Alert archive / South Dakota / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 108, NWS Aberdeen, SD

July 4, 20204 counties in South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Jul 4, 2020, 7:59 PM CDT for 4 counties in 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: Jul 4, 2020, 7:59 PM CDT (00:59 UTC)
Expired: Jul 4, 2020, 8:45 PM CDT
In force: 46 min
Issued by: NWS Aberdeen, SD
Area: Storm-based polygon
Hail: 2.0 in
Wind: 60.0 mph

Counties Campbell County, SD, Edmunds County, SD, McPherson County, SD, Walworth County, SD

The radar

The Aberdeen radar (KABR), 96 km from the middle of the area, began a volume at 01:04 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 4, 3:53 PM CDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 1.0 hours before the alert went out and 124 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: 2388 J/kg
Mixed-layer CIN: -17 J/kg
Mixed-layer LCL: 1563 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 22 m²/s²
0-3 km storm-relative helicity: 70 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.1

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 4, 6:31 PM CDT, 1 hour 28 minutes earlier.

Area forecast discussion, Jul 4, 6:31 PM CDT, 1 hour 28 minutes before

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Hazardous weather outlook, Jul 4, 4:40 AM CDT, 15 hours 19 minutes before

Hazardous Weather Outlook
National Weather Service Aberdeen SD
440 AM CDT Sat Jul 4 2020

MNZ039-046-SDZ003>011-015>023-033>037-045-048-051-050945-
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-
440 AM CDT Sat Jul 4 2020 /340 AM MDT Sat Jul 4 2020/

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.

Strong to potential severe storms can be expected over north-central
South Dakota through the morning hours today. Winds, exceeding 60 mph
and small hail will be possible with these storms.

Additional thunderstorms will be possible tonight, mainly for
locations north of Highway 212. Gusty winds and hail will be possible
with some storms.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

Strong to severe storms will be possible late Sunday afternoon
through the evening hours. Large hail exceeding 2 inches in diameter,
and gusty winds of 60-70 mph will be the main severe threats.

.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.

SD

In the hours before

Special weather statement, Jul 4, 6:56 PM CDT, 1 hour 3 minutes before

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Special weather statement, Jul 4, 6:58 PM CDT, 1 hour 1 minute before

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Local storm report, Jul 4, 7:04 PM CDT, 55 minutes before

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Local storm report, Jul 4, 7:11 PM CDT, 48 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
711 PM CDT SAT JUL 4 2020

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

0658 PM     TSTM WND DMG     10 SW LONG LAKE         45.77N 99.36W
07/04/2020                   MCPHERSON          SD   MESONET

            MESONET STATION 184 EUREKA (SDDOT).

&&

KF

Local storm report, Jul 4, 7:59 PM CDT, 0 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
759 PM CDT SAT JUL 4 2020

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

0745 PM     TSTM WND GST     2 W RICHMOND LAKE REC A 45.54N 98.64W
07/04/2020  M58 MPH          BROWN              SD   MESONET

            MESONET STATION EW9368 ABERDEEN 9 NW.

&&

KF

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 4, 7:04 PM CDT	Severe Thunderstorm Warning	ABR	Brown, Edmunds, McPherson	41 min
Jul 4, 7:27 PM CDT	Severe Thunderstorm Warning	ABR	Stanley	19 min
Jul 4, 7:48 PM CDT	Severe Thunderstorm Warning	ABR	Brown, Edmunds, McPherson	57 min
Jul 4, 8:29 PM CDT	Special Weather Statement	ABR	Walworth	46 min
Jul 4, 8:39 PM CDT	Severe Thunderstorm Warning	ABR	Faulk, Hand, Spink	51 min
Jul 4, 8:41 PM CDT	Severe Thunderstorm Warning	ABR	Walworth	49 min
Jul 4, 8:44 PM CDT	Severe Thunderstorm Warning	ABR	Brown, Edmunds	46 min
Jul 4, 8:52 PM CDT	Severe Thunderstorm Warning	ABR	Edmunds, Faulk, Hand	68 min
Jul 4, 9:17 PM CDT	Severe Thunderstorm Warning	ABR	Edmunds, Potter, Walworth	43 min
Jul 4, 9:30 PM CDT	Severe Thunderstorm Warning	ABR	Faulk, Hand, Spink	60 min
Jul 4, 9:41 PM CDT	Tornado Warning	ABR	Faulk, Spink	21 min
Jul 4, 9:50 PM CDT	Severe Thunderstorm Warning	ABR	Edmunds, Faulk, Potter, Walworth	40 min
Jul 4, 10:07 PM CDT	Special Weather Statement	ABR	Campbell	38 min
Jul 4, 11:18 PM CDT	Areal Flood Warning	ABR	Hand	12 hr
Jul 4, 11:22 PM CDT	Special Weather Statement	ABR	Hyde	38 min
Jul 5, 12:00 AM CDT	Severe Thunderstorm Warning	ABR	Hand, Hyde	30 min
Jul 5, 12:45 AM CDT	Areal Flood Warning	ABR	Hand	60 hr
Jul 5, 12:54 AM CDT	Special Weather Statement	ABR	Hand	36 min
Jul 5, 1:08 AM CDT	Special Weather Statement	ABR	Corson	52 min
Jul 5, 12:34 PM CDT	Flash Flood Watch	ABR	Brown, Edmunds, Faulk, Hand, Hyde, McPherson and 1 more	15 hr
Jul 5, 1:01 PM CDT	Special Weather Statement	ABR	Spink	29 min
Jul 5, 4:02 PM CDT	Special Weather Statement	ABR	Marshall	28 min
Jul 5, 4:24 PM CDT	Severe Thunderstorm Warning	ABR	Jones, Stanley	51 min
Jul 5, 4:36 PM CDT	Severe Thunderstorm Warning	ABR	Jones, Stanley	39 min
Jul 5, 5:15 PM CDT	Special Weather Statement	ABR	Jones	45 min
Jul 5, 5:19 PM CDT	Severe Thunderstorm Warning	ABR	Jones, Lyman	41 min
Jul 5, 5:42 PM CDT	Severe Thunderstorm Warning	ABR	Hughes, Lyman	48 min
Jul 5, 5:53 PM CDT	Severe Thunderstorm Warning	ABR	Jones, Lyman	52 min
Jul 5, 6:07 PM CDT	Severe Thunderstorm Warning	ABR	Faulk, Hand, Spink	53 min
Jul 5, 6:32 PM CDT	Severe Thunderstorm Warning	ABR	Faulk, Hand, Spink	48 min
Jul 5, 6:42 PM CDT	Severe Thunderstorm Warning	ABR	Lyman	78 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 2020 Every 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.