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Home Return to list Severe Thunderstorm Warning 0154 Issued by the Omaha / Valley Forecast Office
Action: New Issued At: 2026-05-17 20:57:09
873
WUUS53 KOAX 180156
SVROAX
IAC085-133-155-165-180300-
/O.NEW.KOAX.SV.W.0154.260518T0156Z-260518T0300Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Omaha/Valley Nebraska
856 PM CDT Sun May 17 2026
The National Weather Service in Omaha has issued a
* Severe Thunderstorm Warning for...
Southeastern Monona County in west central Iowa...
Pottawattamie County in southwestern Iowa...
Eastern Harrison County in southwestern Iowa...
Shelby County in southwestern Iowa...
* Until 1000 PM CDT.
* At 856 PM CDT, severe thunderstorms were located along a line
extending from near Panama to 4 miles west of Hancock to 4 miles
southeast of Treynor, moving east at 45 mph.
HAZARD...70 mph wind gusts and penny size hail.
SOURCE...Radar indicated. This storm has a history of 60 to 70 mph
winds.
IMPACT...Expect considerable tree damage. Damage is likely to
mobile homes, roofs, and outbuildings.
* Locations impacted include...
Eastern Council Bluffs, Harlan, Logan, Oakland, Avoca, Woodbine,
Dunlap, Treynor, Underwood, Neola, Carson, Walnut, Shelby, Minden,
Earling, Irwin, Persia, Defiance, Macedonia, and Panama.
This includes the following highways...
Interstate 29 between mile markers 43 and 47.
Interstate 80 in Iowa between mile markers 5 and 48.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 1000 PM CDT for west central
Iowa. A Tornado Watch also remains in effect until 1100 PM CDT for
southwestern Iowa.
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4150 9516 4116 9516 4116 9584 4159 9581
4192 9594 4191 9567 4187 9567 4186 9566
4186 9510 4160 9509 4160 9504 4151 9504
TIME...MOT...LOC 0156Z 252DEG 40KT 4174 9546 4140 9546 4118 9555
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...OBSERVED
MAX WIND GUST...70 MPH
$$
Petersen
Action: Continued Issued At: 2026-05-17 21:17:54
625
WWUS53 KOAX 180217
SVSOAX
Severe Weather Statement
National Weather Service Omaha/Valley Nebraska
917 PM CDT Sun May 17 2026
IAC133-180226-
/O.CAN.KOAX.SV.W.0154.000000T0000Z-260518T0300Z/
Monona IA-
917 PM CDT Sun May 17 2026
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MONONA COUNTY IS
CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
A Tornado Watch remains in effect until 1100 PM CDT for southwestern
Iowa.
&&
LAT...LON 4150 9516 4116 9516 4116 9584 4152 9573
4166 9562 4186 9558 4186 9510 4160 9509
4160 9504 4151 9504
TIME...MOT...LOC 0216Z 252DEG 40KT 4180 9520 4146 9520 4124 9529
$$
IAC085-155-165-180300-
/O.CON.KOAX.SV.W.0154.000000T0000Z-260518T0300Z/
Pottawattamie IA-Harrison IA-Shelby IA-
917 PM CDT Sun May 17 2026
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1000 PM CDT
FOR POTTAWATTAMIE...EASTERN HARRISON AND SHELBY COUNTIES...
At 916 PM CDT, severe thunderstorms were located along a line
extending from near Irwin to 2 miles southeast of Walnut to 6 miles
east of Carson, moving east at 45 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Eastern Council Bluffs, Harlan, Oakland, Avoca, Treynor, Underwood,
Neola, Carson, Walnut, Shelby, Minden, Earling, Irwin, Persia,
Defiance, Macedonia, Panama, Hancock, Council Bluffs Airport, and
Portsmouth.
This includes the following highways...
Interstate 29 near mile marker 43.
Interstate 80 in Iowa between mile markers 8 and 48.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 1100 PM CDT for southwestern
Iowa.
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4150 9516 4116 9516 4116 9584 4152 9573
4166 9562 4186 9558 4186 9510 4160 9509
4160 9504 4151 9504
TIME...MOT...LOC 0216Z 252DEG 40KT 4180 9520 4146 9520 4124 9529
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...OBSERVED
MAX WIND GUST...60 MPH
$$
Petersen
Action: Cancelled Issued At: 2026-05-17 21:17:54
625
WWUS53 KOAX 180217
SVSOAX
Severe Weather Statement
National Weather Service Omaha/Valley Nebraska
917 PM CDT Sun May 17 2026
IAC133-180226-
/O.CAN.KOAX.SV.W.0154.000000T0000Z-260518T0300Z/
Monona IA-
917 PM CDT Sun May 17 2026
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MONONA COUNTY IS
CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
A Tornado Watch remains in effect until 1100 PM CDT for southwestern
Iowa.
&&
LAT...LON 4150 9516 4116 9516 4116 9584 4152 9573
4166 9562 4186 9558 4186 9510 4160 9509
4160 9504 4151 9504
TIME...MOT...LOC 0216Z 252DEG 40KT 4180 9520 4146 9520 4124 9529
$$
IAC085-155-165-180300-
/O.CON.KOAX.SV.W.0154.000000T0000Z-260518T0300Z/
Pottawattamie IA-Harrison IA-Shelby IA-
917 PM CDT Sun May 17 2026
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1000 PM CDT
FOR POTTAWATTAMIE...EASTERN HARRISON AND SHELBY COUNTIES...
At 916 PM CDT, severe thunderstorms were located along a line
extending from near Irwin to 2 miles southeast of Walnut to 6 miles
east of Carson, moving east at 45 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Eastern Council Bluffs, Harlan, Oakland, Avoca, Treynor, Underwood,
Neola, Carson, Walnut, Shelby, Minden, Earling, Irwin, Persia,
Defiance, Macedonia, Panama, Hancock, Council Bluffs Airport, and
Portsmouth.
This includes the following highways...
Interstate 29 near mile marker 43.
Interstate 80 in Iowa between mile markers 8 and 48.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 1100 PM CDT for southwestern
Iowa.
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4150 9516 4116 9516 4116 9584 4152 9573
4166 9562 4186 9558 4186 9510 4160 9509
4160 9504 4151 9504
TIME...MOT...LOC 0216Z 252DEG 40KT 4180 9520 4146 9520 4124 9529
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...OBSERVED
MAX WIND GUST...60 MPH
$$
Petersen
Action: Continued Issued At: 2026-05-17 21:24:40
691
WWUS53 KOAX 180224
SVSOAX
Severe Weather Statement
National Weather Service Omaha/Valley Nebraska
924 PM CDT Sun May 17 2026
IAC085-155-165-180300-
/O.CON.KOAX.SV.W.0154.000000T0000Z-260518T0300Z/
Pottawattamie IA-Harrison IA-Shelby IA-
924 PM CDT Sun May 17 2026
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1000 PM CDT
FOR EASTERN POTTAWATTAMIE...SOUTHEASTERN HARRISON AND SHELBY
COUNTIES...
At 923 PM CDT, severe thunderstorms were located along a line
extending from 4 miles northeast of Irwin to 5 miles east of Walnut
to 4 miles northwest of Griswold, moving east at 45 mph.
HAZARD...60 mph wind gusts.
SOURCE...At 916 PM, a public mesonet station reported 60 mph in
Oakland, Iowa.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Harlan, Oakland, Avoca, Treynor, Carson, Walnut, Shelby, Minden,
Earling, Irwin, Defiance, Macedonia, Panama, Hancock, Portsmouth,
Westphalia, Tennant, Kirkman, Old Town Park, and Prairie Rose State
Park.
This includes Interstate 80 in Iowa between mile markers 29 and 48.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 1100 PM CDT for southwestern
Iowa.
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4150 9516 4116 9516 4116 9565 4186 9546
4186 9510 4160 9509 4160 9504 4151 9504
TIME...MOT...LOC 0223Z 252DEG 40KT 4182 9512 4148 9512 4126 9521
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...OBSERVED
MAX WIND GUST...60 MPH
$$
Petersen
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