Alert archive / South Dakota / Tornado Watches in 1999
Tornado Watch 425
The Storm Prediction Center issued this tornado watch at Jun 8, 1999, 6:45 PM MDT for 26 counties in South Dakota. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 8, 1999, 6:45 PM MDT (00:45 UTC)
- Expired
- Jun 9, 1999, 1:00 AM MDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
All 26 counties
Bennett County, SD, Campbell County, SD, Corson County, SD, Dewey County, SD, Edmunds County, SD, Fall River County, SD, Faulk County, SD, Haakon County, SD, Hughes County, SD, Hyde County, SD, Jackson County, SD, Jones County, SD, Lyman County, SD, McPherson County, SD, Meade County, SD, Mellette County, SD, Oglala Lakota County, SD, Pennington County, SD, Perkins County, SD, Potter County, SD, Stanley County, SD, Sully County, SD, Todd County, SD, Tripp County, SD, Walworth County, SD, Ziebach County, SD
The radar
The Rapid City radar (KUDX), 88 km from the middle of the area, began a volume at 00:48 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
9 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 8, 6:51 PM MDT | Severe Thunderstorm Warning | UNR | Mellette | 49 min |
| Jun 8, 6:54 PM MDT | Tornado Warning | ABR | Corson | 66 min |
| Jun 8, 6:55 PM MDT | Severe Thunderstorm Warning | UNR | Todd | 35 min |
| Jun 8, 7:21 PM MDT | Severe Thunderstorm Warning | UNR | Meade | 49 min |
| Jun 8, 8:05 PM MDT | Severe Thunderstorm Warning | UNR | Tripp | 35 min |
| Jun 8, 8:33 PM MDT | Tornado Warning | ABR | Corson | 32 min |
| Jun 8, 9:24 PM MDT | Severe Thunderstorm Warning | UNR | Haakon | 61 min |
| Jun 8, 10:25 PM MDT | Severe Thunderstorm Warning | UNR | Haakon | 60 min |
| Jun 9, 12:00 AM MDT | Severe Thunderstorm Warning | UNR | Meade | 65 min |
The nearest sounding before it
Aberdeen, SD (KABR), launched 00:00Z, 0.8 hours before the alert went out and 278 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
- 3880 J/kg
- Mixed-layer CIN
- -21 J/kg
- Mixed-layer LCL
- 1393 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 59 m²/s²
- 0-3 km storm-relative helicity
- 184 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 |
|---|---|---|---|---|
| Jun 8, 10:00 PM MDT | Severe Thunderstorm Watch | SPC | Aurora, Beadle, Bon Homme, Brookings, Brown, Brule and 31 more | 6 hr |
| Jun 9, 1:00 PM MDT | Severe Thunderstorm Watch | SPC | Brookings, Clay, Codington, Deuel, Grant, Hamlin and 6 more | 6 hr |
Nearby
Tornado Watches in South Dakota, 1999Every tornado watch in 1999
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.