Alert archive / South Dakota / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 93, NWS Aberdeen, SD

June 27, 20184 counties in South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Jun 27, 2018, 4:13 AM CDT for 4 counties in South Dakota. It was in force for 47 min. 3 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: Jun 27, 2018, 4:13 AM CDT (09:13 UTC)
Expired: Jun 27, 2018, 5:00 AM CDT
In force: 47 min
Issued by: NWS Aberdeen, SD
Area: Storm-based polygon
Hail: 1.75 in
Wind: 60.0 mph

Counties Buffalo County, SD, Hughes County, SD, Hyde County, SD, Lyman County, SD

The radar

The Aberdeen radar (KABR), 175 km from the middle of the area, began a volume at 09:15 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
Jun 27, 4:40 AM CDT	TSTM WND DMG	4 N Lower Brule, SD	SEVERAL CENTER PIVOTS OVERTURNED, BEANS FLATTENED AND CORN STRIPPED.
Jun 27, 5:00 AM CDT	TSTM WND GST 60	1 N Lower Brule, SD
Jun 27, 5:05 AM CDT	HAIL 1	1 N Lower Brule, SD

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 2 storm reports to this severe thunderstorm warning; the first came 27 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
Jun 27, 12:12 AM CDT	Severe Thunderstorm Watch	SPC	9 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 9.2 hours before the alert went out and 135 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: 39 J/kg
Mixed-layer CIN: -213 J/kg
Mixed-layer LCL: 1431 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 24 m²/s²
0-3 km storm-relative helicity: 96 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

992 
WUUS53 KABR 270913
SVRABR
SDC017-065-069-085-271000-
/O.NEW.KABR.SV.W.0093.180627T0913Z-180627T1000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Aberdeen SD
413 AM CDT WED JUN 27 2018

The National Weather Service in Aberdeen has issued a

* Severe Thunderstorm Warning for...
  Southern Hyde County in central South Dakota...
  Eastern Hughes County in central South Dakota...
  Northeastern Lyman County in central South Dakota...
  Northwestern Buffalo County in central South Dakota...

* Until 500 AM CDT.

* At 413 AM CDT, a severe thunderstorm was located near Canning, or
  20 miles east of Pierre, moving southeast at 50 mph.

  HAZARD...Golf ball size hail and 60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...People and animals outdoors will be injured. Expect hail 
           damage to roofs, siding, windows, and vehicles. Expect 
           wind damage to roofs, siding, and trees.

* Locations impacted include...
  Lower Brule, Fort Thompson, Counselor Creek Boat Access Area,
  Stephan, Rousseau, Lake Sharpe, Joe Creek Rec Area, Canning, Degrey
  Rec Area and West Bend Rec Area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This is a dangerous storm. Prepare immediately for large destructive
hail capable of producing significant damage. People outside should
move to shelter inside a strong building,  and stay away from
windows.

&&

LAT...LON 4419 9994 4424 9989 4426 9990 4427 9992
      4427 9998 4429 10004 4431 10009 4437 10017
      4452 9994 4438 9933 4417 9931 4395 9964
TIME...MOT...LOC 0913Z 311DEG 42KT 4441 9991 

HAIL...1.75IN
WIND...60MPH
 
$$

Connelly

1 follow-up statement

214 
WWUS53 KABR 271003
SVSABR

Severe Weather Statement
National Weather Service Aberdeen SD
503 AM CDT WED JUN 27 2018

SDC017-065-069-085-271012-
/O.EXP.KABR.SV.W.0093.000000T0000Z-180627T1000Z/
Hyde SD-Hughes SD-Lyman SD-Buffalo SD-
503 AM CDT WED JUN 27 2018

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN HYDE...EASTERN
HUGHES...NORTHEASTERN LYMAN AND NORTHWESTERN BUFFALO COUNTIES HAS
EXPIRED...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning has
been allowed to expire.

A Severe Thunderstorm Watch remains in effect until 700 AM CDT for
central South Dakota.

LAT...LON 4419 9994 4424 9989 4426 9990 4427 9992
      4427 9998 4429 10004 4431 10009 4437 10017
      4452 9994 4438 9933 4417 9931 4395 9964
TIME...MOT...LOC 1002Z 311DEG 42KT 4403 9931 

$$

Connelly

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 Jun 27, 1:48 AM CDT, 2 hours 25 minutes earlier.

Area forecast discussion, Jun 27, 1:48 AM CDT, 2 hours 25 minutes before

Area Forecast Discussion
National Weather Service Aberdeen SD
148 AM CDT Wed Jun 27 2018

.SHORT TERM...(Today and Tonight)
Issued at 145 AM CDT Wed Jun 27 2018

Tracking several cells west river and the consensus from SPC and as
is indicated by CAMS to become mainly a wind producer as it heads
southeast along the gradient of MUCAPE with around 1000j/kg DCAPE.
This convection will force a surface front down into south central
South Dakota by morning, while dry air filters in from North Dakota
into our northern tier. The convective boundary may be a focus for
additional convection, however we will see some ridging aloft today,
with no waves evident, though 700mb temperatures only begin to see
strong warm advection tonight. CAMS hint that any convection will be
weak and isolated under the lack of forcing aloft, even though GFS
BUFKIT profiles are unstable - so its something to watch but
probably won't be an issue.

.LONG TERM...(Thursday through Tuesday)
Issued at 145 AM CDT Wed Jun 27 2018

Weak ridging will give way to southwest flow aloft on Thursday.
Plenty of energy moving through this pattern, and the severe setup is
looking quite favorable (3000+ J/KG of CAPE, 40 KTS of 0-6 KM shear,
8 C/KM 700-500 MB lapse rates, 15 KTS of 0-1 KM shear) however, the
tricky part of the forecast will be how strong and how far north the
CAP sets up and inhibits development. Most models are showing 700 mb
temps across the northern CWA anywhere from 13 C to 15 C (up to 17 C
across the southern CWA) by 00Z Friday. If storms can develop in our
CWA it will likely be across the far north, otherwise, it looks like
it is going to be mainly a North Dakota show. Most deterministic
models suggest an MCS developing over western ND and tracking east
Thursday night into Friday morning.

The surface low and associated cold front track across the CWA
Friday morning, likely setting up just on the eastern edge of our
CWA by Friday afternoon/evening. Models still show surface dewpoints
quite high across the far eastern CWA, so it will just be a matter
of timing of the front as to weather storms develop in our CWA or
east of our CWA. Otherwise, the upper level trough approaches and
models are showing post frontal thunderstorm development late Friday
through they day Saturday.

A zonal flow pattern returns for Sunday and the beginning of the
work week. Temperatures rise and moisture returns the region by the
Tuesday/Wednesday time frame.

&&

.AVIATION...(For the 06Z TAFS through 06Z Wednesday Night)
Issued at 1221 AM CDT Wed Jun 27 2018

MVFR cigs will work their way back over the far eastern part of the
CWA overnight, affecting KATY. Scattered showers and thunderstorms
are also possible from the northwestern CWA to the south central CWA
overnight. MVFR vsbys will be possible with the thunderstorms. VFR
conditions will prevail during the day Wednesday.

&&

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

SHORT TERM...Connelly
LONG TERM...Serr
AVIATION...Connelly

Hazardous weather outlook, Jun 27, 3:41 AM CDT, 32 minutes before

Hazardous Weather Outlook
National Weather Service Aberdeen SD
341 AM CDT Wed Jun 27 2018

MNZ039-046-SDZ003>011-015>023-033>037-045-048-051-280845-
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-
341 AM CDT Wed Jun 27 2018 /241 AM MDT Wed Jun 27 2018/

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

.DAY ONE...Today and Tonight

Early morning storms over central South Dakota, isolated severe,
will track southeast and exit the region by late morning.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday

Another round of severe storms is possible Thursday afternoon into
Friday. The threat is greatest for northwest South Dakota and much
of North Dakota, although the atmosphere will be prime for
thunderstorms across the region.

.SPOTTER INFORMATION STATEMENT...

Spotters are encouraged to report severe weather today and
Thursday.

KS

In the hours before

Local storm report, Jun 27, 1:24 AM CDT, 2 hours 49 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
124 AM CDT WED JUN 27 2018

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

0115 AM     TSTM WND GST     2 NW SHAMBO RANCH       45.55N 101.87W
06/27/2018  E59 MPH          CORSON             SD   MESONET

&&

KS

Local storm report, Jun 27, 2:31 AM CDT, 1 hour 42 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
231 AM CDT WED JUN 27 2018

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

0225 AM     TSTM WND GST     4 NNE EAGLE BUTTE       45.06N 101.20W
06/27/2018  M56 MPH          DEWEY              SD   MESONET

&&

KS

Local storm report, Jun 27, 4:08 AM CDT, 5 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
408 AM CDT WED JUN 27 2018

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

0405 AM     TSTM WND GST     5 WNW BLUNT             44.55N 100.08W
06/27/2018  E55 MPH          SULLY              SD   TRAINED SPOTTER

            PEA TO NICKEL SIZE HAIL.

&&

KS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 27, 12:39 AM CDT	Severe Thunderstorm Warning	ABR	Corson	51 min
Jun 27, 1:18 AM CDT	Severe Thunderstorm Warning	ABR	Corson, Dewey	42 min
Jun 27, 1:58 AM CDT	Severe Thunderstorm Warning	ABR	Dewey	47 min
Jun 27, 2:42 AM CDT	Severe Thunderstorm Warning	ABR	Dewey, Potter, Sully	48 min
Jun 27, 3:28 AM CDT	Severe Thunderstorm Warning	ABR	Dewey, Hughes, Stanley, Sully	47 min
Jun 27, 4:49 AM CDT	Severe Thunderstorm Warning	ABR	Buffalo, Hand, Hyde, Lyman	26 min
Jun 27, 5:44 AM CDT	Areal Flood Warning	ABR	Hughes	3 hr
Jun 27, 6:13 AM CDT	Severe Thunderstorm Warning	ABR	Buffalo, Lyman	32 min
Jun 27, 6:16 AM CDT	Severe Thunderstorm Warning	ABR	Hughes, Stanley	29 min
Jun 27, 6:30 AM CDT	Severe Thunderstorm Warning	ABR	Hughes, Lyman, Stanley	30 min
Jun 27, 6:43 AM CDT	Severe Thunderstorm Warning	ABR	Buffalo, Lyman	17 min
Jun 27, 6:50 AM CDT	Flash Flood Warning	ABR	Hughes, Stanley	3 hr
Jun 27, 6:53 AM CDT	Severe Thunderstorm Warning	ABR	Hughes, Lyman, Stanley	37 min
Jun 27, 7:25 AM CDT	Severe Thunderstorm Warning	ABR	Buffalo, Lyman	50 min
Jun 27, 8:13 AM CDT	Severe Thunderstorm Warning	ABR	Lyman	17 min
Jun 27, 9:34 AM CDT	Areal Flood Warning	ABR	Lyman	3 hr
Jun 27, 9:48 AM CDT	Areal Flood Warning	ABR	Hughes, Stanley, Sully	3 hr
Jun 27, 10:03 AM CDT	Flash Flood Warning	ABR	Lyman	3 hr

Nearby

Severe Thunderstorm Warnings in South Dakota, 2018 Every severe thunderstorm warning in 2018

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.