Alert archive / South Dakota / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 259, NWS Rapid City, SD

August 11, 2000Perkins County, South Dakota

NWS Rapid City, SD issued this severe thunderstorm warning at Aug 11, 2000, 10:17 PM MDT for Perkins County, South Dakota. It was in force for 58 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: Aug 11, 2000, 10:17 PM MDT (04:17 UTC)
Expired: Aug 11, 2000, 11:15 PM MDT
In force: 58 min
Issued by: NWS Rapid City, SD
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Perkins County, SD

The radar

The Rapid City radar (KUDX), 154 km from the middle of the area, began a volume at 04:20 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.

The nearest sounding before it

Rapid City, SD (KUNR), launched 00:00Z, 4.3 hours before the alert went out and 161 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: 795 J/kg
Mixed-layer CIN: -50 J/kg
Mixed-layer LCL: 3260 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 56 m²/s²
0-3 km storm-relative helicity: 128 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.9

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 Aug 11, 2:00 PM MDT, 8 hours 17 minutes earlier.

Area forecast discussion, Aug 11, 2:00 PM MDT, 8 hours 17 minutes before

AREA FORECAST DISCUSSION FOR WESTERN SD AND NORTHEASTERN WY
NATIONAL WEATHER SERVICE RAPID CITY SD
200 PM MDT FRI AUG 11 2000

LATEST SFC ANALYSIS INDC LOW OVER WRN ND WITH COLD FRONT ACROSS
EXTREME NW SD AND INTO NW WY. KUDX RADAR INDC FEW ISOLD TSTMS OVER
NRN BLACK HILLS FOOTHILLS AND OVER NE WY PLAINS. SATELLITE REVEALS
PRETTY GOOD CU DEVELOPMENT OVER NE WY.

MODELS INITIALIZE WELL AND SHOW PRETTY GOOD AGREEMENT. WILL EXPECT
S/WV TO PUSH THROUGH MT/ND THIS EVE WITH GOOD DRYING BEHIND IT.
ISOLD TSTMS THIS EVE...MAINLY ALONG FRONTAL BOUNDARY...WITH VERY
LITTLE ASSOC PRECIP. WEAK CAA WILL SET UP TONIGHT KEEPING TEMPS IN
THE 90S FOR SATURDAY. SUNDAY WILL SEE A RETURN OF WARM AIR...AND A
LITTLE MOISTURE. A SLGHT CHANCE OF AFTNOON TSTMS IN CENT SD ZONES
SUN WITH HIGHS A LITTLE WARMER ON SUN. OTHERWISE WILL LOOK FOR RIDGE
TO FLATTEN OVER THE NRN PLAINS THROUGH 72HRS AS UPPER LOW DEVELOPS
OFF THE WA COAST. THIS NO DOUBT WILL SEND SPURIOUS S/WV ENERGY OVER
THE NRN PLAINS. WITH VERY LIMITED MOISTURE WILL CALL IT
DRY...HOWEVER AN ISOLD TSTM OR TWO IS POSSIBLE DAYS 4 AND 5.

.UNR...RED FLAG WARNING NE WY AND BLACK HILLS.

MURPHY

c

In the hours before

Local storm report, Aug 11, 6:59 PM MDT, 3 hours 18 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RAPID CITY SD
659 PM MDT FRI AUG 11 2000

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

0617 PM    10 SE HEREFORD            SD   60 MPH TSTM GUST
08/11/00   MEADE                          REPORTED BY STORM
                                          SPOTTER.

Bunkers
N

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 11, 6:14 PM MDT	Severe Thunderstorm Warning	UNR	Meade, Pennington	46 min
Aug 11, 9:10 PM MDT	Severe Thunderstorm Warning	UNR	Harding	50 min
Aug 11, 10:00 PM MDT	Severe Thunderstorm Warning	UNR	Harding	60 min
Aug 11, 10:24 PM MDT	Tornado Warning	UNR	Fall River	66 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 2000 Every severe thunderstorm warning in 2000

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; radar from the NEXRAD Level II archive.