Alert archive / South Dakota / Severe Thunderstorm Warnings in 2016

Severe Thunderstorm Warning 313, NWS Rapid City, SD

August 9, 2016Harding County, Perkins County, South Dakota

NWS Rapid City, SD issued this severe thunderstorm warning at Aug 9, 2016, 8:17 PM MDT for Harding County, Perkins County, South Dakota. It was in force for 50 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: Aug 9, 2016, 8:17 PM MDT (02:17 UTC)
Expired: Aug 9, 2016, 9:07 PM MDT
In force: 50 min
Issued by: NWS Rapid City, SD
Area: Storm-based polygon
Hail: 2.5 in
Wind: 60.0 mph

Counties Harding County, SD, Perkins County, SD

The radar

The Rapid City radar (KUDX), 157 km from the middle of the area, began a volume at 02:17 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
Aug 9, 4:16 PM MDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Rapid City, SD (KUNR), launched 00:00Z, 2.3 hours before the alert went out and 163 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: 2188 J/kg
Mixed-layer CIN: -145 J/kg
Mixed-layer LCL: 2056 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 112 m²/s²
0-3 km storm-relative helicity: 213 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.6

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 Rapid City, SD wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 9, 8:01 PM MDT, 16 minutes earlier.

Area forecast discussion, Aug 9, 8:01 PM MDT, 16 minutes before

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Hazardous weather outlook, Aug 9, 6:51 AM MDT, 13 hours 26 minutes before

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In the hours before

Local storm report, Aug 9, 7:26 PM MDT, 51 minutes before

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Local storm report, Aug 9, 7:37 PM MDT, 40 minutes before

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Local storm report, Aug 9, 7:38 PM MDT, 39 minutes before

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Local storm report, Aug 9, 7:46 PM MDT, 31 minutes before

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Local storm report, Aug 9, 8:00 PM MDT, 17 minutes before

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Local storm report, Aug 9, 8:06 PM MDT, 11 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 9, 6:03 PM MDT	Special Weather Statement	UNR	Lawrence	42 min
Aug 9, 6:45 PM MDT	Severe Thunderstorm Warning	UNR	Harding	60 min
Aug 9, 7:31 PM MDT	Severe Thunderstorm Warning	UNR	Harding	29 min
Aug 9, 7:40 PM MDT	Severe Thunderstorm Warning	UNR	Harding	50 min
Aug 9, 8:00 PM MDT	Severe Thunderstorm Warning	UNR	Harding	31 min
Aug 9, 9:05 PM MDT	Severe Thunderstorm Warning	UNR	Perkins	70 min
Aug 9, 9:13 PM MDT	Special Weather Statement	UNR	Custer	32 min
Aug 9, 9:39 PM MDT	Severe Thunderstorm Warning	UNR	Perkins, Ziebach	51 min
Aug 9, 10:05 PM MDT	Special Weather Statement	UNR	Oglala Lakota	25 min
Aug 9, 10:24 PM MDT	Severe Thunderstorm Warning	UNR	Ziebach	22 min
Aug 9, 10:31 PM MDT	Special Weather Statement	UNR	Oglala Lakota	29 min
Aug 9, 10:57 PM MDT	Special Weather Statement	UNR	Pennington	33 min
Aug 9, 11:39 PM MDT	Special Weather Statement	UNR	Oglala Lakota	36 min
Aug 10, 3:11 AM MDT	Heat Advisory	UNR	Mellette, Todd, Tripp	16 hr
Aug 10, 4:06 PM MDT	Special Weather Statement	UNR	Lawrence	39 min
Aug 10, 4:09 PM MDT	Special Weather Statement	UNR	Lawrence	51 min
Aug 10, 4:45 PM MDT	Special Weather Statement	UNR	Butte	45 min
Aug 10, 4:53 PM MDT	Special Weather Statement	UNR	Custer	52 min
Aug 10, 5:13 PM MDT	Severe Thunderstorm Warning	UNR	Pennington	23 min
Aug 10, 5:52 PM MDT	Severe Thunderstorm Warning	UNR	Butte, Harding	38 min
Aug 10, 2:57 PM MDT	Special Weather Statement	UNR	Weston	48 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 2016 Every severe thunderstorm warning in 2016

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.