Frontier, Hayes, Lincoln	65 min
Jun 16, 9:44 PM MDT	Severe Thunderstorm Warning	LBF	Custer	46 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 228 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: 2064 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: -23 m²/s²
0-3 km storm-relative helicity: -12 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 16, 12:37 PM MDT	Mesoscale Discussion	SPC	Jackson, Moffat, Rio Blanco, Routt	113 min
Jun 16, 1:34 PM MDT	Mesoscale Discussion	SPC	Weld	56 min
Jun 16, 4:49 PM MDT	Mesoscale Discussion	SPC	Logan, Morgan, Phillips, Sedgwick, Washington, Weld	86 min
Jun 16, 5:18 PM MDT	Mesoscale Discussion	SPC	Kit Carson, Yuma	87 min
Jun 16, 5:34 PM MDT	Severe Thunderstorm Watch	SPC	Cheyenne, Kit Carson, Yuma	7 hr

Nearby

Severe Thunderstorm Watches in Nebraska, 2011 Severe Thunderstorm Watches in Colorado, 2011 Severe Thunderstorm Watches in South Dakota, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.