Alert archive / South Dakota / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 163, NWS Aberdeen, SD

July 25, 1997Spink County, South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Jul 25, 1997, 8:21 PM CDT for Spink County, South Dakota. It was in force for 59 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 25, 1997, 8:21 PM CDT (01:21 UTC)
Expired: Jul 25, 1997, 9:20 PM CDT
In force: 59 min
Issued by: NWS Aberdeen, SD
Area: Whole counties

County Spink County, SD

The radar

The Aberdeen radar (KABR), 58 km from the middle of the area, began a volume at 01:21 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 25, 8:30 PM CDT	Thunderstorm Wind 61	Turton, 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 watch it was issued in

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

Issued	Product	Office	Lasted
Jul 25, 6:00 PM CDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 1.4 hours before the alert went out and 6 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: 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

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 Aberdeen, SD wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 25, 10:40 AM CDT, 9 hours 41 minutes earlier.

Area forecast discussion, Jul 25, 10:40 AM CDT, 9 hours 41 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, 7:15 PM CDT	Tornado Warning	ABR	Marshall	50 min
Jul 25, 7:25 PM CDT	Severe Thunderstorm Warning	ABR	Corson, Dewey	65 min
Jul 25, 7:31 PM CDT	Tornado Warning	ABR	Brown, Spink	49 min
Jul 25, 7:59 PM CDT	Tornado Warning	ABR	Dewey	61 min
Jul 25, 8:26 PM CDT	Tornado Warning	ABR	Spink	64 min
Jul 25, 8:43 PM CDT	Severe Thunderstorm Warning	ABR	Clark	62 min
Jul 25, 8:52 PM CDT	Severe Thunderstorm Warning	ABR	Potter	63 min
Jul 25, 9:43 PM CDT	Severe Thunderstorm Warning	ABR	Hamlin	47 min
Jul 26, 5:03 AM CDT	Severe Thunderstorm Warning	ABR	Dewey	32 min
Jul 26, 5:22 AM CDT	Severe Thunderstorm Warning	ABR	Potter, Sully	63 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.