Alert archive / South Dakota / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 131, NWS Aberdeen, SD

July 5, 2020Brown County, Day County, South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Jul 5, 2020, 9:19 PM CDT for Brown County, Day County, South Dakota. It was in force for 41 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 5, 2020, 9:19 PM CDT (02:19 UTC)
Expired
Jul 5, 2020, 10:00 PM CDT
In force
41 min
Issued by
NWS Aberdeen, SD
Area
Storm-based polygon
Hail
0.75 in
Wind
70.0 mph

Counties Brown County, SD, Day County, SD

The radar

The Aberdeen radar (KABR), 34 km from the middle of the area, began a volume at 02:22 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.

IssuedProductOfficeLasted
Jul 5, 4:41 PM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 2.3 hours before the alert went out and 72 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 2020-07-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1093 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 2020-07-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 208 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
1093 J/kg
Mixed-layer CIN
-245 J/kg
Mixed-layer LCL
1362 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
208 m²/s²
0-3 km storm-relative helicity
265 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

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 5, 9:14 PM CDT, 5 minutes earlier.

Area forecast discussion, Jul 5, 9:14 PM CDT, 5 minutes before
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Hazardous weather outlook, Jul 5, 5:03 AM CDT, 16 hours 16 minutes before
Hazardous Weather Outlook
National Weather Service Aberdeen SD
503 AM CDT Sun Jul 5 2020

MNZ039-046-SDZ003>011-015>023-033>037-045-048-051-061015-
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-
503 AM CDT Sun Jul 5 2020 /403 AM MDT Sun Jul 5 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.

Expect a cold front to be the main focus for thunderstorm
development initially this afternoon, although an expanded area of
thunderstorms is possible later in the evening. Some storms may be
severe with strong winds in excess of 70 mph and hail the size of
golf balls or larger possible. Heavy rain is also a threat.

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

The front will stall on Monday, with additional thunderstorm
development possible in the afternoon and evening, mainly for parts
of southeast South Dakota and west central Minnesota.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will likely be needed. 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.

In the hours before

Local storm report, Jul 5, 8:17 PM CDT, 1 hour 2 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
817 PM CDT SUN JUL 5 2020

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

0816 PM     TSTM WND GST     7 S BOWDLE              45.35N 99.65W
07/05/2020  E75 MPH          EDMUNDS            SD   EMERGENCY MNGR

&&

KF
Local storm report, Jul 5, 8:21 PM CDT, 58 minutes before
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Local storm report, Jul 5, 8:54 PM CDT, 25 minutes before
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Local storm report, Jul 5, 9:13 PM CDT, 6 minutes before
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Special weather statement, Jul 5, 9:13 PM CDT, 6 minutes before
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Special weather statement, Jul 5, 9:14 PM CDT, 5 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jul 5, 7:15 PM CDTSevere Thunderstorm WarningABRBuffalo, Hand, Hyde, Lyman75 min
Jul 5, 7:24 PM CDTTornado WarningABRMcPherson21 min
Jul 5, 7:53 PM CDTSevere Thunderstorm WarningABRMcPherson52 min
Jul 5, 8:04 PM CDTSevere Thunderstorm WarningABREdmunds, Walworth26 min
Jul 5, 8:12 PM CDTSevere Thunderstorm WarningABRMcPherson48 min
Jul 5, 8:16 PM CDTTornado WarningABRMcPherson29 min
Jul 5, 8:17 PM CDTTornado WarningABREdmunds, Potter, Walworth28 min
Jul 5, 8:30 PM CDTSevere Thunderstorm WarningABREdmunds, Faulk, Potter30 min
Jul 5, 8:31 PM CDTTornado WarningABREdmunds, McPherson14 min
Jul 5, 8:44 PM CDTSevere Thunderstorm WarningABREdmunds, McPherson46 min
Jul 5, 9:13 PM CDTSpecial Weather StatementABRWalworth32 min
Jul 5, 9:14 PM CDTSpecial Weather StatementABRBrown46 min
Jul 5, 9:50 PM CDTSpecial Weather StatementABREdmunds25 min
Jul 5, 9:56 PM CDTSpecial Weather StatementABRRoberts49 min
Jul 5, 10:36 PM CDTSpecial Weather StatementABRStanley39 min
Jul 6, 12:14 AM CDTSpecial Weather StatementABRDewey31 min
Jul 6, 3:03 AM CDTAreal Flood WarningABRMcPherson12 hr

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.