Alert archive / Iowa / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 133, NWS Sioux Falls, SD

August 16, 1987Sioux County, Iowa

NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 16, 1987, 12:19 AM CDT for Sioux County, Iowa. It was in force for 56 min.

The area

The counties it named.

The facts

Issued: Aug 16, 1987, 12:19 AM CDT (05:19 UTC)
Expired: Aug 16, 1987, 1:15 AM CDT
In force: 56 min
Issued by: NWS Sioux Falls, SD
Area: Whole counties

County Sioux County, IA

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

Omaha, NE (KOAX), launched 00:00Z, 5.3 hours before the alert went out and 197 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 3633 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 207 m²/s²
0-3 km storm-relative helicity: 316 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

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

Local storm report, Aug 15, 8:28 PM CDT, 3 hours 51 minutes before

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Special weather statement, Aug 15, 8:50 PM CDT, 3 hours 29 minutes before

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Special weather statement, Aug 15, 9:43 PM CDT, 2 hours 36 minutes before

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Special weather statement, Aug 15, 10:42 PM CDT, 1 hour 37 minutes before

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Special weather statement, Aug 15, 11:44 PM CDT, 35 minutes before

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      <h1 id="headline">This service is currently unavailable.</h1>
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Local storm report, Aug 16, 12:13 AM CDT, 6 minutes before

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      <p id="message2">
        Please try again in a few minutes.
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        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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The office that day

Everything else NWS Sioux Falls, SD issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 15, 7:48 PM CDT	Severe Thunderstorm Warning	FSD	Bon Homme, Charles Mix	57 min
Aug 15, 8:12 PM CDT	Severe Thunderstorm Warning	FSD	Yankton	63 min
Aug 15, 9:05 PM CDT	Severe Thunderstorm Warning	FSD	McCook, Minnehaha	55 min
Aug 15, 9:22 PM CDT	Severe Thunderstorm Warning	FSD	Minnehaha, Moody	68 min
Aug 16, 12:59 AM CDT	Severe Thunderstorm Warning	FSD	Osceola	61 min
Aug 15, 9:22 PM CDT	Severe Thunderstorm Warning	FSD	Pipestone	68 min

Nearby

Severe Thunderstorm Warnings in Iowa, 1987 Every 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.