Alert archive / South Dakota / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 102, NWS Sioux Falls, SD

August 6, 2019Brule County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 6, 2019, 9:34 PM CDT for Brule County, South Dakota. It was in force for 41 min. 1 report 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 6, 2019, 9:34 PM CDT (02:34 UTC)
Expired: Aug 6, 2019, 10:15 PM CDT
In force: 41 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Tornado: Possible
Hail: 2.5 in
Wind: 70.0 mph

County Brule County, SD

The radar

The Aberdeen radar (KABR), 206 km from the middle of the area, began a volume at 02:34 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 6, 9:54 PM CDT	HAIL 1.75	5 S Chamberlain, SD	NICKEL UP TO GOLF BALL SIZED HAIL FELL.

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 one storm report to this severe thunderstorm warning; the first came 20 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 6, 8:19 PM CDT	Severe Thunderstorm Watch	SPC	9 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 2.6 hours before the alert went out and 150 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: 853 J/kg
Mixed-layer CIN: -94 J/kg
Mixed-layer LCL: 1947 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 143 m²/s²
0-3 km storm-relative helicity: 127 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 10.3

Open this sounding in Storm Lab

The text

As transmitted.

084 
WUUS53 KFSD 070234
SVRFSD
SDC015-070315-
/O.NEW.KFSD.SV.W.0102.190807T0234Z-190807T0315Z/

BULLETIN - EAS ACTIVATION REQUESTED
Severe Thunderstorm Warning
National Weather Service Sioux Falls SD
934 PM CDT Tue Aug 6 2019

The National Weather Service in Sioux Falls has issued a

* Severe Thunderstorm Warning for...
  Central Brule County in south central South Dakota...

* Until 1015 PM CDT.

* At 933 PM CDT, a severe thunderstorm was located near Dude Ranch,
  or 8 miles west of Chamberlain, moving southeast at 45 mph.

  HAZARD...Tennis ball size hail and 70 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...People and animals outdoors will be injured. Expect hail 
           damage to roofs, siding, windows, and vehicles. Expect 
           considerable tree damage. Wind damage is also likely to 
           mobile homes, roofs, and outbuildings.

* This severe thunderstorm will be near...
  Chamberlain and Lake Francis Case around 940 PM CDT.

Other locations impacted by this severe thunderstorm include Pukwana.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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 4370 9941 4377 9941 4380 9936 4386 9931
      4390 9936 4392 9936 4394 9929 4394 9923
      4371 9885 4350 9923 4350 9929 4353 9928
      4357 9934 4364 9936 4366 9938 4365 9945
      4367 9947
TIME...MOT...LOC 0233Z 329DEG 38KT 4386 9949 

TORNADO...POSSIBLE
HAIL...2.50IN
WIND...70MPH
 
$$

VandenBoogart

3 follow-up statements

463 
WWUS53 KFSD 070247
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
947 PM CDT Tue Aug 6 2019

SDC015-070315-
/O.CON.KFSD.SV.W.0102.000000T0000Z-190807T0315Z/
Brule SD-
947 PM CDT Tue Aug 6 2019

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1015 PM CDT
FOR WESTERN BRULE COUNTY...

At 946 PM CDT, a severe thunderstorm was located over Lake Francis
Case, or near Chamberlain, moving southeast at 40 mph.

HAZARD...Two inch hail and 70 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect 
         considerable tree damage. Wind damage is also likely to 
         mobile homes, roofs, and outbuildings.

This severe thunderstorm will remain over mainly rural areas of
western Brule County, including the following locations... Pukwana.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Prepare immediately for large hail and deadly cloud to ground
lightning. Seek shelter inside a well-built structure. Stay away from
windows.

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

&&

LAT...LON 4393 9934 4365 9896 4350 9923 4350 9929
      4353 9928 4357 9934 4364 9936 4366 9938
      4365 9945 4367 9947 4370 9941 4377 9941
      4380 9936 4386 9931 4390 9936 4392 9936
TIME...MOT...LOC 0246Z 325DEG 35KT 4377 9938 

TORNADO...POSSIBLE
HAIL...2.00IN
WIND...70MPH
 
$$

VandenBoogart

749 
WWUS53 KFSD 070257
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
957 PM CDT Tue Aug 6 2019

SDC015-070315-
/O.CON.KFSD.SV.W.0102.000000T0000Z-190807T0315Z/
Brule SD-
957 PM CDT Tue Aug 6 2019

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1015 PM CDT
FOR SOUTHWESTERN BRULE COUNTY...

At 956 PM CDT, a severe thunderstorm was located 8 miles southeast of
Lake Francis Case, or 9 miles south of Chamberlain, moving southeast
at 45 mph.

HAZARD...Ping pong 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...
Chamberlain and Lake Francis Case. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

&&

LAT...LON 4374 9941 4379 9927 4362 9902 4350 9923
      4350 9929 4353 9928 4357 9934 4364 9936
      4366 9938 4365 9945 4367 9947 4370 9941
TIME...MOT...LOC 0256Z 329DEG 38KT 4367 9930 

HAIL...1.50IN
WIND...60MPH
 
$$

VandenBoogart

819 
WWUS53 KFSD 070311
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
1011 PM CDT Tue Aug 6 2019

SDC015-070319-
/O.EXP.KFSD.SV.W.0102.000000T0000Z-190807T0315Z/
Brule SD-
1011 PM CDT Tue Aug 6 2019

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN BRULE COUNTY WILL
EXPIRE AT 1015 PM CDT...
    
This severe thunderstorm warning has expired. However, another 
Severe Thunderstorm Warning still remains in effect for portions of 
Brule county.

A Severe Thunderstorm Watch remains in effect until 300 AM CDT for
south central South Dakota.

LAT...LON 4374 9941 4379 9927 4362 9902 4350 9923
      4350 9929 4353 9928 4357 9934 4364 9936
      4366 9938 4365 9945 4367 9947 4370 9941
TIME...MOT...LOC 0309Z 329DEG 38KT 4356 9921 

$$

VandenBoogart

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 Sioux Falls, SD wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 6, 6:52 PM CDT, 2 hours 42 minutes earlier.

Area forecast discussion, Aug 6, 6:52 PM CDT, 2 hours 42 minutes before

AREA FORECAST DISCUSSION
National Weather Service Sioux Falls SD
652 PM CDT Tue Aug 6 2019

.SHORT TERM...(This Evening through Wednesday)
Issued at 306 PM CDT Tue Aug 6 2019

The atmosphere looks like it will get organized tonight and bring a
very good chance for severe weather. An upper level wave will move
from eastern MT into northern SD this evening and should spark
thunderstorm development in south central ND and north central SD
from about 22-0z. The area of development will likely see CAPE
values close to 2000 J/kg with good deep layer shear, likely 40 to
50 knots from the surface to 6 km. The latest model soundings show a
favorable environment across central and eastern SD as these storms
move southeast. While the instability upstream is decent the shear
will likely be a driving factor in maintaining the stronger updrafts
as well as new ones this evening. Areas from around the James Valley
west will see the higher instability and the better chance for large
hail. Later in the night, after about 5z, the threat should turn a
little more towards wind. A favorable shear profile with deep nearly
unidirectional winds suggest the potential for very strong winds.
The surface to 3 km bulk shear vector is oriented from about 330
degrees and should be favorable for a couple of QLCS tornadoes if
any component of the convection becomes linear. Time will tell but
at this time the highest threat for severe weather should be from
about 9 pm to 2 am CDT. As the storms shift east they will gradually
move away from the better instability so as they approach Interstate
29 there should be a downward trend in coverage and intensity late
tonight.

Some residual thunderstorm activity will be possible in northwest IA
on Wednesday morning but severe weather is not expected with this.
Skies will be partly cloudy as high pressure builds south and winds
turn to the north and northeast. Highs will be seasonally warm in
the lower to mid 80s with dew points in the 60s, so a touch humid.

.LONG TERM...(Wednesday Night through Tuesday)
Issued at 306 PM CDT Tue Aug 6 2019

There will be a small chance for thunderstorms near the Missouri
River Wednesday night which is near the low and mid level thermal
gradient and location of a weak upper level wave. Severe weather
looks unlikely. Temperatures will cool overnight with high pressure
building. Lows in the mid 50s near Brookings to lower 60s along the
Missouri River.

Thursday should prove to be another seasonally warm day with
temperatures a bit below normal. Upper level ridging will build
across the area and should keep conditions dry.

Friday night into Saturday will see this ridge break down a bit and
the chances for thunderstorms will return as a decent mid level wave
moves through. Warm advection will increase as the low level jet
increases and this should bring a round of thunderstorms to the
area. A few severe storms appear possible.

Flow remain favorable for both near to below normal temperatures as
well as occasional thunderstorm chances Sunday into Tuesday.

&&

.AVIATION...(For the 00Z TAFS through 00Z Wednesday evening)
Issued at 650 PM CDT Tue Aug 6 2019

High clouds will increase this evening as thunderstorms approach
from the northwest. During the late evening and early overnight,
several strong storms are possible west of a KHON to KMHE to KYKN
line, with heavy rain, large hail, and brief strong wind gusts up
to 50 kt. Storms move south of the area by the early morning
hours. Surface winds shift to northerly during the day Wednesday
as a weak cool front moves in.

&&

.FSD WATCHES/WARNINGS/ADVISORIES...
SD...NONE.
MN...NONE.
IA...NONE.
NE...NONE.
&&

SHORT TERM...08
LONG TERM...08
AVIATION...VandenBoogart

Hazardous weather outlook, Aug 6, 7:10 PM CDT, 2 hours 24 minutes before

Hazardous Weather Outlook
National Weather Service Sioux Falls SD
710 PM CDT Tue Aug 6 2019

SDZ038-039-050-052>054-057>061-063>065-068-069-080015-
Beadle-Kingsbury-Gregory-Jerauld-Sanborn-Miner-Brule-Aurora-Davison-
Hanson-McCook-Charles Mix-Douglas-Hutchinson-Bon Homme-Yankton-
710 PM CDT Tue Aug 6 2019

This Hazardous Weather Outlook is for central South Dakota, east
central South Dakota, south central South Dakota and southeast
South Dakota.

.DAY ONE...Tonight.

This is an enhanced risk of severe thunderstorms this evening into
the early overnight. A few of these storms may be capable of large
hail up to 2 inches in diameter and wind gusts up to 80 mph. The best
chance for these storms should is between 9 pm and 1 am CDT.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

Hazardous weather is not expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will likely be needed after 9 pm.

IAZ001-012-020-031-MNZ071-097-098-NEZ013-014-SDZ040-055-056-062-066-
067-070-071-080015-
Lyon-Sioux-Plymouth-Woodbury-Lincoln-Pipestone-Rock-Dixon-Dakota-
Brookings-Lake-Moody-Minnehaha-Turner-Clay-Union-
710 PM CDT Tue Aug 6 2019

This Hazardous Weather Outlook is for northwest Iowa, west central
Iowa, southwest Minnesota, northeast Nebraska, east central South
Dakota and southeast South Dakota.

.DAY ONE...Tonight.

A few thunderstorms will move into the Interstate 29 corridor after
11 pm CDT through 2 am CDT. An isolated storm could produce hail up to
the size of quarters and wind gusts up to 60 mph.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

Hazardous weather is not expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed.

IAZ002-003-013-014-021-022-032-MNZ072-080-081-089-090-080015-
Osceola-Dickinson-O'Brien-Clay-Cherokee-Buena Vista-Ida-Lyon-Murray-
Cottonwood-Nobles-Jackson-
710 PM CDT Tue Aug 6 2019

This Hazardous Weather Outlook is for northwest Iowa, west central
Iowa and southwest Minnesota.

.DAY ONE...Tonight.

A few thunderstorms are possible east of I-29 through the overnight
hours, with brief heavy rain and lightning being the primary threats.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

In the hours before

Local storm report, Aug 6, 8:58 PM CDT, 36 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
858 PM CDT TUE AUG 6 2019

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

0855 PM     HAIL             6 SSW CHAMBERLAIN       43.73N 99.35W
08/06/2019  M0.70 INCH       BRULE              SD   TRAINED SPOTTER

            LOTS OF PEA SIZED WITH SOME DIME SIZED HAIL.
            OTHERWISE JUST VERY HEAVY RAIN.

&&

AT

Local storm report, Aug 6, 9:01 PM CDT, 33 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
901 PM CDT TUE AUG 6 2019

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

0857 PM     HAIL             6 SSW CHAMBERLAIN       43.73N 99.35W
08/06/2019  M1.00 INCH       BRULE              SD   TRAINED SPOTTER

            HAIL STONES HAVE BEEN INCREASING IN SIZE
            OVER THE PAST 5 MINUTES.

&&

AT

Local storm report, Aug 6, 9:01 PM CDT, 33 minutes before

PRELIMINARY LOCAL STORM REPORT...CORRECTED TIME OF REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
901 PM CDT TUE AUG 6 2019

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

0900 PM     HAIL             6 SSW CHAMBERLAIN       43.73N 99.35W
08/06/2019  M1.00 INCH       BRULE              SD   TRAINED SPOTTER

            HAIL STONES HAVE BEEN INCREASING IN SIZE
            OVER THE PAST 5 MINUTES.

&&

AT

Local storm report, Aug 6, 9:02 PM CDT, 32 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
902 PM CDT TUE AUG 6 2019

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

0857 PM     HAIL             8 SSW CHAMBERLAIN       43.71N 99.38W
08/06/2019  M1.00 INCH       BRULE              SD   TRAINED SPOTTER

&&

AT

Local storm report, Aug 6, 9:13 PM CDT, 21 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
913 PM CDT TUE AUG 6 2019

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

0855 PM     HAIL             11 S CHAMBERLAIN        43.65N 99.32W
08/06/2019  M0.88 INCH       BRULE              SD   TRAINED SPOTTER

            REPORTED NICKEL SIZE HAIL BEFORE THE RAIN
            STARTED, THEN NOTHING BIGGER THAN PEA-SIZE
            SINCE THEN.

&&

AT

Local storm report, Aug 6, 9:33 PM CDT, 1 minute before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
933 PM CDT TUE AUG 6 2019

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

0928 PM     HAIL             18 S PUKWANA            43.52N 99.17W
08/06/2019  M1.00 INCH       BRULE              SD   TRAINED SPOTTER

&&

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 6, 8:15 PM CDT	Severe Thunderstorm Warning	FSD	Brule	45 min
Aug 6, 8:52 PM CDT	Severe Thunderstorm Warning	FSD	Brule, Charles Mix, Gregory	53 min
Aug 6, 9:34 PM CDT	Flash Flood Warning	FSD	Brule, Charles Mix	3 hr
Aug 6, 9:38 PM CDT	Severe Thunderstorm Warning	FSD	Charles Mix, Gregory	67 min
Aug 6, 10:04 PM CDT	Severe Thunderstorm Warning	FSD	Brule, Charles Mix, Gregory	41 min
Aug 6, 10:33 PM CDT	Severe Thunderstorm Warning	FSD	Gregory	42 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 2019 Every severe thunderstorm warning in 2019

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.