Alert archive / Nebraska / Severe Thunderstorm Watches in 2015

Severe Thunderstorm Watch 478

August 7, 201520 counties in Colorado; 13 counties in Kansas; 23 counties in Nebraska

The Storm Prediction Center issued this severe thunderstorm watch at Aug 7, 2015, 3:05 PM MDT for 20 counties in Colorado; 13 counties in Kansas; 23 counties in Nebraska. It was in force for 8 hr.

The area

The outline as issued.

The facts

Issued: Aug 7, 2015, 3:05 PM MDT (21:05 UTC)
Expired: Aug 7, 2015, 10:47 PM MDT
In force: 8 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2 in
Strongest gust expected: 60 kt

All 56 counties

Adams County, CO, Arapahoe County, CO, Bent County, CO, Cheyenne County, CO, Crowley County, CO, El Paso County, CO, Elbert County, CO, Kiowa County, CO, Kit Carson County, CO, Lincoln County, CO, Logan County, CO, Morgan County, CO, Otero County, CO, Phillips County, CO, Prowers County, CO, Pueblo County, CO, Sedgwick County, CO, Washington County, CO, Weld County, CO, Yuma County, CO, Cheyenne County, KS, Decatur County, KS, Gove County, KS, Graham County, KS, Greeley County, KS, Logan County, KS, Norton County, KS, Rawlins County, KS, Sheridan County, KS, Sherman County, KS, Thomas County, KS, Wallace County, KS, Wichita County, KS, Arthur County, NE, Banner County, NE, Chase County, NE, Cherry County, NE, Cheyenne 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, Sheridan County, NE, Thomas County, NE

The radar

The Goodland radar (KGLD), 177 km from the middle of the area, began a volume at 21:10 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: 10%
Ten or more severe wind reports: 40%
One or more gusts of 65 knots or more: 20%
Ten or more severe hail reports: 40%
One or more hailstones of 2 inches or more: 30%
Six or more combined severe hail and wind reports: 60%

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
Aug 7, 3:16 PM MDT	Severe Thunderstorm Warning	PUB	Bent, Otero	29 min
Aug 7, 3:42 PM MDT	Severe Thunderstorm Warning	BOU	Morgan, Weld	33 min
Aug 7, 3:46 PM MDT	Severe Thunderstorm Warning	PUB	Baca, Bent, Las Animas, Otero, Prowers	39 min
Aug 7, 3:51 PM MDT	Severe Thunderstorm Warning	PUB	Crowley, Otero	35 min
Aug 7, 4:05 PM MDT	Severe Thunderstorm Warning	BOU	Douglas, Elbert	25 min
Aug 7, 4:21 PM MDT	Tornado Warning	BOU	Morgan	24 min
Aug 7, 4:28 PM MDT	Severe Thunderstorm Warning	BOU	Elbert	32 min
Aug 7, 4:36 PM MDT	Severe Thunderstorm Warning	LBF	Deuel, Garden	39 min
Aug 7, 4:39 PM MDT	Severe Thunderstorm Warning	BOU	Morgan	51 min
Aug 7, 5:14 PM MDT	Tornado Warning	BOU	Morgan	31 min
Aug 7, 5:33 PM MDT	Severe Thunderstorm Warning	BOU	Logan, Morgan	42 min
Aug 7, 5:35 PM MDT	Flash Flood Warning	CYS	Cheyenne, Kimball	3 hr
Aug 7, 5:44 PM MDT	Severe Thunderstorm Warning	BOU	Morgan	31 min
Aug 7, 5:50 PM MDT	Tornado Warning	BOU	Adams, Arapahoe, Washington	40 min
Aug 7, 5:55 PM MDT	Severe Thunderstorm Warning	BOU	Washington	50 min
Aug 7, 6:14 PM MDT	Severe Thunderstorm Warning	BOU	Morgan	31 min
Aug 7, 6:19 PM MDT	Severe Thunderstorm Warning	GLD	Logan, Wichita	56 min
Aug 7, 6:33 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Arapahoe, Washington	42 min
Aug 7, 6:33 PM MDT	Tornado Warning	BOU	Washington	27 min
Aug 7, 6:36 PM MDT	Severe Thunderstorm Warning	GLD	Logan, Wallace, Wichita	39 min
Aug 7, 6:49 PM MDT	Tornado Warning	BOU	Morgan, Washington	26 min
Aug 7, 6:49 PM MDT	Severe Thunderstorm Warning	GLD	Yuma	56 min
Aug 7, 6:51 PM MDT	Severe Thunderstorm Warning	GLD	Gove, Logan, Sheridan, Sherman, Thomas	54 min
Aug 7, 6:51 PM MDT	Severe Thunderstorm Warning	LBF	Chase, Perkins	24 min
Aug 7, 6:54 PM MDT	Tornado Warning	BOU	Washington	25 min
Aug 7, 7:00 PM MDT	Severe Thunderstorm Warning	LBF	Chase	30 min
Aug 7, 7:03 PM MDT	Tornado Warning	GLD	Yuma	27 min
Aug 7, 7:12 PM MDT	Severe Thunderstorm Warning	LBF	Perkins	33 min
Aug 7, 7:20 PM MDT	Severe Thunderstorm Warning	GLD	Cheyenne, Rawlins, Sherman, Thomas	55 min
Aug 7, 7:22 PM MDT	Severe Thunderstorm Warning	BOU	Washington	38 min
Aug 7, 7:22 PM MDT	Severe Thunderstorm Warning	LBF	Chase	38 min
Aug 7, 7:25 PM MDT	Severe Thunderstorm Warning	BOU	Phillips	50 min
Aug 7, 7:29 PM MDT	Tornado Warning	GLD	Dundy	31 min
Aug 7, 7:32 PM MDT	Tornado Warning	LBF	Chase	28 min
Aug 7, 7:33 PM MDT	Severe Thunderstorm Warning	GLD	Yuma	57 min
Aug 7, 7:33 PM MDT	Severe Thunderstorm Warning	GLD	Cheyenne, Decatur, Gove, Logan, Rawlins, Sheridan and 1 more	57 min
Aug 7, 7:39 PM MDT	Flash Flood Warning	LBF	Chase	5 hr
Aug 7, 7:49 PM MDT	Severe Thunderstorm Warning	LBF	Chase, Perkins	41 min
Aug 7, 7:58 PM MDT	Severe Thunderstorm Warning	LBF	Chase	47 min
Aug 7, 8:00 PM MDT	Severe Thunderstorm Warning	GLD	Dundy	60 min
Aug 7, 8:04 PM MDT	Severe Thunderstorm Warning	GLD	Cheyenne, Decatur, Rawlins	56 min
Aug 7, 8:09 PM MDT	Severe Thunderstorm Warning	GLD	Decatur, Gove, Graham, Norton, Rawlins, Sheridan	66 min
Aug 7, 8:16 PM MDT	Severe Thunderstorm Warning	GLD	Cheyenne	59 min
Aug 7, 8:26 PM MDT	Severe Thunderstorm Warning	LBF	Chase, Hayes	49 min
Aug 7, 8:47 PM MDT	Flash Flood Warning	GLD	Hitchcock	6 hr
Aug 7, 8:52 PM MDT	Severe Thunderstorm Warning	GLD	Cheyenne, Decatur, Norton, Rawlins	53 min
Aug 7, 8:55 PM MDT	Flash Flood Warning	LBF	Chase, Hayes	5 hr
Aug 7, 9:04 PM MDT	Severe Thunderstorm Warning	GLD	Decatur, Gove, Graham, Norton, Sheridan	56 min
Aug 7, 9:30 PM MDT	Severe Thunderstorm Warning	GLD	Dundy	14 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 (KDEN), launched 12:00Z, 9.1 hours before the alert went out and 112 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: 3310 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 43 m²/s²
0-3 km storm-relative helicity: 43 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
Aug 7, 2:12 PM MDT	Mesoscale Discussion	SPC	Adams, Arapahoe, Bent, Broomfield, Cheyenne, Crowley and 17 more	3 hr

Nearby

Severe Thunderstorm Watches in Nebraska, 2015 Severe Thunderstorm Watches in Colorado, 2015 Severe Thunderstorm Watches in Kansas, 2015 Every severe thunderstorm watch in 2015

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.