Alert archive / South Dakota / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 142, NWS Aberdeen, SD

July 4, 20184 counties in South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Jul 4, 2018, 1:07 AM CDT for 4 counties in South Dakota. It was in force for 38 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: Jul 4, 2018, 1:07 AM CDT (06:07 UTC)
Expired: Jul 4, 2018, 1:45 AM CDT
In force: 38 min
Issued by: NWS Aberdeen, SD
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

Counties Campbell County, SD, Corson County, SD, Dewey County, SD, Walworth County, SD

The radar

The Bismarck radar (KBIS), 117 km from the middle of the area, began a volume at 06:08 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
Jul 4, 1:55 AM CDT	TSTM WND DMG	Indian Creek Rec Area, SD	3 CAMPERS OVERTURNED AND BOAT DAMAGE AT THE MARINA. REPORTS VIA SOCIAL MEDIA.
Jul 4, 1:55 AM CDT	TSTM WND DMG	Mobridge, SD	NUMEROUS TREES AND TREE BRANCHES DOWN IN MOBRIDGE. REPORT VIA SOCIAL MEDIA.
Jul 4, 1:55 AM CDT	TSTM WND GST 95	2 E Mobridge, SD

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

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

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
Jul 3, 11:02 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 00:00Z, 6.1 hours before the alert went out and 116 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: 1282 J/kg
Mixed-layer CIN: -119 J/kg
Mixed-layer LCL: 1250 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 30 m²/s²
0-3 km storm-relative helicity: 150 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 4.6

Open this sounding in Storm Lab

The text

As transmitted.

950 
WUUS53 KABR 040607
SVRABR
SDC021-031-041-129-040645-
/O.NEW.KABR.SV.W.0142.180704T0607Z-180704T0645Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Aberdeen SD
107 AM CDT WED JUL 4 2018

The National Weather Service in Aberdeen has issued a

* Severe Thunderstorm Warning for...
  Eastern Corson County in north central South Dakota...
  Western Campbell County in north central South Dakota...
  Northeastern Dewey County in north central South Dakota...
  Northwestern Walworth County in north central South Dakota...

* Until 145 AM CDT/1245 AM MDT/.

* At 107 AM CDT/1207 AM MDT/, a severe thunderstorm was located near
  Mahto, or 8 miles southeast of Mclaughlin, moving east at 30 mph.

  HAZARD...60 mph wind gusts and half dollar size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Mobridge, Mclaughlin, Wakpala, Pollock, Glenham, Trail City, Mahto,
  Little Eagle, Kenel, Indian Creek Rec Area, Indian Memorial Rec
  Area, Spring Lake, Revheim Bay Rec Area, Grand River Casino,
  Glencross and New Everets Resort.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

This thunderstorm is capable of producing all types of severe weather
including extremely large hail, destructive straight line winds and
tornadoes. Move quickly to a safe shelter such as an interior room, a
bathroom, closet or basement.

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

&&

LAT...LON 4594 10020 4544 10020 4544 10095 4594 10083
TIME...MOT...LOC 0607Z 251DEG 27KT 4571 10070 

HAIL...1.25IN
WIND...60MPH
 
$$

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 Jul 4, 12:29 AM CDT, 38 minutes earlier.

Area forecast discussion, Jul 4, 12:29 AM CDT, 38 minutes before

Area Forecast Discussion...UPDATED
National Weather Service Aberdeen SD
1229 AM CDT Wed Jul 4 2018

.UPDATE...
Issued at 801 PM CDT Tue Jul 3 2018

Allowed heat advisory to expire. Developing thunderstorms are
adding to the cloud cover and temperatures are dropping in areas
receiving rain. Drier spots across south central SD will slowly
cool after sunset.

UPDATE Issued at 630 PM CDT Tue Jul 3 2018

Made a few tweaks to evening pops based on latest HRRR and current
radar returns. Otherwise, forecast remains on track for the
overnight period with two rounds of storms possible.

&&

.SHORT TERM...(This Evening through Wednesday)
Issued at 223 PM CDT Tue Jul 3 2018

Convection remains the main challenge in the short range.
Instability continues to increase across the region this afternoon as
diabatic heating continues. However, deep layer shear is probably
slackening as the mid level westerlies retreat to the north this
afternoon and evening. Also, heights continue to build
across the region with warming temps aloft. Meanwhile, ll shear will
remain decent through tonight given continued llj, and its diurnal
increase this evening. The CAMS and non-CAMS are at odds concerning
convective development in the northeast toward evening. The HRRR is
somewhat aggressive, perhaps picking up on outflow boundaries left
behind by the morning convection.  Non-CAMS favor activity
developing further north, or not at all over the northeast this
evening. Later in the evening there is fair agreement that an MCS
will fire up over the High Plains, and then head northeast
overnight. The main threat with the possible early evening
convection will be hail and heavy rain, and the late night activity
should favor gusty winds. Nonetheless, confidence in how all this
will play out is fairly low attm.  Temperatures will be above normal
through Wednesday.

.LONG TERM...(Wednesday Night through Tuesday)
Issued at 223 PM CDT Tue Jul 3 2018

Mid level ridge will expand from the eastern conus, back west to the
central conus during the period. The ridge does get knocked down
some by passing s/w energy late in the weekend, into early next
week. That is likely the best opportunity for any meaningful pcpn
during the period, since prior to that the strong mid level ridge
should provide for general subsidence across the Northern Plains.
Meanwhile, temperatures should remain near to above normal through
most of the period.

&&

.AVIATION...(For the 06Z TAFS through 06Z Wednesday Night)
Issued at 1225 AM CDT Wed Jul 4 2018

Showers and thunderstorms crossing the region early this morning
will bring mixed flying conditions. Southerly winds ahead the
storms will become northwesterly this afternoon.

&&

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

UPDATE...Wise
SHORT TERM...TDK
LONG TERM...TDK
AVIATION...SD

Hazardous weather outlook, Jul 3, 1:23 PM CDT, 11 hours 44 minutes before

Hazardous Weather Outlook...UPDATED
National Weather Service Aberdeen SD
123 PM CDT Tue Jul 3 2018

MNZ039-046-SDZ003>011-015>023-033>037-045-048-051-041830-
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-
123 PM CDT Tue Jul 3 2018 /1223 PM MDT Tue Jul 3 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...This Afternoon and Tonight

More storms are expected this evening and overnight. Severe storms
are possible with strong winds and large hail being the main
threats. Storms could fire first in the northeast, and then later
in the evening out west.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

Showers and storms will linger into Wednesday across the east.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed.

tdk

In the hours before

Special weather statement, Jul 3, 9:37 PM CDT, 3 hours 30 minutes before

Special Weather Statement
National Weather Service Aberdeen SD
937 PM CDT TUE JUL 3 2018

SDZ017-037-040330-
Hand SD-Faulk SD-
937 PM CDT TUE JUL 3 2018

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN HAND AND SOUTH
CENTRAL FAULK COUNTIES UNTIL 1030 PM CDT...

At 936 PM CDT, Doppler radar was tracking a strong thunderstorm near
Polo, or 14 miles north of Miller, moving northwest at 20 mph.

Nickel size hail will be possible with this storm.

Locations impacted include...
Orient and Polo.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

A Severe Thunderstorm Watch remains in effect until 100 AM CDT for
central and north central South Dakota.

LAT...LON 4502 9904 4471 9887 4463 9910 4488 9932
      4489 9931 4490 9933 4492 9935
TIME...MOT...LOC 0236Z 155DEG 18KT 4473 9904

Wise

Local storm report, Jul 3, 9:55 PM CDT, 3 hours 12 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
955 PM CDT TUE JUL 3 2018

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

0945 PM     HAIL             2 ENE POLO              44.79N 99.07W
07/03/2018  E1.00 INCH       HAND               SD   PUBLIC

            QUARTER SIZE HAIL REPORTED.

&&

DYE

Special weather statement, Jul 3, 10:31 PM CDT, 2 hours 36 minutes before

Special Weather Statement
National Weather Service Aberdeen SD
1031 PM CDT TUE JUL 3 2018

MNZ039-046-040415-
Traverse MN-Big Stone MN-
1031 PM CDT TUE JUL 3 2018

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN TRAVERSE AND
NORTHEASTERN BIG STONE COUNTIES UNTIL 1115 PM CDT...

At 1031 PM CDT, Doppler radar was tracking a strong thunderstorm over
Clinton, or 11 miles north of Ortonville, moving northeast at 20 mph.

Nickel size hail and winds in excess of 30 mph will be possible with
this storm.

Locations impacted include...
Graceville, Clinton, Johnson and Trinity Lutheran Country Church.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4540 9645 4550 9660 4569 9626 4566 9625
      4559 9625 4558 9624 4543 9624
TIME...MOT...LOC 0331Z 235DEG 16KT 4547 9645

SD

Special weather statement, Jul 3, 10:46 PM CDT, 2 hours 21 minutes before

Special Weather Statement
National Weather Service Aberdeen SD
946 PM MDT TUE JUL 3 2018

SDZ003-040430-
Corson SD-
946 PM MDT TUE JUL 3 2018

...SIGNIFICANT WEATHER ADVISORY FOR WESTERN CORSON COUNTY UNTIL 1030
PM MDT...

At 945 PM MDT, Doppler radar was tracking a strong thunderstorm near
Shambo Ranch, or 27 miles south of Lemmon, moving east at 35 mph.

Half inch hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Morristown, Watauga, Shambo Ranch, Keldron and Thunder Hawk.

LAT...LON 4594 10200 4594 10149 4547 10144 4547 10200
TIME...MOT...LOC 0345Z 257DEG 32KT 4556 10197

SD

Special weather statement, Jul 3, 11:05 PM CDT, 2 hours 2 minutes before

Special Weather Statement
National Weather Service Aberdeen SD
1005 PM MDT TUE JUL 3 2018

SDZ003-040445-
Corson SD-
1005 PM MDT TUE JUL 3 2018

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN CORSON COUNTY UNTIL
1045 PM MDT...

At 1005 PM MDT, Doppler radar was tracking a strong thunderstorm over
northern Lake Oahe, or 9 miles northwest of Mobridge, moving north at
25 mph.

Nickel size hail and winds in excess of 30 mph will be possible with
this storm.

Locations impacted include...
Mclaughlin, Wakpala, Mahto and Indian Memorial Rec Area.

A Severe Thunderstorm Watch remains in effect until 400 AM MDT for
north central South Dakota.

LAT...LON 4558 10047 4555 10063 4581 10086 4588 10053
TIME...MOT...LOC 0405Z 163DEG 21KT 4563 10059

Wise

Special weather statement, Jul 4, 12:02 AM CDT, 1 hour 5 minutes before

Special Weather Statement
National Weather Service Aberdeen SD
1202 AM CDT WED JUL 4 2018

SDZ004-005-009-010-040545-
Walworth SD-Campbell SD-McPherson SD-Edmunds SD-
1202 AM CDT WED JUL 4 2018

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN EDMUNDS...EASTERN
CAMPBELL...WESTERN MCPHERSON AND EASTERN WALWORTH COUNTIES UNTIL 1245
AM CDT...

At 1201 AM CDT, Doppler radar was tracking a strong thunderstorm near
Hosmer, or 14 miles south of Eureka, moving north at 55 mph.

Nickel size hail and winds in excess of 30 mph will be possible with
this storm.

Locations impacted include...
Eureka, Selby, Bowdle, Herreid, Roscoe, Hosmer, Java, Mound City,
Artas, Hillsview, Lake Hiddenwood Rec Area and Greenway.

A Severe Thunderstorm Watch remains in effect until 500 AM CDT for
north central South Dakota.

LAT...LON 4543 9933 4528 9995 4590 10015 4592 9940
TIME...MOT...LOC 0501Z 168DEG 46KT 4556 9958

Wise

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 3, 7:09 PM CDT	Special Weather Statement	ABR	Faulk	66 min
Jul 3, 7:14 PM CDT	Severe Thunderstorm Warning	ABR	Faulk, Hand	61 min
Jul 3, 8:14 PM CDT	Severe Thunderstorm Warning	ABR	Faulk, Hand	42 min
Jul 3, 8:21 PM CDT	Flash Flood Warning	ABR	Faulk, Hand	6 hr
Jul 3, 8:59 PM CDT	Special Weather Statement	ABR	Grant	46 min
Jul 3, 9:21 PM CDT	Special Weather Statement	ABR	Walworth	39 min
Jul 3, 9:37 PM CDT	Special Weather Statement	ABR	Faulk	53 min
Jul 3, 9:41 PM CDT	Severe Thunderstorm Warning	ABR	Faulk, Hand	43 min
Jul 3, 10:20 PM CDT	Severe Thunderstorm Warning	ABR	Faulk, Hand	40 min
Jul 3, 10:46 PM CDT	Special Weather Statement	ABR	Corson	44 min
Jul 3, 10:55 PM CDT	Severe Thunderstorm Warning	ABR	Edmunds, Faulk	50 min
Jul 3, 10:59 PM CDT	Severe Thunderstorm Warning	ABR	Corson	34 min
Jul 3, 11:05 PM CDT	Special Weather Statement	ABR	Corson	40 min
Jul 3, 11:45 PM CDT	Severe Thunderstorm Warning	ABR	Edmunds, Faulk	31 min
Jul 3, 11:51 PM CDT	Severe Thunderstorm Warning	ABR	Corson	39 min
Jul 4, 12:02 AM CDT	Special Weather Statement	ABR	Campbell	43 min
Jul 4, 12:25 AM CDT	Severe Thunderstorm Warning	ABR	Corson	50 min
Jul 4, 12:48 AM CDT	Severe Thunderstorm Warning	ABR	Dewey, Stanley	42 min
Jul 4, 12:50 AM CDT	Severe Thunderstorm Warning	ABR	Campbell	21 min
Jul 4, 12:55 AM CDT	Severe Thunderstorm Warning	ABR	Campbell, McPherson	50 min
Jul 4, 12:58 AM CDT	Tornado Warning	ABR	Dewey	21 min
Jul 4, 1:13 AM CDT	Severe Thunderstorm Warning	ABR	Dewey, Potter, Stanley, Sully	47 min
Jul 4, 1:31 AM CDT	Severe Thunderstorm Warning	ABR	Corson, Dewey	29 min
Jul 4, 1:42 AM CDT	Severe Thunderstorm Warning	ABR	Campbell, Corson, Dewey, Potter, Sully, Walworth	48 min
Jul 4, 1:51 AM CDT	Flash Flood Warning	ABR	Campbell, Corson	6 hr
Jul 4, 1:58 AM CDT	Severe Thunderstorm Warning	ABR	Campbell, Corson, Dewey, Walworth	47 min
Jul 4, 2:08 AM CDT	Areal Flood Warning	ABR	Faulk, Hand	11 hr
Jul 4, 2:10 AM CDT	Severe Thunderstorm Warning	ABR	Campbell, Edmunds, Faulk, Hyde, McPherson, Potter and 2 more	50 min
Jul 4, 2:43 AM CDT	Severe Thunderstorm Warning	ABR	Edmunds, Faulk, McPherson	47 min
Jul 4, 3:15 AM CDT	Severe Thunderstorm Warning	ABR	Brown, McPherson	30 min
Jul 4, 3:41 AM CDT	Special Weather Statement	ABR	Brown, Spink	34 min
Jul 4, 4:50 AM CDT	Special Weather Statement	ABR	Clark, Codington, Day, Grant, Hamlin, Roberts	40 min
Jul 4, 7:15 AM CDT	Areal Flood Warning	ABR	Corson	6 hr
Jul 4, 1:15 PM CDT	Areal Flood Warning	ABR	Corson	13 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.