Alert archive / South Dakota / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 2, NWS Aberdeen, SD

April 6, 2020Brown County, Marshall County, South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Apr 6, 2020, 9:14 PM CDT for Brown County, Marshall County, South Dakota. It was in force for 46 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
Apr 6, 2020, 9:14 PM CDT (02:14 UTC)
Expired
Apr 6, 2020, 10:00 PM CDT
In force
46 min
Issued by
NWS Aberdeen, SD
Area
Storm-based polygon
Hail
1.0 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 02:17 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 00:00Z, 2.2 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-pSkew-T log-p diagram, Aberdeen, SD at 00:00Z on 2020-04-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 258 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 00:00Z on 2020-04-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 154 square meters per square second.1939587897Sfc1 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
258 J/kg
Mixed-layer CIN
-217 J/kg
Mixed-layer LCL
1487 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
154 m²/s²
0-3 km storm-relative helicity
211 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.5

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 Apr 6, 6:19 PM CDT, 2 hours 55 minutes earlier.

Area forecast discussion, Apr 6, 6:19 PM CDT, 2 hours 55 minutes before
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Hazardous weather outlook, Apr 6, 3:00 PM CDT, 6 hours 14 minutes before
Hazardous Weather Outlook
National Weather Service Aberdeen SD
300 PM CDT Mon Apr 6 2020

MNZ039-046-SDZ003>011-015>023-033>037-045-048-051-072000-
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-
300 PM CDT Mon Apr 6 2020 /200 PM MDT Mon Apr 6 2020/

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

.DAY ONE...This afternoon and tonight.

An isolated shower or thunderstorm is possible this evening and
tonight. Gusty winds and some hail could accompany thunderstorms this
evening and tonight.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

Dorn

In the hours before

Local storm report, Apr 6, 8:14 PM CDT, 1 hour before
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Local storm report, Apr 6, 8:37 PM CDT, 37 minutes before
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Special weather statement, Apr 6, 8:41 PM CDT, 33 minutes before
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Special weather statement, Apr 6, 8:51 PM CDT, 23 minutes before
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Local storm report, Apr 6, 8:55 PM CDT, 19 minutes before
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Local storm report, Apr 6, 9:08 PM CDT, 6 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
908 PM CDT MON APR 6 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0845 PM     HAIL             BARNARD                 45.73N 98.50W
04/06/2020  M0.88 INCH       BROWN              SD   TRAINED SPOTTER

&&

RV

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 6, 7:31 PM CDTSpecial Weather StatementABREdmunds29 min
Apr 6, 7:45 PM CDTSevere Thunderstorm WarningABRBrown, Edmunds, McPherson45 min
Apr 6, 8:01 PM CDTSpecial Weather StatementABRMcPherson29 min
Apr 6, 8:41 PM CDTSpecial Weather StatementABRBrown34 min
Apr 6, 8:51 PM CDTSpecial Weather StatementABRMarshall24 min
Apr 6, 9:56 PM CDTSevere Thunderstorm WarningABRMarshall, Roberts49 min
Apr 6, 10:43 PM CDTSpecial Weather StatementABRRoberts32 min
Apr 6, 11:01 PM CDTSevere Thunderstorm WarningABRBig Stone, Traverse29 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 2020Every severe thunderstorm warning in 2020

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.