Alert archive / South Dakota / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 143, NWS Aberdeen, SD

August 1, 2017Dewey County, Sully County, South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Aug 1, 2017, 9:07 AM MDT for Dewey County, Sully County, South Dakota. It was in force for 24 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
Aug 1, 2017, 9:07 AM MDT (15:07 UTC)
Expired
Aug 1, 2017, 9:31 AM MDT
In force
24 min
Issued by
NWS Aberdeen, SD
Area
Storm-based polygon
Hail
1.0 in
Wind
50.0 mph

Counties Dewey County, SD, Sully County, SD

The radar

The Aberdeen radar (KABR), 174 km from the middle of the area, began a volume at 15:10 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 nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 3.1 hours before the alert went out and 166 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-pSkew-T log-p diagram, Aberdeen, SD at 12:00Z on 2017-08-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 992 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Aberdeen, SD at 12:00Z on 2017-08-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 2 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
992 J/kg
Mixed-layer CIN
-200 J/kg
Mixed-layer LCL
1296 m above ground
0-6 km bulk shear
16 kt
0-1 km storm-relative helicity
2 m²/s²
0-3 km storm-relative helicity
24 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 Aug 1, 5:27 AM MDT, 3 hours 40 minutes earlier.

Area forecast discussion, Aug 1, 5:27 AM MDT, 3 hours 40 minutes before
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Hazardous weather outlook, Aug 1, 3:41 AM MDT, 5 hours 26 minutes before
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In the hours before

Special weather statement, Aug 1, 5:42 AM MDT, 3 hours 25 minutes before
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Special weather statement, Aug 1, 8:59 AM MDT, 8 minutes before
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        The site you requested is temporarily down for maintenance or an unexpected outage.
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The office that day

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

IssuedProductOfficeCountiesLasted
Aug 1, 5:42 AM MDTSpecial Weather StatementABRCorson48 min
Aug 1, 8:59 AM MDTSpecial Weather StatementABRSully46 min
Aug 1, 9:36 AM MDTSpecial Weather StatementABRStanley24 min
Aug 1, 11:32 AM MDTSpecial Weather StatementABRBuffalo, Lyman43 min
Aug 1, 12:17 PM MDTSpecial Weather StatementABRBuffalo28 min
Jul 31, 10:44 PM MDTSpecial Weather StatementABRTraverse46 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 2017Every severe thunderstorm warning in 2017

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.