Alert archive / South Dakota / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 67, NWS Aberdeen, SD
NWS Aberdeen, SD issued this severe thunderstorm warning at Jul 20, 1987, 5:14 PM CDT for Clark County, South Dakota. It was in force for 61 min.
The area
The counties it named.
The facts
- Issued
- Jul 20, 1987, 5:14 PM CDT (22:14 UTC)
- Expired
- Jul 20, 1987, 6:15 PM CDT
- In force
- 61 min
- Issued by
- NWS Aberdeen, SD
- Area
- Whole counties
County Clark County, SD
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
The nearest sounding before it
Minneapolis, MN (KSTC), launched 12:00Z, 10.2 hours before the alert went out and 325 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
- 4599 J/kg
- Mixed-layer CIN
- -25 J/kg
- Mixed-layer LCL
- 604 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 134 m²/s²
- 0-3 km storm-relative helicity
- 192 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 15.7
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
In the hours before
Special weather statement, Jul 20, 2:10 PM CDT, 3 hours 4 minutes before
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</html>The office that day
Everything else NWS Aberdeen, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 19, 9:33 PM CDT | Tornado Warning | ABR | Corson | 27 min |
| Jul 19, 10:54 PM CDT | Tornado Warning | ABR | Corson | 36 min |
| Jul 19, 11:01 PM CDT | Severe Thunderstorm Warning | ABR | Brown, Day, Spink | 59 min |
| Jul 19, 11:13 PM CDT | Tornado Warning | ABR | Corson | 32 min |
| Jul 19, 11:58 PM CDT | Tornado Warning | ABR | Corson | 32 min |
| Jul 20, 12:28 AM CDT | Severe Thunderstorm Warning | ABR | Brown | 62 min |
| Jul 20, 12:37 AM CDT | Tornado Warning | ABR | Corson | 38 min |
| Jul 20, 12:52 AM CDT | Severe Thunderstorm Warning | ABR | Spink | 38 min |
| Jul 20, 1:08 AM CDT | Severe Thunderstorm Warning | ABR | Campbell | 67 min |
| Jul 20, 1:21 AM CDT | Severe Thunderstorm Warning | ABR | Jones | 34 min |
| Jul 20, 1:21 AM CDT | Severe Thunderstorm Warning | ABR | Hughes, Lyman, Stanley | 69 min |
| Jul 20, 1:35 AM CDT | Severe Thunderstorm Warning | ABR | Brown, McPherson | 55 min |
| Jul 20, 2:31 AM CDT | Severe Thunderstorm Warning | ABR | Brown | 59 min |
| Jul 20, 3:03 AM CDT | Severe Thunderstorm Warning | ABR | Day, Marshall | 57 min |
| Jul 20, 7:52 AM CDT | Severe Thunderstorm Warning | ABR | Marshall, Roberts | 48 min |
Nearby
Severe Thunderstorm Warnings in South Dakota, 1987Every severe thunderstorm warning in 1987
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.