On the morning of the 13th, one large supercell tracked across southwest Benson County (ND) and western Eddy County (ND). This storm tracked southeast toward northern Barnes County (ND), then weakened as it moved into Cass County (ND). A second large supercell then developed in Towner County (ND) and tracked toward Thompson, ND. As the second storm moved into southeast Grand Forks County (ND), additional storms developed to the east along and just south of the U.S. Highway 2 corridor in Minnesota. As the second supercell moved across eastern Ramsey and northern Nelson Counties (in ND), it displayed a classic hook echo on radar.

Hail in GRAND FORKS, NORTH DAKOTA
From 13-AUG-07 15:43:00 to 13-AUG-07 15:43:00 (CST-6)
Location: REYNOLDS
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in TRAILL, NORTH DAKOTA
From 13-AUG-07 15:36:00 to 13-AUG-07 15:43:00 (CST-6)
Location: REYNOLDS
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Most of the hail was 1.25 inches in diameter, with some 1.50 inch hailstones mixed in.

Hail in TRAILL, NORTH DAKOTA
From 13-AUG-07 15:44:00 to 13-AUG-07 15:44:00 (CST-6)
Location: REYNOLDS
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in BENSON, NORTH DAKOTA
From 13-AUG-07 09:20:00 to 13-AUG-07 09:20:00 (CST-6)
Location: ESMOND
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in BENSON, NORTH DAKOTA
From 13-AUG-07 09:35:00 to 13-AUG-07 09:35:00 (CST-6)
Location: MADDOCK RICES ARPT
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in EDDY, NORTH DAKOTA
From 13-AUG-07 09:50:00 to 13-AUG-07 09:50:00 (CST-6)
Location: MUNSTER
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in GRIGGS, NORTH DAKOTA
From 13-AUG-07 10:56:00 to 13-AUG-07 10:56:00 (CST-6)
Location: REVERE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in GRAND FORKS, NORTH DAKOTA
From 13-AUG-07 14:31:00 to 13-AUG-07 14:31:00 (CST-6)
Location: NIAGARA
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in GRAND FORKS, NORTH DAKOTA
From 13-AUG-07 14:40:00 to 13-AUG-07 14:45:00 (CST-6)
Location: LARIMORE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in GRAND FORKS, NORTH DAKOTA
From 13-AUG-07 14:50:00 to 13-AUG-07 14:50:00 (CST-6)
Location: ARVILLA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Tornado in NELSON, NORTH DAKOTA
From 13-AUG-07 13:40:00 to 13-AUG-07 13:48:00 (CST-6)
Location: WHITMAN
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

This tornado originated in Walsh County at 138 pm CST, and it crossed into Nelson County about 140 pm CST. The total tornado track was about 6 miles, and about 5 miles of the total occurred in Nelson County. The tornado broke down several trees in shelterbelts and swirled crop swathes in its path. Peak wind speeds were estimated at 80 mph.

Hail in GRAND FORKS, NORTH DAKOTA
From 13-AUG-07 15:06:00 to 13-AUG-07 15:06:00 (CST-6)
Location: OJATA
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Tornado in WALSH, NORTH DAKOTA
From 13-AUG-07 13:38:00 to 13-AUG-07 13:40:00 (CST-6)
Location: LANKIN
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

The tornado tracked intermittently to the southeast, from about 3 miles northwest of Whitman to the Nelson County line about 2.5 miles north-northwest of Whitman. The tornado continued to the southeast into Nelson County, where it dissipated at 148 pm CST. The total tornado track was about 6 miles, with about 1 mile of that total occurring in Walsh County. The portion of the tornado track in Walsh County was mainly across wetlands. Peak wind speeds were estimated at 80 mph.

Hail in WALSH, NORTH DAKOTA
From 13-AUG-07 13:43:00 to 13-AUG-07 13:43:00 (CST-6)
Location: LANKIN
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail covered the ground.

Hail in EDDY, NORTH DAKOTA
From 13-AUG-07 09:58:00 to 13-AUG-07 09:58:00 (CST-6)
Location: NEW ROCKFORD ARPT
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in BARNES, NORTH DAKOTA
From 13-AUG-07 11:00:00 to 13-AUG-07 11:05:00 (CST-6)
Location: DAZEY BRYN ARPT
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in GRAND FORKS, NORTH DAKOTA
From 13-AUG-07 15:08:00 to 13-AUG-07 15:08:00 (CST-6)
Location: HOLMES
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Hail in GRAND FORKS, NORTH DAKOTA
From 13-AUG-07 15:22:00 to 13-AUG-07 15:22:00 (CST-6)
Location: HOLMES
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The hail occurred in Holmes.

Hail in TOWNER, NORTH DAKOTA
From 13-AUG-07 12:25:00 to 13-AUG-07 12:25:00 (CST-6)
Location: NEWVILLE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in RAMSEY, NORTH DAKOTA
From 13-AUG-07 13:00:00 to 13-AUG-07 13:00:00 (CST-6)
Location: DERRICK
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Funnel Cloud in GRAND FORKS, NORTH DAKOTA
From 13-AUG-07 15:15:00 to 13-AUG-07 15:15:00 (CST-6)
Location: NORTHWOOD
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

The funnel was observed 4 miles north of Hatton on highway 18.

Hail in TRAILL, NORTH DAKOTA
From 13-AUG-07 15:25:00 to 13-AUG-07 15:25:00 (CST-6)
Location: REYNOLDS
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

The hail was reported by a deputy on county road 25, about 2 miles west of Reynolds.

Hail in CAVALIER, NORTH DAKOTA
From 13-AUG-07 12:40:00 to 13-AUG-07 12:40:00 (CST-6)
Location: WEAVER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

The hail fell near the Cavalier and Ramsey County line.

Hail in RAMSEY, NORTH DAKOTA
From 13-AUG-07 12:43:00 to 13-AUG-07 12:43:00 (CST-6)
Location: ST JOE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

The hail fell near the Cavalier and Ramsey County line.

Hail in RAMSEY, NORTH DAKOTA
From 13-AUG-07 13:20:00 to 13-AUG-07 13:20:00 (CST-6)
Location: EDMORE
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Hail in WALSH, NORTH DAKOTA
From 13-AUG-07 13:38:00 to 13-AUG-07 13:38:00 (CST-6)
Location: LANKIN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Hail in WALSH, NORTH DAKOTA
From 13-AUG-07 13:45:00 to 13-AUG-07 13:45:00 (CST-6)
Location: LANKIN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in NELSON, NORTH DAKOTA
From 13-AUG-07 13:55:00 to 13-AUG-07 13:55:00 (CST-6)
Location: PETERSBURG
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The largest hail ranged in size from 1.75 to 2 inches.

Hail in NELSON, NORTH DAKOTA
From 13-AUG-07 14:20:00 to 13-AUG-07 14:20:00 (CST-6)
Location: PETERSBURG
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in GRAND FORKS, NORTH DAKOTA
From 13-AUG-07 14:25:00 to 13-AUG-07 14:25:00 (CST-6)
Location: NIAGARA
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in GRAND FORKS, NORTH DAKOTA
From 13-AUG-07 15:34:00 to 13-AUG-07 15:34:00 (CST-6)
Location: THOMPSON
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in GRAND FORKS, NORTH DAKOTA
From 13-AUG-07 15:08:00 to 13-AUG-07 15:08:00 (CST-6)
Location: THOMPSON
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

The ground was white with hail. Some car damage was reported.

Hail in BENSON, NORTH DAKOTA
From 13-AUG-07 09:35:00 to 13-AUG-07 09:35:00 (CST-6)
Location: MADDOCK RICES ARPT
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in CASS, NORTH DAKOTA
From 13-AUG-07 12:20:00 to 13-AUG-07 12:20:00 (CST-6)
Location: PROSPER
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter