A surface cold front and remnants of a nocturnal mesoscale convective vortex (MCV) slowly moved across Iowa in the late morning to early afternoon hours. With moderate CAPE in the 1500-3000 J/kg range and shear of 20-30 kts, conditions were sufficient to support severe storm development. Storms produced winds gusting up to 70 mph at times, leaving behind significant tree damage in a few locations across north central and east central Iowa, along with periods of heavy rain.

Thunderstorm Wind in CERRO GORDO, IOWA
From 09-JUL-20 10:45:00 to 09-JUL-20 10:45:00 (CST-6)
Location: (MCW)MASON CITY MUNI
Magnitude: 53.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

ASOS measured a 53 knot wind gust at the Mason City airport.

Heavy Rain in KOSSUTH, IOWA
From 09-JUL-20 09:10:00 to 09-JUL-20 10:10:00 (CST-6)
Location: HANNA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

WHO-13 in Des Moines relayed a report from Kossuth County of 2.6 inches of rain in one hour.

Thunderstorm Wind in BLACK HAWK, IOWA
From 09-JUL-20 11:33:00 to 09-JUL-20 11:33:00 (CST-6)
Location: CEDAR FALLS
Magnitude: 58.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

KWWL relayed reports of large trees uprooted and many tree limbs down throughout town of Cedar Falls. Time estimated by radar.

Thunderstorm Wind in BLACK HAWK, IOWA
From 09-JUL-20 11:35:00 to 09-JUL-20 11:35:00 (CST-6)
Location: FARMER
Magnitude: 58.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public report via social media of crops flattened, many trees uprooted, a playground set demolished, and power outage.

Thunderstorm Wind in BLACK HAWK, IOWA
From 09-JUL-20 11:40:00 to 09-JUL-20 11:40:00 (CST-6)
Location: NORTH CEDAR
Magnitude: 58.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Public

Public report of a large tree crushing a pickup truck. Time estimated via radar.

Thunderstorm Wind in BLACK HAWK, IOWA
From 09-JUL-20 11:40:00 to 09-JUL-20 11:40:00 (CST-6)
Location: CEDAR FALLS
Magnitude: 57.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported large tree uprooted and tree limbs down with damage to the mailbox. Time estimated via radar.

Thunderstorm Wind in BLACK HAWK, IOWA
From 09-JUL-20 11:50:00 to 09-JUL-20 11:50:00 (CST-6)
Location: (ALO)WATERLOO MUNI A
Magnitude: 61.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The Waterloo ASOS reported a gust of 61 knots.

Heavy Rain in BLACK HAWK, IOWA
From 09-JUL-20 11:00:00 to 09-JUL-20 12:45:00 (CST-6)
Location: CEDAR FALLS
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public report of 2.4 inches of rain in 3 hours with rain still falling at time of report.

Heavy Rain in BLACK HAWK, IOWA
From 09-JUL-20 11:25:00 to 09-JUL-20 13:25:00 (CST-6)
Location: FINCHFORD
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Broadcast media KCRG relayed a report of 3 inches of rain in 2.5 hours.

Heavy Rain in BLACK HAWK, IOWA
From 09-JUL-20 10:00:00 to 09-JUL-20 14:00:00 (CST-6)
Location: ORANGE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

KWWL relayed a report of 2.76 inches of rain.

Heavy Rain in BLACK HAWK, IOWA
From 09-JUL-20 11:20:00 to 09-JUL-20 14:00:00 (CST-6)
Location: RAYMOND
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public report of 2.26 inches of rain. Begin time estimated via radar.

Heavy Rain in CERRO GORDO, IOWA
From 09-JUL-20 10:00:00 to 09-JUL-20 14:00:00 (CST-6)
Location: VENTURA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public report of 2.22 inches of rain. Beginning time estimated via radar.

Heavy Rain in CERRO GORDO, IOWA
From 08-JUL-20 15:53:00 to 09-JUL-20 15:53:00 (CST-6)
Location: (MCW)MASON CITY MUNI
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The Mason City ASOS reported a 24 hour rain total of 2.42 inches.

Heavy Rain in BLACK HAWK, IOWA
From 08-JUL-20 16:00:00 to 09-JUL-20 16:00:00 (CST-6)
Location: (ALO)WATERLOO MUNI A
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The Waterloo ASOS reported a 24 hour rain total of 2.19 inches.

Heavy Rain in HUMBOLDT, IOWA
From 09-JUL-20 08:00:00 to 09-JUL-20 12:00:00 (CST-6)
Location: BODE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public report via social media of 2.5 inches of rain. Beginning and ending times estimated via radar.

Thunderstorm Wind in KOSSUTH, IOWA
From 09-JUL-20 09:27:00 to 09-JUL-20 09:27:00 (CST-6)
Location: ALGONA
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency manager reported trees down across Algona.