Alert archive / South Dakota / Severe Thunderstorm Watches in 2001
Severe Thunderstorm Watch 647
The Storm Prediction Center issued this severe thunderstorm watch at Jul 31, 2001, 5:30 PM CDT for 17 counties in Nebraska; 26 counties in South Dakota. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 31, 2001, 5:30 PM CDT (22:30 UTC)
- Expired
- Aug 1, 2001, 12:00 AM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
All 43 counties
Antelope County, NE, Blaine County, NE, Boone County, NE, Boyd County, NE, Brown County, NE, Custer County, NE, Garfield County, NE, Greeley County, NE, Holt County, NE, Howard County, NE, Keya Paha County, NE, Knox County, NE, Loup County, NE, Rock County, NE, Sherman County, NE, Valley County, NE, Wheeler County, NE, Aurora County, SD, Beadle County, SD, Bon Homme County, SD, Brown County, SD, Brule County, SD, Buffalo County, SD, Charles Mix County, SD, Clark County, SD, Codington County, SD, Davison County, SD, Day County, SD, Douglas County, SD, Faulk County, SD, Gregory County, SD, Hamlin County, SD, Hand County, SD, Hanson County, SD, Hutchinson County, SD, Jerauld County, SD, Kingsbury County, SD, Marshall County, SD, McCook County, SD, Miner County, SD, Roberts County, SD, Sanborn County, SD, Spink County, SD
The radar
The North Platte radar (KLNX), 174 km from the middle of the area, began a volume at 22:29 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
15 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 31, 6:25 PM CDT | Severe Thunderstorm Warning | LBF | Brown | 35 min |
| Jul 31, 6:39 PM CDT | Severe Thunderstorm Warning | LBF | Custer | 66 min |
| Jul 31, 6:46 PM CDT | Severe Thunderstorm Warning | LBF | Brown | 44 min |
| Jul 31, 6:52 PM CDT | Severe Thunderstorm Warning | FSD | Gregory | 23 min |
| Jul 31, 6:56 PM CDT | Severe Thunderstorm Warning | LBF | Keya Paha, Rock | 34 min |
| Jul 31, 7:30 PM CDT | Severe Thunderstorm Warning | LBF | Brown, Rock | 60 min |
| Jul 31, 7:49 PM CDT | Severe Thunderstorm Warning | LBF | Boyd, Holt | 56 min |
| Jul 31, 8:06 PM CDT | Severe Thunderstorm Warning | GID | Sherman, Valley | 54 min |
| Jul 31, 8:10 PM CDT | Severe Thunderstorm Warning | LBF | Custer | 35 min |
| Jul 31, 8:44 PM CDT | Severe Thunderstorm Warning | LBF | Boyd, Holt | 61 min |
| Jul 31, 8:54 PM CDT | Severe Thunderstorm Warning | FSD | Charles Mix | 36 min |
| Jul 31, 9:23 PM CDT | Severe Thunderstorm Warning | OAX | Knox | 37 min |
| Jul 31, 9:29 PM CDT | Severe Thunderstorm Warning | FSD | Bon Homme, Charles Mix | 31 min |
| Jul 31, 9:38 PM CDT | Severe Thunderstorm Warning | FSD | Bon Homme | 22 min |
| Jul 31, 9:58 PM CDT | Severe Thunderstorm Warning | FSD | Bon Homme | 32 min |
The nearest sounding before it
Aberdeen, SD (KABR), launched 12:00Z, 10.5 hours before the alert went out and 218 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
- 4366 J/kg
- Mixed-layer CIN
- -133 J/kg
- Mixed-layer LCL
- 1039 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 21 m²/s²
- 0-3 km storm-relative helicity
- 10 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 0.8
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 30, 8:00 PM CDT | Severe Thunderstorm Watch | SPC | Butte, Corson, Custer, Dewey, Haakon, Harding and 7 more | 5 hr |
| Jul 30, 11:45 PM CDT | Severe Thunderstorm Watch | SPC | Brown, Campbell, Edmunds, Faulk, Hughes, Hyde and 7 more | 5 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.