Alert archive / South Dakota / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 147, NWS Aberdeen, SD

July 4, 20188 counties in South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Jul 4, 2018, 2:10 AM CDT for 8 counties in South Dakota. It was in force for 50 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, 2:10 AM CDT (07:10 UTC)
Expired: Jul 4, 2018, 3:00 AM CDT
In force: 50 min
Issued by: NWS Aberdeen, SD
Area: Storm-based polygon
Hail: 0.75 in
Wind: 90.0 mph

Counties Campbell County, SD, Edmunds County, SD, Faulk County, SD, Hyde County, SD, McPherson County, SD, Potter County, SD, Sully County, SD, Walworth County, SD

The radar

The Aberdeen radar (KABR), 137 km from the middle of the area, began a volume at 07:12 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, 2:24 AM CDT	TSTM WND DMG	Herreid, SD	MATURE TREE BLOWN OVER. REPORT VIA SOCIAL MEDIA.
Jul 4, 2:45 AM CDT	TSTM WND DMG	11 Ne Eureka, SD	VERY STRONG WINDS RIPPED SMALL SECTIONS OF SIDING OF THE HOUSE.
Jul 4, 2:45 AM CDT	TSTM WND GST 96	10 W Long Lake, SD	SAND LAKE RAWS - TIME ESTIMATED.

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 4 storm reports to this severe thunderstorm warning; the first came 14 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
Jul 3, 11:02 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 00:00Z, 7.2 hours before the alert went out and 145 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.

279 
WUUS53 KABR 040710
SVRABR
SDC021-045-049-069-089-107-119-129-040800-
/O.NEW.KABR.SV.W.0147.180704T0710Z-180704T0800Z/

BULLETIN - EAS ACTIVATION REQUESTED
Severe Thunderstorm Warning
National Weather Service Aberdeen SD
210 AM CDT WED JUL 4 2018

The National Weather Service in Aberdeen has issued a

* Severe Thunderstorm Warning for...
  Western Edmunds County in north central South Dakota...
  Northeastern Sully County in central South Dakota...
  Northern Hyde County in central South Dakota...
  Western Faulk County in north central South Dakota...
  Campbell County in north central South Dakota...
  Potter County in north central South Dakota...
  Western McPherson County in north central South Dakota...
  Walworth County in north central South Dakota...

* Until 300 AM CDT.

* At 210 AM CDT, severe thunderstorms were located along a line
  extending from near Pollock to near Lowry to near Gorman, moving
  northeast at 65 mph.

  These are very dangerous storms.

  HAZARD...90 mph wind gusts.

  SOURCE...Trained weather spotters.

  IMPACT...You are in a life-threatening situation. Flying debris 
           may be deadly to those caught without shelter. Mobile 
           homes will be heavily damaged or destroyed. Homes and 
           businesses will have substantial roof and window damage. 
           Expect extensive tree damage and power outages.

* Locations impacted include...
  Mobridge, Gettysburg, Eureka, Onida, Selby, Bowdle, Herreid, Hoven,
  Roscoe, Pollock, Hosmer, Java, Glenham, Agar, Mound City, Lebanon,
  Akaska, Seneca, Tolstoy and Onaka.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This is an EXTREMELY DANGEROUS SITUATION with tornado like wind
speeds expected. Mobile homes and high profile vehicles are
especially susceptible to winds of this magnitude and may be
overturned. For your protection move to an interior room on the
lowest floor of a building. These storms have the potential to cause
serious injury and significant property damage.

&&

LAT...LON 4594 9931 4482 9932 4464 10032 4523 10026
      4533 10031 4539 10028 4550 10036 4552 10047
      4555 10049 4558 10043 4565 10041 4566 10033
      4571 10031 4587 10039 4594 10049
TIME...MOT...LOC 0710Z 203DEG 56KT 4587 10027 4540 9998 4491 10001 

HAIL...<.75IN
WIND...90MPH
 
$$

Connelly

2 follow-up statements

871 
WWUS53 KABR 040727
SVSABR

Severe Weather Statement
National Weather Service Aberdeen SD
227 AM CDT WED JUL 4 2018

SDC069-119-040736-
/O.CAN.KABR.SV.W.0147.000000T0000Z-180704T0800Z/
Sully SD-Hyde SD-
227 AM CDT WED JUL 4 2018

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN SULLY AND
NORTHERN HYDE COUNTIES IS CANCELLED...

The storms which prompted the warning have weakened and moved out of 
the warned area. Therefore, the warning has been cancelled.

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

LAT...LON 4495 9932 4494 9977 4522 9981 4540 9996
      4557 10016 4566 10033 4571 10031 4587 10039
      4594 10049 4594 9931
TIME...MOT...LOC 0726Z 203DEG 56KT 4608 10015 4561 9986 4512 9989 

$$

SDC021-045-049-089-107-129-040800-
/O.CON.KABR.SV.W.0147.000000T0000Z-180704T0800Z/
Edmunds SD-Faulk SD-Campbell SD-Potter SD-McPherson SD-Walworth SD-
227 AM CDT WED JUL 4 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 AM CDT
FOR WESTERN EDMUNDS...WESTERN FAULK...CAMPBELL...EASTERN POTTER...
WESTERN MCPHERSON AND EASTERN WALWORTH COUNTIES...

At 226 AM CDT, severe thunderstorms were located along a line
extending from near Strasburg to 7 miles north of Java to 6 miles
northwest of Lebanon, moving northeast at 65 mph.

These are very dangerous storms.

HAZARD...90 mph wind gusts.

SOURCE...Trained weather spotters.

IMPACT...You are in a life-threatening situation. Flying debris may 
         be deadly to those caught without shelter. Mobile homes 
         will be heavily damaged or destroyed. Homes and businesses 
         will have substantial roof and window damage. Expect 
         extensive tree damage and power outages.

Locations impacted include...
Eureka, Selby, Bowdle, Herreid, Hoven, Roscoe, Pollock, Hosmer, Java,
Mound City, Lebanon, Seneca, Tolstoy, Onaka, Artas, Hillsview, Lake
Hiddenwood Rec Area, Greenway and New Town Corner.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This is an EXTREMELY DANGEROUS SITUATION with tornado like wind
speeds expected. Mobile homes and high profile vehicles are
especially susceptible to winds of this magnitude and may be
overturned. For your protection move to an interior room on the
lowest floor of a building. These storms have the potential to cause
serious injury and significant property damage.

&&

LAT...LON 4495 9932 4494 9977 4522 9981 4540 9996
      4557 10016 4566 10033 4571 10031 4587 10039
      4594 10049 4594 9931
TIME...MOT...LOC 0726Z 203DEG 56KT 4608 10015 4561 9986 4512 9989 

HAIL...<.75IN
WIND...90MPH
 
$$

Connelly

066 
WWUS53 KABR 040759
SVSABR

Severe Weather Statement
National Weather Service Aberdeen SD
259 AM CDT WED JUL 4 2018

SDC021-045-049-089-107-129-040809-
/O.EXP.KABR.SV.W.0147.000000T0000Z-180704T0800Z/
Edmunds SD-Faulk SD-Campbell SD-Potter SD-McPherson SD-Walworth SD-
259 AM CDT WED JUL 4 2018

...THE SEVERE THUNDERSTORM WARNING FOR WESTERN EDMUNDS...WESTERN
FAULK...CAMPBELL...EASTERN POTTER...WESTERN MCPHERSON AND EASTERN
WALWORTH COUNTIES WILL EXPIRE AT 300 AM CDT...
    
The storms which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire.

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

LAT...LON 4495 9932 4494 9977 4522 9981 4540 9996
      4557 10016 4566 10033 4571 10031 4587 10039
      4594 10049 4594 9931
TIME...MOT...LOC 0759Z 203DEG 56KT 4654 9987 4607 9958 4558 9961 

$$

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, 1 hour 41 minutes earlier.

Area forecast discussion, Jul 4, 12:29 AM CDT, 1 hour 41 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, 12 hours 47 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 4, 12:02 AM CDT, 2 hours 8 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

Local storm report, Jul 4, 1:12 AM CDT, 58 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
112 AM CDT WED JUL 4 2018

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

0108 AM     TSTM WND GST     1 NE HAYES              44.38N 101.01W
07/04/2018  M58 MPH          STANLEY            SD   MESONET

&&

SD

Local storm report, Jul 4, 1:24 AM CDT, 46 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
124 AM CDT WED JUL 4 2018

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

0100 AM     TSTM WND GST     14 NNW SANSARC          44.69N 101.14W
07/04/2018  M62 MPH          STANLEY            SD   MESONET

            SDDOT SITE FOSTER BAY.

&&

SD

Local storm report, Jul 4, 1:29 AM CDT, 41 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
129 AM CDT WED JUL 4 2018

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

0109 AM     TSTM WND GST     4 NNE EAGLE BUTTE       45.05N 101.21W
07/04/2018  M70 MPH          DEWEY              SD   MESONET

&&

SD

Local storm report, Jul 4, 2:02 AM CDT, 8 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
202 AM CDT WED JUL 4 2018

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

0155 AM     TSTM WND GST     2 E MOBRIDGE            45.54N 100.40W
07/04/2018  M95 MPH          WALWORTH           SD   ASOS

&&

SD

Local storm report, Jul 4, 2:05 AM CDT, 5 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
205 AM CDT WED JUL 4 2018

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

0159 AM     TSTM WND GST     2 WSW GLENHAM           45.52N 100.31W
07/04/2018  M79 MPH          WALWORTH           SD   MESONET

&&

SD

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, 1:07 AM CDT	Severe Thunderstorm Warning	ABR	Campbell, Corson, Dewey, Walworth	38 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, 2:43 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.