A slow moving warm front pushed northward across central New York late in the afternoon on April 25th. A warm and relatively moist air mass covered the region, with showers and storms developing, especially in the unstable air south of the frontal boundary, where breaks in the cloud cover allowed temperatures to rise to near 70 degrees. Severe weather developed, and in addition to reports of severe wind damage and hail, plenty of wind shear in the vicinity of the warm front allowed for a few super-cell thunderstorms and tornadoes to develop. In addition, areas of heavy rain caused significant flash flooding in several locations of central New York.

Hail in ONONDAGA, NEW YORK
From 26-APR-11 15:45:00 to 26-APR-11 15:45:00 (EST-5)
Location: SKANEATELES
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in ONONDAGA, NEW YORK
From 26-APR-11 15:46:00 to 26-APR-11 15:46:00 (EST-5)
Location: CAMILLUS
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in ONONDAGA, NEW YORK
From 26-APR-11 15:55:00 to 26-APR-11 15:55:00 (EST-5)
Location: STANLEY MANOR
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MADISON, NEW YORK
From 26-APR-11 15:16:00 to 26-APR-11 15:16:00 (EST-5)
Location: CANASTOTA
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in ONEIDA, NEW YORK
From 26-APR-11 15:17:00 to 26-APR-11 15:17:00 (EST-5)
Location: SYLVAN BEACH
Magnitude: 1.75 
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Trees and wires were also blown down.

Thunderstorm Wind in ONEIDA, NEW YORK
From 26-APR-11 15:27:00 to 26-APR-11 15:27:00 (EST-5)
Location: ROME
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in ONEIDA, NEW YORK
From 26-APR-11 15:29:00 to 26-APR-11 15:29:00 (EST-5)
Location: LEE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm Wind in ONEIDA, NEW YORK
From 26-APR-11 15:30:00 to 26-APR-11 15:30:00 (EST-5)
Location: ROME
Magnitude: 50.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Dumpsters were overturned.

Hail in ONONDAGA, NEW YORK
From 26-APR-11 15:45:00 to 26-APR-11 15:45:00 (EST-5)
Location: MARCELLUS
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in ONONDAGA, NEW YORK
From 26-APR-11 15:45:00 to 26-APR-11 15:45:00 (EST-5)
Location: CAMILLUS
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in ONONDAGA, NEW YORK
From 26-APR-11 14:35:00 to 26-APR-11 14:35:00 (EST-5)
Location: LIVERPOOL
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in ONONDAGA, NEW YORK
From 26-APR-11 14:42:00 to 26-APR-11 14:42:00 (EST-5)
Location: LEWISTON MANOR
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in ONONDAGA, NEW YORK
From 26-APR-11 14:45:00 to 26-APR-11 14:45:00 (EST-5)
Location: EAST SYRACUSE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in ONEIDA, NEW YORK
From 26-APR-11 15:21:00 to 26-APR-11 15:21:00 (EST-5)
Location: VERONA
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in ONEIDA, NEW YORK
From 26-APR-11 15:25:00 to 26-APR-11 15:25:00 (EST-5)
Location: BLOSSVALE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in ONONDAGA, NEW YORK
From 26-APR-11 14:49:00 to 26-APR-11 14:49:00 (EST-5)
Location: KIRKVILLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in SCHUYLER, NEW YORK
From 26-APR-11 14:55:00 to 26-APR-11 14:55:00 (EST-5)
Location: READING CENTER
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in ONONDAGA, NEW YORK
From 26-APR-11 15:58:00 to 26-APR-11 15:58:00 (EST-5)
Location: LIVERPOOL
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in ONONDAGA, NEW YORK
From 26-APR-11 16:00:00 to 26-APR-11 16:00:00 (EST-5)
Location: LIVERPOOL
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in ONONDAGA, NEW YORK
From 26-APR-11 16:00:00 to 26-APR-11 16:00:00 (EST-5)
Location: SOLVAY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in ONONDAGA, NEW YORK
From 26-APR-11 16:00:00 to 26-APR-11 16:00:00 (EST-5)
Location: LEWISTON MANOR
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trees were blown down.

Hail in OTSEGO, NEW YORK
From 26-APR-11 21:00:00 to 26-APR-11 21:00:00 (EST-5)
Location: MARYLAND
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in MADISON, NEW YORK
From 26-APR-11 15:02:00 to 26-APR-11 15:02:00 (EST-5)
Location: SULLIVAN
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in MADISON, NEW YORK
From 26-APR-11 15:12:00 to 26-APR-11 15:12:00 (EST-5)
Location: SOUTH BAY
Magnitude: 60.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Near Oneida Lake, a roof was blown off and landed one mile away. Also, 3-4 foot diameter trees were snapped.

Thunderstorm Wind in ONONDAGA, NEW YORK
From 26-APR-11 15:18:00 to 26-APR-11 15:18:00 (EST-5)
Location: SHEPPS CORNERS
Magnitude: 60.00 EG
Property damage: 8.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A roof was blown off a home.

Tornado in ONEIDA, NEW YORK
From 26-APR-11 15:20:00 to 26-APR-11 15:23:00 (EST-5)
Location: VERONA MILLS
Tornado F-scale: EF1
Property damage: 5.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A brief touchdown of an EF-1 tornado occurred in a wooded area near the intersection of State Road 49 and Lauther Road near Verona Mills. Damage included multiple trees down and a snapped power pole.

Hail in ONONDAGA, NEW YORK
From 26-APR-11 14:30:00 to 26-APR-11 14:30:00 (EST-5)
Location: LEWISTON MANOR
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Flash Flood in ONEIDA, NEW YORK
From 26-APR-11 15:30:00 to 26-APR-11 20:30:00 (EST-5)
Location: ROME
Flood cause: Heavy Rain
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Roads were closed in Rome.

Flash Flood in ONONDAGA, NEW YORK
From 26-APR-11 16:00:00 to 26-APR-11 21:00:00 (EST-5)
Location: BALDWINSVILLE
Flood cause: Heavy Rain
Property damage: 9.00M
Crop damage: 0.00K
Reported by: Emergency Manager

The county reported permanent damage to over 250 roads in the county, with most of the damage centered on the Syracuse area. Several roads were totally washed out, and the City of Syracuse described the urban flash flooding as major.  Most roads in the county experienced degrees of flooding from ponding to major flooding and roadway breakdown. Standing water remained and closed several road intersections for several days afterward.

Flash Flood in CHEMUNG, NEW YORK
From 25-APR-11 22:00:00 to 26-APR-11 03:00:00 (EST-5)
Location: BIG FLATS
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Route 352 was washed out due to flash flooding.

Tornado in OTSEGO, NEW YORK
From 26-APR-11 20:35:00 to 26-APR-11 20:45:00 (EST-5)
Location: GILBERTSVILLE
Tornado F-scale: EF1
Property damage: 100.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A tornado touched down in woods near Route 51 between Mount Upton and Gilbertsville, producing EF0 damage until reaching Copes Corners Road where it strengthened to EF1, snapping and uprooting trees through a heavily wooded area. It moved up the hill and across the athletic fields of the Gilbertsville-Mount Upton Central School.  Here, it threw metal bleachers several hundred yards to the north. It also tore a press box off steel beams, hurled a railroad tie used in a parking lot over a hundred feet into a fence, broke off metal poles used for hanging netting, and bent a soccer goal back in the southward direction.  The field was littered with small tree missiles pointing in both directions with a southward direction on the left side of the path.  A portable toilet was lifted and dropped about a half mile away and some other light material was found almost a mile away. The tornado continued to the northeast passing south of Gilbertsville, with damage primarily to trees.  The path continued to narrow and weaken, ending a couple miles east of Gilbertsville.

Flash Flood in OTSEGO, NEW YORK
From 26-APR-11 22:30:00 to 27-APR-11 01:15:00 (EST-5)
Location: GILBERTSVILLE
Flood cause: Heavy Rain
Property damage: 1.00M
Crop damage: 0.00K
Reported by: County Official

Scattered roads were washed out and floods were reported throughout the county.

Thunderstorm Wind in YATES, NEW YORK
From 26-APR-11 12:55:00 to 26-APR-11 12:55:00 (EST-5)
Location: RUSHVILLE
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds took down trees and power lines in the Rushville area.

Thunderstorm Wind in CAYUGA, NEW YORK
From 26-APR-11 13:30:00 to 26-APR-11 13:30:00 (EST-5)
Location: FOSTERVILLE
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Newspaper

Thunderstorm winds caused power outages in the Aurelius area.

Thunderstorm Wind in ONONDAGA, NEW YORK
From 26-APR-11 13:50:00 to 26-APR-11 13:50:00 (EST-5)
Location: ELBRIDGE
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Newspaper

Thunderstorm winds caused power outages in the Elbridge area.

Thunderstorm Wind in ONONDAGA, NEW YORK
From 26-APR-11 14:21:00 to 26-APR-11 14:21:00 (EST-5)
Location: MARCELLUS
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Numerous trees were blown down.

Hail in ONONDAGA, NEW YORK
From 26-APR-11 16:00:00 to 26-APR-11 16:00:00 (EST-5)
Location: NORTH SYRACUSE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Other Federal Agency

Hail in ONONDAGA, NEW YORK
From 26-APR-11 14:42:00 to 26-APR-11 14:42:00 (EST-5)
Location: LIVERPOOL
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public