Severe Thunderstorm Warning 87, NWS Sioux Falls, SD

441 
WWUS53 KFSD 010503
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
1203 AM CDT Mon Jun 1 2026

IAC035-149-010512-
/O.CAN.KFSD.SV.W.0087.000000T0000Z-260601T0530Z/
Cherokee IA-Plymouth IA-
1203 AM CDT Mon Jun 1 2026

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN CHEROKEE AND
SOUTHEASTERN PLYMOUTH COUNTIES IS CANCELLED...

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

A Severe Thunderstorm Watch remains in effect until 200 AM CDT for
west central Iowa.

&&

LAT...LON 4239 9614 4243 9628 4256 9626 4256 9582
      4235 9590
TIME...MOT...LOC 0502Z 283DEG 25KT 4250 9614 

$$

IAC193-010530-
/O.CON.KFSD.SV.W.0087.000000T0000Z-260601T0530Z/
Woodbury IA-
1203 AM CDT Mon Jun 1 2026

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1230 AM CDT
FOR NORTHEASTERN WOODBURY COUNTY...

At 1202 AM CDT, a severe thunderstorm was located over Lawton, or 13
miles east of Sioux City, moving east at 30 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

This severe storm will be near...
  Moville around 1210 AM CDT.
  Pierson around 1215 AM CDT.

Other locations impacted by this severe thunderstorm include Bronson.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4239 9614 4243 9628 4256 9626 4256 9582
      4235 9590
TIME...MOT...LOC 0502Z 283DEG 25KT 4250 9614 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

SG

203 
WWUS53 KFSD 010517
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
1217 AM CDT Mon Jun 1 2026

IAC193-010530-
/O.CON.KFSD.SV.W.0087.000000T0000Z-260601T0530Z/
Woodbury IA-
1217 AM CDT Mon Jun 1 2026

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1230 AM CDT
FOR NORTHEASTERN WOODBURY COUNTY...

At 1216 AM CDT, a severe thunderstorm was located near Moville, or 16
miles east of Sioux City, moving east at 25 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4239 9614 4242 9621 4255 9619 4253 9583
      4235 9590
TIME...MOT...LOC 0516Z 289DEG 22KT 4244 9608 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

SG

784 
WWUS53 KFSD 010526
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
1226 AM CDT Mon Jun 1 2026

IAC193-010535-
/O.EXP.KFSD.SV.W.0087.000000T0000Z-260601T0530Z/
Woodbury IA-
1226 AM CDT Mon Jun 1 2026

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN WOODBURY COUNTY
WILL EXPIRE AT 1230 AM 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, heavy
rain is still possible with this thunderstorm.

A Severe Thunderstorm Watch remains in effect until 200 AM CDT for
west central Iowa.

Remember, a Severe Thunderstorm Warning still remains in effect for
central and southern Woodbury county until 115 AM CDT.

&&

LAT...LON 4239 9614 4242 9621 4255 9619 4253 9583
      4235 9590
TIME...MOT...LOC 0525Z 288DEG 24KT 4243 9602 

$$

SG

Area Forecast Discussion
National Weather Service Sioux Falls SD
Issued by National Weather Service Rapid City SD
655 PM CDT Sun May 31 2026

.KEY MESSAGES...

- Isolated to scattered thunderstorms should develop late this
  afternoon into early evening. Large hail up to half dollar and
  damaging winds to 60 mph would be the main hazards. A Level 1
  of 5 risk for severe storms covers most of the area for this
  threat.

- Similar to today, a conditional Level 1 of 5 risk for severe
  storms covers the forecast area Monday afternoon. The chance
  of development looks lower than today, but if a storm can
  form, large hail and isolated damaging winds could occur.

- High chances (50-80%) for rain will persist through the bulk
  of next week. However, severe storm chances continue to look
  low (near 5% or less) through next week. The better chances
  for rainfall appear to be Wednesday in central SD and
  Wednesday night into Thursday area wide.

&&

.DISCUSSION...
Issued at 1235 PM CDT Sun May 31 2026

An active pattern is expected over the next several days, although
severe weather appears to remain a minor threat. Patchy heavy rain
may play the bigger role with each event.

For this afternoon and tonight, a small corridor of low level
convergence and lift will focus near and just east of the James
Valley. Clouds have cleared through early afternoon and temperatures
have risen a touch. Along with this temperature rise is a turn in
the surface winds to a more south to southwest direction vs.
southeast. This is what is aiding in this low level convergence. The
latest model soundings indicate something around 1500-2000 J/kg CAPE
but weak, disorganized shear. This suggests severe weather should
remain limited, but maybe a cell merger or two could produce a
couple of updrafts strong enough to support hail to half dollar
and wind gusts to 60 mph. Stronger storms will likely drift
east or northeast at about 15 mph, so fairly slow moving. With
this slower storm motion in mind, will need to keep an eye on
the locally heavy rain potential. A handful of the latest hi-res
models are showing small areas of 1-3" of rain with this
development. One area to keep a closer eye on will be parts of
Western Lake county, Northeast McCook and western Minnehaha
where 1-3" of rain fell late last night.

The question becomes what will drive development; will it be diurnal
heating, which would allow updrafts to start developing around 19-
21z, or will it be the weak wave which moves into the area closer to
0-3z this evening. The latest HRRR and Nam output agree with the
later start times, with the Nam indicating a stronger cap and less
development, while the RRFS and RAP kick off development a little
sooner with weaker capping. With the clearing that we are seeing in
central SD towards the James Valley we may see some development by
mid to late afternoon as destabilization is more likely. Suspect
some development between about 5-6pm.

One last thing to watch out for, if we can get mid to late afternoon
development, the LFC are marginally low and a weak convergent
boundary should be in parts of south central and southeast SD, so an
isolated funnel or two will be possible.

While a marginal risk for severe weather is in place for Monday,
confidence in the chances of development are very low. A capping
inversion may win out and for now CAPE values only running around
1000 J/kg with continued weak shear, albeit a little bit better than
today.

Another wave moves through Tuesday but weak shear and weak
instability suggest if anything can develop severe weather is very
unlikely.

Wednesday into Thursday looks like the better chance for more clouds
and better rainfall chances. Broad southerly warm advection looks to
bring in some weak elevated instability as low pressure tracks east
through ND. For now not anticipating all day rainfall but should see
off and on chances Wednesday and Thursday as this low tracks by to
the north.

Friday into Sunday will see periodic weaker waves move through the
area with a continuation of relatively weak flow aloft. This
continued weaker shear environment should keep severe weather
threats very limited.

&&

.AVIATION...(For the 00Z TAFS Through 00Z Monday Evening)
Issued At 651 PM CDT Sun May 31 2026

Isolated showers and thunderstorms will continue to be possible
across the area through the early evening hours. Low stratus is
expected to develop tonight over southwest Minnesota and eastern
South Dakota, especially near and east of I-29. Highest confidence
location for this MVFR to IFR stratus regarding the TAF sites will
be at KFSD. Winds will turn light through the overnight hours, and
this could also result in fog, though confidence is a bit lower in
development. Additional showers and storms may develop Monday
afternoon, but low confidence in development and location of these
storms preclude mention in the TAFs at this time.

&&

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

&&

DISCUSSION...08
AVIATION...13

Hazardous Weather Outlook
National Weather Service Sioux Falls SD
133 PM CDT Sun May 31 2026

IAZ001>003-012>014-020>022-031-032-MNZ071-072-080-081-089-090-097-
098-NEZ013-014-SDZ038>040-050-052>071-011845-
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-
133 PM CDT Sun May 31 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 Level 1 of 5 risk for severe storms is in place for late this
afternoon and evening. Isolated to scattered thunderstorms should
develop late this afternoon between the James River and I-29, then
progress eastward through the evening. A very isolated stronger
storm could produce hail to half dollar and wind gusts to 60 mph.
Locally heavier rain will also be possible with small swaths of one
to three inches of rainfall.

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

There is a low chance for storms again Monday afternoon. Similar to
today, confidence in storm development is low. However, if storms
can develop, isolated damaging winds and large hail would be the
main threats.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

Preliminary Local Storm Report
National Weather Service Sioux Falls SD
805 PM CDT Sun May 31 2026

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

0754 PM     Hail             2 WNW Davis             43.27N 97.04W
05/31/2026  E1.00 Inch       Turner             SD   Public

&&

TRM

Preliminary Local Storm Report
National Weather Service Sioux Falls SD
818 PM CDT Sun May 31 2026

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

0817 PM     Hail             Wakonda                 43.01N 97.11W
05/31/2026  E0.88 Inch       Clay               SD   Trained Spotter

&&

TRM

Preliminary Local Storm Report
National Weather Service Sioux Falls SD
823 PM CDT Sun May 31 2026

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

0811 PM     Tornado          4 W Wall Lake           43.53N 97.03W
05/31/2026                   Minnehaha          SD   NWS Employee

            Radar confirmed tonado.

&&

TRM

Preliminary Local Storm Report
National Weather Service Sioux Falls SD
847 PM CDT Sun May 31 2026

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

0845 PM     Hail             Davis                   43.26N 97.00W
05/31/2026  E1.00 Inch       Turner             SD   Emergency Mngr

&&

TRM

Preliminary Local Storm Report
National Weather Service Sioux Falls SD
858 PM CDT Sun May 31 2026

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

0854 PM     Tornado          5 NE Centerville        43.17N 96.89W
05/31/2026                   Lincoln            SD   Storm Chaser

            Tornado observed from chaser live feed.

&&

TRM

Preliminary Local Storm Report
National Weather Service Sioux Falls SD
1142 PM CDT Sun May 31 2026

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

1137 PM     Hail             3 N Sioux City          42.54N 96.40W
05/31/2026  E0.70 Inch       Woodbury           IA   Public

            Caller reported ongoing pea to dime sized
            hail. Location estimated by radar.

&&

AS