Alert archive / South Dakota / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 233, NWS Aberdeen, SD

September 19, 20185 counties in South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Sep 19, 2018, 4:01 AM CDT for 5 counties in 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: Sep 19, 2018, 4:01 AM CDT (09:01 UTC)
Expired: Sep 19, 2018, 5:00 AM CDT
In force: 59 min
Issued by: NWS Aberdeen, SD
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Faulk County, SD, Hand County, SD, Hyde County, SD, Potter County, SD, Sully County, SD

The radar

The Aberdeen radar (KABR), 116 km from the middle of the area, began a volume at 09:03 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

Bismarck Municip, ND (KBIS), launched 00:00Z, 9.0 hours before the alert went out and 238 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1699 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: -54 m²/s²
0-3 km storm-relative helicity: 158 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 Sep 19, 3:03 AM CDT, 58 minutes earlier.

Area forecast discussion, Sep 19, 3:03 AM CDT, 58 minutes before

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Hazardous weather outlook, Sep 18, 4:02 AM CDT, 23 hours 59 minutes before

Hazardous Weather Outlook
National Weather Service Aberdeen SD
402 AM CDT Tue Sep 18 2018

MNZ039-046-SDZ003>011-015>023-033>037-045-048-051-190915-
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-
402 AM CDT Tue Sep 18 2018 /302 AM MDT Tue Sep 18 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.

Isolated showers and thunderstorms are possible today, but with an
uptick in coverage tonight. The threat of severe weather looks
minimal at this time. Therefore, lightning is the main threat.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

Scattered showers and storms are expected for the middle and late
part of the work week. There is a marginal risk of severe weather on
Wednesday and Wednesday night, mainly over eastern and south parts of
the forecast area.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

In the hours before

Special weather statement, Sep 19, 2:12 AM CDT, 1 hour 49 minutes before

Special Weather Statement
National Weather Service Aberdeen SD
112 AM MDT WED SEP 19 2018

SDZ015-190800-
Dewey SD-
112 AM MDT WED SEP 19 2018

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN DEWEY COUNTY UNTIL
200 AM MDT...

At 112 AM MDT, Doppler radar was tracking a strong thunderstorm 8
miles east of Thunder Butte, or 11 miles north of Dupree, moving east
at 55 mph.

Nickel size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Isabel, Little Moreau Rec Area, White Horse, Bear Creek, Ridgeview
and Green Grass.

LAT...LON 4538 10149 4539 10147 4540 10147 4542 10075
      4503 10075 4506 10148
TIME...MOT...LOC 0712Z 273DEG 49KT 4521 10151

TDK

Special weather statement, Sep 19, 3:11 AM CDT, 50 minutes before

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Special weather statement, Sep 19, 3:23 AM CDT, 38 minutes before

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Special weather statement, Sep 19, 3:42 AM CDT, 19 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
Sep 19, 2:12 AM CDT	Special Weather Statement	ABR	Dewey	48 min
Sep 19, 2:30 AM CDT	Severe Thunderstorm Warning	ABR	Dewey, Walworth	60 min
Sep 19, 3:11 AM CDT	Special Weather Statement	ABR	Brule	19 min
Sep 19, 3:23 AM CDT	Special Weather Statement	ABR	Potter	67 min
Sep 19, 3:42 AM CDT	Special Weather Statement	ABR	Spink	48 min
Sep 19, 4:13 AM CDT	Special Weather Statement	ABR	Spink	47 min
Sep 19, 5:06 AM CDT	Special Weather Statement	ABR	Codington	39 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.