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Severe Thunderstorm Warning 0171
Issued by the Des Moines Forecast Office

Action Issued Starts Expiration
New 2026-05-17 21:28:40 2026-05-17 21:28:00 2026-05-17 22:30:00
Continued 2026-05-17 22:02:11 2026-05-17 22:30:00
Cancelled 2026-05-17 22:02:11 2026-05-17 22:30:00
Expired 2026-05-17 22:29:42 2026-05-17 22:30:00


Action: New
Issued At: 2026-05-17 21:28:40

895 
WUUS53 KDMX 180228
SVRDMX
IAC033-063-069-081-091-109-147-189-195-197-180330-
/O.NEW.KDMX.SV.W.0171.260518T0228Z-260518T0330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Des Moines IA
928 PM CDT Sun May 17 2026

The National Weather Service in Des Moines has issued a

* Severe Thunderstorm Warning for...
  Eastern Emmet County in northwestern Iowa...
  Western Worth County in north central Iowa...
  Northern Wright County in north central Iowa...
  Northwestern Franklin County in north central Iowa...
  Kossuth County in north central Iowa...
  Northern Humboldt County in north central Iowa...
  Hancock County in north central Iowa...
  Western Cerro Gordo County in north central Iowa...
  Winnebago County in north central Iowa...
  Northeastern Palo Alto County in northwestern Iowa...

* Until 1030 PM CDT.

* At 927 PM CDT, severe thunderstorms were located along a line
  extending from 4 miles southwest of Ceylon to near Irvington to
  near Callender, moving east at 60 mph.

  HAZARD...70 mph wind gusts and nickel size hail.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Algona, Forest City, Garner, Belmond, Lake Mills, Britt, Emmons,
  Swan Lake, Iowa Lake, Elm Lake, Union Slogh, Clear Lake, Eagle
  Lake, Mason City Municipal Airport, Rice Lake, Okamanpedan Lake,
  Armstrong, Buffalo Center, Bancroft, and Ventura.

This includes Interstate 35 between mile markers 167 and 218.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

This is a DANGEROUS SITUATION. These storms are producing widespread 
wind damage. SEEK SHELTER NOW inside a sturdy structure and stay 
away from windows! Intense thunderstorm lines can produce brief 
tornadoes and widespread significant wind damage. Although a tornado 
is not immediately likely, it is best to move to an interior room on 
the lowest floor of a building. These storms may cause serious 
injury and significant property damage.

A Tornado Watch remains in effect until 100 AM CDT for north central
and northwestern Iowa.

&&

LAT...LON 4350 9333 4275 9331 4276 9434 4303 9436
      4350 9484
TIME...MOT...LOC 0227Z 264DEG 51KT 4349 9469 4297 9424 4233 9436 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.88 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

Donavon


Action: Continued
Issued At: 2026-05-17 22:02:11

756 
WWUS53 KDMX 180301 RRA
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
1001 PM CDT Sun May 17 2026

IAC063-147-180310-
/O.CAN.KDMX.SV.W.0171.000000T0000Z-260518T0330Z/
Emmet IA-Palo Alto IA-
1001 PM CDT Sun May 17 2026

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN EMMET AND NORTHEASTERN
PALO ALTO COUNTIES IS CANCELLED...

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

A Tornado Watch remains in effect until 100 AM CDT for north central
Iowa.

LAT...LON 4350 9333 4275 9331 4276 9410 4320 9409
      4350 9443
TIME...MOT...LOC 0300Z 248DEG 56KT 4364 9396 4317 9363 4246 9378 

$$

IAC033-069-081-091-109-189-195-197-180330-
/O.CON.KDMX.SV.W.0171.000000T0000Z-260518T0330Z/
Worth IA-Wright IA-Franklin IA-Kossuth IA-Humboldt IA-Hancock IA-
Cerro Gordo IA-Winnebago IA-
1001 PM CDT Sun May 17 2026

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1030 PM CDT
FOR WESTERN WORTH...NORTHERN WRIGHT...NORTHWESTERN FRANKLIN...EASTERN
KOSSUTH...NORTHEASTERN HUMBOLDT...HANCOCK...WESTERN CERRO GORDO AND
WINNEBAGO COUNTIES...

At 1000 PM CDT, severe thunderstorms were located along a line
extending from 4 miles northwest of Frost to Miller to Webster City,
moving east at 65 mph.

HAZARD...70 mph wind gusts and nickel size hail.

SOURCE...Radar indicated.

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

Locations impacted include...
Forest City, Garner, Belmond, Lake Mills, Britt, Emmons, Elm Lake,
Union Slogh, Clear Lake, Eagle Lake, Mason City Municipal Airport,
Rice Lake, Buffalo Center, Ventura, Kanawha, Swea City, Latimer,
Klemme, Thompson, and Titonka.

This includes Interstate 35 between mile markers 167 and 218.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 100 AM CDT for north central
Iowa.

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

Intense thunderstorm lines can produce brief tornadoes and widespread
significant wind damage. Although a tornado is not immediately
likely, it is best to move to an interior room on the lowest floor of
a building. These storms may cause serious injury and significant
property damage.

&&

LAT...LON 4350 9333 4275 9331 4276 9410 4320 9409
      4350 9443
TIME...MOT...LOC 0300Z 248DEG 56KT 4364 9396 4317 9363 4246 9378 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.88 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

Donavon


Action: Cancelled
Issued At: 2026-05-17 22:02:11

756 
WWUS53 KDMX 180301 RRA
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
1001 PM CDT Sun May 17 2026

IAC063-147-180310-
/O.CAN.KDMX.SV.W.0171.000000T0000Z-260518T0330Z/
Emmet IA-Palo Alto IA-
1001 PM CDT Sun May 17 2026

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN EMMET AND NORTHEASTERN
PALO ALTO COUNTIES IS CANCELLED...

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

A Tornado Watch remains in effect until 100 AM CDT for north central
Iowa.

LAT...LON 4350 9333 4275 9331 4276 9410 4320 9409
      4350 9443
TIME...MOT...LOC 0300Z 248DEG 56KT 4364 9396 4317 9363 4246 9378 

$$

IAC033-069-081-091-109-189-195-197-180330-
/O.CON.KDMX.SV.W.0171.000000T0000Z-260518T0330Z/
Worth IA-Wright IA-Franklin IA-Kossuth IA-Humboldt IA-Hancock IA-
Cerro Gordo IA-Winnebago IA-
1001 PM CDT Sun May 17 2026

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1030 PM CDT
FOR WESTERN WORTH...NORTHERN WRIGHT...NORTHWESTERN FRANKLIN...EASTERN
KOSSUTH...NORTHEASTERN HUMBOLDT...HANCOCK...WESTERN CERRO GORDO AND
WINNEBAGO COUNTIES...

At 1000 PM CDT, severe thunderstorms were located along a line
extending from 4 miles northwest of Frost to Miller to Webster City,
moving east at 65 mph.

HAZARD...70 mph wind gusts and nickel size hail.

SOURCE...Radar indicated.

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

Locations impacted include...
Forest City, Garner, Belmond, Lake Mills, Britt, Emmons, Elm Lake,
Union Slogh, Clear Lake, Eagle Lake, Mason City Municipal Airport,
Rice Lake, Buffalo Center, Ventura, Kanawha, Swea City, Latimer,
Klemme, Thompson, and Titonka.

This includes Interstate 35 between mile markers 167 and 218.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 100 AM CDT for north central
Iowa.

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

Intense thunderstorm lines can produce brief tornadoes and widespread
significant wind damage. Although a tornado is not immediately
likely, it is best to move to an interior room on the lowest floor of
a building. These storms may cause serious injury and significant
property damage.

&&

LAT...LON 4350 9333 4275 9331 4276 9410 4320 9409
      4350 9443
TIME...MOT...LOC 0300Z 248DEG 56KT 4364 9396 4317 9363 4246 9378 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.88 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

Donavon


Action: Expired
Issued At: 2026-05-17 22:29:42

507 
WWUS53 KDMX 180329
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
1029 PM CDT Sun May 17 2026

IAC033-069-081-091-109-189-195-197-180339-
/O.EXP.KDMX.SV.W.0171.000000T0000Z-260518T0330Z/
Worth IA-Wright IA-Franklin IA-Kossuth IA-Humboldt IA-Hancock IA-
Cerro Gordo IA-Winnebago IA-
1029 PM CDT Sun May 17 2026

...THE SEVERE THUNDERSTORM WARNING FOR WESTERN WORTH...NORTHERN
WRIGHT...NORTHWESTERN FRANKLIN...EASTERN KOSSUTH...NORTHEASTERN
HUMBOLDT...HANCOCK...WESTERN CERRO GORDO AND WINNEBAGO COUNTIES WILL
EXPIRE AT 1030 PM CDT...

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

A Tornado Watch remains in effect until 100 AM CDT for north central
Iowa.

LAT...LON 4350 9333 4275 9331 4276 9410 4320 9409
      4350 9443
TIME...MOT...LOC 0329Z 264DEG 51KT 4368 9343 4321 9310 4250 9325 

$$

Donavon



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