Alert archive / South Dakota / Tornado Warnings in 1997

Tornado Warning 14, NWS Sioux Falls, SD

July 25, 1997Lake County, South Dakota

NWS Sioux Falls, SD issued this tornado warning at Jul 25, 1997, 11:32 PM CDT for Lake County, South Dakota. It was in force for 48 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
Jul 25, 1997, 11:32 PM CDT (04:32 UTC)
Expired
Jul 26, 1997, 12:20 AM CDT
In force
48 min
Issued by
NWS Sioux Falls, SD
Area
Whole counties

County Lake County, SD

The radar

The Sioux Falls radar (KFSD), 58 km from the middle of the area, began a volume at 04:34 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 watch it was issued in

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

IssuedProductOfficeLasted
Jul 25, 11:00 PM CDTSevere Thunderstorm WatchSPC4 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 4.5 hours before the alert went out and 140 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, Aberdeen, SD at 00:00Z on 1997-07-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3331 joules per kilogram.LCLEL10008507005003002001001 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, Aberdeen, SD at 00:00Z on 1997-07-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 27 square meters per square second.19395878Sfc1 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
3331 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
1007 m above ground
0-6 km bulk shear
54 kt
0-1 km storm-relative helicity
27 m²/s²
0-3 km storm-relative helicity
68 m²/s²
Significant tornado parameter
1.2
Supercell composite
4.3

Open this sounding in Storm Lab

The text

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

869 
WFUS1 KFSD 260433 RRA
TORFSD
SDC079-260520-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1132 PM CDT FRI JUL 25 1997

* TORNADO WARNING FOR
  LAKE COUNTY IN EASTCENTRAL SOUTH DAKOTA

* UNTIL 1220 AM CDT
 
* SOME AREAS AFFECTED
  RUTLAND                  AROUND 1135 PM CDT
  WENTWORTH                AROUND 1140 PM CDT
  CHESTER                  AROUND 1150 PM CDT

* AT 1130 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  A TORNADO 23 MILES SOUTHWEST OF BROOKINGS  OR 8 MILES WEST OF
  RUTLAND MOVING SOUTHEAST AT 35 MPH.
 
IF YOU ARE IN THE PATH OF A TORNADO...THE SAFEST PLACE IN A HOME OR
BUSINESS IS AN INTERIOR ROOM ON THE LOWEST FLOOR POSSIBLE.  AVOID
WINDOWS.

BLOOM

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 25, 9:54 PM CDTSevere Thunderstorm WarningFSDKingsbury46 min
Jul 25, 10:13 PM CDTSevere Thunderstorm WarningFSDKingsbury47 min
Jul 25, 10:45 PM CDTSevere Thunderstorm WarningFSDBrookings50 min
Jul 25, 11:03 PM CDTSevere Thunderstorm WarningFSDKingsbury, Lake47 min

Nearby

Tornado Warnings in South Dakota, 1997Every tornado warning in 1997Tornadoes 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.