A complex of thunderstorms developed across North Dakota Tuesday morning, July 27, and moved into northwest Minnesota. Several areas of strong storms and heavy rainfall occurred in central Minnesota during the morning hours. However, as afternoon heating started, another round of thunderstorms developed across west-central Minnesota, and quickly moved eastward into east-central Minnesota, and west-central Wisconsin during the evening hours and caused several areas of straight-line wind damage. In addition, numerous weather stations, private and government owned across central Minnesota, measured wind speeds over 50 mph.

Thunderstorm Wind in MILLE LACS, MINNESOTA
From 27-JUL-10 17:09:00 to 27-JUL-10 17:10:00 (CST-6)
Location: PAGE
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A Minnesota Department of Transportation road weather station measured a wind gust of 56 knots, 8 miles north of Milaca, Minnesota.

Thunderstorm Wind in STEARNS, MINNESOTA
From 27-JUL-10 16:55:00 to 27-JUL-10 16:57:00 (CST-6)
Location: RICHMOND
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

An eight inch diameter tree was uprooted.

Thunderstorm Wind in MORRISON, MINNESOTA
From 27-JUL-10 16:30:00 to 27-JUL-10 16:32:00 (CST-6)
Location: PIERZ
Magnitude: 52.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Several trees and power lines were blown down near Pierz, Minnesota.

Thunderstorm Wind in KANABEC, MINNESOTA
From 27-JUL-10 17:10:00 to 27-JUL-10 17:22:00 (CST-6)
Location: OGILVIE
Magnitude: 56.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

An area of straight-line winds blew across portions of Kanabec County between Ogilvie and Grass Lake Township where numerous trees were uprooted and power lines were downed.

Thunderstorm Wind in MILLE LACS, MINNESOTA
From 27-JUL-10 17:10:00 to 27-JUL-10 17:22:00 (CST-6)
Location: FORESTON
Magnitude: 56.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Straight-line winds blew down numerous trees and power lines from near Foreston, northeast to Borgholm Township, and Bock in Mille Lacs County.

Thunderstorm Wind in CHISAGO, MINNESOTA
From 27-JUL-10 17:40:00 to 27-JUL-10 17:41:00 (CST-6)
Location: RUSH CITY
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A few trees were uprooted near Rush City, Minnesota.

Thunderstorm Wind in SHERBURNE, MINNESOTA
From 27-JUL-10 17:23:00 to 27-JUL-10 17:25:00 (CST-6)
Location: CLEAR LAKE
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Several trees were uprooted in Clear Lake, Minnesota.

Thunderstorm Wind in SHERBURNE, MINNESOTA
From 27-JUL-10 17:35:00 to 27-JUL-10 17:37:00 (CST-6)
Location: LAKE FREMONT
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A few trees were uprooted and landing on power lines near Zimmerman, Minnesota.

Thunderstorm Wind in CHISAGO, MINNESOTA
From 27-JUL-10 18:00:00 to 27-JUL-10 18:02:00 (CST-6)
Location: CHISAGO CITY
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Several trees were blown down near Chisago City, Minnesota.

Thunderstorm Wind in ANOKA, MINNESOTA
From 27-JUL-10 18:30:00 to 27-JUL-10 18:32:00 (CST-6)
Location: ANOKA
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

A 12 inch diameter tree limb was blown down north of Anoka, Minnesota.

Thunderstorm Wind in STEARNS, MINNESOTA
From 27-JUL-10 16:27:00 to 27-JUL-10 16:28:00 (CST-6)
Location: SAUK CENTRE ARPT
Magnitude: 58.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A Minnesota Department of Transportation automated weather station measured a 58 knot wind gust near Sauk Centre, Minnesota.

Thunderstorm Wind in STEARNS, MINNESOTA
From 27-JUL-10 17:11:00 to 27-JUL-10 17:18:00 (CST-6)
Location: WHITNEY MEML ARPT
Magnitude: 62.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A local automated wind sensor measured a 62 knot wind gust near Veterans Golf Course in Sauk Rapids, Minnesota. In addition, a trained spotter measured a wind gust of 59 mph near Waite Park.

Thunderstorm Wind in TODD, MINNESOTA
From 27-JUL-10 15:50:00 to 27-JUL-10 15:52:00 (CST-6)
Location: LONG PRAIRIE
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Several trees were blown down west of Long Prairie, Minnesota. In addition, there were reports of ponding of water on city streets, and standing water in some farm fields.

Thunderstorm Wind in CHISAGO, MINNESOTA
From 27-JUL-10 17:53:00 to 27-JUL-10 17:55:00 (CST-6)
Location: STARK
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Several trees were uprooted between Oxford Township in far southeast Isanti County, northeast to North Branch in Chisago County.

Thunderstorm Wind in ISANTI, MINNESOTA
From 27-JUL-10 17:50:00 to 27-JUL-10 17:53:00 (CST-6)
Location: WEBER
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Several trees were uprooted between Oxford Township in far southeast Isanti County, northeast to North Branch in Chisago County.

Thunderstorm Wind in MORRISON, MINNESOTA
From 27-JUL-10 16:20:00 to 27-JUL-10 16:25:00 (CST-6)
Location: SOBIESKI
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A damage survey found dozens of scattered trees down in a mile wide swath. The damage was found to be from a downburst.