Tornado Warning 10, NWS Sioux Falls, SD

775 
WWUS53 KFSD 180035
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
735 PM CDT Sun May 17 2026

NEC043-180045-
/O.CAN.KFSD.TO.W.0010.000000T0000Z-260518T0115Z/
Dakota NE-
735 PM CDT Sun May 17 2026

...THE TORNADO WARNING FOR SOUTHEASTERN DAKOTA COUNTY IS CANCELLED...

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

A Tornado Watch remains in effect until 1000 PM CDT for west central
Iowa...and northeastern Nebraska.

&&

LAT...LON 4225 9634 4226 9633 4227 9636 4233 9638
      4256 9599 4256 9575 4247 9574 4247 9567
      4245 9567 4222 9632
TIME...MOT...LOC 0035Z 234DEG 47KT 4234 9624 

$$

IAC193-180115-
/O.CON.KFSD.TO.W.0010.000000T0000Z-260518T0115Z/
Woodbury IA-
735 PM CDT Sun May 17 2026

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 815 PM CDT FOR CENTRAL
WOODBURY COUNTY...

At 735 PM CDT, a confirmed tornado was located near Salix, or 13
miles southeast of Sioux City, moving northeast at 55 mph.

HAZARD...Damaging tornado and quarter size hail.

SOURCE...Emergency management confirmed tornado. At 731 PM, a 
         tornado was reported in Salix.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely.

This tornado will be near...
  Moville around 740 PM CDT.

Other locations in the path of this tornadic thunderstorm include
Pierson and Correctionville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a tornado is on the ground. TAKE COVER NOW! Move to a
basement or an interior room on the lowest floor of a sturdy
building. Avoid windows. If you are outdoors, in a mobile home, or in
a vehicle, move to the closest substantial shelter and protect
yourself from flying debris.

Heavy rainfall may hide this tornado. Do not wait to see or hear the
tornado. TAKE COVER NOW!

&&

LAT...LON 4225 9634 4226 9633 4227 9636 4233 9638
      4256 9599 4256 9575 4247 9574 4247 9567
      4245 9567 4222 9632
TIME...MOT...LOC 0035Z 234DEG 47KT 4234 9624 

TORNADO...OBSERVED
MAX HAIL SIZE...1.00 IN

$$

BP

840 
WWUS53 KFSD 180053
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
753 PM CDT Sun May 17 2026

IAC193-180115-
/O.CON.KFSD.TO.W.0010.000000T0000Z-260518T0115Z/
Woodbury IA-
753 PM CDT Sun May 17 2026

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 815 PM CDT FOR
NORTHEASTERN WOODBURY COUNTY...

At 751 PM CDT, a confirmed tornado was located over Moville, or 17
miles east of Sioux City, moving northeast at 45 mph.

HAZARD...Damaging tornado and quarter size hail.

SOURCE...Emergency management confirmed tornado. At 731 PM, a 
         tornado was reported in Salix.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely.

This tornado will be near...
  Pierson around 755 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a tornado is on the ground. TAKE COVER NOW! Move to a
basement or an interior room on the lowest floor of a sturdy
building. Avoid windows. If you are outdoors, in a mobile home, or in
a vehicle, move to the closest substantial shelter and protect
yourself from flying debris.

Heavy rainfall may hide this tornado. Do not wait to see or hear the
tornado. TAKE COVER NOW!

&&

LAT...LON 4240 9626 4256 9598 4256 9575 4248 9574
      4247 9573 4238 9596
TIME...MOT...LOC 0051Z 216DEG 40KT 4248 9604 

TORNADO...OBSERVED
MAX HAIL SIZE...1.00 IN

$$

BP

308 
WWUS53 KFSD 180101
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
801 PM CDT Sun May 17 2026

IAC193-180115-
/O.CON.KFSD.TO.W.0010.000000T0000Z-260518T0115Z/
Woodbury IA-
801 PM CDT Sun May 17 2026

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 815 PM CDT FOR
NORTHEASTERN WOODBURY COUNTY...

At 801 PM CDT, a severe squall line capable of producing both
tornadoes and extensive straight line wind damage was located over
Pierson, or 20 miles southwest of Cherokee, moving northeast at 60
mph.

HAZARD...Tornado and quarter size hail.

SOURCE...Radar indicated rotation.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely.

This tornadic thunderstorm will remain over mainly rural areas of
northeastern Woodbury County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 4256 9598 4256 9575 4251 9574 4244 9603
      4250 9609
TIME...MOT...LOC 0101Z 235DEG 50KT 4256 9588 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...1.00 IN

$$

BP

030 
WWUS53 KFSD 180115
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
815 PM CDT Sun May 17 2026

IAC193-180124-
/O.EXP.KFSD.TO.W.0010.000000T0000Z-260518T0115Z/
Woodbury IA-
815 PM CDT Sun May 17 2026

...THE TORNADO WARNING FOR NORTHEASTERN WOODBURY COUNTY WILL EXPIRE
AT 815 PM CDT...

The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

A Tornado Watch remains in effect until 1000 PM CDT for west central
Iowa.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Sioux Falls.

&&

LAT...LON 4256 9598 4256 9575 4251 9574 4244 9603
      4250 9609
TIME...MOT...LOC 0114Z 235DEG 50KT 4265 9571 

$$

BP

Area Forecast Discussion
National Weather Service Sioux Falls SD
Issued by National Weather Service Rapid City SD
653 PM CDT Sun May 17 2026

.KEY MESSAGES...

- There is high confidence that severe thunderstorms will
  develop this afternoon and evening, producing large hail,
  destructive straight-line winds, and a few tornadoes. An
  Enhanced Risk (level 3 of 5) of severe storms is in place.

- A transitioning storm mode will shift hazards from large hail
  and tornadoes initially, to widespread wind damage as an
  intense line of storms tracks east of Interstate 29 this
  evening.

- A lower risk of severe weather exists late Monday afternoon
  and evening, mainly over northwest IA, before quieter weather
  moves in for the mid-week period.

&&

.DISCUSSION...
Issued at 120 PM CDT Sun May 17 2026

The short-term convective outlook presents a highly volatile
spring severe weather setup. Latest surface analysis shows a
complex pattern, anchored by a strong 994 mb low over northwest
KS. An inverted trough extended north of the low through
central SD, while a well-defined warm front stretched northeast
of the low into east central NE. A weaker low was also noted in
north central NE. Visible satellite imagery revealed stable
wave clouds advancing northeast over far northeast NE and
extreme SE SD, ahead of the advancing warm front. Regional
radar imagery showed a complex of strong to severe storms over
north central NE. This storm complex is forecast by short range
guidance to continue tracking east this afternoon, intensifying
as interacts with the richer low- level moisture pool near and
south of the warm front.

Moderate to strong instability will be in place over the
southern to eastern CWA by late afternoon with MLCAPE nearing
3000 J/kg. In addition, deep layer shear will increase to around
50 kt, coincident with a mid level speed max ejecting from the
deep upper trough to our west. As the system evolves over the
next several hours, it appears the ingredients for a significant
severe weather event will be most favored over the southern to
eastern CWA. Ahead of the main convective line, some CAMs show
supercell development along the northward advancing warm front.
These storms would present a risk of very large hail (2"+) and
tornadoes. Given the amount of low level SRH/curved hodographs
present, a couple strong tornadoes are possible. The convective
cluster currently entering our far southwest CWA should
strengthen as it shifts east, with an initial hail and tornado
threat transitioning to a damaging straight line wind threat
(70+ MPH) as it grows upscale into a squall line/QLCS. Some
line-embedded QLCS tornadoes are possible, especially for any
line segments that become oriented north/south or
northwest/southeast, given southwesterly 0-3 km shear vectors.
Timing from latest high-res guidance suggests this activity
exits to the east of our CWA late this evening.

Precipitation amounts will vary significantly based on convective
tracks, though NBM guidance and HREF probability match mean
fields project a widespread 0.50 to 1.50 inches of rainfall,
particularly across northwest Iowa and southwest Minnesota. On
Monday, the cold front finally pushes into the area. Instability
and shear are forecast to be much lower than today, however,
there will be a conditional risk of severe storms over the
eastern CWA during the late afternoon to evening, if the airmass
can destabilize sufficiently ahead of the front. SPC's Day 2
outlook indicates as Marginal Risk (level 1 of 5), for our MN
and IA counties.

Behind the departing upper wave, quasi-zonal flow sets up for
Tuesday and Wednesday, yielding quiet conditions and seasonally
cool high temperatures moderating from the upper 50s Tuesday to
mid-upper 60s Wednesday.

The next upper wave moves in for the Thursday to Friday period,
however Gulf moisture remains cutoff ahead of this system.
Evaluating the ECMWF Extreme Forecast Index (EFI) reveals no
significant climatological anomalies for precipitation or wind
across the upper Midwest during this period, reinforcing the
the idea of a low-impact system for our area. The current
forecast sticks closely to the NBM consensus, maintaining broad
20-30 percent probabilities for light rain for late Thursday
into Saturday.

By late this week and especially this weekend, temperatures
will embark on a steady upward trajectory, as the mid level flow
backs west, then southwest. The Climate Prediction Center (CPC)
6-10 day outlook favors above-normal temperatures across the
Northern Plains and Upper Midwest, which supports blended
guidance high temperatures reaching well into the 80s on
Sunday.

&&

.AVIATION /00Z TAFS THROUGH 00Z TUESDAY/...
Issued at 650 PM CDT Sun May 17 2026

Showers and storms will continue to move eastward into MN through
the evening hours, the forecast area should be largely clear of
shower/storm activity after ~05z. Intermittent MVFR/IFR conditions
in heavy rainfall as well as hail and strong winds will accompany
the strongest storms. Widespread MVFR/IFR cigs will set in overnight
and persist through much of Monday.

&&

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

&&

DISCUSSION...ILX/25
AVIATION...Wong

Hazardous Weather Outlook
National Weather Service Sioux Falls SD
Issued by National Weather Service Lincoln IL
129 PM CDT Sun May 17 2026

IAZ001>003-012>014-020>022-031-032-MNZ071-072-080-081-089-090-097-
098-NEZ013-014-SDZ038>040-050-052>071-181830-
Lyon-Osceola-Dickinson-Sioux-O'Brien-Clay-Plymouth-Cherokee-
Buena Vista-Woodbury-Ida-Lincoln-Murray-Cottonwood-Nobles-Jackson-
Pipestone-Rock-Dixon-Dakota-Beadle-Kingsbury-Brookings-Gregory-
Jerauld-Sanborn-Miner-Lake-Moody-Brule-Aurora-Davison-Hanson-McCook-
Minnehaha-Charles Mix-Douglas-Hutchinson-Turner-Bon Homme-Yankton-
Union-
129 PM CDT Sun May 17 2026

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

.DAY ONE...This afternoon and tonight.

A significant severe weather event is possible this afternoon and
evening. Very large hail, damaging wind gusts, and tornadoes are all
possible. If you have outdoor plans know where your nearest shelter
is located. Please ensure you have multiple ways to receive warnings.
Have a plan to take shelter and act immediately if your area comes
under a severe weather warning.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Strong to severe storms are possible again Monday afternoon and
evening, particularly over northwest Iowa and southwest Minnesota.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will likely be needed this afternoon and evening.

Preliminary Local Storm Report
National Weather Service Sioux Falls SD
641 PM CDT Sun May 17 2026

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

0626 PM     Tstm Wnd Gst     2 NNE Worthington       43.65N 95.59W
05/17/2026  M59 MPH          Nobles             MN   Public

            Via personal weather station. Exact time
            estimated via radar.

&&

ak

Preliminary Local Storm Report
National Weather Service Sioux Falls SD
642 PM CDT Sun May 17 2026

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

0626 PM     Tstm Wnd Gst     2 ENE Worthington       43.63N 95.57W
05/17/2026  M55 MPH          Nobles             MN   AWOS

            AWOS station KOTG Worthington Airport.

&&

ak

Preliminary Local Storm Report
National Weather Service Sioux Falls SD
643 PM CDT Sun May 17 2026

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

0337 PM     Tstm Wnd Dmg     6 E Menno               43.24N 97.45W
05/17/2026                   Hutchinson         SD   Emergency Mngr

            Large garage door on outbuilding bowed in.
            Time estimated from radar.

&&

PR

Preliminary Local Storm Report
National Weather Service Sioux Falls SD
654 PM CDT Sun May 17 2026

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

0601 PM     Hail             Wilmont                 43.76N 95.83W
05/17/2026  M1.25 Inch       Nobles             MN   Public

            mPING: Half Dollar (1.25 in.). Time
            estimated via radar.

&&

ak

Preliminary Local Storm Report
National Weather Service Sioux Falls SD
659 PM CDT Sun May 17 2026

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

0636 PM     Hail             Sibley                  43.41N 95.75W
05/17/2026  E0.75 Inch       Osceola            IA   Public

            Report from mPING: Dime (0.75 in.). Time
            estimated via radar.

&&

ak

Preliminary Local Storm Report
National Weather Service Sioux Falls SD
716 PM CDT Sun May 17 2026

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

0650 PM     Hail             Craig                   42.90N 96.31W
05/17/2026  E1.25 Inch       Plymouth           IA   Public

            Photo via social media. Time estimated by
            radar.

&&

ak