Alert archive / Nebraska / Severe Thunderstorm Watches in 2012

Severe Thunderstorm Watch 419

June 22, 20124 states

The Storm Prediction Center issued this severe thunderstorm watch at Jun 22, 2012, 3:52 PM MDT for 4 states. It was in force for 9 hr.

The area

The outline as issued.

The facts

Issued: Jun 22, 2012, 3:52 PM MDT (21:52 UTC)
Expired: Jun 23, 2012, 1:00 AM MDT
In force: 9 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2.5 in
Strongest gust expected: 60 kt

All 39 counties

Logan County, CO, Morgan County, CO, Phillips County, CO, Sedgwick County, CO, Washington County, CO, Yuma County, CO, Cheyenne County, KS, Decatur County, KS, Rawlins County, KS, Arthur County, NE, Banner County, NE, Box Butte County, NE, Chase County, NE, Cherry County, NE, Cheyenne County, NE, Dawes County, NE, Deuel County, NE, Dundy County, NE, Frontier County, NE, Garden County, NE, Grant County, NE, Hayes County, NE, Hitchcock County, NE, Hooker County, NE, Keith County, NE, Kimball County, NE, Lincoln County, NE, Logan County, NE, McPherson County, NE, Morrill County, NE, Perkins County, NE, Red Willow County, NE, Scotts Bluff County, NE, Sheridan County, NE, Sioux County, NE, Thomas County, NE, Goshen County, WY, Niobrara County, WY, Platte County, WY

The radar

The Cheyenne radar (KCYS), 124 km from the middle of the area, began a volume at 21:52 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: 30%
One or more hailstones of 2 inches or more: 50%
Six or more combined severe hail and wind reports: 70%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Jun 22, 4:55 PM MDT	Severe Thunderstorm Warning	BOU	Logan, Weld	27 min
Jun 22, 5:07 PM MDT	Severe Thunderstorm Warning	CYS	Cheyenne, Kimball	38 min
Jun 22, 6:33 PM MDT	Severe Thunderstorm Warning	CYS	Niobrara	42 min
Jun 22, 6:52 PM MDT	Flash Flood Warning	CYS	Niobrara	2 hr
Jun 22, 7:06 PM MDT	Severe Thunderstorm Warning	BOU	Logan, Phillips	24 min
Jun 22, 7:25 PM MDT	Severe Thunderstorm Warning	GLD	Yuma	50 min
Jun 22, 7:28 PM MDT	Severe Thunderstorm Warning	BOU	Logan, Phillips	47 min
Jun 22, 7:37 PM MDT	Severe Thunderstorm Warning	LBF	Keith, Perkins	55 min
Jun 22, 7:42 PM MDT	Severe Thunderstorm Warning	LBF	Deuel, Garden	63 min
Jun 22, 8:08 PM MDT	Severe Thunderstorm Warning	GLD	Yuma	52 min
Jun 22, 8:10 PM MDT	Tornado Warning	CYS	Dawes, Sioux	35 min
Jun 22, 8:12 PM MDT	Severe Thunderstorm Warning	LBF	Arthur, Garden, Keith	24 min
Jun 22, 8:17 PM MDT	Tornado Warning	GLD	Yuma	7 min
Jun 22, 8:23 PM MDT	Tornado Warning	GLD	Yuma	16 min
Jun 22, 8:43 PM MDT	Severe Thunderstorm Warning	GLD	Yuma	62 min
Jun 22, 8:45 PM MDT	Severe Thunderstorm Warning	LBF	Deuel, Keith	45 min
Jun 22, 8:49 PM MDT	Severe Thunderstorm Warning	CYS	Dawes	28 min
Jun 22, 9:08 PM MDT	Severe Thunderstorm Warning	LBF	Lincoln	52 min
Jun 22, 9:27 PM MDT	Severe Thunderstorm Warning	LBF	Keith	48 min
Jun 22, 9:38 PM MDT	Severe Thunderstorm Warning	GLD	Dundy	52 min
Jun 22, 10:13 PM MDT	Severe Thunderstorm Warning	GLD	Dundy, Hitchcock	47 min
Jun 22, 10:49 PM MDT	Severe Thunderstorm Warning	GLD	Hitchcock	30 min
Jun 22, 11:14 PM MDT	Severe Thunderstorm Warning	LBF	Custer, Lincoln, Logan	32 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

Denver, CO (KDNR), launched 12:00Z, 9.9 hours before the alert went out and 200 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: 3114 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 55 m²/s²
0-3 km storm-relative helicity: 51 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 22, 2:59 PM MDT	Mesoscale Discussion	SPC	Logan, Morgan, Phillips, Sedgwick, Washington, Weld and 1 more	91 min
Jun 22, 5:02 PM MDT	Mesoscale Discussion	SPC	Campbell, Crook, Weston	118 min
Jun 22, 5:48 PM MDT	Severe Thunderstorm Watch	SPC	Crook, Weston	7 hr

Nearby

Severe Thunderstorm Watches in Nebraska, 2012 Severe Thunderstorm Watches in Colorado, 2012 Severe Thunderstorm Watches in Kansas, 2012 Every severe thunderstorm watch in 2012

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.