Alert archive / South Dakota / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 98, NWS Sioux Falls, SD

July 27, 1997Charles Mix County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 27, 1997, 8:02 AM CDT for Charles Mix County, South Dakota. It was in force for 33 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: Jul 27, 1997, 8:02 AM CDT (13:02 UTC)
Expired: Jul 27, 1997, 8:35 AM CDT
In force: 33 min
Issued by: NWS Sioux Falls, SD
Area: Whole counties

County Charles Mix County, SD

The radar

The Sioux Falls radar (KFSD), 156 km from the middle of the area, began a volume at 13:05 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
Jul 27, 8:15 AM CDT	Hail 0.75	Ravinia, 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, 1.0 hours before the alert went out and 189 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: 903 J/kg
Mixed-layer CIN: -81 J/kg
Mixed-layer LCL: 1109 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 46 m²/s²
0-3 km storm-relative helicity: 54 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KFSD 271303 RRA
SVRFSD
SDC023-271335-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
802 AM CDT SUN JUL 27 1997

* SEVERE THUNDERSTORM WARNING FOR
  CHARLES MIX COUNTY IN SOUTHEASTERN SOUTH DAKOTA

* UNTIL 835 AM CDT
 
* SOME AREAS AFFECTED
  WAGNER                   AROUND 815 AM CDT
  DANTE                    AROUND 830 AM CDT

* AT 800 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  A SEV6ERE THUNDERSTORM IN THE VICINITY OF LAKE ANDES  MOVING EAST
  AT 30 MPH.
 
SOME OF THESE STORMS MAY CONTAIN SMALL HAIL...GUSTY WINDS...DEADLY
LIGHTNING AND VERY HEAVY DOWNPOURS OF RAIN.

UMLAND

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 Sioux Falls, SD wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 26, 9:15 PM CDT, 10 hours 47 minutes earlier.

Area forecast discussion, Jul 26, 9:15 PM CDT, 10 hours 47 minutes before

AREA FORECAST DISCUSSION FOR SOUTHEAST SD/SOUTHWEST MN/NORTHWEST IA
NATIONAL WEATHER SERVICE SIOUX FALLS SD
915 PM CDT SAT JUL 26 1997

CURNT FCST LOOKS GOOD FOR NOW WITH 30 PCT POP. XCP FOR STG CELL DVLPD
JUST NE OF FSD THERE HASNT BEEN ANYTHNG BUT EXPCT MORE DVLPMNT LATR
TNGT. WILL WATCH STG CELL AS IT CUD GROW INTO DECNT SYS IF IT INTERACTS
WITH APPCHG BOUNDRY. OTRW DVLPMNT PSBL ANYWHERE LATR...PSBLY WITH ACTVTY
DVLPG FRTHR W AND MOVG INTO AREA. TEMPS/LGT WNDS LOOK GOOD. WILL GO WITH
NOWS AND STATEMNTS OR WRNGS IOF NEEDED BUT ZNS LOOK GOOD FOR NOW.

.FSD...NONE
WILLIAMS

The office that day

Everything else NWS Sioux Falls, SD issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 27, 7:24 AM CDT	Severe Thunderstorm Warning	FSD	Gregory	46 min
Jul 27, 8:09 AM CDT	Severe Thunderstorm Warning	FSD	Douglas, Hutchinson	51 min
Jul 27, 9:00 AM CDT	Severe Thunderstorm Warning	FSD	Hutchinson, Yankton	45 min
Jul 27, 9:12 AM CDT	Severe Thunderstorm Warning	FSD	Bon Homme	33 min
Jul 27, 9:32 AM CDT	Severe Thunderstorm Warning	FSD	Yankton	43 min
Jul 27, 9:48 AM CDT	Severe Thunderstorm Warning	FSD	Clay	47 min
Jul 27, 9:57 AM CDT	Severe Thunderstorm Warning	FSD	Turner	33 min
Jul 27, 10:21 AM CDT	Severe Thunderstorm Warning	FSD	Union	44 min
Jul 27, 10:37 AM CDT	Severe Thunderstorm Warning	FSD	Clay	33 min
Jul 27, 11:02 AM CDT	Tornado Warning	FSD	Union	33 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.