Alert archive / South Dakota / Tornado Warnings in 2001

Tornado Warning 12, NWS Rapid City, SD

July 7, 2001Custer County, South Dakota

NWS Rapid City, SD issued this tornado warning at Jul 7, 2001, 6:50 PM MDT for Custer County, South Dakota. It was in force for 40 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 7, 2001, 6:50 PM MDT (00:50 UTC)
Expired: Jul 7, 2001, 7:30 PM MDT
In force: 40 min
Issued by: NWS Rapid City, SD
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Custer County, SD

The radar

The Rapid City radar (KUDX), 70 km from the middle of the area, began a volume at 00:53 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 7, 7:27 PM MDT	Hail 1.75	Custer, SD	Golfball sized hail fell for 10 minutes.

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

Rapid City, SD (KUNR), launched 00:00Z, 0.8 hours before the alert went out and 63 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1571 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: -63 m²/s²
0-3 km storm-relative helicity: 38 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

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 7, 4:40 PM MDT, 2 hours 10 minutes earlier.

Area forecast discussion, Jul 7, 4:40 PM MDT, 2 hours 10 minutes before

AREA FORECAST DISCUSSION FOR WESTERN SD AND NORTHEASTERN WY
NATIONAL WEATHER SERVICE RAPID CITY SD
440 PM MDT SAT JUL 7 2001

WL UPDATE ZONES TO PUT SVR WATCH INTO SW SD ZONES.

.UNR...SEVERE THUNDERSTORM WATCH UNTIL 1000 PM MDT FOR SOUTHWESTERN
       SOUTH DAKOTA.

In the hours before

Local storm report, Jul 7, 2:51 PM MDT, 3 hours 59 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RAPID CITY SD
251 PM MDT SAT JUL 07 2001

TIME(MDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0225 PM    JOHNSON SIDING            SD   .75 INCH HAIL
07/07/01   PENNINGTON                     REPORTED BY OFF-DUTY
                                          NWS EMPLOYEE.

Local storm report, Jul 7, 3:12 PM MDT, 3 hours 38 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RAPID CITY SD
312 PM MDT SAT JUL 07 2001

TIME(MDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0305 PM    KEYSTONE                  SD   1.75 INCH HAIL
07/07/01   PENNINGTON                     REPORTED BY HAM RADIO
                                          OPERATOR.

Local storm report, Jul 7, 4:46 PM MDT, 2 hours 4 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RAPID CITY SD
446 PM MDT SAT JUL 07 2001

TIME(MDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....A

0630 PM    10 SW MOORCROFT           WY   .75 INCH HAIL
07/06/01   CROOK                          REPORTED BY PUBLIC.

The office that day

Everything else NWS Rapid City, SD issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 7, 6:34 PM MDT	Severe Thunderstorm Warning	UNR	Custer	56 min
Jul 7, 7:30 PM MDT	Severe Thunderstorm Warning	UNR	Custer	45 min
Jul 7, 8:39 PM MDT	Severe Thunderstorm Warning	UNR	Lawrence	66 min
Jul 8, 2:44 PM MDT	Severe Thunderstorm Warning	UNR	Pennington	46 min
Jul 8, 3:01 PM MDT	Severe Thunderstorm Warning	UNR	Custer	59 min
Jul 8, 3:31 PM MDT	Severe Thunderstorm Warning	UNR	Pennington	29 min
Jul 8, 4:13 PM MDT	Severe Thunderstorm Warning	UNR	Custer	47 min
Jul 8, 5:00 PM MDT	Severe Thunderstorm Warning	UNR	Custer	60 min
Jul 8, 5:35 PM MDT	Severe Thunderstorm Warning	UNR	Lawrence, Pennington	55 min
Jul 7, 6:32 PM MDT	Severe Thunderstorm Warning	UNR	Weston	58 min
Jul 7, 7:29 PM MDT	Severe Thunderstorm Warning	UNR	Weston	46 min
Jul 8, 2:50 PM MDT	Severe Thunderstorm Warning	UNR	Campbell	40 min
Jul 8, 2:57 PM MDT	Severe Thunderstorm Warning	UNR	Crook	63 min
Jul 8, 3:54 PM MDT	Severe Thunderstorm Warning	UNR	Crook	66 min
Jul 8, 4:55 PM MDT	Severe Thunderstorm Warning	UNR	Crook	65 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.