Alert archive / South Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 132, NWS Aberdeen, SD

August 26, 2021Deuel County, Hamlin County, South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Aug 26, 2021, 9:58 AM CDT for Deuel County, Hamlin County, South Dakota. It was in force for 62 min. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Aug 26, 2021, 9:58 AM CDT (14:58 UTC)
Expired: Aug 26, 2021, 11:00 AM CDT
In force: 62 min
Issued by: NWS Aberdeen, SD
Area: Storm-based polygon
Tornado: Possible
Hail: 0.88 in
Wind: 60.0 mph

Counties Deuel County, SD, Hamlin County, SD

The radar

The Sioux Falls radar (KFSD), 117 km from the middle of the area, began a volume at 15:00 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.

What was reported inside it

Time	Report	Where	Remark
Aug 26, 10:02 AM CDT	TSTM WND GST 61	3 Ene Hayti, SD	PERSONAL WEATHER STATION. TIME ESTIMATED BY RADAR.
Aug 26, 10:31 AM CDT	TSTM WND GST 75	7 Ne Estelline, SD	MESONET STATION 47 BRANDT (SDDOT).

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched 3 storm reports to this severe thunderstorm warning; the first came 4 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Aug 26, 9:05 AM CDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 3.0 hours before the alert went out and 112 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: 1092 m above ground
0-6 km bulk shear: 62 kt
0-1 km storm-relative helicity: 365 m²/s²
0-3 km storm-relative helicity: 490 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.4

Open this sounding in Storm Lab

The text

As transmitted.

171 
WUUS53 KABR 261458
SVRABR
SDC039-057-261600-
/O.NEW.KABR.SV.W.0132.210826T1458Z-210826T1600Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Aberdeen SD
958 AM CDT Thu Aug 26 2021

The National Weather Service in Aberdeen has issued a

* Severe Thunderstorm Warning for...
  Southern Deuel County in northeastern South Dakota...
  Hamlin County in northeastern South Dakota...

* Until 1100 AM CDT.

* At 956 AM CDT, a severe thunderstorm was located near Hamlin
  Education Center, or 17 miles west of Estelline, moving east at 45
  mph.

  HAZARD...60 mph wind gusts and nickel size hail.

  SOURCE...Public. At 940 am cdt, 60 MPH winds was reported at 
           Mayfield Colony in Clark County.

  IMPACT...Expect damage to roofs, siding, and trees.

* This severe thunderstorm will be near...
  Lake Norden and Hayti around 1000 AM CDT.
  Lake Albert around 1005 AM CDT.
  Stone Bridge and Lake Poinsett around 1010 AM CDT.

Other locations in the path of this severe thunderstorm include
Estelline, Dempster, Poinsett Colony, Claremont Colony, Toronto,
Brandt, Astoria and Lake Cochrane Rec Area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

For your protection move to an interior room on the lowest floor of a
building.

To report severe weather, contact your nearest law enforcement
agency. They will send your report to the National Weather Service
office in Aberdeen.

&&

LAT...LON 4455 9744 4473 9738 4473 9645 4454 9646
TIME...MOT...LOC 1456Z 272DEG 37KT 4462 9726 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.88 IN
WIND THREAT...OBSERVED
MAX WIND GUST...60 MPH

$$

SD

4 follow-up statements

613 
WWUS53 KABR 261523
SVSABR

Severe Weather Statement
National Weather Service Aberdeen SD
1023 AM CDT Thu Aug 26 2021

SDC039-057-261600-
/O.CON.KABR.SV.W.0132.000000T0000Z-210826T1600Z/
Deuel SD-Hamlin SD-
1023 AM CDT Thu Aug 26 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1100 AM CDT
FOR SOUTHERN DEUEL AND SOUTHEASTERN HAMLIN COUNTIES...

At 1022 AM CDT, a severe thunderstorm was located over Poinsett
Colony, or near Estelline, moving east at 45 mph.

HAZARD...60 mph wind gusts and penny size hail.

SOURCE...Law enforcement. At 1004 am CDT, 62 mph winds were reported 
         at Castlewood.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
  Toronto, Brandt, Astoria and Lake Cochrane Rec Area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Aberdeen.

&&

LAT...LON 4455 9737 4473 9722 4473 9645 4454 9646
TIME...MOT...LOC 1522Z 269DEG 40KT 4462 9686 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...OBSERVED
MAX WIND GUST...60 MPH

$$

SD

144 
WWUS53 KABR 261533
SVSABR

Severe Weather Statement
National Weather Service Aberdeen SD
1033 AM CDT Thu Aug 26 2021

SDC039-057-261600-
/O.CON.KABR.SV.W.0132.000000T0000Z-210826T1600Z/
Deuel SD-Hamlin SD-
1033 AM CDT Thu Aug 26 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1100 AM CDT
FOR SOUTHERN DEUEL AND SOUTHEASTERN HAMLIN COUNTIES...

At 1033 AM CDT, a severe thunderstorm was located near Toronto, or 9
miles south of Clear Lake, moving east at 45 mph.

HAZARD...60 mph wind gusts and penny size hail.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Estelline, Castlewood, Toronto, Astoria, Brandt, Lake Poinsett, Lake
Cochrane Rec Area, Dempster, Stone Bridge, Lake Albert, Poinsett
Colony and Claremont Colony.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Aberdeen.

&&

LAT...LON 4455 9718 4473 9706 4473 9645 4454 9646
TIME...MOT...LOC 1533Z 272DEG 37KT 4462 9670 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

SD

696 
WWUS53 KABR 261546
SVSABR

Severe Weather Statement
National Weather Service Aberdeen SD
1046 AM CDT Thu Aug 26 2021

SDC057-261556-
/O.CAN.KABR.SV.W.0132.000000T0000Z-210826T1600Z/
Hamlin SD-
1046 AM CDT Thu Aug 26 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN HAMLIN COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has weakened.
Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 300 PM CDT for
northeastern South Dakota.

LAT...LON 4455 9687 4472 9687 4473 9645 4454 9646
TIME...MOT...LOC 1546Z 272DEG 37KT 4462 9651 

$$

SDC039-261600-
/O.CON.KABR.SV.W.0132.000000T0000Z-210826T1600Z/
Deuel SD-
1046 AM CDT Thu Aug 26 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1100 AM CDT
FOR SOUTHERN DEUEL COUNTY...

At 1046 AM CDT, a severe thunderstorm was located near Astoria, or 12
miles southeast of Clear Lake, moving east at 45 mph.

HAZARD...60 mph wind gusts and penny size hail.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Toronto, Astoria, Brandt and Lake Cochrane Rec Area. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Aberdeen.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4455 9687 4472 9687 4473 9645 4454 9646
TIME...MOT...LOC 1546Z 272DEG 37KT 4462 9651 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

SD

069 
WWUS53 KABR 261555
SVSABR

Severe Weather Statement
National Weather Service Aberdeen SD
1055 AM CDT Thu Aug 26 2021

SDC039-261605-
/O.EXP.KABR.SV.W.0132.000000T0000Z-210826T1600Z/
Deuel SD-
1055 AM CDT Thu Aug 26 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN DEUEL COUNTY WILL
EXPIRE AT 1100 AM CDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However gusty
winds are still possible with this thunderstorm.

A Severe Thunderstorm Watch remains in effect until 300 PM CDT for
northeastern South Dakota.

LAT...LON 4455 9687 4472 9687 4473 9645 4454 9646
TIME...MOT...LOC 1555Z 272DEG 37KT 4462 9641 

$$

SD

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 Aug 26, 6:48 AM CDT, 3 hours 10 minutes earlier.

Area forecast discussion, Aug 26, 6:48 AM CDT, 3 hours 10 minutes before

Area Forecast Discussion...UPDATED
National Weather Service Aberdeen SD
648 AM CDT Thu Aug 26 2021

.UPDATE...
Issued at 639 AM CDT Thu Aug 26 2021

See the updated aviation discussion below.

&&

.SHORT TERM...(Today through Friday Afternoon)
Issued at 306 AM CDT Thu Aug 26 2021

Main challenges in the short term will be the timing of various
shortwaves moving through southwest flow aloft -- and the ability of
this upper level forcing to produce strong to severe convection as
well as heavy rain over the next couple of days.

Disorganized and scattered warm air advection/elevated showers and
thunderstorms are currently ongoing across the northern CWA this
morning. Meanwhile another area of convection aligned with a more
distinct shortwave and the nose of a 30 KT LLJ is tracking into far
northwest South Dakota. CAMs don't entirely depict the ongoing
scenario, however a majority suggest the convection out west will be
able to maintain, increase in coverage and track across the CWA
between ~09-18Z. Steep mid level lapse rates, 1000-2000 J/KG of
MU CAPE and 50 KT of effective shear should be a sufficient
environment to support such a scenario. Hail is a threat, along
with strong winds. The big question will be if the storms can
persistently mix the strongest winds down to the surface. Lastly,
heavy rain will be a concern over the next couple of days. PWATs
are expected to top out over 1.5 inches this afternoon...topping
the scales for this time of the year.

Models suggest a break early this afternoon before another round of
convection develops later in the afternoon/evening tracking
northeast out of central South Dakota. And potentially a third round
of nocturnal convection into Friday morning. The threat for strong
to severe storms persists through the time period.

.LONG TERM...(Friday Evening through Wednesday)
Issued at 306 AM CDT Thu Aug 26 2021

Friday night into Saturday it appears we'll see a surface boundary
draped from the NE panhandle northeastward into southeast SD, and
into central MN. Aloft, shortwave energy will be digging into MT and
the western Dakotas. This will set the stage for shower and
thunderstorm potential through this time period. Chances look pretty
good given the upper level support and overall dynamics and
parameters. Could be dealing with strong to severe storms as well.
Models then agree fairly well in showing a brief lull in precip
chances Saturday night into Sunday as surface high pressure moves
across the area. After the high departs, it would appear we get into
a bit of an active pattern for a couple days as a few waves of
energy move across the northern plains. There is still quite a bit
of uncertainty regarding the timing and overall strength of these
waves, but it would seem the area will get into an unsettled pattern
again towards the end of the forecast period.

&&

.AVIATION...(For the 12Z TAFS through 12Z Friday Morning)
Issued at 639 AM CDT Thu Aug 26 2021

Terminals KABR,KATY,KPIR,KMBG

A couple of rounds of thunderstorms are possible today. A line of
storms is expected to impact the KABR and KATY TAF site before
18Z. Additional thunderstorms activity is possible later this
afternoon/evening over south central South Dakota, tracking
northeast into parts of east central South Dakota. Periods of
MVFR cigs and vsbys will be possible with any thunderstorms. IFR/MVFR
cigs will settle in through the end of the TAF period.

&&

.ABR WATCHES/WARNINGS/ADVISORIES...
SD...None.
MN...None.
&&

UPDATE...Serr
SHORT TERM...Serr
LONG TERM...TMT
AVIATION...Serr

Hazardous weather outlook, Aug 26, 3:32 AM CDT, 6 hours 26 minutes before

Hazardous Weather Outlook
National Weather Service Aberdeen SD
332 AM CDT Thu Aug 26 2021

MNZ039-046-SDZ003>011-015>023-033>037-045-048-051-270845-
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-
332 AM CDT Thu Aug 26 2021 /232 AM MDT Thu Aug 26 2021/

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.

Several rounds of thunderstorms are possible today and tonight. The
first round will track from west to east across the region through
the morning and early afternoon hours. A second round of
thunderstorms will likely track northeast from south central South
Dakota later this afternoon and evening. Yet another, third round of
thunderstorms is possible overnight and into Friday morning. Strong
to severe storms are possible at any time. Hail, strong winds and
heavy rain are all threats.

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

The unsettled pattern persists through the weekend, with several
rounds of strong to severe storms possible.

.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, Aug 26, 9:21 AM CDT, 37 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
921 AM CDT THU AUG 26 2021

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

0857 AM     TSTM WND DMG     DOLAND                  44.90N 98.10W
08/26/2021                   SPINK              SD   EMERGENCY MNGR

            4 INCH DIAMETER TREE SNAPPED AND DAMAGE TO
            THE ELEVATOR IN TOWN. TIME ESTIMATED FROM
            RADAR.

&&

SRF

Local storm report, Aug 26, 9:32 AM CDT, 26 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
932 AM CDT THU AUG 26 2021

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

0922 AM     TSTM WND DMG     CLARK                   44.88N 97.73W
08/26/2021                   CLARK              SD   EMERGENCY MNGR

            MULTIPLE TREES DOWN IN TOWN. ONE UPROOTED.
            POWERLINES DOWN AND POWER OUT IN PARTS OF
            TOWN.

&&

SRF

Local storm report, Aug 26, 9:35 AM CDT, 23 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
935 AM CDT THU AUG 26 2021

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

0927 AM     TSTM WND GST     CLARK                   44.88N 97.74W
08/26/2021  E60 MPH          CLARK              SD   TRAINED SPOTTER

            ESTIMATED 60 MPH WINDS AND A TREE BRANCH
            DOWN.

&&

SRF

Local storm report, Aug 26, 9:42 AM CDT, 16 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
942 AM CDT THU AUG 26 2021

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

0855 AM     TSTM WND DMG     3 W DOLAND              44.89N 98.16W
08/26/2021                   SPINK              SD   EMERGENCY MNGR

            8 POWER POLES DOWN AND MANY OF THEM SNAPPED
            OFF.

&&

SRF

Local storm report, Aug 26, 9:48 AM CDT, 10 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
948 AM CDT THU AUG 26 2021

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

0940 AM     TSTM WND GST     MAYFIELD COLONY         44.69N 97.56W
08/26/2021  E60 MPH          CLARK              SD   PUBLIC

            60 MPH WINDS AT MAYFIELD COLONY.

&&

SRF

Local storm report, Aug 26, 9:54 AM CDT, 4 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
954 AM CDT THU AUG 26 2021

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

0931 AM     TSTM WND GST     6 SSW PEEVER            45.46N 96.99W
08/26/2021  M67 MPH          ROBERTS            SD   MESONET

            MESONET STATION 143 PEEVER (SDDOT).

&&

SRF

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 26, 3:47 AM CDT	Severe Thunderstorm Warning	ABR	Corson	58 min
Aug 26, 4:44 AM CDT	Severe Thunderstorm Warning	ABR	Corson	46 min
Aug 26, 5:37 AM CDT	Special Weather Statement	ABR	Campbell, Dewey, Walworth	53 min
Aug 26, 7:19 AM CDT	Special Weather Statement	ABR	Edmunds, Faulk	26 min
Aug 26, 7:47 AM CDT	Severe Thunderstorm Warning	ABR	Faulk, Hand	43 min
Aug 26, 8:01 AM CDT	Severe Thunderstorm Warning	ABR	Faulk, Hand, Hyde	44 min
Aug 26, 8:11 AM CDT	Severe Thunderstorm Warning	ABR	Faulk, Spink	49 min
Aug 26, 8:18 AM CDT	Severe Thunderstorm Warning	ABR	Day, Marshall, Roberts	57 min
Aug 26, 8:24 AM CDT	Severe Thunderstorm Warning	ABR	Hand, Spink	36 min
Aug 26, 8:45 AM CDT	Severe Thunderstorm Warning	ABR	Clark, Spink	45 min
Aug 26, 9:14 AM CDT	Severe Thunderstorm Warning	ABR	Roberts	46 min
Aug 26, 9:22 AM CDT	Severe Thunderstorm Warning	ABR	Clark, Hamlin, Spink	38 min
Aug 26, 9:26 AM CDT	Severe Thunderstorm Warning	ABR	Clark, Codington, Hamlin	49 min
Aug 26, 9:50 AM CDT	High Wind Warning	ABR	Brown, Clark, Codington, Day, Deuel, Grant and 4 more	5 hr
Aug 26, 9:57 AM CDT	Severe Thunderstorm Warning	ABR	Grant, Roberts	33 min
Aug 26, 10:00 AM CDT	Severe Thunderstorm Warning	ABR	Codington, Deuel, Grant, Hamlin	60 min
Aug 26, 2:37 PM CDT	Severe Thunderstorm Warning	ABR	Roberts	23 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 2021 Every severe thunderstorm warning in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.