Alert archive / Nebraska / Severe Thunderstorm Watches in 2015
Severe Thunderstorm Watch 507
The Storm Prediction Center issued this severe thunderstorm watch at Sep 7, 2015, 6:50 PM CDT for 8 counties in Kansas; 13 counties in Nebraska. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Sep 7, 2015, 6:50 PM CDT (23:50 UTC)
- Expired
- Sep 7, 2015, 9:04 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 65 kt
All 21 counties
Cheyenne County, KS, Decatur County, KS, Graham County, KS, Norton County, KS, Rawlins County, KS, Sheridan County, KS, Sherman County, KS, Thomas County, KS, Chase County, NE, Custer County, NE, Dawson County, NE, Dundy County, NE, Frontier County, NE, Furnas County, NE, Gosper County, NE, Hayes County, NE, Hitchcock County, NE, Keith County, NE, Lincoln County, NE, Perkins County, NE, Red Willow County, NE
The radar
The Goodland radar (KGLD), 146 km from the middle of the area, began a volume at 23:52 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
- 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
- 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
- 60%
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 11.8 hours before the alert went out and 74 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1107 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 111 m²/s²
- 0-3 km storm-relative helicity
- 187 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 7, 2:18 PM CDT | Mesoscale Discussion | SPC | Brown, Cloud, Jewell, Marshall, Mitchell, Nemaha and 2 more | 87 min |
| Sep 7, 3:37 PM CDT | Severe Thunderstorm Watch | SPC | Anderson, Brown, Clay, Cloud, Coffey, Dickinson and 17 more | 6 hr |
| Sep 7, 5:46 PM CDT | Mesoscale Discussion | SPC | Cheyenne | 119 min |
| Sep 7, 6:23 PM CDT | Mesoscale Discussion | SPC | Chase, Clay, Cloud, Dickinson, Ellsworth, Geary and 18 more | 97 min |
| Sep 7, 6:38 PM CDT | Severe Thunderstorm Watch | SPC | Allen, Butler, Chase, Greenwood, Marion, Woodson | 3 hr |
| Sep 6, 8:42 PM CDT | Mesoscale Discussion | SPC | Cass, Douglas, Gage, Johnson, Lancaster, Nemaha and 4 more | 93 min |
| Sep 6, 11:41 PM CDT | Mesoscale Discussion | SPC | Cass, Gage, Johnson, Lancaster, Nemaha, Otoe and 2 more | 64 min |
Nearby
Severe Thunderstorm Watches in Nebraska, 2015Severe Thunderstorm Watches in Kansas, 2015Every 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.