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Home Return to list Severe Thunderstorm Warning 0256 Issued by the Davenport / Quad Cities Forecast Office
Action: New Issued At: 2026-08-12 04:37:35 280 WUUS53 KDVN 120937 SVRDVN IAC011-095-103-113-121030- /O.NEW.KDVN.SV.W.0256.260812T0937Z-260812T1030Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Quad Cities IA/IL 437 AM CDT Wed Aug 12 2026 The National Weather Service in the Quad Cities has issued a * Severe Thunderstorm Warning for... Northwestern Johnson County in east central Iowa... Southern Benton County in east central Iowa... Southwestern Linn County in east central Iowa... Northern Iowa County in east central Iowa... * Until 530 AM CDT. * At 436 AM CDT, a severe thunderstorm was located over Belle Plaine, or 13 miles northwest of Marengo, moving east at 40 mph. HAZARD...Quarter size hail. SOURCE...Radar indicated. IMPACT...Damage to vehicles is expected. * This severe thunderstorm will be near... Belle Plaine, Blairstown, Luzerne, Koszta, and Hannen Lake Park around 440 AM CDT. Marengo around 445 AM CDT. Norway, Iowa County Fairgrounds, and Watkins around 450 AM CDT. West Amana and High Amana around 455 AM CDT. Other locations in the path of this severe thunderstorm include Walford, Amana, East Amana, Middle Amana, South Amana, Cedar Rapids, Fairfax, Swisher, Cedar Rapids Municipal Airport, Shueyville and Cou Falls. This includes Interstate 380 between mile markers 2 and 19. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a sturdy building. && LAT...LON 4200 9230 4196 9155 4170 9159 4181 9230 TIME...MOT...LOC 0936Z 275DEG 34KT 4191 9227 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...1.00 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...<50 MPH $$ Gross Action: Continued Issued At: 2026-08-12 04:44:05
543
WWUS53 KDVN 120943
SVSDVN
Severe Weather Statement
National Weather Service Quad Cities IA/IL
443 AM CDT Wed Aug 12 2026
IAC011-095-103-113-121030-
/O.CON.KDVN.SV.W.0256.000000T0000Z-260812T1030Z/
Johnson IA-Benton IA-Linn IA-Iowa IA-
443 AM CDT Wed Aug 12 2026
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 AM CDT
FOR NORTHWESTERN JOHNSON...SOUTHERN BENTON...SOUTHWESTERN LINN AND
NORTHERN IOWA COUNTIES...
At 442 AM CDT, a severe thunderstorm was located over Luzerne, or 9
miles northwest of Marengo, moving east at 40 mph.
HAZARD...Quarter size hail.
SOURCE...Radar indicated. At 4:41 am, nickel to quarter size hail
was reported in Belle Plaine.
IMPACT...Damage to vehicles is expected.
This severe storm will be near...
Marengo, Blairstown, Luzerne, Iowa County Fairgrounds, Watkins,
and Hannen Lake Park around 445 AM CDT.
Norway around 450 AM CDT.
West Amana, High Amana, and South Amana around 455 AM CDT.
Other locations in the path of this severe thunderstorm include
Fairfax, Walford, Amana, East Amana, Middle Amana, Cedar Rapids,
Swisher, Shueyville, Cedar Rapids Municipal Airport, Homestead, Ely,
Cou Falls, North Liberty and Sandy Beach Camp Ground.
This includes Interstate 380 between mile markers 2 and 19.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
sturdy building.
&&
LAT...LON 4200 9230 4196 9155 4170 9159 4181 9230
TIME...MOT...LOC 0942Z 275DEG 34KT 4190 9219
HAIL THREAT...OBSERVED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH
$$
Gross
Action: Continued Issued At: 2026-08-12 05:02:06 009 WWUS53 KDVN 121001 SVSDVN Severe Weather Statement National Weather Service Quad Cities IA/IL 501 AM CDT Wed Aug 12 2026 IAC011-095-103-113-121030- /O.CON.KDVN.SV.W.0256.000000T0000Z-260812T1030Z/ Johnson IA-Benton IA-Linn IA-Iowa IA- 501 AM CDT Wed Aug 12 2026 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 AM CDT FOR NORTHWESTERN JOHNSON...SOUTHEASTERN BENTON...SOUTHWESTERN LINN AND NORTHEASTERN IOWA COUNTIES... At 501 AM CDT, a severe thunderstorm was located near Iowa County Fairgrounds, or near Marengo, moving east at 30 mph. HAZARD...Quarter size hail. SOURCE...Radar indicated. IMPACT...Damage to vehicles is expected. Locations impacted include... Marengo, Walford, Norway, Amana, Upper South Amana, East Amana, West Amana, Homestead, High Amana, Middle Amana, Cedar Rapids, Swisher, Cedar Rapids Municipal Airport, F.W. Kent Park, Shueyville, Cou Falls, Coralville, North Liberty, Tiffin, Sandy Beach Camp Ground and Ely. This includes Interstate 380 between mile markers 1 and 13. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a sturdy building. && LAT...LON 4179 9218 4194 9214 4187 9156 4170 9159 TIME...MOT...LOC 1001Z 280DEG 27KT 4184 9205 HAIL THREAT...OBSERVED MAX HAIL SIZE...1.00 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...<50 MPH $$ Gross Action: Expired Issued At: 2026-08-12 05:27:06 638 WWUS53 KDVN 121026 SVSDVN Severe Weather Statement National Weather Service Quad Cities IA/IL 526 AM CDT Wed Aug 12 2026 IAC011-095-103-113-121036- /O.EXP.KDVN.SV.W.0256.000000T0000Z-260812T1030Z/ Johnson IA-Benton IA-Linn IA-Iowa IA- 526 AM CDT Wed Aug 12 2026 ...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN JOHNSON... SOUTHEASTERN BENTON...SOUTHWESTERN LINN AND NORTHEASTERN IOWA COUNTIES WILL EXPIRE AT 530 AM CDT... The storm which prompted the warning has weakened below severe limits, and no longer poses an immediate threat to life or property. Therefore, the warning will be allowed to expire. However, small hail and heavy rain are still possible with this thunderstorm. && LAT...LON 4179 9218 4194 9214 4187 9156 4170 9159 TIME...MOT...LOC 1026Z 275DEG 34KT 4182 9175 $$ Gross | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||