Alert archive / South Dakota / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 74, NWS Aberdeen, SD

June 14, 2018Corson County, Dewey County, Walworth County, South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Jun 14, 2018, 9:49 PM MDT for Corson County, Dewey County, Walworth County, South Dakota. It was in force for 26 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jun 14, 2018, 9:49 PM MDT (03:49 UTC)
Expired: Jun 14, 2018, 10:15 PM MDT
In force: 26 min
Issued by: NWS Aberdeen, SD
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Corson County, SD, Dewey County, SD, Walworth County, SD

The radar

The Bismarck radar (KBIS), 149 km from the middle of the area, began a volume at 03:52 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jun 14, 2:40 PM MDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 00:00Z, 3.8 hours before the alert went out and 149 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: 2531 J/kg
Mixed-layer CIN: -283 J/kg
Mixed-layer LCL: 1747 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 73 m²/s²
0-3 km storm-relative helicity: 137 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

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.

NWS Aberdeen, SD wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 14, 8:10 PM MDT, 1 hour 39 minutes earlier.

Area forecast discussion, Jun 14, 8:10 PM MDT, 1 hour 39 minutes before

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In the hours before

Special weather statement, Jun 14, 7:23 PM MDT, 2 hours 26 minutes before

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Local storm report, Jun 14, 8:01 PM MDT, 1 hour 48 minutes before

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Local storm report, Jun 14, 8:37 PM MDT, 1 hour 12 minutes before

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Special weather statement, Jun 14, 8:45 PM MDT, 1 hour 4 minutes before

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Special weather statement, Jun 14, 8:46 PM MDT, 1 hour 3 minutes before

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Special weather statement, Jun 14, 9:38 PM MDT, 11 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 14, 6:13 PM MDT	Special Weather Statement	ABR	Corson	32 min
Jun 14, 6:29 PM MDT	Special Weather Statement	ABR	Dewey	31 min
Jun 14, 6:39 PM MDT	Severe Thunderstorm Warning	ABR	Corson	38 min
Jun 14, 7:23 PM MDT	Special Weather Statement	ABR	Corson	52 min
Jun 14, 8:45 PM MDT	Special Weather Statement	ABR	Dewey	30 min
Jun 14, 8:46 PM MDT	Special Weather Statement	ABR	Corson	29 min
Jun 14, 9:38 PM MDT	Special Weather Statement	ABR	Walworth	37 min
Jun 14, 10:14 PM MDT	Severe Thunderstorm Warning	ABR	Brown, Edmunds, McPherson	46 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 2018 Every severe thunderstorm warning in 2018

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.