946 
WUUS53 KFSD 180020 RRA
SVRFSD
IAC141-143-180100-
/O.NEW.KFSD.SV.W.0048.260518T0020Z-260518T0100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Sioux Falls SD
720 PM CDT Sun May 17 2026

The National Weather Service in Sioux Falls has issued a

* Severe Thunderstorm Warning for...
  Southeastern Osceola County in northwestern Iowa...
  Northwestern OBrien County in northwestern Iowa...

* Until 800 PM CDT.

* At 720 PM CDT, a severe thunderstorm was located near Ashton, or
  near Sheldon, moving northeast at 25 mph.

  HAZARD...60 mph wind gusts and half dollar size hail.

  SOURCE...Radar indicated.

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

* This severe thunderstorm will be near...
  Sanborn, Ashton, and Melvin around 725 PM CDT.
  Ocheyedan around 740 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

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

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

&&

LAT...LON 4315 9575 4326 9584 4347 9559 4328 9538
TIME...MOT...LOC 0020Z 233DEG 22KT 4324 9576 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.25 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Meyers

458 
WWUS53 KFSD 180034
SVSFSD

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

IAC141-180044-
/O.CAN.KFSD.SV.W.0048.000000T0000Z-260518T0100Z/
OBrien IA-
734 PM CDT Sun May 17 2026

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN OBRIEN COUNTY IS
CANCELLED...

The severe 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 northwestern
Iowa.

&&

LAT...LON 4325 9558 4326 9564 4333 9571 4346 9557
      4331 9541 4330 9541
TIME...MOT...LOC 0034Z 234DEG 28KT 4332 9562 

$$

IAC143-180100-
/O.CON.KFSD.SV.W.0048.000000T0000Z-260518T0100Z/
Osceola IA-
734 PM CDT Sun May 17 2026

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM CDT
FOR EASTERN OSCEOLA COUNTY...

At 734 PM CDT, a severe thunderstorm was located over Melvin, or 8
miles southeast of Sibley, moving northeast 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...
  Ocheyedan around 740 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

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

&&

LAT...LON 4325 9558 4326 9564 4333 9571 4346 9557
      4331 9541 4330 9541
TIME...MOT...LOC 0034Z 234DEG 28KT 4332 9562 

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

$$

Meyers

458 
WWUS53 KFSD 180034
SVSFSD

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

IAC141-180044-
/O.CAN.KFSD.SV.W.0048.000000T0000Z-260518T0100Z/
OBrien IA-
734 PM CDT Sun May 17 2026

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN OBRIEN COUNTY IS
CANCELLED...

The severe 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 northwestern
Iowa.

&&

LAT...LON 4325 9558 4326 9564 4333 9571 4346 9557
      4331 9541 4330 9541
TIME...MOT...LOC 0034Z 234DEG 28KT 4332 9562 

$$

IAC143-180100-
/O.CON.KFSD.SV.W.0048.000000T0000Z-260518T0100Z/
Osceola IA-
734 PM CDT Sun May 17 2026

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM CDT
FOR EASTERN OSCEOLA COUNTY...

At 734 PM CDT, a severe thunderstorm was located over Melvin, or 8
miles southeast of Sibley, moving northeast 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...
  Ocheyedan around 740 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

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

&&

LAT...LON 4325 9558 4326 9564 4333 9571 4346 9557
      4331 9541 4330 9541
TIME...MOT...LOC 0034Z 234DEG 28KT 4332 9562 

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

$$

Meyers

953 
WWUS53 KFSD 180046
SVSFSD

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

IAC143-180056-
/O.CAN.KFSD.SV.W.0048.000000T0000Z-260518T0100Z/
Osceola IA-
746 PM CDT Sun May 17 2026

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN OSCEOLA COUNTY IS
CANCELLED...

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 has been cancelled.  However, small hail and
gusty winds are still possible with this thunderstorm.

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

&&

LAT...LON 4325 9558 4326 9564 4333 9571 4346 9557
      4331 9541 4330 9541
TIME...MOT...LOC 0046Z 233DEG 22KT 4337 9554 

$$

Meyers