Alert archive / South Dakota / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 119, NWS Aberdeen, SD

July 21, 2004Codington County, Deuel County, Hamlin County, South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Jul 21, 2004, 5:40 PM CDT for Codington County, Deuel County, Hamlin County, South Dakota. It was in force for 50 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 21, 2004, 5:40 PM CDT (22:40 UTC)
Expired: Jul 21, 2004, 6:30 PM CDT
In force: 50 min
Issued by: NWS Aberdeen, SD
Area: Counties, with a storm outline in the text

Counties Codington County, SD, Deuel County, SD, Hamlin County, SD

The radar

The Aberdeen radar (KABR), 131 km from the middle of the area, began a volume at 22:43 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 21, 1:50 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 10.7 hours before the alert went out and 110 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: 220 J/kg
Mixed-layer CIN: -217 J/kg
Mixed-layer LCL: 1834 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: -20 m²/s²
0-3 km storm-relative helicity: -6 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

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 21, 3:45 PM CDT, 1 hour 55 minutes earlier.

Area forecast discussion, Jul 21, 3:45 PM CDT, 1 hour 55 minutes before

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Hazardous weather outlook, Jul 21, 12:14 PM CDT, 5 hours 26 minutes before

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In the hours before

Local storm report, Jul 21, 3:04 PM CDT, 2 hours 36 minutes before

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Special weather statement, Jul 21, 3:39 PM CDT, 2 hours 1 minute before

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Local storm report, Jul 21, 3:43 PM CDT, 1 hour 57 minutes before

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Local storm report, Jul 21, 4:17 PM CDT, 1 hour 23 minutes before

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Special weather statement, Jul 21, 5:29 PM CDT, 11 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 20, 8:31 PM CDT	Severe Thunderstorm Warning	ABR	Dewey, Potter, Walworth	44 min
Jul 20, 9:08 PM CDT	Severe Thunderstorm Warning	ABR	Campbell, McPherson	67 min
Jul 20, 9:13 PM CDT	Severe Thunderstorm Warning	ABR	Walworth	32 min
Jul 20, 9:44 PM CDT	Severe Thunderstorm Warning	ABR	Faulk, Potter	46 min
Jul 20, 9:58 PM CDT	Severe Thunderstorm Warning	ABR	Hyde, Sully	32 min
Jul 20, 10:10 PM CDT	Severe Thunderstorm Warning	ABR	Deuel	50 min
Jul 20, 10:36 PM CDT	Severe Thunderstorm Warning	ABR	Hughes	24 min
Jul 20, 11:03 PM CDT	Severe Thunderstorm Warning	ABR	Brown	27 min
Jul 20, 11:28 PM CDT	Severe Thunderstorm Warning	ABR	Brown	47 min
Jul 20, 11:57 PM CDT	Severe Thunderstorm Warning	ABR	Clark, Day	33 min
Jul 21, 2:52 PM CDT	Severe Thunderstorm Warning	ABR	Marshall	23 min
Jul 21, 3:17 PM CDT	Severe Thunderstorm Warning	ABR	Brown	28 min
Jul 21, 3:45 PM CDT	Severe Thunderstorm Warning	ABR	Brown, Day	60 min
Jul 21, 5:31 PM CDT	Severe Thunderstorm Warning	ABR	Clark	29 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 2004 Every severe thunderstorm warning in 2004

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.