Alert archive / South Dakota / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 3, NWS Rapid City, SD

May 7, 2002Tripp County, South Dakota

NWS Rapid City, SD issued this severe thunderstorm warning at May 7, 2002, 4:29 PM CDT for Tripp County, South Dakota. It was in force for 46 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: May 7, 2002, 4:29 PM CDT (21:29 UTC)
Expired: May 7, 2002, 5:15 PM CDT
In force: 46 min
Issued by: NWS Rapid City, SD
Area: Counties, with a storm outline in the text

County Tripp County, SD

What was reported inside it

Time	Report	Where	Remark
May 7, 4:43 PM CDT	Hail 1.75	Winner, 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

Aberdeen, SD (KABR), launched 12:00Z, 9.5 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 571 m above ground
0-6 km bulk shear: 78 kt
0-1 km storm-relative helicity: -93 m²/s²
0-3 km storm-relative helicity: 21 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 May 7, 3:40 PM CDT, 49 minutes earlier.

Area forecast discussion, May 7, 3:40 PM CDT, 49 minutes before

AREA FORECAST DISCUSSION FOR WESTERN SD AND NORTHEASTERN WY
NATIONAL WEATHER SERVICE RAPID CITY SD
240 PM MDT TUE MAY 7 2002

MAIN FCST PROB IS TNGT WITH PRECIP TYPE ACRS NW SD. E-SE SFC WINDS
ADVECTING DEW POINTS IN THE MID TO UPR 30S INTO NW SD ATTM. EXPECT
THESE WINDS TO CONTINUE TO AROUND 06Z AND START TO SHIFT TO THE N.
BEFORE THE WINDS SHIFT THOUGH...BASED ON KRAP 18Z SOUNDING AND FCST
UPR LVL TEMPS...MOST OF THE PRECIP BEFORE 06Z ACRS ENTIRE CWA SHLD
BE ALL RAIN. AFTER MIDNIGHT...COLDER AIR STARTS TO FILTER IN AND AS
WINDS SHIFT TO THE N...LWR DEW POINTS WILL MOVE INTO THE NW. LKS
LIKE THERE WL BE A PERIOD WHERE SOME SLEET COULD OCCUR AND THEN
CHANGE OVER TO SNOW. SOME AREAS MAY SEE UP TO 2 INCHES OF SNOW BY
MRNG. WL ISSUE A WINTER WX ADVISORY FOR MIXED PRECIP OVER THIS AREA.
ELSEWHERE...SOME AREAS OF THE HILLS...ESP HIGHER ELEVATIONS OF NRN
HILLS WL LIKELY SEE SNOW BY MRNG AS WELL BUT DO NOT EXPECT MUCH
ACCUMULATION. ALL RAIN EXPECTED SRN HALF OF CWA. STILL HAVE GD
MOISTURE AROUND IN THE MRNG HRS WED AND WITH H50 TROF AXIS STILL
LAGGING BEHIND THE H70 LO...MAY STILL SEE SOME PRECIP FALL EARLY.
STILL LKS LIKE ALL SNOW N...A MIX CENTRAL AND ALL RAIN S. WINDS WL
ALSO BE A CONCERN AS SFC LO PUSHES INTO MIDWEST AND HI BUILDS INTO
MT. NOT A CLASSIC HIGH WIND SCENARIO...BUT MDLS SHOWING STRONG WINDS
MIXING DOWN IN THE AFTN. HAVE WORDED ZNS WITH 25-35 MPH WITH GUSTS
TO 50 MPH IN USUAL WINDY AREAS. MAY NEED A HIGH WIND WARNING IF
LATER MDL RUNS LK SIMILAR. TEMPS WL ALSO BE COOL AGAIN WITH MOST
AREAS NOT MAKING IT OUT OF THE 40S.

WED NIGHT...SOME MOISTURE TO WRAP AROUND H50 LO AS IT MOVES E OF
AREA. SOME LIFT ALSO PROVIDED ON THE BACK SIDE OF THE LO AND PLENTY
OF COLD AIR TO GET SOME SHSN GOING IN THE NW. WINDS WL
CONTINUE...BUT GRADUALLY DIE OFF THROUGH THE NIGHT. LOWS WL LIKELY
MAKE IT TO FREEZING A LTL BELOW BY MRNG. THU...HIGH PUSHES OFF TO
THE E AND WE GET SOME RETURN FLOW ACRS CWA AND A WARMING TREND.
HIGHS SHLD MAKE IT INTO THE LWR TO MID 50S...A LTL ABV MOS BASED ON
H85 TEMPS AND PLENTY OF SUN. NEXT CHC FOR PRECIP COMES FRI AS NEXT
TROF DIGS INTO NRN UT/SRN ID. CHC FOR TSRA AS INITIAL S/W MOVES THRU
WITH SE SFC WINDS BRINGING UP GD AMOUNT OF MOISTURE.

IN THE EXTENDED...RAIN CONTINUES INTO SAT AS UPR LO MOVES ACRS CWA
WITH COOL TEMPS ONCE AGAIN. GRADUAL WARMING TREND THRU TUE AS RDG
BUILDS ACRS THE W AND MOVES INTO REGION. THERE IS A CHC FOR TSMS
LATE MON AND TUE AS RDG AXIS MOVES E OF CWA AND SW FLOW RETURNS.

.UNR...WNTR WX ADV FAR NW SD TNGT.

JMG

In the hours before

Local storm report, May 7, 4:04 PM CDT, 25 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RAPID CITY SD
304 PM MDT TUE MAY 07 2002

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

0230 PM    7 E CLEARFIELD            SD   .75 INCH HAIL
05/07/02   TRIPP                          SPOTTER REPORT

0245 PM    MILLBORO                  SD   .88 INCH HAIL
05/07/02   TRIPP                          SPOTTER REPORTED

The office that day

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

Issued	Product	Office	Counties	Lasted
May 7, 3:23 PM CDT	Severe Thunderstorm Warning	UNR	Tripp	37 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 2002 Every 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.