During the evening of Sunday, August 9th, a storm developed in Carver County, west of the NWS office. Several more storms developed and trained over the same areas that affected eastern Carver, far northern Scott, and southern Hennepin Counties for an hour. The storms were difficult to recognize the severity at first as they developed nearly overhead from the radar location in Chanhassen.
Once the storms weakened over southern Hennepin County, more storms reformed northwest of the Twin Cities, and again produced very large hail around Buffalo, Montrose, Hanover, Rockford, and Loretto.  These storms propagated east-southeast toward the western suburbs of the Twin Cities and produced damaging hail between Lake Minnetonka, Eden Prairie and Edina. Slowly, the storms began to propagate to the southeast across south-central Minnesota, by the early morning.
There was a period where hailstones were as large as baseballs (based on pictures from social media) across the western metro area. The two areas that had pictures of the largest stones were Loretto and Victoria.
Based on social media pictures, radar, and MRMS information, there were four areas that likely had hail up to baseball size hail, or possibly greater. The first area was the southern part of Kanabec County. The second area was from southeast Wright County, eastward across Hennepin between Lake Minnetonka to Edina. The third area was near Jordan, southeast to Lydia in Scott County. The fourth area was along the Dakota, Rice County line near Northfield.
Another unique part of these storms is that the hail was nearly continuous for 5 to 15 minutes, and some of the larger hailstones caused significant damage to cars and roofs.
In addition to all of the hail reports, several lines of thunderstorms that continued over the same areas, produced a wide area of very heavy rainfall reports with the heaviest at the NWS office at 5.53 inches. Reports between two and four inches that weren't included in the event were concentrated between Victoria, Chanhassen, Shakopee, Eden Prairie, Bloomington and Lake Minnetonka.

Hail in WRIGHT, MINNESOTA
From 09-AUG-20 22:13:00 to 09-AUG-20 22:30:00 (CST-6)
Location: HANOVER
Magnitude: 1.75 
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Trained Spotter

There were a few reports of large hail, the largest measuring golf ball size, occurred west of Hanover, to the community of Hanover, and moved eastward over the Wright, Hennepin County line.

Hail in WRIGHT, MINNESOTA
From 09-AUG-20 22:40:00 to 09-AUG-20 23:05:00 (CST-6)
Location: BUFFALO
Magnitude: 2.00 
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Trained Spotter

There were numerous reports of large hail, the largest measured at 2 inches in diameter, occurred across Wright County. Based on radar, and observations, there was a swath of hail between Buffalo, and Montrose, including the towns, that moved eastward toward the Hennepin County line near Rockford. There was also likely large hail west of Buffalo but due to the time of night and the rural area, there were no reports and is not included here.

Hail in WRIGHT, MINNESOTA
From 09-AUG-20 23:35:00 to 09-AUG-20 23:35:00 (CST-6)
Location: BUFFALO MUNI ARPT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in HENNEPIN, MINNESOTA
From 09-AUG-20 23:05:00 to 09-AUG-20 23:40:00 (CST-6)
Location: ROCKFORD
Magnitude: 2.50 
Property damage: 500.00K
Crop damage: 0.00K
Reported by: Trained Spotter

There were numerous reports of very large hail, up to tennis ball size, that occurred from Rockford, east-southeast along Highway 55, toward Medina, and eastward to Plymouth. The largest hailstone was measured in the town of Loretto where the 2.5-inch diameter hail fell around 2325 LST. Damage was reported to roofs and cars.

Hail in HENNEPIN, MINNESOTA
From 09-AUG-20 23:40:00 to 09-AUG-20 23:55:00 (CST-6)
Location: HAMEL
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Spotters reported one inch hail, but the size and severity of the hailstones decreased after 2345 LST as the storm moved toward a more populated area of the Twin Cities metro area. However, as the severity of the hail decreased, more downbursts and straight-line winds started to develop.

Hail in HENNEPIN, MINNESOTA
From 10-AUG-20 00:35:00 to 10-AUG-20 00:45:00 (CST-6)
Location: EDINA
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

There were a few reports of large hail, up to golf ball size, the occurred around Edina and Richfield. Local radar indicated that the hail was likely more widespread in southern Hennepin County but due to the time of night it wasn't reported. There were also reports of tree limbs blown down across the area where the hail fell.

Hail in DAKOTA, MINNESOTA
From 10-AUG-20 01:07:00 to 10-AUG-20 01:07:00 (CST-6)
Location: EAGAN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in SCOTT, MINNESOTA
From 10-AUG-20 01:17:00 to 10-AUG-20 01:27:00 (CST-6)
Location: LYDIA
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

There were two reports of large hail in Scott County, the largest was in Spring Lake Township where a 1.75-inch diameter hailstone was measured. Radar indicated that the largest and most widespread area of hail fell south and east of Prior Lake, toward the Scott, Dakota County line.

Hail in DAKOTA, MINNESOTA
From 10-AUG-20 01:16:00 to 10-AUG-20 01:16:00 (CST-6)
Location: INVER GROVE HEIGHTS
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

This was the largest hailstone reported in Dakota County from this set of storms. Radar indicated that the hail was likely largest in size and areal extent from Eagan, eastward to Inver Grove Heights, and toward the Dakota, Washington County line.

Hail in WRIGHT, MINNESOTA
From 10-AUG-20 01:40:00 to 10-AUG-20 01:45:00 (CST-6)
Location: BUFFALO
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

There were several reports of large hail in the city of Buffalo, with the largest hailstone measured at 2 inches.

Hail in WRIGHT, MINNESOTA
From 10-AUG-20 02:02:00 to 10-AUG-20 02:02:00 (CST-6)
Location: HANOVER
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

There was likely severe hail east into Hennepin County but the time of night and rural area kept reports minimal.

Hail in KANABEC, MINNESOTA
From 10-AUG-20 02:30:00 to 10-AUG-20 02:45:00 (CST-6)
Location: OGILVIE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

There was a measured hailstone of 1 inch in diameter south of Ogilvie. Local radar showed a wider area of higher returns west and east of Ogilvie where larger hail likely fell. There was measured hailstone of 1.5 inches in southern Pine County as the storm moved east of Kanabec County.

Hail in RICE, MINNESOTA
From 10-AUG-20 02:35:00 to 10-AUG-20 02:45:00 (CST-6)
Location: NORTHFIELD
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

There was a picture of a 1.5-inch hailstone in Northfield.

Hail in HENNEPIN, MINNESOTA
From 10-AUG-20 02:35:00 to 10-AUG-20 02:35:00 (CST-6)
Location: ROBBINSDALE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

There was likely larger hail to the west and north of Robbinsdale as local radar had higher returns in this area.

Hail in SHERBURNE, MINNESOTA
From 10-AUG-20 02:46:00 to 10-AUG-20 02:46:00 (CST-6)
Location: ORROCK
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in STEELE, MINNESOTA
From 10-AUG-20 04:06:00 to 10-AUG-20 04:06:00 (CST-6)
Location: LEMOND
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in WASECA, MINNESOTA
From 10-AUG-20 07:34:00 to 10-AUG-20 07:36:00 (CST-6)
Location: NEW RICHLAND
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in HENNEPIN, MINNESOTA
From 10-AUG-20 00:41:00 to 10-AUG-20 00:41:00 (CST-6)
Location: FLYING CLOUD ARPT
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

A trained spotter next to the airport reported numerous trees down and large street lights blown down on Flying Cloud Drive.

Thunderstorm Wind in HENNEPIN, MINNESOTA
From 10-AUG-20 00:45:00 to 10-AUG-20 00:45:00 (CST-6)
Location: MSP INTL ARPT
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Hail in HENNEPIN, MINNESOTA
From 09-AUG-20 22:30:00 to 09-AUG-20 22:40:00 (CST-6)
Location: GREENWOOD
Magnitude: 1.75 
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Trained Spotter

This is a continuation line of severe hail, up to golf ball size, that moved out of Wright County near Hanover, eastward to between Roger and Corcoran. Residents and spotters just southeast of Hanover reported the hail was up to golf ball size.

Hail in DAKOTA, MINNESOTA
From 10-AUG-20 01:48:00 to 10-AUG-20 01:48:00 (CST-6)
Location: FARMINGTON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in HENNEPIN, MINNESOTA
From 10-AUG-20 00:35:00 to 10-AUG-20 00:35:00 (CST-6)
Location: BLOOMINGTON
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

A large tree was uprooted near the intersection of West 84th Street, and Stanley Avenue South. There was also a measured wind report of 55 mph near the area from a private weather station.

Heavy Rain in CARVER, MINNESOTA
From 09-AUG-20 18:00:00 to 10-AUG-20 06:00:00 (CST-6)
Location: CHANHASSEN
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

A measured rainfall report of 4.47 inches in Chanhassen.

Heavy Rain in CARVER, MINNESOTA
From 09-AUG-20 18:00:00 to 10-AUG-20 06:00:00 (CST-6)
Location: CHANHASSEN
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

A measured rainfall report of 4.72 inches in Chanhassen.

Heavy Rain in CARVER, MINNESOTA
From 09-AUG-20 18:00:00 to 10-AUG-20 06:00:00 (CST-6)
Location: CHANHASSEN
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

A measured rainfall report of 5.53 inches in Chanhassen.

Heavy Rain in CARVER, MINNESOTA
From 09-AUG-20 18:00:00 to 10-AUG-20 06:00:00 (CST-6)
Location: VICTORIA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A measured rainfall report of 4.52 inches in Victoria.

Heavy Rain in CARVER, MINNESOTA
From 09-AUG-20 18:00:00 to 10-AUG-20 06:00:00 (CST-6)
Location: CHANHASSEN
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

A measured rainfall report of 4.59 inches in Chanhassen.

Heavy Rain in HENNEPIN, MINNESOTA
From 09-AUG-20 18:00:00 to 10-AUG-20 06:00:00 (CST-6)
Location: EDEN PRAIRIE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

A measured rainfall report of 4.83 inches in Eden Prairie.

Heavy Rain in HENNEPIN, MINNESOTA
From 09-AUG-20 18:00:00 to 10-AUG-20 06:00:00 (CST-6)
Location: FLYING CLOUD ARPT
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

A measured rainfall report of 4.20 inches at the Flying Cloud Airport.

Hail in WRIGHT, MINNESOTA
From 10-AUG-20 01:30:00 to 10-AUG-20 01:30:00 (CST-6)
Location: BUFFALO
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Most hail was smaller.

Hail in STEELE, MINNESOTA
From 10-AUG-20 04:15:00 to 10-AUG-20 04:15:00 (CST-6)
Location: MERTON
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

A photograph of the hail was posted to a Skywarn group social media page.

Hail in RICE, MINNESOTA
From 10-AUG-20 02:05:00 to 10-AUG-20 02:05:00 (CST-6)
Location: WEBSTER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in RICE, MINNESOTA
From 10-AUG-20 04:25:00 to 10-AUG-20 04:30:00 (CST-6)
Location: KENYON
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

A photograph of the hail was posted to a Skywarn group social media page.

Hail in DAKOTA, MINNESOTA
From 10-AUG-20 01:45:00 to 10-AUG-20 01:45:00 (CST-6)
Location: LAKEVILLE AIRLAKE AR
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A few dents were noted in gutters and downspouts.

Hail in DAKOTA, MINNESOTA
From 10-AUG-20 02:25:00 to 10-AUG-20 02:35:00 (CST-6)
Location: NORTHFIELD
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Two trained spotters reported hail on the north side of Northfield, and both provided photographs of the hail.

Hail in HENNEPIN, MINNESOTA
From 10-AUG-20 00:51:00 to 10-AUG-20 00:54:00 (CST-6)
Location: RICHFIELD
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotters reported 1.00 to 1.25 inch hail from northern Richfield to the extreme eastern part of Bloomington, just south of MSP International Airport.

Thunderstorm Wind in HENNEPIN, MINNESOTA
From 09-AUG-20 22:30:00 to 09-AUG-20 22:30:00 (CST-6)
Location: GREENFIELD
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

About one dozen trees and large branches were knocked down, all blown from east to west.

Hail in CARVER, MINNESOTA
From 09-AUG-20 20:27:00 to 09-AUG-20 21:05:00 (CST-6)
Location: VICTORIA
Magnitude: 2.75 
Property damage: 500.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Numerous sources from social media pictures, to trained spotters and official NWS observations, reported and measured very large hail for nearly 40 minutes from Victoria, eastward to the Carver, Hennepin County line. This includes some of the smaller communities between the two towns.
The largest hailstone was measured at 2.75 inches in diameter and fell near Victoria. Two inch hail was measured at the NWS office. Due to the large hail size and almost a continuous line of storms redeveloping in the same areas, many roofs and cars were damaged.

Hail in HENNEPIN, MINNESOTA
From 09-AUG-20 20:55:00 to 09-AUG-20 21:30:00 (CST-6)
Location: EDEN PRAIRIE
Magnitude: 1.25 
Property damage: 500.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Numerous sources from social media pictures to trained spotters reported and measured very large hail for nearly 35 minutes from the Carver, Hennepin County line east to Eden Prairie, and Bloomington. The largest hailstone was measured at 1.25 inches in diameter and fell in West Bloomington. Radar suggested larger hail was possible, but there were no pictures or observations to indicate any larger hailstones. Many roofs and cars were damaged.

Hail in HENNEPIN, MINNESOTA
From 09-AUG-20 21:03:00 to 09-AUG-20 21:03:00 (CST-6)
Location: EDEN PRAIRIE
Magnitude: 2.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in HENNEPIN, MINNESOTA
From 09-AUG-20 21:30:00 to 09-AUG-20 21:45:00 (CST-6)
Location: BLOOMINGTON
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Severe hail slowly decreased in size as it moved across Bloomington, with the largest measured hail size of 1.25 inches.

Hail in WRIGHT, MINNESOTA
From 09-AUG-20 21:50:00 to 09-AUG-20 22:05:00 (CST-6)
Location: ST MICHAEL
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

One report of quarter size hail was observed near St. Michaels. However, based on radar and similar reports earlier in the evening, there were likely larger hailstones west of St. Michaels, near Pelican Lake, and eastward through the town.