Scattered convection persisted trough the afternoon within an area of warm air advection before becoming more organized in the evening, resulting in a few severe wind gusts in west central Iowa. Later in the evening convection that had been across the northern plains through the day spread into northern Iowa. When this convection interacted with the strongly unstable airmass across Iowa and outflow boundaries from earlier evening convection it organized into a convective line, producing wind gusts and hail across northern Iowa. The motion of the line resulted in training thunderstorms and some areas received six to seven inches of rain. This rain fell of areas of persistent drought so while amounts were heavy there were no reports of flooding in the area.

Thunderstorm Wind in POWESHIEK, IOWA
From 26-AUG-21 19:58:00 to 26-AUG-21 19:58:00 (CST-6)
Location: SEARSBORO
Magnitude: 55.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Gust measured via personal weather station.

Thunderstorm Wind in POWESHIEK, IOWA
From 26-AUG-21 20:00:00 to 26-AUG-21 20:00:00 (CST-6)
Location: MONTEZUMA
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Small tree limbs down. Gust measured by personal weather station. Time estimated via radar.

Thunderstorm Wind in POWESHIEK, IOWA
From 26-AUG-21 20:00:00 to 26-AUG-21 20:00:00 (CST-6)
Location: MONTEZUMA
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Storm chaser reports trees down and damage to outbuildings. Time estimated via radar.

Heavy Rain in POWESHIEK, IOWA
From 26-AUG-21 19:00:00 to 26-AUG-21 21:00:00 (CST-6)
Location: MONTEZUMA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Storm total rainfall of 2.13 inches.

Hail in EMMET, IOWA
From 26-AUG-21 22:42:00 to 26-AUG-21 22:42:00 (CST-6)
Location: WELLINGFORD
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

KICD reported nickel sized hail.

Thunderstorm Wind in PALO ALTO, IOWA
From 26-AUG-21 22:54:00 to 26-AUG-21 22:54:00 (CST-6)
Location: GRAETTINGER
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Large trees down. Delayed report, time estimated via radar.

Thunderstorm Wind in PALO ALTO, IOWA
From 26-AUG-21 23:03:00 to 26-AUG-21 23:03:00 (CST-6)
Location: OSGOOD
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Large trees down. Delayed report, time estimated via radar.

Hail in KOSSUTH, IOWA
From 27-AUG-21 03:00:00 to 27-AUG-21 03:00:00 (CST-6)
Location: SEXTON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public report of quarter sized hail.

Heavy Rain in WORTH, IOWA
From 26-AUG-21 05:35:00 to 27-AUG-21 05:35:00 (CST-6)
Location: FERTILE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A 24 hour rainfall of 3.47 inches.

Heavy Rain in WORTH, IOWA
From 26-AUG-21 05:38:00 to 27-AUG-21 05:38:00 (CST-6)
Location: GRAFTON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A 24 hour rainfall of 2.19 inches.

Heavy Rain in EMMET, IOWA
From 26-AUG-21 05:48:00 to 27-AUG-21 05:48:00 (CST-6)
Location: RINGSTED
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

A 24 hour rainfall of 3.55 inches.

Heavy Rain in KOSSUTH, IOWA
From 26-AUG-21 05:57:00 to 27-AUG-21 05:57:00 (CST-6)
Location: BURT
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

A 24 hour rainfall of 2.26 inches.

Heavy Rain in KOSSUTH, IOWA
From 26-AUG-21 05:57:00 to 27-AUG-21 05:57:00 (CST-6)
Location: SWEA CITY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

A 24 hour rainfall of 5.25 inches.

Heavy Rain in POWESHIEK, IOWA
From 26-AUG-21 06:00:00 to 27-AUG-21 06:00:00 (CST-6)
Location: MONTEZUMA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

A 24 hour rainfall of 3.45 inches.

Heavy Rain in POWESHIEK, IOWA
From 26-AUG-21 06:00:00 to 27-AUG-21 06:00:00 (CST-6)
Location: GRINNELL ARPT
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

A 24 hour rainfall of 2.22 inches.

Heavy Rain in EMMET, IOWA
From 26-AUG-21 06:00:00 to 27-AUG-21 06:00:00 (CST-6)
Location: ESTHERVILLE ARPT
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

A 24 hour rainfall of 2.84 inches.

Heavy Rain in MAHASKA, IOWA
From 26-AUG-21 08:30:00 to 27-AUG-21 08:30:00 (CST-6)
Location: OSKALOOSA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A 24 hour rainfall of 2.04 inches.

Heavy Rain in KOSSUTH, IOWA
From 26-AUG-21 09:17:00 to 27-AUG-21 09:17:00 (CST-6)
Location: ALGONA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A 24 hour rainfall of 7.00 inches.

Heavy Rain in EMMET, IOWA
From 26-AUG-21 09:30:00 to 27-AUG-21 09:30:00 (CST-6)
Location: RINGSTED
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

A 24 hour rainfall of 6.50 inches.

Heavy Rain in EMMET, IOWA
From 26-AUG-21 09:30:00 to 27-AUG-21 09:30:00 (CST-6)
Location: RINGSTED
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

A 24 hour rainfall of 3.55 inches.

Heavy Rain in EMMET, IOWA
From 26-AUG-21 09:30:00 to 27-AUG-21 09:30:00 (CST-6)
Location: WELLINGFORD
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

A 24 hour rainfall of 6.60 inches.