Alert archive / Nebraska / Severe Thunderstorm Watches in 2007
Severe Thunderstorm Watch 474
The Storm Prediction Center issued this severe thunderstorm watch at Jul 2, 2007, 4:33 PM MDT for 9 counties in Nebraska; 8 counties in South Dakota. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 2, 2007, 4:33 PM MDT (22:33 UTC)
- Expired
- Jul 2, 2007, 10:07 PM MDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
Counties Banner County, NE, Box Butte County, NE, Cheyenne County, NE, Dawes County, NE, Kimball County, NE, Morrill County, NE, Scotts Bluff County, NE, Sheridan County, NE, Sioux County, NE, Butte County, SD, Custer County, SD, Fall River County, SD, Harding County, SD, Lawrence County, SD, Meade County, SD, Pennington County, SD, Perkins County, SD
The radar
The Rapid City radar (KUDX), 37 km from the middle of the area, began a volume at 22:35 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
- 5%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 40%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
12 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 2, 4:37 PM MDT | Severe Thunderstorm Warning | UNR | Lawrence | 38 min |
| Jul 2, 4:41 PM MDT | Severe Thunderstorm Warning | CYS | Dawes | 64 min |
| Jul 2, 5:14 PM MDT | Severe Thunderstorm Warning | UNR | Pennington | 61 min |
| Jul 2, 5:15 PM MDT | Severe Thunderstorm Warning | CYS | Dawes | 60 min |
| Jul 2, 5:38 PM MDT | Severe Thunderstorm Warning | CYS | Box Butte, Sioux | 67 min |
| Jul 2, 5:40 PM MDT | Severe Thunderstorm Warning | UNR | Pennington | 36 min |
| Jul 2, 5:46 PM MDT | Severe Thunderstorm Warning | LBF | Cherry, Sheridan | 59 min |
| Jul 2, 6:05 PM MDT | Flash Flood Warning | CYS | Box Butte, Dawes, Sioux | 115 min |
| Jul 2, 6:21 PM MDT | Severe Thunderstorm Warning | LBF | Cherry, Sheridan | 54 min |
| Jul 2, 6:42 PM MDT | Severe Thunderstorm Warning | CYS | Box Butte | 63 min |
| Jul 2, 6:54 PM MDT | Severe Thunderstorm Warning | UNR | 38 min | |
| Jul 2, 7:40 PM MDT | Severe Thunderstorm Warning | CYS | Box Butte, Morrill | 65 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, 10.6 hours before the alert went out and 31 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
- 266 J/kg
- Mixed-layer CIN
- -419 J/kg
- Mixed-layer LCL
- 2424 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- -50 m²/s²
- 0-3 km storm-relative helicity
- 153 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 |
|---|---|---|---|---|
| Jul 1, 6:23 PM MDT | Mesoscale Discussion | SPC | Campbell, Corson, Edmunds, McPherson, Perkins, Walworth | 67 min |
| Jul 1, 8:38 PM MDT | Mesoscale Discussion | SPC | Corson, Harding, Perkins | 67 min |
| Jul 2, 4:59 PM MDT | Mesoscale Discussion | SPC | Beadle, Brookings, Brown, Buffalo, Campbell, Clark and 24 more | 91 min |
Nearby
Severe Thunderstorm Watches in Nebraska, 2007Severe Thunderstorm Watches in South Dakota, 2007Every severe thunderstorm watch in 2007
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.