Alert archive / South Dakota / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 261, NWS Rapid City, SD

July 28, 2001Tripp County, South Dakota

NWS Rapid City, SD issued this severe thunderstorm warning at Jul 28, 2001, 9:40 PM CDT for Tripp County, South Dakota. It was in force for 50 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 28, 2001, 9:40 PM CDT (02:40 UTC)
Expired: Jul 28, 2001, 10:30 PM CDT
In force: 50 min
Issued by: NWS Rapid City, SD
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Tripp County, SD

The radar

The North Platte radar (KLNX), 164 km from the middle of the area, began a volume at 02:40 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 28, 10:15 PM CDT	Thunderstorm Wind 52 E	Keyapaha, 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 watch it was issued in

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

Issued	Product	Office	Lasted
Jul 28, 8:45 PM CDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 2.7 hours before the alert went out and 209 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: 712 J/kg
Mixed-layer CIN: -283 J/kg
Mixed-layer LCL: 1464 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 100 m²/s²
0-3 km storm-relative helicity: 350 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.1

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 Jul 28, 3:00 PM CDT, 6 hours 40 minutes earlier.

Area forecast discussion, Jul 28, 3:00 PM CDT, 6 hours 40 minutes before

AREA FORECAST DISCUSSION FOR WESTERN SD AND NORTHEASTERN WY
NATIONAL WEATHER SERVICE RAPID CITY SD
200 PM MDT SAT JUL 28 2001

CURRENT SURFACE MAP HAS TROF ACROSS CENTRAL MONTANA INTO NORTHEAST
WYOMING...WITH HIGH PRESSURE OVER EASTERN DAKOTAS. STRONG SHORTWAVE
TROF MOVING THROUGH NORTHWESTERN U.S. WITH CONVECTION DEVELOPING
OVER THE HIGHER TERRAIN OF MONTANA AND WYOMING.

SHORTWAVE WILL BECOME NEGATIVELY TILTED AS IT MOVES ACROSS MONTANA
TONIGHT. ENOUGH SUPPORT FOR SCATTERED THUNDERSTORMS ACROSS THE FAR
NORTHWEST. FURTHER SOUTH...EVENING THUNDERSTORMS EXPECTED OVER
NORTHEAST WYOMING AND AROUND THE BLACK HILLS IN SOUTH DAKOTA. COLD
FRONT WILL MOVE THROUGH MOST OF THE CWA BY MORNING.

FOR SUNDAY...COLD FRONT STALLS ALONG THE SD/NE BORDER...AND EXTENDS
INTO NORTHEAST SOUTH DAKOTA. WEAK CONVERGENCE ALONG THE FRONT IN THE
AFTERNOON WILL BRING A ISOLATED AFTERNOON THUNDERSTORMS ACROSS
SOUTHWEST SOUTH DAKOTA. OTHER THUNDERSTORMS EXPECTED TO DEVELOP
ACROSS HIGHER TERRAIN OF NORTHEAST WYOMING AND THE BLACK HILLS.

SUNDAY NIGHT...LOW PRESSURE DEVELOPS OVER EAST CENTRAL WYOMING AND
TRACKS EAST THROUGH SOUTH CENTRAL SOUTH DAKOTA. LOW LEVEL JET
INCREASES TO 30-45 KNOTS ACROSS NEBRASKA INTO SOUTH CENTRAL SOUTH
DAKOTA. 850-700MB THREAT-E ADVECTION OF 3-5C/HR FORECAST OVER THE
EASTERN PART OF CWA. WILL GO WITH HIGHER POPS ACROSS THE EASTERN CWA
SUNDAY NIGHT.

MONDAY INTO MONDAY NIGHT...THETA-E AXIS SETS UP OVER NORTHEAST
WYOMING AND SOUTHWEST SOUTH DAKOTA MONDAY AFTERNOON WITH
SOUTHEASTERLY UPSLOPE FLOW...ALLOWING FOR MORE AFTERNOON
THUNDERSTORMS. WEAK SHORTWAVE TO MOVE THROUGH MONDAY NIGHT WITH
THETA-E ADVECTION ACROSS NORTHEAST WYOMING/WESTERN SOUTH DAKOTA.

IN THE EXTENDED...UPPER LEVEL TROF TO MOVE THROUGH THE AREA
TUESDAY/WEDNESDAY WITH A CONTINUED CHANCE OF THUNDERSTORMS. FLOW
BECOME MORE ZONAL THURSDAY THROUGH SATURDAY WITH THE JET STREAM IN
SOUTHEERN CANADA. WILL CONTINUE THE DRY AND WARM WEATHER FOR THE END
OF THE WEEK.

.UNR...NONE.

KC

In the hours before

Local storm report, Jul 28, 6:14 PM CDT, 3 hours 26 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RAPID CITY SD
514 PM MDT SAT JUL 28 2001

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

0435 PM    FAITH                     SD   .88 INCH HAIL
07/28/01   MEADE                          MOSTLY PEA SIZED...BUT
                                          A FEW NICKEL SIZED HIT
                                          A WOMAN IN THE ARM

Local storm report, Jul 28, 6:37 PM CDT, 3 hours 3 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RAPID CITY SD
537 PM MDT SAT JUL 28 2001

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

0314 PM    7 S ENNING                SD   .88 INCH HAIL
07/28/01   MEADE

0320 PM    3 S ENNING                SD   2 INCH HAIL
07/28/01   MEADE                          SPOTTER SAID HAIL WAS
                                          GREATER THAN 2 INCH
                                          DIAMETER

0330 PM    7 S ENNING                SD   1.75 INCH HAIL
07/28/01   MEADE                          EVENT DURATION 20
                                          MINUTES.

0412 PM    13 W CHERRY CREEK         SD   68 MPH TSTM GUST
07/28/01   ZIEBACH

0420 PM    14 NE CREIGHTON           SD   1.75 INCH HAIL
07/28/01   PENNINGTON                     EVENT DURATION 25
                                          MINUTES.

0505 PM    6 NW CREIGHTON            SD   2.75 INCH HAIL
07/28/01   PENNINGTON                     EVENT DURATION 15
                                          MINUTES.

0529 PM    17 N MIDLAND              SD   60 MPH TSTM GUST
07/28/01   HAAKON                         SPOTTER REPORTED WINDS
                                          AT LEAST 60
                                          MPH...LIKELY STRONGER

Local storm report, Jul 28, 6:42 PM CDT, 2 hours 58 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RAPID CITY SD
542 PM MDT SAT JUL 28 2001

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

0415 PM    4 NE ELM SPGS             SD   1.5 INCH HAIL
07/28/01   MEADE

0510 PM    3 E MILESVILLE            SD   .88 INCH HAIL
07/28/01   HAAKON                         ALSO HAD 35 TO 40 MPH
                                          WIND

Special weather statement, Jul 28, 8:55 PM CDT, 45 minutes before

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Local storm report, Jul 28, 9:29 PM CDT, 11 minutes before

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Local storm report, Jul 28, 9:36 PM CDT, 4 minutes before

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    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
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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 28, 7:27 PM CDT	Severe Thunderstorm Warning	UNR	Jackson	63 min
Jul 28, 7:49 PM CDT	Severe Thunderstorm Warning	UNR	Mellette	56 min
Jul 28, 8:38 PM CDT	Severe Thunderstorm Warning	UNR	Todd	67 min
Jul 28, 8:43 PM CDT	Severe Thunderstorm Warning	UNR	Mellette	47 min
Jul 28, 8:52 PM CDT	Severe Thunderstorm Warning	UNR	Tripp	53 min
Jul 28, 9:36 PM CDT	Severe Thunderstorm Warning	UNR	Todd	39 min
Jul 28, 7:53 PM CDT	Severe Thunderstorm Warning	UNR	Weston	67 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.