Alert archive / South Dakota / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 185, NWS Aberdeen, SD

August 5, 1997Roberts County, South Dakota; Traverse County, Minnesota

NWS Aberdeen, SD issued this severe thunderstorm warning at Aug 5, 1997, 8:54 PM CDT for Roberts County, South Dakota; Traverse County, Minnesota. It was in force for 76 min. 2 reports 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: Aug 5, 1997, 8:54 PM CDT (01:54 UTC)
Expired: Aug 5, 1997, 10:10 PM CDT
In force: 76 min
Issued by: NWS Aberdeen, SD
Area: Whole counties

Counties Traverse County, MN, Roberts County, SD

The radar

The Aberdeen radar (KABR), 135 km from the middle of the area, began a volume at 01:53 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
Aug 5, 8:57 PM CDT	Thunderstorm Wind 52	Rosholt, SD	Strong thunderstorm winds flattened an old granary and unrolled large round bales. Many trees in the area were uprooted and twisted. Also, wind driven hail stripped corn and bashed beans.
Aug 5, 9:23 PM CDT	Thunderstorm Wind 52	Browns Vly, MN	Strong thunderstorm winds knocked a tree down along with several other branches.

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
Aug 5, 8:45 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 1.9 hours before the alert went out and 159 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: 39 J/kg
Mixed-layer CIN: -162 J/kg
Mixed-layer LCL: 1797 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 14 m²/s²
0-3 km storm-relative helicity: 107 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Aug 5, 10:32 AM CDT, 10 hours 22 minutes earlier.

Area forecast discussion, Aug 5, 10:32 AM CDT, 10 hours 22 minutes before

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In the hours before

Local storm report, Aug 5, 3:31 PM CDT, 5 hours 23 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE  ABERDEEN SD
331 PM CDT TUE AUG 5 1997

TIME(CDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0700 PM    10 W AGAR                 SD   0.75 INCH HAIL
08/03/97   SULLY

0655 PM    POLO                      SD   1.00 INCH HAIL
08/03/97   HAND

HG

Local storm report, Aug 5, 3:32 PM CDT, 5 hours 22 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE  ABERDEEN SD
332 PM CDT TUE AUG 5 1997

TIME(CDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0700 PM    10 W AGAR                 SD   0.75 INCH HAIL
08/03/97   SULLY

0655 PM    POLO                      SD   1.00 INCH HAIL
08/03/97   HAND

HG

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 5, 8:54 PM CDT	Tornado Warning	ABR	Roberts	76 min
Aug 5, 9:58 PM CDT	Severe Thunderstorm Warning	ABR	Grant	47 min
Aug 5, 9:44 PM CDT	Severe Thunderstorm Warning	ABR	Big Stone	61 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 1997 Severe Thunderstorm Warnings in Minnesota, 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.