Alert archive / Minnesota / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 257, NWS Sioux Falls, SD

September 19, 20176 counties in Minnesota; Brookings County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Sep 19, 2017, 11:47 PM CDT for 6 counties in Minnesota; Brookings County, South Dakota. It was in force for 43 min. 5 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: Sep 19, 2017, 11:47 PM CDT (04:47 UTC)
Expired: Sep 20, 2017, 12:30 AM CDT
In force: 43 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 70.0 mph

Counties Lincoln County, MN, Lyon County, MN, Murray County, MN, Nobles County, MN, Pipestone County, MN, Rock County, MN, Brookings County, SD

The radar

The Sioux Falls radar (KFSD), 71 km from the middle of the area, began a volume at 04:48 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
Sep 19, 11:55 PM CDT	TSTM WND DMG	4 Ene Steen, MN	LARGE TREE DOWN ON CAR.
Sep 19, 11:55 PM CDT	TSTM WND GST 58	1 Wsw Beaver Creek, MN	MNDOT RWIS SITE AT BEAVER CREEK.
Sep 19, 11:59 PM CDT	TSTM WND DMG	4 Ene Steen, MN	TREE DOWNED ONTO CAR. REPORT VIA SOCIAL MEDIA. TIME ESTIMATED FROM RADAR.
Sep 20, 12:02 AM CDT	TSTM WND GST 68	2 S Luverne, MN
Sep 20, 12:11 AM CDT	TSTM WND DMG	Balaton, MN	TREES DOWN IN BALATON. REPORT VIA SOCIAL MEDIA.

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 5 storm reports to this severe thunderstorm warning; the first came 8 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
Sep 19, 10:36 PM CDT	Severe Thunderstorm Watch	SPC	4 hr
Sep 19, 3:37 PM CDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 4.8 hours before the alert went out and 212 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: 2563 J/kg
Mixed-layer CIN: -16 J/kg
Mixed-layer LCL: 1127 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 229 m²/s²
0-3 km storm-relative helicity: 239 m²/s²
Significant tornado parameter: 2.6
Supercell composite: 16.8

Open this sounding in Storm Lab

The text

As transmitted.

316 
WUUS53 KFSD 200447
SVRFSD
MNC081-083-101-105-117-133-SDC011-200530-
/O.NEW.KFSD.SV.W.0257.170920T0447Z-170920T0530Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Sioux Falls SD
1147 PM CDT TUE SEP 19 2017

The National Weather Service in Sioux Falls has issued a

* Severe Thunderstorm Warning for...
  Southwestern Lyon County in southwestern Minnesota...
  Rock County in southwestern Minnesota...
  Southern Lincoln County in southwestern Minnesota...
  Western Nobles County in southwestern Minnesota...
  Pipestone County in southwestern Minnesota...
  Western Murray County in southwestern Minnesota...
  East central Brookings County in east central South Dakota...

* Until 1230 AM CDT

* At 1147 PM CDT, severe thunderstorms were located along a line
  extending from near Elkton to near Jasper to near Larchwood, moving
  east at 45 mph.

  HAZARD...70 mph wind gusts. 

  SOURCE...Radar indicated. 

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

* Severe thunderstorms will be near, 
  Lake Benton, Hardwick, Trosky and Blue Mounds State Park around 
  1200 AM CDT. 
  Luverne, Edgerton and Arco around 1205 AM CDT. 
  Tyler and Florence around 1210 AM CDT. 
  Ellsworth and Leota around 1215 AM CDT. 
  Adrian, Russell and Chandler around 1220 AM CDT. 
  Camden State Park around 1225 AM CDT. 
  Marshall, Slayton and Rushmore around 1230 AM CDT. 

Other locations impacted by these severe thunderstorms include
Kenneth, Ihlen, Lynd, Hadley, Garvin, Steen, Iona, Magnolia and
Hatfield.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

A tornado watch remains in effect until midnight CDT for east central
South Dakota.

LAT...LON 4447 9578 4393 9570 4350 9574 4350 9645
      4379 9643 4433 9647
TIME...MOT...LOC 0447Z 256DEG 41KT 4426 9645 4380 9640 4352 9644 

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

Hanko

3 follow-up statements

266 
WWUS53 KFSD 200501
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
1201 AM CDT WED SEP 20 2017

MNC081-083-101-105-117-133-SDC011-200530-
/O.CON.KFSD.SV.W.0257.000000T0000Z-170920T0530Z/
Lyon MN-Rock MN-Lincoln MN-Nobles MN-Pipestone MN-Murray MN-
Brookings SD-
1201 AM CDT WED SEP 20 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1230 AM CDT
FOR SOUTHWESTERN LYON...ROCK...SOUTHERN LINCOLN...WESTERN NOBLES...
PIPESTONE...WESTERN MURRAY AND EAST CENTRAL BROOKINGS COUNTIES...

At 1158 PM CDT, severe thunderstorms were located along a line
extending from Lake Benton to near Trosky to near Hills, moving east
at 45 mph.

HAZARD...70 mph wind gusts. 

SOURCE...Radar indicated. At 1155 pm CDT 58 mph wind gust was 
         reported at Beaver Creek. 

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

These severe storms will be near...
  Edgerton and Arco around 1205 AM CDT. 
  Tyler and Florence around 1210 AM CDT. 
  Ellsworth and Leota around 1215 AM CDT. 
  Adrian, Russell and Chandler around 1220 AM CDT. 
  Camden State Park around 1225 AM CDT. 
  Marshall, Slayton and Rushmore around 1230 AM CDT. 

Other locations impacted by these severe thunderstorms include
Kenneth, Ihlen, Lynd, Hadley, Garvin, Steen, Iona, Magnolia and
Hatfield.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4447 9578 4393 9570 4350 9574 4350 9645
      4379 9643 4433 9647
TIME...MOT...LOC 0458Z 256DEG 41KT 4429 9630 4383 9625 4355 9629 

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

Hanko

129 
WWUS53 KFSD 200513
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
1213 AM CDT WED SEP 20 2017

SDC011-200522-
/O.CAN.KFSD.SV.W.0257.000000T0000Z-170920T0530Z/
Brookings SD-
1213 AM CDT WED SEP 20 2017

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL BROOKINGS COUNTY
IS CANCELLED...

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

LAT...LON 4447 9578 4393 9570 4350 9574 4350 9626
      4386 9614 4439 9619
TIME...MOT...LOC 0512Z 257DEG 53KT 4433 9607 4387 9599 4359 9607 

$$

MNC081-083-101-105-117-133-200530-
/O.CON.KFSD.SV.W.0257.000000T0000Z-170920T0530Z/
Lyon MN-Rock MN-Lincoln MN-Nobles MN-Pipestone MN-Murray MN-
1213 AM CDT WED SEP 20 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1230 AM CDT
FOR SOUTHWESTERN LYON...EASTERN ROCK...SOUTHEASTERN LINCOLN...WESTERN
NOBLES...EASTERN PIPESTONE AND WESTERN MURRAY COUNTIES...

At 1212 AM CDT, severe thunderstorms were located along a line
extending from near Tyler to near Leota to near Ellsworth, moving
east at 60 mph.

HAZARD...70 mph wind gusts. 

SOURCE...Radar indicated. 

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

These severe storms will be near...
  Russell and Camden State Park around 1220 AM CDT. 
  Slayton and Rushmore around 1225 AM CDT. 
  Marshall around 1230 AM CDT. 

Other locations impacted by these severe thunderstorms include
Kenneth, Lynd, Hadley, Garvin, Iona, Magnolia and Steen.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This is a DANGEROUS SITUATION. These storms have produced wind 
damage. SEEK SHELTER NOW inside a sturdy structure and stay away 
from windows.
 
&&

LAT...LON 4447 9578 4393 9570 4350 9574 4350 9626
      4386 9614 4439 9619
TIME...MOT...LOC 0512Z 257DEG 53KT 4433 9607 4387 9599 4359 9607 

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

Hanko

773 
WWUS53 KFSD 200529
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
1229 AM CDT WED SEP 20 2017

MNC081-083-101-105-117-133-200539-
/O.EXP.KFSD.SV.W.0257.000000T0000Z-170920T0530Z/
Lyon MN-Rock MN-Lincoln MN-Nobles MN-Pipestone MN-Murray MN-
1229 AM CDT WED SEP 20 2017

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN LYON...EASTERN
ROCK...SOUTHEASTERN LINCOLN...WESTERN NOBLES...EASTERN PIPESTONE AND
WESTERN MURRAY COUNTIES WILL EXPIRE AT 1230 AM CDT...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore the warning will be allowed to expire.  However gusty winds
are still possible with these thunderstorms.

A severe thunderstorm watch remains in effect until 500 AM CDT for
southwestern Minnesota.

LAT...LON 4447 9578 4393 9570 4350 9574 4350 9626
      4386 9614 4439 9619
TIME...MOT...LOC 0529Z 270DEG 41KT 4437 9583 4391 9575 4363 9583 

$$

Hanko

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 Sep 19, 6:25 PM CDT, 5 hours 22 minutes earlier.

Area forecast discussion, Sep 19, 6:25 PM CDT, 5 hours 22 minutes before

Area Forecast Discussion
National Weather Service Sioux Falls SD
625 PM CDT Tue Sep 19 2017

.SHORT TERM...(This evening through Wednesday)
Issued at 313 PM CDT Tue Sep 19 2017

Obviously the main forecast concern tonight continues to be TSRA and
severe weather chances. In the near term, cannot rule out a few
showers with isolated thunderstorms late this afternoon and early
evening across our South Dakota zones, mainly along and north of I
90, and across the northern sections of southwest MN, north of I 90.
This is due to an increasing low level jet aiding lift with warm air
advection in the low levels coupled with thetae advection.

However later this evening and overnight still appears to be the
main event. Currently, water vapor imagery shows the short wave
moving into northeast WY. 120 knot jet streak is noted, as it moves
from western SD early tonight, to northwest MN after midnight. This
is coupled with strong PV following the same area, so therefore the
primary mid and upper wave is definitely shearing off to the
northeast as it follows the steering winds tonight. This is a big
reason why the highest pops, categorical and likely, are still
warranted generally north of Interstate 90, with rapidly decreasing
pops heading south of I 90. Soundings continue to show more capping
along and south of I 90, with a stout inversion in place through 1.5
km. North of I 90, the inversion weakens and dissipates in the
critical 1.0 to 1.5km layer which should aid in continuing convection
as it moves eastward into southwest MN late tonight.

Initially, discrete cells should form along the low level wind
shift, ahead of the short wave, early this evening in our far
western zones. They should quickly morph into a line involving QLCS
properties generally north of I 90, possibly oozing down to I 90
itself at times in the late evening hours and overnight. The severe
weather threat generally appears along and north of I 90. North of I
90, deep layer 0-6km shear of 50 to 60 knots exists, with a very
strongly veering profile and a 40 to 50 knot level jet. In addition,
0-3km bulk shear vectors are perpendicular to the forecast line and
at 35 knots, certainly give a hail and wind threat. The type of
severe weather will include all types, with large hail and QLCS
damaging wind, and even a tornado threat right along highway 14 from
Huron to De Smet SD in the mid evening hours. So this is certainly
something to watch. Otherwise again as state above, the further
south you go, the more the capping takes over with less dynamics.
But also cannot rule out severe weather very close to I 90 due to
very unstable mid layers. For temperatures, used a blend of ECMWF
bias corrected and superblend values. In addition, beefed up winds
out of the northwest just behind the wind shift to 20 to 30 mph for
a brief time.

.LONG TERM...(Wednesday night through Tuesday)
Issued at 313 PM CDT Tue Sep 19 2017

Surface high pressure across the Central into Northern Plains will
lead to a pleasant day across the area.  As flow turns southerly
Wednesday night into Thursday, will draw heat and humidity northward
into the Northern Plains.  Have raised forecast highs both Thursday
and Friday. GFS suggests near saturation between 800-900 mb Thursday
night, and with steep lapse rates aloft, model soundings are
convectively unstable.  This near saturation is not supported by the
NAM or ECMWF, so kept pops in the slight chance range Thursday
evening.

Better chances for precipitation on Friday night as leading waves
eject northeastward out of a very slow moving longitudinal trough.
With blocking pattern across the east due to the two tropical
systems off the east coast, have sided closer to the slower
evolution of the system this weekend.  Have raised temperatures on
Friday, and focused pops further to the west Friday night into
Saturday.  PWAT values are clouded through the weekend due to model
convection, but with nearly stalled boundary and PWATs of 1.50-
1.75", potential for heavy rain exists Saturday- Monday.

Cooler weather develops behind the trough early next week with 925
hpa temps falling into the upper single digits.  This should
temperatures slightly below normal into the middle of next week.

&&

.AVIATION...(For the 00Z TAFS through 00Z Wednesday evening)
Issued at 618 PM CDT Tue Sep 19 2017

Thunderstorms are expected to develop over central SD by 02Z and
sweep across the area overnight, affecting locales mainly along
and north of Interstate 90, including KHON and KFSD. Some of these
storms could be severe. Gusty southerly winds will transition to
northwesterly behind the front, briefly picking up with the
frontal passage. A low level jet ahead of the front will result in
low level wind shear at KSUX through 06Z. By later tonight all
sites will experience VFR conditions through the remainder of the
TAF period.

&&

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

SHORT TERM...MJ
LONG TERM...BT
AVIATION...JM

Hazardous weather outlook, Sep 19, 6:57 PM CDT, 4 hours 50 minutes before

Hazardous Weather Outlook
National Weather Service Sioux Falls SD
657 PM CDT Tue Sep 19 2017

IAZ001-002-MNZ071-072-080-081-089-090-097-098-SDZ038>040-052>062-
064>067-210000-
Lyon IA-Osceola-Lincoln MN-Lyon MN-Murray-Cottonwood-Nobles-
Jackson-Pipestone-Rock-Beadle-Kingsbury-Brookings-Jerauld-Sanborn-
Miner-Lake-Moody-Brule-Aurora-Davison-Hanson-McCook-Minnehaha-
Douglas-Hutchinson-Turner-Lincoln SD-
657 PM CDT Tue Sep 19 2017

This Hazardous Weather Outlook is for portions of northwest Iowa,
southwest Minnesota, central South Dakota, east central South
Dakota, south central South Dakota, and southeast South Dakota.

.DAY ONE...Tonight

Scattered thunderstorms will develop by this evening along a line
from Chamberlain to Huron, then progress with a frontal boundary
as it slides eastward through the overnight. Initially, storms
will be discrete with the risk of hail up to golf ball size, winds
to 70 mph, and even an isolated tornado. Storms should transition
during the later evening toward more linear or bowing structures,
with somewhat lesser hail size threat, but damaging wind
potential to around 80 mph along with a continued tornado threat
well after dark, even into southwest Minnesota toward midnight.

In general, the chance for storms increases heading farther north
from Interstate 90 this evening, with the greatest chances from
Huron to Marshall. This is a potential severe weather event much
more typical of July than September.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

Thunderstorm risks will return by Friday and continue into next
weekend. At this time, it is too early to determine the exact
location for a severe weather risk, but a few strong to severe
storms are likely during this period. An elevated heavy rainfall
risk will also be present from Friday night through Sunday.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is likely from 6 pm to 1 am for many areas north
of Interstate 90, and possible near and south of Interstate 90.

IAZ003-012>014-020>022-031-032-NEZ013-014-SDZ050-063-068>071-
210000-
Dickinson-Sioux-O'Brien-Clay IA-Plymouth-Cherokee-Buena Vista-
Woodbury-Ida-Dixon-Dakota-Gregory-Charles Mix-Bon Homme-Yankton-
Clay SD-Union-
657 PM CDT Tue Sep 19 2017

This Hazardous Weather Outlook is for portions of northwest Iowa,
west central Iowa, northeast Nebraska, south central South
Dakota, and southeast South Dakota.

.DAY ONE...Tonight

Risk for a few thunderstorms will begin toward south central
South Dakota by mid evening, spreading quickly eastward into
northwest Iowa in the early overnight hours. This is a very
conditional risk for severe weather, as any storms that manage to
develop as far south as the Missouri River corridor would have
potential for large hail and damaging winds.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

Thunderstorm chances return by later Friday and continue at times
through next weekend. The risk for severe storms remains somewhat
uncertain at this time, but there is likely the threat for some
areas of heavy rainfall.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is possible between 7 pm and 1 am tonight.

In the hours before

Local storm report, Sep 19, 10:00 PM CDT, 1 hour 47 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1000 PM CDT TUE SEP 19 2017

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

0956 PM     TSTM WND GST     2 N LAKE ANDES          43.19N 98.54W
09/19/2017  M53 MPH          CHARLES MIX        SD   TRAINED SPOTTER

&&

AK

Local storm report, Sep 19, 10:05 PM CDT, 1 hour 42 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1005 PM CDT TUE SEP 19 2017

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

1002 PM     TSTM WND GST     2 N MITCHELL            43.77N 98.03W
09/19/2017  M58 MPH          DAVISON            SD   ASOS

&&

FERGUSON

Local storm report, Sep 19, 10:56 PM CDT, 51 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1056 PM CDT TUE SEP 19 2017

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

1049 PM     TSTM WND GST     4 S SALEM               43.67N 97.39W
09/19/2017  M55 MPH          MCCOOK             SD   EMERGENCY MNGR

&&

FERGUSON

Local storm report, Sep 19, 11:23 PM CDT, 24 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1123 PM CDT TUE SEP 19 2017

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

1051 PM     TSTM WND DMG     SALEM                   43.73N 97.39W
09/19/2017                   MCCOOK             SD   STORM CHASER

            STORM CHASER STREAM SHOWED LOTS OF TREE
            DAMAGE IN SALEM.

&&

AK

Local storm report, Sep 19, 11:37 PM CDT, 10 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1137 PM CDT TUE SEP 19 2017

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

1127 PM     TSTM WND GST     3 N SIOUX FALLS         43.58N 96.74W
09/19/2017  M60 MPH          MINNEHAHA          SD   ASOS

            OBSERVED AT SIOUX FALLS AIRPORT.

&&

AK

Local storm report, Sep 19, 11:44 PM CDT, 3 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1144 PM CDT TUE SEP 19 2017

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

1109 PM     TSTM WND DMG     3 SW WENTWORTH          43.96N 97.01W
09/19/2017                   LAKE               SD   TRAINED SPOTTER

            GARAGE DOORS BLOWN IN....TREE BRANCHES DOWN
            ALL AROUND LAKE MADISON. TIME ESTIMATED FROM
            RADAR.

&&

FERGUSON

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 19, 11:08 PM CDT	Severe Thunderstorm Warning	FSD	Pipestone, Rock	52 min
Sep 19, 11:29 PM CDT	Severe Thunderstorm Warning	FSD	Nobles, Pipestone, Rock	46 min
Sep 19, 7:59 PM CDT	Severe Thunderstorm Warning	FSD	Beadle	31 min
Sep 19, 8:08 PM CDT	Tornado Warning	FSD	Beadle	22 min
Sep 19, 8:38 PM CDT	Severe Thunderstorm Warning	FSD	Aurora, Beadle, Jerauld, Sanborn	52 min
Sep 19, 8:53 PM CDT	Severe Thunderstorm Warning	FSD	Aurora, Brule	52 min
Sep 19, 8:57 PM CDT	Severe Thunderstorm Warning	FSD	Gregory	48 min
Sep 19, 9:17 PM CDT	Tornado Warning	FSD	Aurora, Brule	28 min
Sep 19, 9:21 PM CDT	Severe Thunderstorm Warning	FSD	Beadle, Jerauld, Kingsbury, Miner, Sanborn	39 min
Sep 19, 9:41 PM CDT	Severe Thunderstorm Warning	FSD	Aurora, Davison, Hanson, Sanborn	49 min
Sep 19, 9:55 PM CDT	Severe Thunderstorm Warning	FSD	Beadle, Kingsbury, Miner, Sanborn	46 min
Sep 19, 10:00 PM CDT	Severe Thunderstorm Warning	FSD	Aurora, Davison, Douglas, Hanson, Hutchinson	45 min
Sep 19, 10:15 PM CDT	Severe Thunderstorm Warning	FSD	Kingsbury, Lake, Miner, Sanborn	45 min
Sep 19, 10:39 PM CDT	Severe Thunderstorm Warning	FSD	Hanson, Kingsbury, Lake, McCook, Miner, Minnehaha and 1 more	36 min
Sep 19, 11:04 PM CDT	Tornado Warning	FSD	Lake, McCook, Minnehaha, Moody	26 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2017 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.