Alert archive / South Dakota / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 79, NWS Aberdeen, SD

July 17, 2019Dewey County, Potter County, South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Jul 17, 2019, 9:32 PM MDT for Dewey County, Potter County, South Dakota. It was in force for 28 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 17, 2019, 9:32 PM MDT (03:32 UTC)
Expired: Jul 17, 2019, 10:00 PM MDT
In force: 28 min
Issued by: NWS Aberdeen, SD
Area: Storm-based polygon
Tornado: Possible
Hail: 1.0 in
Wind: 60.0 mph

Counties Dewey County, SD, Potter County, SD

The radar

The Aberdeen radar (KABR), 161 km from the middle of the area, began a volume at 03:33 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.

Issued	Product	Office	Lasted
Jul 17, 4:38 PM MDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 00:00Z, 3.5 hours before the alert went out and 186 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: 281 J/kg
Mixed-layer CIN: -56 J/kg
Mixed-layer LCL: 1963 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: -1 m²/s²
0-3 km storm-relative helicity: 61 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

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 17, 8:15 PM MDT, 1 hour 17 minutes earlier.

Area forecast discussion, Jul 17, 8:15 PM MDT, 1 hour 17 minutes before

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In the hours before

Special weather statement, Jul 17, 9:22 PM MDT, 10 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 17, 9:22 PM MDT	Special Weather Statement	ABR	Dewey, Hughes, Stanley, Sully	38 min
Jul 17, 9:52 PM MDT	Severe Thunderstorm Warning	ABR	Hughes, Stanley	38 min
Jul 17, 9:57 PM MDT	Severe Thunderstorm Warning	ABR	Dewey, Potter, Walworth	48 min
Jul 17, 10:23 PM MDT	Severe Thunderstorm Warning	ABR	Buffalo, Hughes, Hyde, Lyman, Stanley	26 min
Jul 17, 10:54 PM MDT	Special Weather Statement	ABR	Faulk	51 min
Jul 17, 10:56 PM MDT	Special Weather Statement	ABR	Faulk	49 min
Jul 17, 11:23 PM MDT	Special Weather Statement	ABR	Faulk	37 min
Jul 17, 11:47 PM MDT	Special Weather Statement	ABR	Brown	28 min
Jul 17, 11:51 PM MDT	Severe Thunderstorm Warning	ABR	Brown	24 min
Jul 17, 11:59 PM MDT	Special Weather Statement	ABR	Day	31 min
Jul 18, 12:18 AM MDT	Special Weather Statement	ABR	Brown, Day, Marshall	42 min
Jul 18, 1:22 AM MDT	Special Weather Statement	ABR	Roberts	38 min
Jul 18, 1:51 AM MDT	Special Weather Statement	ABR	Roberts	39 min
Jul 18, 5:32 AM MDT	Special Weather Statement	ABR	Hughes	28 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 2019 Every severe thunderstorm warning in 2019

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.