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Home Return to list Severe Thunderstorm Warning 0323 Issued by the Des Moines Forecast Office
Action: New Issued At: 2026-08-13 07:11:53
920
WUUS53 KDMX 131211
SVRDMX
IAC099-127-157-169-171-131300-
/O.NEW.KDMX.SV.W.0323.260813T1211Z-260813T1300Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Des Moines IA
711 AM CDT Thu Aug 13 2026
The National Weather Service in Des Moines has issued a
* Severe Thunderstorm Warning for...
Western Poweshiek County in central Iowa...
Southeastern Story County in central Iowa...
Marshall County in central Iowa...
Southwestern Tama County in central Iowa...
Jasper County in central Iowa...
* Until 800 AM CDT.
* At 711 AM CDT, severe thunderstorms were located along a line
extending from Colo to Baxter to near Runnells, moving east at 40
mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Locations impacted include...
Marshalltown, Newton, Grinnell, Tama, Colfax, Monroe, Prairie City,
State Center, Baxter, Iowa Speedway, Meskwaki Casino, Rock Creek
Lake, Le Grand, Colo, Melbourne, Sully, Kellogg, Gilman, Lynnville,
and Rhodes.
This includes Interstate 80 between mile markers 153 and 190.
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.
&&
LAT...LON 4208 9274 4186 9246 4151 9270 4152 9333
4184 9326 4207 9336
TIME...MOT...LOC 1211Z 269DEG 36KT 4204 9330 4184 9314 4153 9330
TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Hahn
Action: Continued Issued At: 2026-08-13 07:31:39
423
WWUS53 KDMX 131231
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
731 AM CDT Thu Aug 13 2026
IAC169-131240-
/O.CAN.KDMX.SV.W.0323.000000T0000Z-260813T1300Z/
Story IA-
731 AM CDT Thu Aug 13 2026
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN STORY COUNTY IS
CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 1100 AM CDT for
central Iowa.
LAT...LON 4208 9274 4186 9246 4151 9270 4152 9323
4184 9309 4206 9322
TIME...MOT...LOC 1230Z 269DEG 36KT 4204 9306 4184 9290 4153 9306
$$
IAC099-127-157-171-131300-
/O.CON.KDMX.SV.W.0323.000000T0000Z-260813T1300Z/
Poweshiek IA-Marshall IA-Tama IA-Jasper IA-
731 AM CDT Thu Aug 13 2026
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 AM CDT
FOR WESTERN POWESHIEK...SOUTHERN MARSHALL...SOUTHWESTERN TAMA AND
JASPER COUNTIES...
At 730 AM CDT, severe thunderstorms were located along a line
extending from 5 miles east of State Center to near Laurel to near
Monroe, moving east at 40 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Marshalltown, Newton, Grinnell, Tama, Monroe, State Center, Iowa
Speedway, Meskwaki Casino, Rock Creek Lake, Le Grand, Melbourne,
Sully, Kellogg, Gilman, Lynnville, Malcom, Montour, Laurel,
Haverhill, and Lambs Grove.
This includes Interstate 80 between mile markers 160 and 190.
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.
&&
LAT...LON 4208 9274 4186 9246 4151 9270 4152 9323
4184 9309 4206 9322
TIME...MOT...LOC 1230Z 269DEG 36KT 4204 9306 4184 9290 4153 9306
TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Hahn
Action: Cancelled Issued At: 2026-08-13 07:31:39
423
WWUS53 KDMX 131231
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
731 AM CDT Thu Aug 13 2026
IAC169-131240-
/O.CAN.KDMX.SV.W.0323.000000T0000Z-260813T1300Z/
Story IA-
731 AM CDT Thu Aug 13 2026
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN STORY COUNTY IS
CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 1100 AM CDT for
central Iowa.
LAT...LON 4208 9274 4186 9246 4151 9270 4152 9323
4184 9309 4206 9322
TIME...MOT...LOC 1230Z 269DEG 36KT 4204 9306 4184 9290 4153 9306
$$
IAC099-127-157-171-131300-
/O.CON.KDMX.SV.W.0323.000000T0000Z-260813T1300Z/
Poweshiek IA-Marshall IA-Tama IA-Jasper IA-
731 AM CDT Thu Aug 13 2026
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 AM CDT
FOR WESTERN POWESHIEK...SOUTHERN MARSHALL...SOUTHWESTERN TAMA AND
JASPER COUNTIES...
At 730 AM CDT, severe thunderstorms were located along a line
extending from 5 miles east of State Center to near Laurel to near
Monroe, moving east at 40 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Marshalltown, Newton, Grinnell, Tama, Monroe, State Center, Iowa
Speedway, Meskwaki Casino, Rock Creek Lake, Le Grand, Melbourne,
Sully, Kellogg, Gilman, Lynnville, Malcom, Montour, Laurel,
Haverhill, and Lambs Grove.
This includes Interstate 80 between mile markers 160 and 190.
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.
&&
LAT...LON 4208 9274 4186 9246 4151 9270 4152 9323
4184 9309 4206 9322
TIME...MOT...LOC 1230Z 269DEG 36KT 4204 9306 4184 9290 4153 9306
TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Hahn
Action: Expired Issued At: 2026-08-13 07:58:40
043
WWUS53 KDMX 131258
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
758 AM CDT Thu Aug 13 2026
IAC099-127-157-171-131308-
/O.EXP.KDMX.SV.W.0323.000000T0000Z-260813T1300Z/
Poweshiek IA-Marshall IA-Tama IA-Jasper IA-
758 AM CDT Thu Aug 13 2026
...THE SEVERE THUNDERSTORM WARNING FOR WESTERN POWESHIEK...SOUTHERN
MARSHALL...SOUTHWESTERN TAMA AND JASPER COUNTIES WILL EXPIRE AT 800
AM CDT...
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning will be allowed to expire.
A Severe Thunderstorm Watch remains in effect until 1100 AM CDT for
central Iowa.
LAT...LON 4208 9274 4186 9246 4151 9270 4152 9323
4184 9309 4206 9322
TIME...MOT...LOC 1258Z 269DEG 36KT 4204 9270 4184 9254 4153 9270
$$
Hahn
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