Alert archive / South Dakota / Tornado Warnings in 2018

Tornado Warning 19, NWS Rapid City, SD

July 29, 2018Bennett County, Jackson County, Oglala Lakota County, South Dakota

NWS Rapid City, SD issued this tornado warning at Jul 29, 2018, 2:07 PM MDT for Bennett County, Jackson County, Oglala Lakota 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, 2018, 2:07 PM MDT (20:07 UTC)
Expired: Jul 29, 2018, 2:45 PM MDT
In force: 38 min
Issued by: NWS Rapid City, SD
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 2.75 in

Counties Bennett County, SD, Jackson County, SD, Oglala Lakota County, SD

The radar

The Rapid City radar (KUDX), 107 km from the middle of the area, began a volume at 20:07 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
Jul 29, 1:34 PM MDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Rapid City, SD (KRAP), launched 12:00Z, 8.1 hours before the alert went out and 105 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: 14 J/kg
Mixed-layer CIN: -187 J/kg
Mixed-layer LCL: 1455 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 40 m²/s²
0-3 km storm-relative helicity: 102 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this tornado 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 tornado warning went out at Jul 29, 11:30 AM MDT, 2 hours 37 minutes earlier.

Area forecast discussion, Jul 29, 11:30 AM MDT, 2 hours 37 minutes before

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Hazardous weather outlook, Jul 29, 5:03 AM MDT, 9 hours 4 minutes before

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In the hours before

Local storm report, Jul 29, 1:38 PM MDT, 29 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 29, 1:24 PM MDT	Severe Thunderstorm Warning	UNR	Custer, Fall River	27 min
Jul 29, 1:38 PM MDT	Severe Thunderstorm Warning	UNR	Bennett, Jackson, Oglala Lakota	67 min
Jul 29, 2:26 PM MDT	Severe Thunderstorm Warning	UNR	Butte, Lawrence, Meade	64 min
Jul 29, 2:30 PM MDT	Severe Thunderstorm Warning	UNR	Fall River, Oglala Lakota	32 min
Jul 29, 2:46 PM MDT	Severe Thunderstorm Warning	UNR	Bennett	27 min
Jul 29, 3:21 PM MDT	Severe Thunderstorm Warning	UNR	Custer, Lawrence, Pennington	54 min
Jul 29, 3:57 PM MDT	Special Weather Statement	UNR	Pennington	33 min
Jul 29, 4:00 PM MDT	Areal Flood Advisory	UNR	Custer, Pennington	5 hr
Jul 28, 9:09 PM MDT	Severe Thunderstorm Warning	UNR	Campbell	66 min
Jul 28, 10:05 PM MDT	Severe Thunderstorm Warning	UNR	Campbell, Crook, Weston	55 min
Jul 28, 10:50 PM MDT	Special Weather Statement	UNR	Crook	25 min
Jul 28, 10:55 PM MDT	Severe Thunderstorm Warning	UNR	Campbell, Weston	26 min
Jul 28, 11:25 PM MDT	Special Weather Statement	UNR	Crook	35 min
Jul 28, 11:26 PM MDT	Special Weather Statement	UNR	Weston	34 min
Jul 29, 3:46 PM MDT	Special Weather Statement	UNR	Campbell	29 min

Nearby

Tornado Warnings in South Dakota, 2018 Every tornado warning in 2018 Tornadoes 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.