Alert archive / South Dakota / Severe Thunderstorm Warnings in 2016

Severe Thunderstorm Warning 239, NWS Rapid City, SD

July 29, 2016Pennington County, South Dakota

NWS Rapid City, SD issued this severe thunderstorm warning at Jul 29, 2016, 2:37 PM MDT for Pennington County, South Dakota. It was in force for 38 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: Jul 29, 2016, 2:37 PM MDT (20:37 UTC)
Expired: Jul 29, 2016, 3:15 PM MDT
In force: 38 min
Issued by: NWS Rapid City, SD
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

County Pennington County, SD

The radar

The Rapid City radar (KUDX), 13 km from the middle of the area, began a volume at 20:36 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 nearest sounding before it

Rapid City, SD (KRAP), launched 12:00Z, 8.6 hours before the alert went out and 9 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: 46 J/kg
Mixed-layer CIN: -73 J/kg
Mixed-layer LCL: 833 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 36 m²/s²
0-3 km storm-relative helicity: 73 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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 Jul 29, 1:36 PM MDT, 1 hour 1 minute earlier.

Area forecast discussion, Jul 29, 1:36 PM MDT, 1 hour 1 minute before

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Hazardous weather outlook, Jul 29, 4:47 AM MDT, 9 hours 50 minutes before

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In the hours before

Local storm report, Jul 29, 1:28 PM MDT, 1 hour 9 minutes before

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Local storm report, Jul 29, 1:29 PM MDT, 1 hour 8 minutes before

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Local storm report, Jul 29, 1:55 PM MDT, 42 minutes before

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Local storm report, Jul 29, 1:59 PM MDT, 38 minutes before

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Special weather statement, Jul 29, 2:14 PM MDT, 23 minutes before

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Special weather statement, Jul 29, 2:27 PM MDT, 10 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
Jul 28, 6:32 PM MDT	Special Weather Statement	UNR	Todd	28 min
Jul 29, 12:58 PM MDT	Special Weather Statement	UNR	Custer	47 min
Jul 29, 1:23 PM MDT	Special Weather Statement	UNR	Custer	52 min
Jul 29, 1:32 PM MDT	Severe Thunderstorm Warning	UNR	Pennington	32 min
Jul 29, 1:42 PM MDT	Severe Thunderstorm Warning	UNR	Custer, Fall River	63 min
Jul 29, 2:14 PM MDT	Special Weather Statement	UNR	Custer	31 min
Jul 29, 2:27 PM MDT	Special Weather Statement	UNR	Custer	33 min
Jul 29, 2:48 PM MDT	Special Weather Statement	UNR	Pennington	42 min
Jul 29, 3:15 PM MDT	Severe Thunderstorm Warning	UNR	Custer, Pennington	60 min
Jul 29, 3:38 PM MDT	Severe Thunderstorm Warning	UNR	Lawrence	41 min
Jul 29, 3:43 PM MDT	Severe Thunderstorm Warning	UNR	Custer, Pennington	47 min
Jul 29, 4:07 PM MDT	Severe Thunderstorm Warning	UNR	Custer	53 min
Jul 29, 4:43 PM MDT	Severe Thunderstorm Warning	UNR	Fall River, Oglala Lakota	62 min
Jul 29, 4:56 PM MDT	Special Weather Statement	UNR	Meade	34 min
Jul 29, 5:03 PM MDT	Severe Thunderstorm Warning	UNR	Meade, Pennington	57 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.