Alert archive / South Dakota / Tornado Warnings in 2001

Tornado Warning 18, NWS Rapid City, SD

July 25, 2001Bennett County, South Dakota

NWS Rapid City, SD issued this tornado warning at Jul 25, 2001, 6:59 PM MDT for Bennett County, South Dakota. It was in force for 46 min. 2 reports 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 25, 2001, 6:59 PM MDT (00:59 UTC)
Expired: Jul 25, 2001, 7:45 PM MDT
In force: 46 min
Issued by: NWS Rapid City, SD
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Bennett County, SD

The radar

The Rapid City radar (KUDX), 140 km from the middle of the area, began a volume at 01:01 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 25, 7:05 PM MDT	Hail 1.75	Martin, SD
Jul 25, 7:05 PM MDT	Thunderstorm Wind 52 E	Martin, SD	Three inch diameter tree branches were broken off.

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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 25, 2:45 PM MDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Rapid City, SD (KUNR), launched 00:00Z, 1.0 hours before the alert went out and 138 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: 1880 J/kg
Mixed-layer CIN: -126 J/kg
Mixed-layer LCL: 542 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 64 m²/s²
0-3 km storm-relative helicity: 193 m²/s²
Significant tornado parameter: 0.8
Supercell composite: 5.9

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 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 25, 2:30 PM MDT, 4 hours 29 minutes earlier.

Area forecast discussion, Jul 25, 2:30 PM MDT, 4 hours 29 minutes before

AREA FORECAST DISCUSSION FOR WESTERN SD AND NORTHEASTERN WY
NATIONAL WEATHER SERVICE RAPID CITY SD
230 PM MDT WED JUL 25 2001

SFC LOW NEAR WY/SD/NE INTERSECTION WITH WARM FRONT EXTDG EWD ALONG
AXIS JUST SOUTH OF RAP. THIS FEATURES QUITE EVIDENT ON KUDX RADAR.
STRONG CONVERGENCE ALONG BNDRY ALONG WITH HEATING ALREADY FIRING
CONVECTION OVER THE HILLS.  CAPES IN EXCESS OF 2000 J/KG ALONG WITH
STRONG LO LVL SHEAR WILL SUPPORT STRONG ROTATING UPDRAFTS FOR SOME
TORNADIC SUPERCELL DEVELOPMENT...ESPECIALLY JUST NORTH OF BNDRY.
HAVE COORDINATED WITH SPC AND TORNADO WATCH WILL BE ISSUED FOR MUCH
OF SWRN SD UNTIL 900 PM MDT. NOCTURNAL LO LVL JET WILL FEED ANY MCS
THAT DVLPS.

UPR TROF MOVES CLOSER TO REGION THU AND FRI FOR AN INCREASED THREAT
OF PCPN ACRS ENTIRE AREA THESE DAYS.  UPR TROF AXIS SHIFTS E OF AREA
FRI NIGHT FOR DIMINISHING PCPN.

EXTENDED...ANY UPPER RIDGING BEHIND SHORT WAVE TROF THAT MOVES
ACROSS AREA FRI NIGHT WILL LIKELY BE SHORT LIVED. MRF SEEMS TOO
PROGRESSIVE WITH LONG WAVE TROF ALONG WEST COAST...AND WILL OPT
TOWARDS ENSEMBLES/ECMWF SOLUTION KEEPING TROF WELL WEST OF AREA.
THUS...SW FLOW ALOFT AND WARM TEMPS WL CONT WITH CHANCE OF
THUNDERSTORMS AT ANY TIME.

.UNR...TORNADO WATCH PORTIONS OF WRN SD UNTIL 900 PM MDT.
JOHNSON

In the hours before

Local storm report, Jul 25, 4:42 PM MDT, 2 hours 17 minutes before

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Local storm report, Jul 25, 5:19 PM MDT, 1 hour 40 minutes before

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Local storm report, Jul 25, 5:51 PM MDT, 1 hour 8 minutes before

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Special weather statement, Jul 25, 6:08 PM MDT, 51 minutes before

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Local storm report, Jul 25, 6:55 PM MDT, 4 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 25, 6:05 PM MDT	Tornado Warning	UNR	Bennett	55 min
Jul 26, 4:00 AM MDT	Severe Thunderstorm Warning	UNR	Meade	30 min
Jul 26, 4:30 AM MDT	Severe Thunderstorm Warning	UNR	Meade, Ziebach	60 min
Jul 26, 7:40 AM MDT	Severe Thunderstorm Warning	UNR	Ziebach	65 min
Jul 26, 5:05 PM MDT	Severe Thunderstorm Warning	UNR	Lawrence	25 min
Jul 26, 5:12 PM MDT	Severe Thunderstorm Warning	UNR	Butte	63 min
Jul 26, 1:07 AM MDT	Severe Thunderstorm Warning	UNR	Crook	38 min
Jul 26, 4:34 PM MDT	Tornado Warning	UNR	Campbell	41 min
Jul 26, 5:00 PM MDT	Tornado Warning	UNR	Crook	45 min
Jul 26, 5:14 PM MDT	Tornado Warning	UNR	Campbell	31 min

Nearby

Tornado Warnings in South Dakota, 2001 Every tornado warning in 2001 Tornadoes 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.