Alert archive / South Dakota / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 203, NWS Aberdeen, SD

August 26, 2018Brown County, Marshall County, South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Aug 26, 2018, 8:46 AM CDT for Brown County, Marshall County, South Dakota. It was in force for 59 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 26, 2018, 8:46 AM CDT (13:46 UTC)
Expired: Aug 26, 2018, 9:45 AM CDT
In force: 59 min
Issued by: NWS Aberdeen, SD
Area: Storm-based polygon
Hail: 1.25 in
Wind: 50.0 mph

Counties Brown County, SD, Marshall County, SD

The radar

The Aberdeen radar (KABR), 42 km from the middle of the area, began a volume at 13:45 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, 1.8 hours before the alert went out and 92 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: 170 J/kg
Mixed-layer CIN: -494 J/kg
Mixed-layer LCL: 1682 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 220 m²/s²
0-3 km storm-relative helicity: 249 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 26, 6:44 AM CDT, 2 hours 2 minutes earlier.

Area forecast discussion, Aug 26, 6:44 AM CDT, 2 hours 2 minutes before

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Hazardous weather outlook, Aug 26, 5:10 AM CDT, 3 hours 36 minutes before

Hazardous Weather Outlook
National Weather Service Aberdeen SD
510 AM CDT Sun Aug 26 2018

MNZ039-046-SDZ003>011-015>023-033>037-045-048-051-271015-
Traverse-Big Stone-Corson-Campbell-McPherson-Brown-Marshall-Roberts-
Walworth-Edmunds-Day-Dewey-Potter-Faulk-Spink-Clark-Codington-Grant-
Hamlin-Deuel-Stanley-Sully-Hughes-Hyde-Hand-Jones-Lyman-Buffalo-
510 AM CDT Sun Aug 26 2018 /410 AM MDT Sun Aug 26 2018/

This Hazardous Weather Outlook is for west central Minnesota,
central South Dakota, north central South Dakota and northeast
South Dakota.

.DAY ONE...Today and tonight.

Throughout the day today and tonight, isolated to scattered strong to
severe thunderstorms are possible. The main severe weather threats
include large hail, damaging winds and torrential rainfall.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Thunderstorms are possible Monday afternoon through Monday night, and
then again, at times, late in the week and over the weekend.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be requested. Weather spotters are encouraged
to submit reports to the National Weather Service in Aberdeen. The
public can submit reports on our web page, Facebook page, or our
Twitter feed.

Dorn

In the hours before

Special weather statement, Aug 26, 6:59 AM CDT, 1 hour 47 minutes before

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Special weather statement, Aug 26, 7:43 AM CDT, 1 hour 3 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
Aug 25, 8:09 PM CDT	Special Weather Statement	ABR	Jones	51 min
Aug 25, 8:55 PM CDT	Special Weather Statement	ABR	Jones, Lyman	50 min
Aug 25, 10:20 PM CDT	Severe Thunderstorm Warning	ABR	Buffalo, Hand, Hughes, Hyde, Lyman	25 min
Aug 25, 10:45 PM CDT	Special Weather Statement	ABR	Hand	45 min
Aug 26, 5:19 AM CDT	Severe Thunderstorm Warning	ABR	Corson, Dewey	56 min
Aug 26, 6:15 AM CDT	Severe Thunderstorm Warning	ABR	Corson, Dewey, Walworth	45 min
Aug 26, 6:59 AM CDT	Special Weather Statement	ABR	Walworth	46 min
Aug 26, 7:43 AM CDT	Special Weather Statement	ABR	McPherson	47 min
Aug 26, 8:07 AM CDT	Severe Thunderstorm Warning	ABR	Brown, McPherson	38 min
Aug 26, 9:42 AM CDT	Special Weather Statement	ABR	Marshall	18 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 2018 Every severe thunderstorm warning in 2018

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.