Alert archive / South Dakota / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 4, NWS Rapid City, SD

May 27, 2002Bennett County, South Dakota

NWS Rapid City, SD issued this severe thunderstorm warning at May 27, 2002, 4:29 PM MDT for Bennett County, South Dakota. It was in force for 46 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
May 27, 2002, 4:29 PM MDT (22:29 UTC)
Expired
May 27, 2002, 5:15 PM MDT
In force
46 min
Issued by
NWS Rapid City, SD
Area
Counties, with a storm outline in the text

County Bennett County, SD

The watch it was issued in

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

IssuedProductOfficeLasted
May 27, 1:45 PM MDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 10.5 hours before the alert went out and 246 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, N. Platte/Lee Bi, NE at 12:00Z on 2002-05-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 44 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, N. Platte/Lee Bi, NE at 12:00Z on 2002-05-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 9 square meters per square second.193958Sfc1 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
44 J/kg
Mixed-layer CIN
-490 J/kg
Mixed-layer LCL
1682 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
9 m²/s²
0-3 km storm-relative helicity
63 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 27, 2:30 PM MDT, 1 hour 59 minutes earlier.

Area forecast discussion, May 27, 2:30 PM MDT, 1 hour 59 minutes before
AREA FORECAST DISCUSSION FOR WESTERN SD AND NORTHEASTERN WY
NATIONAL WEATHER SERVICE RAPID CITY
230 PM MDT MON MAY 27 2002

S/W MVG THRU FA KICKING OFF TSTMS. AIR MASS UNSTABLE WITH DECENT
SHEAR SO A FEW SVR STORMS ARE POSSIBLE...ESP ACRS SRN FA. STORMS
SHLD DIMINISH THIS EVENING AS S/W MVS E.

ON TUES...ANOTHER S/W WL PASS ACRS FA. AGAIN BEST INSTABILITY AND
CAPE OVR SRN PORTION FA. WL CONT WITH CHC TSTMS IN AFT/EVENING.

LKS DRY FOR WED/THU...WITH TEMPS WELL INTO 80S ON THURSDAY.

IN THE EXTENDED...LKS WARM AND DRY ON FRI WITH CHC TSTMS FOR SAT
THRU MON. MRF MUCH COOLER THAN AVN...WL GO WITH WARMER SOLUTION AS
THIS IS MORE REASONABLE THIS TIME OF YEAR IN NRN PORTION OF UPPER
RIDGE.

.UNR...SEVERE THUNDERSTORM WATCH UNTIL 800 PM MDT (900 PM CDT) FOR
       ALL OF WESTERN SOUTH DAKOTA EXCEPT HARDING AND PERKINS
       COUNTIES.

The office that day

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

IssuedProductOfficeCountiesLasted
May 27, 5:12 PM MDTSevere Thunderstorm WarningUNRTodd48 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; the sounding from the Mesonet's radiosonde archive.