An impressive set up for severe weather occurred on the evening of the 30th. A surface low set up near Fargo with a warm front extending out to its east. Meanwhile, a cold front extended to the south, down into central Nebraska. In the warm sector, temperatures climbed into the low to mid 80s with dew points in the middle 60s. As convection blossomed in the evening, thunderstorms erupted all along the cold front, from North Dakota all the way down into Nebraska.

Thunderstorm Wind in POLK, MINNESOTA
From 30-MAY-11 21:00:00 to 30-MAY-11 21:00:00 (CST-6)
Location: FISHER
Magnitude: 59.00 EG
Reported by: Amateur Radio

The strong wind gust occurred at Fisher.

Thunderstorm Wind in MAHNOMEN, MINNESOTA
From 30-MAY-11 20:53:00 to 30-MAY-11 20:53:00 (CST-6)
Location: MAHNOMEN
Magnitude: 50.00 MG
Reported by: Mesonet

The wind gust was measured by an MNDOT RWIS sensor.

Thunderstorm Wind in CLAY, MINNESOTA
From 30-MAY-11 19:57:00 to 30-MAY-11 19:57:00 (CST-6)
Location: DILWORTH
Magnitude: 52.00 MG
Reported by: Mesonet

The Dilworth MNDOT RWIS recorded a wind gust of 60 mph.

Thunderstorm Wind in PENNINGTON, MINNESOTA
From 30-MAY-11 21:38:00 to 30-MAY-11 21:38:00 (CST-6)
Location: THIEF RIVER FALLS
Magnitude: 55.00 EG
Reported by: NWS Storm Survey

Several 6 to 8 inch diameter poplar trees were blown down in shelterbelts.

Thunderstorm Wind in NORMAN, MINNESOTA
From 30-MAY-11 20:26:00 to 30-MAY-11 20:26:00 (CST-6)
Location: ADA
Magnitude: 52.00 MG
Reported by: Mesonet

The wind gust was measured by a NDSU NDAWN mesonet sensor.

Thunderstorm Wind in CLAY, MINNESOTA
From 30-MAY-11 20:00:00 to 30-MAY-11 20:00:00 (CST-6)
Location: MOORHEAD
Magnitude: 60.00 EG
Reported by: Law Enforcement

A semi truck was blown over along Interstate 94 at mile marker six.

Thunderstorm Wind in POLK, MINNESOTA
From 30-MAY-11 20:48:00 to 30-MAY-11 20:48:00 (CST-6)
Location: ELDRED
Magnitude: 53.00 MG
Reported by: Mesonet

The wind gust was measured by the Eldred NDSU NDAWN mesonet site.

Thunderstorm Wind in OTTER TAIL, MINNESOTA
From 30-MAY-11 21:00:00 to 30-MAY-11 21:00:00 (CST-6)
Location: OTTERTAIL
Magnitude: 55.00 EG
Reported by: Law Enforcement

A roof was blown off a building.

Thunderstorm Wind in MARSHALL, MINNESOTA
From 30-MAY-11 21:50:00 to 30-MAY-11 21:50:00 (CST-6)
Location: MIDDLE RIVER
Magnitude: 55.00 EG
Reported by: NWS Storm Survey

Several 10 to 12 inch diameter poplar trees were blown down.

Thunderstorm Wind in KITTSON, MINNESOTA
From 30-MAY-11 21:50:00 to 30-MAY-11 21:50:00 (CST-6)
Location: PELAU
Magnitude: 52.00 EG
Reported by: NWS Storm Survey

A few poplar trees were blown down in a shelterbelt.

Flash Flood in GRANT, MINNESOTA
From 30-MAY-11 21:15:00 to 31-MAY-11 04:00:00 (CST-6)
Location: HERMAN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Several roads were overtopped with water and there were also reports of flooded basements.

Tornado in HUBBARD, MINNESOTA
From 30-MAY-11 21:35:00 to 30-MAY-11 21:44:00 (CST-6)
Location: PARK RAPIDS
Tornado F-scale: EF1
Property damage: 600.00K
Reported by: NWS Storm Survey

This tornado tracked for about six miles and was likely enshrouded in downburst winds and heavy rain along much of its path. Several sections of center pivot irrigation systems were flipped. Numerous large trees were uprooted or snapped and shingles and roofing materials were scattered about. Peak winds were estimated at 105 mph.

Thunderstorm Wind in ROSEAU, MINNESOTA
From 30-MAY-11 22:05:00 to 30-MAY-11 22:05:00 (CST-6)
Location: SKIME
Magnitude: 52.00 EG
Reported by: Amateur Radio

A few smaller 5 to 8 inch diameter trees were blown down in a shelterbelt.

Tornado in CLAY, MINNESOTA
From 30-MAY-11 20:01:00 to 30-MAY-11 20:05:00 (CST-6)
Location: MOORHEAD
Tornado F-scale: EF1
Property damage: 250.00K
Reported by: NWS Storm Survey

This tornado tracked north-northeastward along the eastern edge of Moorhead and was likely enshrouded in downburst winds and heavy rain. A few wooden power poles were snapped and numerous trees were uprooted or snapped. Some mature trees were thrown more than 100 feet. Peak winds were estimated at 105 mph.

Tornado in POLK, MINNESOTA
From 30-MAY-11 20:26:00 to 30-MAY-11 20:39:00 (CST-6)
Location: ELDRED
Tornado F-scale: EF1
Property damage: 50.00K
Reported by: NWS Storm Survey

This tornado tracked intermittently to the northeast for about nine miles. A 30x40 foot wooden shed was completely blown off its foundation and destroyed in one farmyard. Numerous trees were snapped in shelterbelts along its path. Peak winds were estimated at 105 mph.

Thunderstorm Wind in NORMAN, MINNESOTA
From 30-MAY-11 20:30:00 to 30-MAY-11 20:30:00 (CST-6)
Location: HALSTAD
Magnitude: 52.00 EG
Property damage: 300.00K
Reported by: Public

Numerous trees were blown down in farmsteads and communities across western Norman County.  In Halstad and Ada, broken tree limbs crushed vehicles and severly damaged roofing on numerous homes.

Thunderstorm Wind in POLK, MINNESOTA
From 30-MAY-11 21:00:00 to 30-MAY-11 21:05:00 (CST-6)
Location: CROOKSTON
Magnitude: 55.00 EG
Property damage: 400.00K
Reported by: Amateur Radio

There were many reports of damage around Crookston, with many trees, power lines, and street signs blown over. A small shed was blown down and falling tree limbs damaged the roofs of numerous homes.

Thunderstorm Wind in BELTRAMI, MINNESOTA
From 30-MAY-11 22:10:00 to 30-MAY-11 22:10:00 (CST-6)
Location: BIRCHMONT
Magnitude: 52.00 EG
Reported by: Amateur Radio

A tree was blown down on county road 22 north of Bemidji.