Alert archive / South Dakota / Tornado Warnings in 1997

Tornado Warning 34, NWS Aberdeen, SD

July 25, 1997Dewey County, South Dakota

NWS Aberdeen, SD issued this tornado warning at Jul 25, 1997, 6:59 PM MDT for Dewey County, South Dakota. It was in force for 61 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, 6:59 PM MDT (00:59 UTC)
Expired: Jul 25, 1997, 8:00 PM MDT
In force: 61 min
Issued by: NWS Aberdeen, SD
Area: Whole counties

County Dewey County, SD

The radar

The Bismarck radar (KBIS), 180 km from the middle of the area, began a volume at 00:59 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

Bismarck Municip, ND (KBIS), launched 00:00Z, 1.0 hours before the alert went out and 180 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: 1406 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 1360 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 13 m²/s²
0-3 km storm-relative helicity: 109 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 3.2

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KABR 260100 RRA
TORABR
SDC041-260200-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE ABERDEEN SD
759 PM CDT FRI JUL 25 1997

* TORNADO WARNING FOR
  NORTH CENTRAL AND NORTHEAST DEWEY COUNTY - NORTH CENTRAL SOUTH
  DAKOTA

* UNTIL 800 PM MDT (900 PM CDT)
 
* SOME LOCATIONS AFFECTED
  THE STORM WILL REMAIN OVER RURAL AREAS

* AT 656 PM MDT...ABERDEEN DOPPLER RADAR INDICATED A TORNADO 23
  MILES SOUTHWEST OF MOBRIDGE OR 6 MILES SOUTHEAST OF GLENCROSS
  MOVING EAST AT 35 MPH.


 THIS REPLACES THE SEVERE THUNDERSTORM WARNING FOR DEWEY COUNTY
GO TO THE BASEMENT OR A SMALL INTERIOR ROOM ON THE LOWEST FLOOR!

CB/DEE

What forecasters said that day

The local office's own words before this tornado warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Aberdeen, SD wrote its last area forecast discussion before this tornado warning went out at Jul 25, 9:40 AM MDT, 9 hours 19 minutes earlier.

Area forecast discussion, Jul 25, 9:40 AM MDT, 9 hours 19 minutes before

AREA FORECAST DISCUSSION FOR CENTRAL/NORTH CENTRAL/NORTHEAST SD
AND FOR TRAVERSE/BIG STONE COUNTIES OF MN
NATIONAL WEATHER SERVICE ABERDEEN SD
1040 AM CDT FRI JUL 25 1997

HAVE UPDATED ZONE PACKAGE TO REMOVE MORNING WEATHER. ALSO UPPED HIGHS
IN CENTRAL ZONES AROUND PIR. WEAK PRESSURE GRADIENTS AT SFC UP TO 850 MB
...SO WILL FCST VARIABLE WINDS OVER ENTIRE CWA.

.ABR...NONE

MIDDLEBROOKE

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 25, 6:15 PM MDT	Tornado Warning	ABR	Marshall	50 min
Jul 25, 6:25 PM MDT	Severe Thunderstorm Warning	ABR	Corson, Dewey	65 min
Jul 25, 6:31 PM MDT	Tornado Warning	ABR	Brown, Spink	49 min
Jul 25, 7:21 PM MDT	Severe Thunderstorm Warning	ABR	Spink	59 min
Jul 25, 7:26 PM MDT	Tornado Warning	ABR	Spink	64 min
Jul 25, 7:43 PM MDT	Severe Thunderstorm Warning	ABR	Clark	62 min
Jul 25, 7:52 PM MDT	Severe Thunderstorm Warning	ABR	Potter	63 min
Jul 25, 8:43 PM MDT	Severe Thunderstorm Warning	ABR	Hamlin	47 min
Jul 26, 4:03 AM MDT	Severe Thunderstorm Warning	ABR	Dewey	32 min
Jul 26, 4:22 AM MDT	Severe Thunderstorm Warning	ABR	Potter, Sully	63 min

Nearby

Tornado Warnings in South Dakota, 1997 Every tornado warning in 1997 Tornadoes 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.