Alert archive / South Dakota / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 340, NWS Rapid City, SD

August 3, 20184 counties in South Dakota

NWS Rapid City, SD issued this severe thunderstorm warning at Aug 3, 2018, 8:24 PM MDT for 4 counties in South Dakota. It was in force for 66 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 3, 2018, 8:24 PM MDT (02:24 UTC)
Expired: Aug 3, 2018, 9:30 PM MDT
In force: 66 min
Issued by: NWS Rapid City, SD
Area: Storm-based polygon
Hail: 0.75 in
Wind: 70.0 mph

Counties Butte County, SD, Lawrence County, SD, Meade County, SD, Pennington County, SD

The radar

The Rapid City radar (KUDX), 48 km from the middle of the area, began a volume at 02:24 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

Bismarck Municip, ND (KBIS), launched 00:00Z, 2.4 hours before the alert went out and 323 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: 1623 J/kg
Mixed-layer CIN: -93 J/kg
Mixed-layer LCL: 2500 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 89 m²/s²
0-3 km storm-relative helicity: 144 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.8

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 3, 4:51 PM MDT, 3 hours 33 minutes earlier.

Area forecast discussion, Aug 3, 4:51 PM MDT, 3 hours 33 minutes before

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Hazardous weather outlook, Aug 3, 4:27 AM MDT, 15 hours 57 minutes before

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In the hours before

Special weather statement, Aug 3, 3:31 PM MDT, 4 hours 53 minutes before

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Special weather statement, Aug 3, 4:20 PM MDT, 4 hours 4 minutes before

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Local storm report, Aug 3, 8:17 PM MDT, 7 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 3, 7:29 PM MDT	Severe Thunderstorm Warning	UNR	Butte, Custer, Lawrence, Pennington	61 min
Aug 3, 8:47 PM MDT	Severe Thunderstorm Warning	UNR	Butte, Harding	58 min
Aug 3, 9:41 PM MDT	Severe Thunderstorm Warning	UNR	Harding, Perkins	64 min
Aug 3, 10:27 PM MDT	Special Weather Statement	UNR	Ziebach	48 min
Aug 3, 10:56 PM MDT	Severe Thunderstorm Warning	UNR	Ziebach	64 min
Aug 3, 11:46 PM MDT	Special Weather Statement	UNR	Custer	44 min
Aug 4, 12:48 AM MDT	Special Weather Statement	UNR	Oglala Lakota	42 min
Aug 4, 1:07 AM MDT	Severe Thunderstorm Warning	UNR	Oglala Lakota	53 min
Aug 4, 2:43 PM MDT	Special Weather Statement	UNR	Pennington	17 min
Aug 4, 2:52 PM MDT	Severe Thunderstorm Warning	UNR	Pennington	19 min
Aug 4, 4:30 PM MDT	Special Weather Statement	UNR	Perkins	30 min
Aug 4, 4:53 PM MDT	Special Weather Statement	UNR	Butte	22 min
Aug 4, 5:03 PM MDT	Severe Thunderstorm Warning	UNR	Butte, Meade	27 min
Aug 4, 5:09 PM MDT	Special Weather Statement	UNR	Perkins	36 min
Aug 4, 5:42 PM MDT	Special Weather Statement	UNR	Lawrence	18 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.