Alert archive / Iowa / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 10, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Jun 7, 1987, 6:18 PM CDT for Lyon County, Iowa. It was in force for 57 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
- Jun 7, 1987, 6:18 PM CDT (23:18 UTC)
- Expired
- Jun 7, 1987, 7:15 PM CDT
- In force
- 57 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
County Lyon County, IA
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 |
|---|---|---|---|
| Jun 7, 6:18 PM CDT | Tornado F0 | Lyon, IA |
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
Omaha, NE (KOAX), launched 12:00Z, 11.3 hours before the alert went out and 230 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 3626 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- 48 m²/s²
- 0-3 km storm-relative helicity
- 74 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.
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, Jun 7, 4:45 PM CDT, 1 hour 33 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE HURON SD 440 PM CDT SUN JUN 7 1987 ...SEVERE THUNDERSTORM WATCH FOR SOUTHERN AND EASTERN SOUTH DAKOTA AND INTO MINNESOTA UNTIL 10 PM CDT... AT 425 PM CDT...WIDELY SCATTERED THUNDERSTORMS WITH VERY HEAVY RAIN CONTINUED TO DEVELOPED OVER CENTRAL AND EASTERN SOUTH DAKOTA AND WESTERN MINNESOTA. SCATTERED THUNDERSTORMS CONTINUED OVER NORTHERN SOUTH DAKOTA AND SOUTHEASTEhRN NORTH DAKOTA. IN SOUTH DAKOTA...THE STRONGEST STORMS WERE 25 MILES SOUTH OF MITCHELL...NEAR ARMOUR AND PARKSTON. MOVEMENT WAS EAST AT 20 MILES AN HOUR. EDDY
Special weather statement, Jun 7, 5:21 PM CDT, 57 minutes before
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</html>The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 7, 5:09 PM CDT | Severe Thunderstorm Warning | FSD | Lyon | 66 min |
| Jun 7, 4:35 PM CDT | Severe Thunderstorm Warning | FSD | Murray, Nobles | 55 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 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.