Alert archive / South Dakota / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 101, NWS Rapid City, SD

July 1, 2001Mellette County, South Dakota

NWS Rapid City, SD issued this severe thunderstorm warning at Jul 1, 2001, 11:31 AM CDT for Mellette County, South Dakota. It was in force for 44 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Jul 1, 2001, 11:31 AM CDT (16:31 UTC)
Expired: Jul 1, 2001, 12:15 PM CDT
In force: 44 min
Issued by: NWS Rapid City, SD
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Mellette County, SD

The radar

The Rapid City radar (KUDX), 177 km from the middle of the area, began a volume at 16:34 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.

What was reported inside it

Time	Report	Where	Remark
Jul 1, 11:31 AM CDT	Hail 0.75	Wood, SD

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 4.5 hours before the alert went out and 273 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: 502 J/kg
Mixed-layer CIN: -238 J/kg
Mixed-layer LCL: 1256 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 70 m²/s²
0-3 km storm-relative helicity: 153 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.2

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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 Jun 30, 3:50 PM CDT, 19 hours 41 minutes earlier.

Area forecast discussion, Jun 30, 3:50 PM CDT, 19 hours 41 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
Jun 30, 7:09 PM CDT	Severe Thunderstorm Warning	UNR	Meade	66 min
Jun 30, 8:00 PM CDT	Severe Thunderstorm Warning	UNR	Pennington	60 min
Jun 30, 8:23 PM CDT	Severe Thunderstorm Warning	UNR	Lawrence	37 min
Jul 1, 9:56 AM CDT	Severe Thunderstorm Warning	UNR	Harding	64 min
Jul 1, 10:22 AM CDT	Severe Thunderstorm Warning	UNR	Perkins	38 min
Jul 1, 10:47 AM CDT	Severe Thunderstorm Warning	UNR	Butte	43 min
Jul 1, 10:59 AM CDT	Severe Thunderstorm Warning	UNR	Perkins	46 min
Jul 1, 11:57 AM CDT	Severe Thunderstorm Warning	UNR	Tripp	63 min
Jul 1, 12:26 PM CDT	Severe Thunderstorm Warning	UNR	Haakon	64 min
Jul 1, 2:50 AM CDT	Severe Thunderstorm Warning	UNR	Crook	55 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 2001 Every severe thunderstorm warning in 2001

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.