Alert archive / South Dakota / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 21, NWS Rapid City, SD

June 11, 1997Mellette County, South Dakota

NWS Rapid City, SD issued this severe thunderstorm warning at Jun 11, 1997, 3:02 PM CDT for Mellette County, South Dakota. It was in force for 63 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 11, 1997, 3:02 PM CDT (20:02 UTC)
Expired: Jun 11, 1997, 4:05 PM CDT
In force: 63 min
Issued by: NWS Rapid City, SD
Area: Whole counties

County Mellette County, SD

The radar

The Rapid City radar (KUDX), 177 km from the middle of the area, began a volume at 20:08 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
Jun 11, 3:25 PM CDT	Hail 1.75	White River, 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

Rapid City, SD (KUNR), launched 12:00Z, 8.0 hours before the alert went out and 179 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: 9 J/kg
Mixed-layer CIN: -120 J/kg
Mixed-layer LCL: 896 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 23 m²/s²
0-3 km storm-relative helicity: 49 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KRAP 112005 RRA
SVRRAP
SDC095-112105-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE RAPID CITY SD
202 PM MDT WED JUN 11 1997

* SEVERE THUNDERSTORM WARNING FOR
  MELLETTE COUNTY - SOUTH CENTRAL SOUTH DAKOTA

* UNTIL 305 PM MDT
 
* SOME LOCATIONS AFFECTED
  WHITE RIVER
  CEDAR BUTTE

* AT 200 PM MDT DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM WITH
  GOLFBALL SIZE HAIL AND HEAVY RAIN WHITE RIVER OR 20 MILES NORTH OF(
  MISSION. THE STORM WAS NEARLY STATIONARY.
 
LARGE HAIL CAN INJURE YOU. IF YOU ARE OUTSIDE...QUICKLY GET TO A
STRONG BUILDING AWAY FROM WINDOWS. DO NOT RISK SERIOUS INJURY BY
TRYING TO PROTECT PROPERTY.

MMF/BK

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 11, 12:41 PM CDT, 2 hours 21 minutes earlier.

Area forecast discussion, Jun 11, 12:41 PM CDT, 2 hours 21 minutes before

AREA FORECAST DISCUSSION FOR WESTERN SOUTH DAKOTA AND NE WYOMING
NATIONAL WEATHER SERVICE RAPID CITY SD
1145 AM MST WED JUN 11 1997

HAVE UPDATED MOST ZONES TO CLEANUP MORNING WORDING AND FINE TUNE.
QUASI-lSTATIONARY STORMS OVER PERKINS HAVE WARRANTED FFW FOR THAT
AREA. CLEAR AREA AND SUBSEQUENT HEATING OVR SW SD HAS INCREASED
CONVECTION TO NEAR SVR LEVELS OVR SRN HILLS.

.UNR...NONE.
BAILEY

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 11, 12:05 PM CDT	Flash Flood Warning	UNR	Perkins, Ziebach	6 hr
Jun 11, 1:36 PM CDT	Severe Thunderstorm Warning	UNR		44 min
Jun 11, 2:20 PM CDT	Severe Thunderstorm Warning	UNR		45 min
Jun 11, 2:29 PM CDT	Tornado Warning	UNR	Mellette	31 min
Jun 11, 2:35 PM CDT	Severe Thunderstorm Warning	UNR	Bennett	45 min
Jun 11, 3:16 PM CDT	Severe Thunderstorm Warning	UNR	Pennington	49 min
Jun 11, 4:00 PM CDT	Severe Thunderstorm Warning	UNR	Mellette	45 min
Jun 11, 4:28 PM CDT	Severe Thunderstorm Warning	UNR	Todd	47 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 1997 Every severe thunderstorm warning in 1997

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.