Alert archive / South Dakota / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 182, NWS Aberdeen, SD

August 25, 20174 counties in South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Aug 25, 2017, 6:03 PM CDT for 4 counties in South Dakota. It was in force for 42 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 25, 2017, 6:03 PM CDT (23:03 UTC)
Expired: Aug 25, 2017, 6:45 PM CDT
In force: 42 min
Issued by: NWS Aberdeen, SD
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 70.0 mph

Counties Codington County, SD, Day County, SD, Deuel County, SD, Grant County, SD

The radar

The Aberdeen radar (KABR), 117 km from the middle of the area, began a volume at 23:07 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.

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 nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 11.1 hours before the alert went out and 110 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: 742 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 36 m²/s²
0-3 km storm-relative helicity: 134 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

791 
WUUS53 KABR 252303
SVRABR
SDC029-037-039-051-252345-
/O.NEW.KABR.SV.W.0182.170825T2303Z-170825T2345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Aberdeen SD
603 PM CDT FRI AUG 25 2017

The National Weather Service in Aberdeen has issued a

* Severe Thunderstorm Warning for...
  Northwestern Deuel County in northeastern South Dakota...
  Southeastern Day County in northeastern South Dakota...
  Grant County in northeastern South Dakota...
  Northern Codington County in northeastern South Dakota...

* Until 645 PM CDT

* At 602 PM CDT, a severe thunderstorm was located near Dakota Sioux
  Casino, or 12 miles north of Watertown, moving east at 50 mph.

  HAZARD...70 mph wind gusts. 

  SOURCE...Radar indicated. 

  IMPACT...Expect considerable tree damage. Damage is likely to 
           mobile homes, roofs, and outbuildings. 

* Locations impacted include...
  Watertown, Milbank, Florence, Rauville, South Shore, Waverly,
  Revillo, Stockholm, Strandburg, Twin Brooks, La Bolt, Troy, Albee,
  Medicine Lake, Grass Lake, Dakota Sioux Casino and Long Lake.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Intense thunderstorm lines can produce brief tornadoes and widespread
significant wind damage. Although a tornado is not immediately
likely, it is best to move to an interior room on the lowest floor of
a building. This storm may cause serious injury and significant
property damage.

&&

LAT...LON 4494 9739 4524 9738 4525 9648 4498 9647
TIME...MOT...LOC 2302Z 270DEG 42KT 4508 9719 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...70MPH
 
$$

Scarlett

2 follow-up statements

411 
WWUS53 KABR 252324
SVSABR

Severe Weather Statement
National Weather Service Aberdeen SD
624 PM CDT FRI AUG 25 2017

SDC037-252334-
/O.CAN.KABR.SV.W.0182.000000T0000Z-170825T2345Z/
Day SD-
624 PM CDT FRI AUG 25 2017

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN DAY COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 4496 9698 4524 9700 4525 9648 4498 9647
TIME...MOT...LOC 2324Z 270DEG 42KT 4508 9682 

$$

SDC029-039-051-252345-
/O.CON.KABR.SV.W.0182.000000T0000Z-170825T2345Z/
Deuel SD-Grant SD-Codington SD-
624 PM CDT FRI AUG 25 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM CDT
FOR NORTHWESTERN DEUEL...SOUTHEASTERN GRANT AND NORTHEASTERN
CODINGTON COUNTIES...

At 624 PM CDT, a severe thunderstorm was located over Stockholm, or
13 miles southwest of Milbank, moving east at 50 mph.

HAZARD...60 mph wind gusts. 

SOURCE...Radar indicated. 

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

Locations impacted include...
Milbank, South Shore, Waverly, Revillo, Stockholm, Strandburg, Twin
Brooks, La Bolt, Troy and Albee.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4496 9698 4524 9700 4525 9648 4498 9647
TIME...MOT...LOC 2324Z 270DEG 42KT 4508 9682 

HAIL...<.75IN
WIND...60MPH
 
$$

Scarlett

444 
WWUS53 KABR 252342
SVSABR

Severe Weather Statement
National Weather Service Aberdeen SD
642 PM CDT FRI AUG 25 2017

SDC029-039-051-252352-
/O.EXP.KABR.SV.W.0182.000000T0000Z-170825T2345Z/
Deuel SD-Grant SD-Codington SD-
642 PM CDT FRI AUG 25 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN DEUEL...
SOUTHEASTERN GRANT AND NORTHEASTERN CODINGTON COUNTIES WILL EXPIRE AT
645 PM 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.

LAT...LON 4496 9698 4524 9700 4525 9648 4498 9647
TIME...MOT...LOC 2342Z 270DEG 42KT 4508 9656 

$$

Scarlett

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 25, 3:02 PM CDT, 3 hours 1 minute earlier.

Area forecast discussion, Aug 25, 3:02 PM CDT, 3 hours 1 minute before

Area Forecast Discussion
National Weather Service Aberdeen SD
302 PM CDT Fri Aug 25 2017

.SHORT TERM...(This Evening through Saturday Afternoon)
Issued at 259 PM CDT Fri Aug 25 2017

Severe storms and heavy rainfall this afternoon through tonight will
be the main forecast concerns.

An upper level trough and surface front currently over the western
Dakotas will continue progressing eastward through this afternoon. A
few strong storms are ongoing over the western half of the CWA.
Radar suggests small hail and locally heavy rainfall is occurring
with a few storms.

Elsewhere, a surface low pressure system is located over south
central SD and into north central NE. The warm front extends into
eastern South Dakota where dew points reach the mid 60s, with higher
values further south. This area has seen some sunshine today and is
prime for severe storms this afternoon through this evening. While
deep layer shear is lacking some, 0-1 km bulk shear values exceed 20
knots. As the low moves eastward, thunderstorms should develop out
ahead in a highly unstable environment were SBCAPE values exceed 3K
J/KG. Rapid thunderstorm develop is possible in central SD, or
around the Miller, Huron, Mitchell, Kennebec area. Theses storms
should become severe with hail and damaging winds possible. An
isolated tornado will also be possible based on the low level wind
shear. While cape values wane after sunset, a 30-45 knot llj will
keep thunderstorms ongoing through the overnight hours. Damaging
winds will become the main threat after 3Z.

High values of PWATS, along with a very slow storm motion with some
thunderstorms will set the stage for locally heavy rainfall. Will
mention a small area of heavy rain in east central SD where the warm
front will interact with the LLJ. Rainfall amounts of 2+ inches will
be possible. Thunderstorms should push into MN during the morning
hours on Saturday with dry conditions possible for most areas.

With an abundance of low level moisture and light winds behind this
system, areas of fog will be possible for locations west of the
James Valley late tonight/Saturday morning.

.LONG TERM...(Saturday Evening through Friday)
Issued at 259 PM CDT Fri Aug 25 2017

No major changes to the extended forecast. The medium range models
are in fair agreement of the mean ridge to be centered in the
western portion of the US with a northwest flow over the area. This
pattern looks mostly dry with seasonal temps expected. Some hints
that the ridge may break down by Friday, but still seven days out.

&&

.AVIATION...(For the 18Z TAFS through 18Z Saturday Afternoon)
Issued at 1239 PM CDT Fri Aug 25 2017

An area of low pressure will cross the region this afternoon
through tonight. This system will bring showers and thunderstorms
to all terminals in this CWA. The low pressure will also bring low
cigs in the IFR and MVFR categories. Flying conditions should
gradually improve from west to east on Saturday.

&&

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

SHORT TERM...SD
LONG TERM...Scarlett
AVIATION...SD

Hazardous weather outlook, Aug 25, 4:11 AM CDT, 13 hours 52 minutes before

Hazardous Weather Outlook
National Weather Service Aberdeen SD
411 AM CDT Fri Aug 25 2017

MNZ039-046-SDZ003>011-015>023-033>037-045-048-051-260915-
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-
411 AM CDT Fri Aug 25 2017 /311 AM MDT Fri Aug 25 2017/

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

Thunderstorms will be possible this afternoon, and should increase
in coverage and intensity tonight. Isolated strong to severe
storms will be possible, mainly late this afternoon into tonight.
Heavy rain will also be possible tonight, especially over eastern
and southeastern portions of South Dakota, and west central
Minnesota.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

Thunderstorms will remain possible over eastern South Dakota and
west central Minnesota Saturday. Severe weather is not expected at
this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed.

KF

In the hours before

Special weather statement, Aug 25, 2:27 PM CDT, 3 hours 36 minutes before

Special Weather Statement
National Weather Service Aberdeen SD
227 PM CDT FRI AUG 25 2017

SDZ009-010-016-017-034-036-037-252015-
Hand SD-Walworth SD-Sully SD-Hyde SD-Potter SD-Edmunds SD-Faulk SD-
227 PM CDT FRI AUG 25 2017

...SPECIAL WEATHER STATEMENT FOR SOUTHERN EDMUNDS...NORTHERN HAND...
NORTHEASTERN SULLY...NORTHERN HYDE...FAULK...POTTER AND EASTERN
WALWORTH COUNTIES UNTIL 315 PM CDT...

At 226 PM CDT, Doppler radar was tracking a strong thunderstorm 8
miles northeast of Stone Lake, or 17 miles east of Gettysburg, moving
northeast at 35 mph.

Half inch hail will be possible with this storm.

Locations impacted include...
Gettysburg, Faulkton, Onida, Bowdle, Hoven, Roscoe, Java, Cresbard,
Agar, Orient, Burdette, Lebanon, Seneca, Tolstoy, Rockham, Devoe,
Onaka, Lowry, Miranda and Brentwood Colony.

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 4465 10026 4552 9997 4540 9884 4467 9874
TIME...MOT...LOC 1926Z 240DEG 48KT 4495 9959

Scarlett

Special weather statement, Aug 25, 3:01 PM CDT, 3 hours 2 minutes before

Special Weather Statement
National Weather Service Aberdeen SD
301 PM CDT FRI AUG 25 2017

SDZ006-010-016>018-034-036-252045-
Spink SD-Brown SD-Sully SD-Hyde SD-Potter SD-Edmunds SD-Faulk SD-
301 PM CDT FRI AUG 25 2017

...SPECIAL WEATHER STATEMENT FOR SOUTHEASTERN EDMUNDS...NORTHEASTERN
SULLY...NORTHERN HYDE...SOUTHWESTERN BROWN...FAULK...POTTER AND
NORTHWESTERN SPINK COUNTIES UNTIL 345 PM CDT...

At 300 PM CDT, Doppler radar was tracking a strong thunderstorm near
Burkmere, or 10 miles west of Faulkton, moving northeast at 35 mph.

Half inch hail and winds in excess of 30 mph will be possible with
this storm.

Locations impacted include...
Aberdeen, Gettysburg, Ipswich, Faulkton, Warner, Mellette,
Northville, Westport, Cresbard, Agar, Athol, Orient, Lebanon, Seneca,
Tolstoy, Chelsea, Devoe, Onaka, Miranda and Mansfield.

These storms will be in the Aberdeen area by 400 PM CDT.

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.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 4569 9846 4506 9837 4489 9913 4490 9931
      4485 9932 4476 9973 4492 10041 4494 10042
TIME...MOT...LOC 2000Z 241DEG 38KT 4500 9933

Scarlett

Local storm report, Aug 25, 3:43 PM CDT, 2 hours 20 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
343 PM CDT FRI AUG 25 2017

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

0327 PM     HAIL             10 SSE LEBANON          44.94N 99.67W
08/25/2017  E0.75 INCH       POTTER             SD   PUBLIC

            DIME SIZE HAIL.

&&

KG

Special weather statement, Aug 25, 4:35 PM CDT, 1 hour 28 minutes before

Special Weather Statement
National Weather Service Aberdeen SD
435 PM CDT FRI AUG 25 2017

SDZ018-019-252215-
Clark SD-Spink SD-
435 PM CDT FRI AUG 25 2017

...SIGNIFICANT WEATHER ADVISORY FOR WESTERN CLARK AND EASTERN SPINK
COUNTIES UNTIL 515 PM CDT...

At 435 PM CDT, Doppler radar was tracking a strong thunderstorm over
Frankfort, or 10 miles east of Redfield, moving east at 40 mph.

Wind gusts up to 50 mph will be possible with this storm.

Locations impacted include...
Tulare, Doland, Frankfort, Raymond, Turton, Crocker, Fordham Colony,
Clark Colony, Spink Colony, Glendale Colony, Spottswood and Hillside
Colony.

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.

&&

A severe thunderstorm watch remains in effect until 1100 PM CDT for
northeastern South Dakota.

LAT...LON 4465 9853 4513 9846 4515 9762 4464 9789
TIME...MOT...LOC 2135Z 255DEG 35KT 4490 9831

Scarlett

Special weather statement, Aug 25, 4:44 PM CDT, 1 hour 19 minutes before

Special Weather Statement
National Weather Service Aberdeen SD
444 PM CDT FRI AUG 25 2017

SDZ037-252230-
Hand SD-
444 PM CDT FRI AUG 25 2017

...SIGNIFICANT WEATHER ADVISORY FOR EAST CENTRAL HAND COUNTY UNTIL
530 PM CDT...

At 444 PM CDT, Doppler radar was tracking a strong thunderstorm near
Vayland, or near Miller, moving east at 25 mph.

Winds in excess of 40 mph will be possible with this storm.

Locations impacted include...
Miller, St. Lawrence and Vayland.

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.

&&

A severe thunderstorm watch remains in effect until 1100 PM CDT for
central South Dakota.

LAT...LON 4439 9896 4457 9898 4466 9872 4431 9871
TIME...MOT...LOC 2144Z 264DEG 22KT 4449 9887

Scarlett

Special weather statement, Aug 25, 5:14 PM CDT, 49 minutes before

Special Weather Statement
National Weather Service Aberdeen SD
514 PM CDT FRI AUG 25 2017

SDZ011-018-019-252300-
Clark SD-Spink SD-Day SD-
514 PM CDT FRI AUG 25 2017

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN DAY...CLARK AND
EASTERN SPINK COUNTIES UNTIL 600 PM CDT...

At 514 PM CDT, Doppler radar was tracking a strong thunderstorm near
Crandall, or 18 miles northwest of Clark, moving east at 25 mph.

Wind gusts up to 50 mph will be possible with this storm.

Locations impacted include...
Webster, Clark, Doland, Bradley, Garden City, Raymond, Turton,
Butler, Lily, Mayfield Colony, Crandall, Crocker, Clark Colony, Swan
Lake, Fordham Colony, Hillcrest Colony and Hillside Colony.

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.

&&

A severe thunderstorm watch remains in effect until 1100 PM CDT for
northeastern South Dakota.

LAT...LON 4465 9752 4464 9831 4524 9805 4524 9798
      4534 9798 4534 9750
TIME...MOT...LOC 2214Z 270DEG 24KT 4512 9789

Scarlett

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 25, 10:42 AM CDT	Special Weather Statement	ABR	Dewey	48 min
Aug 25, 2:27 PM CDT	Special Weather Statement	ABR	Edmunds, Faulk, Potter, Sully	48 min
Aug 25, 3:01 PM CDT	Special Weather Statement	ABR	Faulk, Potter	44 min
Aug 25, 3:14 PM CDT	Severe Thunderstorm Warning	ABR	Potter, Sully	46 min
Aug 25, 3:23 PM CDT	Severe Thunderstorm Warning	ABR	Faulk	52 min
Aug 25, 4:35 PM CDT	Special Weather Statement	ABR	Spink	40 min
Aug 25, 4:44 PM CDT	Special Weather Statement	ABR	Hand	46 min
Aug 25, 5:14 PM CDT	Special Weather Statement	ABR	Clark	46 min
Aug 25, 5:23 PM CDT	Severe Thunderstorm Warning	ABR	Clark, Codington, Day	52 min
Aug 25, 5:47 PM CDT	Severe Thunderstorm Warning	ABR	Lyman	43 min
Aug 25, 5:47 PM CDT	Tornado Warning	ABR	Clark, Codington, Day	12 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 2017 Every severe thunderstorm warning in 2017

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.