Alert archive / Minnesota / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 118, NWS Twin Cities, MN
NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 21, 1987, 1:55 PM CDT for Todd County, Minnesota. It was in force for 65 min. 1 report came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Aug 21, 1987, 1:55 PM CDT (18:55 UTC)
- Expired
- Aug 21, 1987, 3:00 PM CDT
- In force
- 65 min
- Issued by
- NWS Twin Cities, MN
- Area
- Whole counties
County Todd County, MN
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 21, 2:08 PM CDT | Hail 0.75 | Todd, MN |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.
The nearest sounding before it
Minneapolis, MN (KSTC), launched 12:00Z, 6.9 hours before the alert went out and 169 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
- 1133 J/kg
- Mixed-layer CIN
- -142 J/kg
- Mixed-layer LCL
- 643 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 138 m²/s²
- 0-3 km storm-relative helicity
- 96 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.5
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
The office that day
Everything else NWS Twin Cities, MN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 21, 2:12 AM CDT | Severe Thunderstorm Warning | MPX | Waseca | 18 min |
| Aug 21, 2:23 AM CDT | Severe Thunderstorm Warning | MPX | Freeborn, Steele | 22 min |
| Aug 21, 2:39 AM CDT | Severe Thunderstorm Warning | MPX | Dodge, Mower | 36 min |
| Aug 21, 2:25 PM CDT | Severe Thunderstorm Warning | MPX | Morrison | 65 min |
| Aug 21, 3:25 PM CDT | Severe Thunderstorm Warning | MPX | Chippewa, Lac qui Parle | 60 min |
| Aug 21, 3:55 PM CDT | Severe Thunderstorm Warning | MPX | Yellow Medicine | 50 min |
Nearby
Severe Thunderstorm Warnings in Minnesota, 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.