Alert archive / South Dakota / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 145, NWS Aberdeen, SD

July 20, 1997Day County, South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Jul 20, 1997, 4:13 AM CDT for Day County, South Dakota. It was in force for 62 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 20, 1997, 4:13 AM CDT (09:13 UTC)
Expired: Jul 20, 1997, 5:15 AM CDT
In force: 62 min
Issued by: NWS Aberdeen, SD
Area: Whole counties

County Day County, SD

The radar

The Aberdeen radar (KABR), 64 km from the middle of the area, began a volume at 09:13 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 20, 5:10 AM CDT	Thunderstorm Wind 52	Webster, 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 00:00Z, 9.2 hours before the alert went out and 81 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: 2323 J/kg
Mixed-layer CIN: -48 J/kg
Mixed-layer LCL: 1325 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 41 m²/s²
0-3 km storm-relative helicity: 84 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 3.7

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 19, 9:05 PM CDT, 7 hours 8 minutes earlier.

Area forecast discussion, Jul 19, 9:05 PM CDT, 7 hours 8 minutes before

AREA FORECAST DISCUSSION FOR CENTRAL/NORTH CENTRAL/NORTHEAST SD
AND FOR TRAVERSE/BIG STONE COUNTIES OF MN
NATIONAL WEATHER SERVICE ABERDEEN SD
903 PM CDT SAT JUL 19 1997

BEST CHANCES OF TSRAS LATE THIS EVENING HAVE MOVED SOUTH OF
MOBRIDGE...ABERDEEN...GETTYSBURG AS NORTH TO NORTHEAST WINDS PUSH IN
SOME DRIER AND COOLER AIR. AREA OF -SHRAS ACROSS NC SD WILL BE ENDING
BY MIDNIGHT. LEFT CHANCES IN AREAS WHERE OUTFLOW BNDRY AND COOL FRONT
STILL MAY KICK OFF SOME TSRAS FROM PIERRE THROUGH WATERTOWN TO WHEATON.
ALSO MADE ADJ TO WIND FORECAST.

.ABR...NONE

DM

In the hours before

Local storm report, Jul 19, 11:18 PM CDT, 4 hours 55 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 19, 9:26 PM CDT	Severe Thunderstorm Warning	ABR	Roberts	49 min
Jul 19, 9:30 PM CDT	Severe Thunderstorm Warning	ABR	Grant, Roberts	45 min
Jul 19, 9:42 PM CDT	Tornado Warning	ABR	Grant	33 min
Jul 20, 2:22 AM CDT	Severe Thunderstorm Warning	ABR	Hand	48 min
Jul 20, 3:31 AM CDT	Severe Thunderstorm Warning	ABR	Spink	49 min
Jul 20, 5:27 AM CDT	Severe Thunderstorm Warning	ABR	Roberts	63 min
Jul 19, 8:55 PM CDT	Severe Thunderstorm Warning	ABR	Big Stone	65 min
Jul 20, 5:58 AM CDT	Severe Thunderstorm Warning	ABR	Big Stone, Traverse	62 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.