Alert archive / South Dakota / Severe Thunderstorm Watches in 2001
Severe Thunderstorm Watch 637
The Storm Prediction Center issued this severe thunderstorm watch at Jul 28, 2001, 8:45 PM CDT for 5 counties in Nebraska; 13 counties in South Dakota. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 28, 2001, 8:45 PM CDT (01:45 UTC)
- Expired
- Jul 29, 2001, 1:00 AM CDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
Counties Boyd County, NE, Brown County, NE, Cherry County, NE, Keya Paha County, NE, Rock County, NE, Aurora County, SD, Brule County, SD, Buffalo County, SD, Charles Mix County, SD, Davison County, SD, Douglas County, SD, Gregory County, SD, Jerauld County, SD, Lyman County, SD, Miner County, SD, Sanborn County, SD, Todd County, SD, Tripp County, SD
The radar
The North Platte radar (KLNX), 115 km from the middle of the area, began a volume at 01:47 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
8 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 28, 8:52 PM CDT | Severe Thunderstorm Warning | UNR | Tripp | 53 min |
| Jul 28, 9:36 PM CDT | Severe Thunderstorm Warning | UNR | Todd | 39 min |
| Jul 28, 9:38 PM CDT | Severe Thunderstorm Warning | FSD | Brule | 37 min |
| Jul 28, 9:40 PM CDT | Severe Thunderstorm Warning | UNR | Tripp | 50 min |
| Jul 28, 9:45 PM CDT | Severe Thunderstorm Warning | LBF | Cherry, Keya Paha | 45 min |
| Jul 28, 9:49 PM CDT | Severe Thunderstorm Warning | ABR | Buffalo | 26 min |
| Jul 28, 10:29 PM CDT | Severe Thunderstorm Warning | LBF | Keya Paha | 61 min |
| Jul 28, 10:50 PM CDT | Severe Thunderstorm Warning | LBF | Brown | 40 min |
The nearest sounding before it
N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 1.8 hours before the alert went out and 205 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
- 1283 J/kg
- Mixed-layer CIN
- -63 J/kg
- Mixed-layer LCL
- 2023 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- -5 m²/s²
- 0-3 km storm-relative helicity
- 154 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 29, 6:15 PM CDT | Severe Thunderstorm Watch | SPC | Arthur, Blaine, Brown, Custer, Deuel, Garfield and 10 more | 6 hr |
Nearby
Severe Thunderstorm Watches in South Dakota, 2001Severe Thunderstorm Watches in Nebraska, 2001Every severe thunderstorm watch in 2001
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.