Alert archive / Nebraska / Severe Thunderstorm Watches in 2002
Severe Thunderstorm Watch 590
The Storm Prediction Center issued this severe thunderstorm watch at Aug 11, 2002, 2:35 PM MDT for 15 counties in Nebraska; 5 counties in South Dakota. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 11, 2002, 2:35 PM MDT (20:35 UTC)
- Expired
- Aug 11, 2002, 8:00 PM MDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
Counties Arthur County, NE, Blaine County, NE, Brown County, NE, Cherry County, NE, Custer County, NE, Grant County, NE, Hooker County, NE, Keith County, NE, Keya Paha County, NE, Lincoln County, NE, Logan County, NE, Loup County, NE, McPherson County, NE, Rock County, NE, Thomas County, NE, Bennett County, SD, Jackson County, SD, Mellette County, SD, Todd County, SD, Tripp County, SD
The radar
The North Platte radar (KLNX), 33 km from the middle of the area, began a volume at 20:38 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.
Warnings issued inside it
11 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 11, 3:26 PM MDT | Severe Thunderstorm Warning | LBF | Blaine, Thomas | 49 min |
| Aug 11, 4:36 PM MDT | Severe Thunderstorm Warning | LBF | Thomas | 39 min |
| Aug 11, 5:16 PM MDT | Tornado Warning | LBF | Thomas | 29 min |
| Aug 11, 5:46 PM MDT | Severe Thunderstorm Warning | LBF | Blaine, Thomas | 44 min |
| Aug 11, 5:49 PM MDT | Severe Thunderstorm Warning | LBF | Loup | 56 min |
| Aug 11, 6:23 PM MDT | Tornado Warning | LBF | Blaine | 37 min |
| Aug 11, 6:44 PM MDT | Severe Thunderstorm Warning | LBF | Custer | 61 min |
| Aug 11, 6:46 PM MDT | Severe Thunderstorm Warning | UNR | Tripp | 59 min |
| Aug 11, 7:01 PM MDT | Tornado Warning | LBF | Blaine | 29 min |
| Aug 11, 7:33 PM MDT | Severe Thunderstorm Warning | LBF | Blaine | 27 min |
| Aug 11, 7:47 PM MDT | Severe Thunderstorm Warning | LBF | Custer | 58 min |
The nearest sounding before it
N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 8.6 hours before the alert went out and 113 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
- 1947 J/kg
- Mixed-layer CIN
- -210 J/kg
- Mixed-layer LCL
- 1660 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 50 m²/s²
- 0-3 km storm-relative helicity
- 68 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 |
|---|---|---|---|---|
| Aug 11, 5:00 PM MDT | Severe Thunderstorm Watch | SPC | Dawson, Frontier, Furnas, Gosper, Hayes, Hitchcock and 1 more | 5 hr |
| Aug 11, 12:55 PM MDT | Severe Thunderstorm Watch | SPC | Beadle, Brown, Buffalo, Campbell, Clark, Day and 17 more | 5 hr |
Nearby
Severe Thunderstorm Watches in Nebraska, 2002Severe Thunderstorm Watches in South Dakota, 2002Every severe thunderstorm watch in 2002
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.