On July 21st, a developing surface low across the Great Lakes traveled along a stationary boundary draped across the North Country. Surface conditions became increasingly unstable during the afternoon with temperatures in the 80s and dewpoints in the 60s and lower 70s. More importantly, an unseasonably strong mid-atmospheric shortwave and winds aloft tracked across this region as well, which allowed for thunderstorms to develop rapidly, intensify and maintain longevity.
During the afternoon and evening, scattered to numerous thunderstorms developed traveled across northern New York and through Vermont. Several storms strengthened into supercells that produced widespread wind damage to trees, power poles and structures as well as large hail in excess of golf ball size in diameter.
Some of the communities largely affected were Milton, Colchester, Essex, Jericho, Stowe, Brookfield, Chelsea and Rutland. In addition, very heavy localized rains caused some temporary problems in many communities, but did result in washed out roads, culverts in Chelsea.

Thunderstorm Wind in RUTLAND, VERMONT
From 21-JUL-10 18:35:00 to 21-JUL-10 18:35:00 (EST-5)
Location: FAIR HAVEN
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Public

Trees down by thunderstorm winds.

Thunderstorm Wind in RUTLAND, VERMONT
From 21-JUL-10 18:45:00 to 21-JUL-10 18:50:00 (EST-5)
Location: RUTLAND
Magnitude: 55.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Public

Trees and power lines down across Rutland, including Rutland Country Club.

Hail in CHITTENDEN, VERMONT
From 21-JUL-10 14:10:00 to 21-JUL-10 14:10:00 (EST-5)
Location: ESSEX CENTER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 50.00K
Reported by: Public

Nickel to quarter size hail reported in Essex Center toward Chapin Orchards. Moderate damage to apple and other crops.

Hail in CHITTENDEN, VERMONT
From 21-JUL-10 14:20:00 to 21-JUL-10 14:20:00 (EST-5)
Location: UNDERHILL FLATS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Nickel to quarter size hail reported.

Thunderstorm Wind in CHITTENDEN, VERMONT
From 21-JUL-10 14:05:00 to 21-JUL-10 14:05:00 (EST-5)
Location: ESSEX CENTER
Magnitude: 55.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Public

Several reports of down trees and branches throughout Essex Center, including some of these roads...Sandhill, Route 15, Old Stage and Chelsea.

Thunderstorm Wind in CHITTENDEN, VERMONT
From 21-JUL-10 14:10:00 to 21-JUL-10 14:10:00 (EST-5)
Location: JERICHO CENTER
Magnitude: 60.00 EG
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Public

Several large trees on houses in Jericho Center, as well as numerous reports of trees and power lines as well as other structural damage throughout Jericho.

Hail in CHITTENDEN, VERMONT
From 21-JUL-10 14:05:00 to 21-JUL-10 14:05:00 (EST-5)
Location: COLCHESTER
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Dime size hail reported in Colchester Village.

Hail in WINDSOR, VERMONT
From 21-JUL-10 18:25:00 to 21-JUL-10 18:25:00 (EST-5)
Location: TAFTSVILLE
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Dime, quarter and up to half-dollar size hail reported.

Hail in WINDSOR, VERMONT
From 21-JUL-10 18:25:00 to 21-JUL-10 18:25:00 (EST-5)
Location: WOODSTOCK
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Dime size hail reported.

Hail in ADDISON, VERMONT
From 21-JUL-10 14:15:00 to 21-JUL-10 14:15:00 (EST-5)
Location: LINCOLN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Quarter size hail reported in Lincoln.

Thunderstorm Wind in CHITTENDEN, VERMONT
From 21-JUL-10 14:10:00 to 21-JUL-10 14:10:00 (EST-5)
Location: JERICHO CENTER
Magnitude: 60.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Public

Several large trees on houses in Jericho Center.

Hail in CHITTENDEN, VERMONT
From 21-JUL-10 13:55:00 to 21-JUL-10 13:55:00 (EST-5)
Location: MILTON
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 20.00K
Reported by: Public

Half-dollar size hail reported in several locations across Milton. Some minor crop damage to corn and other vegetable crops.

Thunderstorm Wind in CHITTENDEN, VERMONT
From 21-JUL-10 13:55:00 to 21-JUL-10 14:00:00 (EST-5)
Location: COLCHESTER
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Public

Several large branches/limbs downed by thunderstorm winds near the intersection of Routes 7 and 127. Additional reports of downed trees, branches and limbs across Colchester Village and along Route 7 to Chimney Corners.

Hail in CHITTENDEN, VERMONT
From 21-JUL-10 14:00:00 to 21-JUL-10 14:00:00 (EST-5)
Location: COLCHESTER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 25.00K
Reported by: Public

Nickel to quarter size hail reported from Chimney Corners along Route 7 into Colchester Village. Some local crop damage.

Thunderstorm Wind in CHITTENDEN, VERMONT
From 21-JUL-10 13:55:00 to 21-JUL-10 14:00:00 (EST-5)
Location: COLCHESTER
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Public

Several large branches/limbs downed by thunderstorm winds near the intersection of Routes 7 and 127. Additional scattered branches along Route 7.

Thunderstorm Wind in CHITTENDEN, VERMONT
From 21-JUL-10 14:05:00 to 21-JUL-10 14:10:00 (EST-5)
Location: ESSEX CENTER
Magnitude: 60.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Public

Numerous trees, large branches and power lines down across Essex due to thunderstorm winds, including Chelsea, Sandhill, Old Stage roads.

Hail in LAMOILLE, VERMONT
From 21-JUL-10 14:40:00 to 21-JUL-10 14:40:00 (EST-5)
Location: STOWE
Magnitude: 1.00 
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Nickel to quarter size hail reported along Route 100 between Stowe Village and Morrisville. Wind damage reported as well.

Hail in ORANGE, VERMONT
From 21-JUL-10 14:55:00 to 21-JUL-10 14:55:00 (EST-5)
Location: WEST BROOKFIELD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 20.00K
Reported by: Public

Nickel to quarter size hail caused damage to corn and other crops nearing harvest.

Hail in GRAND ISLE, VERMONT
From 21-JUL-10 13:40:00 to 21-JUL-10 13:40:00 (EST-5)
Location: SOUTH HERO
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 25.00K
Reported by: Public

Several reports of quarter size diameter hail across South Hero, including South Street where some damage to apple orchards and other crops.

Thunderstorm Wind in LAMOILLE, VERMONT
From 21-JUL-10 14:40:00 to 21-JUL-10 14:45:00 (EST-5)
Location: STOWE
Magnitude: 55.00 EG
Property damage: 75.00K
Crop damage: 10.00K
Reported by: Fire Department/Rescue

Numerous reports of trees, large branches and power lines down along Route 100 between Stowe Village and Morrisville, including adjacent roads such as Stage Coach. Some slight structural damage to homes, barns, as well as to corn fields and other crops.

Thunderstorm Wind in CALEDONIA, VERMONT
From 21-JUL-10 15:00:00 to 21-JUL-10 15:00:00 (EST-5)
Location: HARDWICK
Magnitude: 50.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A few trees and large branches down across Hardwick, including Mackville road.

Hail in WINDSOR, VERMONT
From 21-JUL-10 18:30:00 to 21-JUL-10 18:30:00 (EST-5)
Location: HARTLAND
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Quarter size hail reported.

Hail in RUTLAND, VERMONT
From 21-JUL-10 18:40:00 to 21-JUL-10 18:40:00 (EST-5)
Location: PROCTOR
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Dime to penny size hail reported.

Hail in WASHINGTON, VERMONT
From 21-JUL-10 14:40:00 to 21-JUL-10 14:40:00 (EST-5)
Location: WARREN
Magnitude: 1.75 
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Public

Half dollar to golf ball size hail reported within Sugarbush Village.

Hail in WASHINGTON, VERMONT
From 21-JUL-10 15:30:00 to 21-JUL-10 15:30:00 (EST-5)
Location: IRASVILLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Half to one inch diameter hail reported.

Hail in ADDISON, VERMONT
From 21-JUL-10 15:15:00 to 21-JUL-10 15:15:00 (EST-5)
Location: BRISTOL ARPT
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Nickel size hail and trees reported down along Monkton road.

Thunderstorm Wind in RUTLAND, VERMONT
From 21-JUL-10 18:50:00 to 21-JUL-10 18:50:00 (EST-5)
Location: NORTH CLARENDON
Magnitude: 50.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Public

Tree fallen and damaged a mobile home.

Hail in WASHINGTON, VERMONT
From 21-JUL-10 15:25:00 to 21-JUL-10 15:25:00 (EST-5)
Location: WARREN
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Nickel size hail reported.

Thunderstorm Wind in ORANGE, VERMONT
From 21-JUL-10 15:35:00 to 21-JUL-10 15:40:00 (EST-5)
Location: WEST CORINTH
Magnitude: 65.00 EG
Property damage: 50.00K
Crop damage: 50.00K
Reported by: COOP Observer

Numerous reports of trees down throughout Corinth, including small microburst of hundreds of trees uprooted or snapped in Coop Observer backyard.

Hail in ADDISON, VERMONT
From 21-JUL-10 15:15:00 to 21-JUL-10 15:15:00 (EST-5)
Location: SOUTH STARKSBORO
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Half dollar size hail reported.

Hail in CALEDONIA, VERMONT
From 21-JUL-10 15:25:00 to 21-JUL-10 15:25:00 (EST-5)
Location: DANVILLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 10.00K
Reported by: Public

Quarter size hail reported in Danville. Slight damage to corn and other crops.

Thunderstorm Wind in ORANGE, VERMONT
From 21-JUL-10 15:45:00 to 21-JUL-10 15:45:00 (EST-5)
Location: FAIRLEE
Magnitude: 60.00 EG
Property damage: 75.00K
Crop damage: 25.00K
Reported by: Emergency Manager

Thunderstorm winds damaged a farm along Route 5, including flattening one barn and severely damaging others.

Hail in WASHINGTON, VERMONT
From 21-JUL-10 16:00:00 to 21-JUL-10 16:00:00 (EST-5)
Location: NORTHFIELD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Quarter size hail reported.

Hail in ORANGE, VERMONT
From 21-JUL-10 16:10:00 to 21-JUL-10 16:10:00 (EST-5)
Location: BROOKFIELD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Light accumulation of nickle to quarter size hail from second storm within an hour.

Thunderstorm Wind in ADDISON, VERMONT
From 21-JUL-10 14:15:00 to 21-JUL-10 14:15:00 (EST-5)
Location: LINCOLN
Magnitude: 50.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees and limbs down across Lincoln.

Thunderstorm Wind in ORANGE, VERMONT
From 21-JUL-10 15:35:00 to 21-JUL-10 15:40:00 (EST-5)
Location: STRAFFORD
Magnitude: 55.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Numerous trees down between Strafford and Vershire along Route 113 and numerous backroads.

Hail in ORANGE, VERMONT
From 21-JUL-10 16:15:00 to 21-JUL-10 16:15:00 (EST-5)
Location: BRAINTREE HILL
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Quarter size hail reported.

Hail in ORANGE, VERMONT
From 21-JUL-10 15:55:00 to 21-JUL-10 15:55:00 (EST-5)
Location: BRADFORD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 20.00K
Reported by: Amateur Radio

Nickel to quarter size hail reported across Bradford.

Hail in ADDISON, VERMONT
From 21-JUL-10 15:10:00 to 21-JUL-10 15:10:00 (EST-5)
Location: BRISTOL
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Half dollar size hail reported near Bristol pond.

Thunderstorm Wind in ORANGE, VERMONT
From 21-JUL-10 15:15:00 to 21-JUL-10 15:20:00 (EST-5)
Location: CHELSEA
Magnitude: 55.00 EG
Property damage: 75.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Scattered tree damage throughout Chelsea Village with a metal sheeting roof removed from house on the corner of Route 110 and Upper Village/Corinth road.

Hail in ORANGE, VERMONT
From 21-JUL-10 15:05:00 to 21-JUL-10 15:05:00 (EST-5)
Location: EAST BROOKFIELD
Magnitude: 2.00 
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Public

Larger than golf ball size hail reported as well as hundreds of downed trees and power lines along East Hill and Chelsea roads.

Thunderstorm Wind in ORANGE, VERMONT
From 21-JUL-10 15:40:00 to 21-JUL-10 15:40:00 (EST-5)
Location: BRADFORD
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Public

Several trees down by thunderstorm winds.

Thunderstorm Wind in ADDISON, VERMONT
From 21-JUL-10 15:50:00 to 21-JUL-10 15:50:00 (EST-5)
Location: BREAD LOAF
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trees and power lines down along and near Goshen and Ripton roads.

Thunderstorm Wind in ORANGE, VERMONT
From 21-JUL-10 15:30:00 to 21-JUL-10 15:30:00 (EST-5)
Location: VERSHIRE
Magnitude: 50.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Scattered trees down in Vershire and along Route 113 toward Chelsea and Fairlee.

Flash Flood in ORANGE, VERMONT
From 21-JUL-10 16:40:00 to 21-JUL-10 18:00:00 (EST-5)
Location: CHELSEA
Flood cause: Heavy Rain
Property damage: 100.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

The second in a series of severe thunderstorms with torrential rains washed out several culverts, lower portions of Kennedy Drive and partial shoulder washouts along Upper Village road.

Thunderstorm Wind in ORANGE, VERMONT
From 21-JUL-10 15:10:00 to 21-JUL-10 15:15:00 (EST-5)
Location: EAST BROOKFIELD
Magnitude: 60.00 EG
Property damage: 150.00K
Crop damage: 25.00K
Reported by: NWS Storm Survey

Scattered, but numerous tree damage in the form of uprooted and snapped trees including 50-75 foot Maples across western Chelsea along Brook, Williamstown and Bobbinshop roads. Some structural damage to a few houses and destroyed newly constructed sugar house and damaged sugaring equipment.

Thunderstorm Wind in ORANGE, VERMONT
From 21-JUL-10 15:05:00 to 21-JUL-10 15:10:00 (EST-5)
Location: EAST BROOKFIELD
Magnitude: 75.00 EG
Property damage: 350.00K
Crop damage: 100.00K
Reported by: NWS Storm Survey

Hundreds of 40-50 foot pines, large mature maples and other trees snapped or uprooted in a northwest to southeast direction along East Hill and Chelsea roads along the Brookfield/Chelsea town line centered off Woods road. More than two dozen utility poles down as well as structural damage to several homes. Microburst and straight-line wind damage with winds estimated 80 to 90 mph was determined by NWS survey.

Hail in ORANGE, VERMONT
From 21-JUL-10 15:35:00 to 21-JUL-10 15:35:00 (EST-5)
Location: CORINTH
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Quarter size hail as well as hundreds of trees downed by thunderstorm winds.