Alert archive / South Dakota / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 47, NWS Rapid City, SD

June 29, 2002Perkins County, South Dakota

NWS Rapid City, SD issued this severe thunderstorm warning at Jun 29, 2002, 3:20 PM MDT for Perkins County, South Dakota. It was in force for 55 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
Jun 29, 2002, 3:20 PM MDT (21:20 UTC)
Expired
Jun 29, 2002, 4:15 PM MDT
In force
55 min
Issued by
NWS Rapid City, SD
Area
Counties, with a storm outline in the text

County Perkins County, SD

What was reported inside it

TimeReportWhereRemark
Jun 29, 3:30 PM MDTThunderstorm Wind 52 EZeona, 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

Bismarck Municip, ND (KBIS), launched 12:00Z, 9.3 hours before the alert went out and 197 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-pSkew-T log-p diagram, Bismarck Municip, ND at 12:00Z on 2002-06-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 39 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Bismarck Municip, ND at 12:00Z on 2002-06-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 28 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
39 J/kg
Mixed-layer CIN
-561 J/kg
Mixed-layer LCL
3383 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
28 m²/s²
0-3 km storm-relative helicity
105 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 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 29, 2:55 PM MDT, 25 minutes earlier.

Area forecast discussion, Jun 29, 2:55 PM MDT, 25 minutes before
AREA FORECAST DISCUSSION FOR WESTERN SD AND NORTHEASTERN WY
NATIONAL WEATHER SERVICE RAPID CITY
255 PM MDT SAT JUN 29 2002

MAIN PROBS TONIGHT WL BE DRY LIGHTNING IN TSTMS AND STRONG NW WNDS
BEHING CDFNT NOW IN CENT MONTANA. MAIN AREA OF TSTMS SHLD REMAIN
NORTH OF FA...THO SOUTHERN END MY CLIP PARTS OF HARDING AND PERKINS
COUNTIES. SVR THREAT AGAIN WL BE WITH DAMAGING WINDS.

EXPECT WINDS TO PICK UP IN NW SD ARD 900 PM AND ON THE PLAINS BY
MIDNIGHT BEHIND CDFNT. AT THIS TIME WL GO WITH ADVISORY...25 TO 35
MPH WITH GUSTS TO 50 MPH. WINDS SHLD LAST 4-6 HRS WITH WINDS
DIMINISHING BY LATE TONIGHT OR EARLY SUN AM.

SUNDAY WL BE MUCH COOLER...HIGHS MOSTLY IN 80S...BUT CONT DRY WITH
LOW RHS. ANOTHER S/W WL MV N OF FA MON NIGHT...WITH THERMAL RIDGE
OVR AREA WL LIKELY BE ANOTHER WARM NIGHT. BEHIND THIS S/W...TEMPS
SHLD BE NEAR SEASONABLE ON MON/TUE WITH AN ISOLD TSTM POSS IN
AFT/EVN.

ISOLATED STORMS WITH DRY LIGHTNING AHEAD OF CDFNT...STG NW WINDS
BEHIND CDFNT WILL BLOW FOR 3-6 HRS. ALONG WITH CRITICALLY DRY
FUELS AND VERY LOW RHS...WILL CONTINUE RED FLAG WARNING FOR TONIGHT.

IN THE EXTENDED...WED THRU FRI LKS MAINLY DRY AS UPPER RIDGE WL CONT
TO DOMINATE WX. TEMPS WL BE NEAR NORMAL ON WED BEFORE WARMING BACK
INTO 90S ON THU/FRI WITH SOME 100S ON PLAINS. NEXT CHC OF PCPN WL BE
WITH CDFNT AND S/W ON SAT.

.UNR...RED FLAG WARNING NORTHEAST WYOMING AND BLACK HILLS FOR
       TONIGHT.
    ...WIND ADVISORY FOR MUCH OF WESTERN SOUTH DAKOTA FOR TONIGHT...

In the hours before

Local storm report, Jun 29, 9:24 AM MDT, 5 hours 56 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jun 28, 7:14 PM MDTSevere Thunderstorm WarningUNRHarding61 min
Jun 28, 9:52 PM MDTSevere Thunderstorm WarningUNRPerkins53 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 2002Every severe thunderstorm warning in 2002

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.