Alert archive / South Dakota / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 99, NWS Aberdeen, SD

July 2, 2020Lyman County, Stanley County, South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Jul 2, 2020, 9:16 PM CDT for Lyman County, Stanley County, South Dakota. It was in force for 44 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 2, 2020, 9:16 PM CDT (02:16 UTC)
Expired
Jul 2, 2020, 10:00 PM CDT
In force
44 min
Issued by
NWS Aberdeen, SD
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Lyman County, SD, Stanley County, SD

The radar

The Rapid City radar (KUDX), 203 km from the middle of the area, began a volume at 02:18 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 2, 2:15 PM CDTSevere Thunderstorm WatchSPC9 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 2.3 hours before the alert went out and 171 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 2020-07-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1949 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 2020-07-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -32 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
1949 J/kg
Mixed-layer CIN
-83 J/kg
Mixed-layer LCL
1823 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
-32 m²/s²
0-3 km storm-relative helicity
99 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 Jul 2, 6:26 PM CDT, 2 hours 50 minutes earlier.

Area forecast discussion, Jul 2, 6:26 PM CDT, 2 hours 50 minutes before
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Hazardous weather outlook, Jul 2, 4:14 AM CDT, 17 hours 2 minutes before
Hazardous Weather Outlook
National Weather Service Aberdeen SD
414 AM CDT Thu Jul 2 2020

SDZ003-004-009-015-016-033>035-045-048-030915-
Corson-Campbell-Walworth-Dewey-Potter-Stanley-Sully-Hughes-Jones-
Lyman-
414 AM CDT Thu Jul 2 2020 /314 AM MDT Thu Jul 2 2020/

This Hazardous Weather Outlook is for central South Dakota and
north central South Dakota.

.DAY ONE...Today and tonight.

Strong to severe storms will be possible late this afternoon through
this evening. Some storms may be capable of producing golf ball size
hail and 60 mph wind gusts.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Additional afternoon and nighttime thunderstorms are possible Friday
through early next week. Some storms on Friday and Saturday could
become strong to severe.

.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.

SDZ005-006-010-017>019-036-037-051-030915-
McPherson-Brown-Edmunds-Faulk-Spink-Clark-Hyde-Hand-Buffalo-
414 AM CDT Thu Jul 2 2020

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

.DAY ONE...Today and tonight.

Thunderstorms will be possible tonight. While severe weather is not
expected, some storms could produce small hail and gusty winds.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Additional afternoon and nighttime thunderstorms are possible Friday
through early next week. Some storms on Friday and Saturday could
become strong to severe.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

MNZ039-046-SDZ007-008-011-020>023-030915-
Traverse-Big Stone-Marshall-Roberts-Day-Codington-Grant-Hamlin-Deuel-
414 AM CDT Thu Jul 2 2020

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

.DAY ONE...Today and tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Additional afternoon and nighttime thunderstorms are possible Friday
through early next week. Some storms on Friday and Saturday could
become strong to severe.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

SD

In the hours before

Local storm report, Jul 2, 7:23 PM CDT, 1 hour 53 minutes before
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Local storm report, Jul 2, 7:36 PM CDT, 1 hour 40 minutes before
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Local storm report, Jul 2, 7:48 PM CDT, 1 hour 28 minutes before
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Special weather statement, Jul 2, 7:50 PM CDT, 1 hour 26 minutes before
Special Weather Statement
National Weather Service Aberdeen SD
750 PM CDT Thu Jul 2 2020

SDZ003-004-009-030130-
Walworth SD-Campbell SD-Corson SD-
750 PM CDT Thu Jul 2 2020

...SIGNIFICANT WEATHER ADVISORY FOR EASTERN CORSON...WESTERN CAMPBELL
AND NORTHWESTERN WALWORTH COUNTIES UNTIL 830 PM CDT/730 PM MDT/...

At 749 PM CDT/649 PM MDT/, Doppler radar was tracking strong
thunderstorms along a line extending from 10 miles northwest of Kenel
to near Trail City. Movement was east at 35 mph.

Wind gusts up to 50 mph will be possible with these storms.

Locations impacted include...
Mobridge, Wakpala, Pollock, Glenham, Indian Memorial Rec Area, Trail
City, Mahto, Revheim Bay Rec Area, Grand River Casino, Kenel and
Indian Creek Rec Area.

A Severe Thunderstorm Watch remains in effect until 900 PM CDT/800 PM
MDT/ for north central South Dakota.

LAT...LON 4594 10009 4547 10013 4547 10081 4594 10078
TIME...MOT...LOC 0049Z 271DEG 29KT 4594 10063 4547 10066

Parkin
Special weather statement, Jul 2, 9:03 PM CDT, 13 minutes before
Special Weather Statement
National Weather Service Aberdeen SD
903 PM CDT Thu Jul 2 2020

SDZ016-017-033>037-045-048-030245-
Hand SD-Hughes SD-Stanley SD-Sully SD-Hyde SD-Lyman SD-Potter SD-
Faulk SD-Jones SD-
903 PM CDT Thu Jul 2 2020

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN JONES...NORTHWESTERN
HAND...EASTERN SULLY...HYDE...SOUTHWESTERN FAULK...SOUTHEASTERN
POTTER...SOUTHEASTERN STANLEY...HUGHES AND NORTHWESTERN LYMAN
COUNTIES UNTIL 945 PM CDT/845 PM MDT/...

At 903 PM CDT/803 PM MDT/, Doppler radar was tracking strong
thunderstorms along a line extending from near Stone Lake to 7 miles
southeast of Wendte. Movement was east at 25 mph.

Wind gusts up to 50 mph will be possible with these storms.

Locations impacted include...
Pierre, Fort Pierre, Gettysburg, Highmore, Onida, Blunt, Harrold,
Agar, Grey Goose, Cedar Creek Rec Area, Polo, Rousseau, Cottonwood
Lake Near Agar, Joe Creek Rec Area, Stone Lake, Canning, Holabird,
Sully Lake, Overlook Rec Area and Lake Sharpe.

LAT...LON 4483 9892 4394 10004 4412 10075 4436 10056
      4500 9995
TIME...MOT...LOC 0203Z 282DEG 24KT 4484 9970 4416 10057

Lueck

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 2, 7:46 PM CDTSevere Thunderstorm WarningABRDewey, Potter, Walworth44 min
Jul 2, 7:50 PM CDTSpecial Weather StatementABRCampbell40 min
Jul 2, 8:07 PM CDTSevere Thunderstorm WarningABRDewey, Hughes, Potter, Stanley, Sully38 min
Jul 2, 8:33 PM CDTSevere Thunderstorm WarningABRHughes, Stanley, Sully42 min
Jul 2, 8:52 PM CDTSevere Thunderstorm WarningABRJones, Stanley53 min
Jul 2, 9:03 PM CDTSpecial Weather StatementABRHughes, Hyde, Sully42 min
Jul 2, 9:29 PM CDTSevere Thunderstorm WarningABRJones, Lyman, Stanley46 min
Jul 2, 9:48 PM CDTSpecial Weather StatementABRBuffalo, Hyde42 min
Jul 2, 10:19 PM CDTSpecial Weather StatementABRLyman56 min
Jul 2, 10:55 PM CDTSevere Thunderstorm WarningABRHand, Hyde26 min
Jul 3, 4:43 AM CDTSpecial Weather StatementABRCorson47 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.