A cold front over the Great Lakes moved through Southern New England during the late afternoon and early night of May 15th.  The air mass over Connecticut was very warm and humid, and as the cold front moved into this air it generated numerous thunderstorms. Some thunderstorms produced damaging wind gusts, large hail, and heavy downpours.

Thunderstorm Wind in TOLLAND, CONNECTICUT
From 15-MAY-18 15:40:00 to 15-MAY-18 15:40:00 (EST-5)
Location: SOMERS
Magnitude: 48.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Amateur Radio

At 3:40 PM EST trees and wires were reported down on Springfield Road at Turnpike Road in Somers.

Thunderstorm Wind in TOLLAND, CONNECTICUT
From 15-MAY-18 15:45:00 to 15-MAY-18 15:45:00 (EST-5)
Location: UNION
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Amateur Radio

At 3:45 PM EST, a tree and wires were down on Buckley Highway in Union.

Thunderstorm Wind in HARTFORD, CONNECTICUT
From 15-MAY-18 15:45:00 to 15-MAY-18 15:45:00 (EST-5)
Location: NORTH CANTON
Magnitude: 48.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Amateur Radio

At 3:45 PM EST numerous trees were reported down on Old Farms Road near Tollgale Lane, Holcomb Street at Cardinal Road, and Barndoor Hills Road at Firetown Road.  A single tree was down across Richard Road.

Thunderstorm Wind in TOLLAND, CONNECTICUT
From 15-MAY-18 16:35:00 to 15-MAY-18 16:35:00 (EST-5)
Location: STORRS
Magnitude: 40.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Amateur Radio

At 4:35 PM EST a tree and wires were down on Birchwood Heights Road in Mansfield.

Thunderstorm Wind in HARTFORD, CONNECTICUT
From 15-MAY-18 16:23:00 to 15-MAY-18 16:23:00 (EST-5)
Location: MARION
Magnitude: 46.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Amateur Radio

At 4:23 PM EST a tree was down on a house on Marion Avenue in Southington. A tree was down on Wilbur Street and Milldale Avenue in Southington.  A large tree was down on South End Road in the Plantsville section of Southington.

Thunderstorm Wind in TOLLAND, CONNECTICUT
From 15-MAY-18 16:30:00 to 15-MAY-18 16:30:00 (EST-5)
Location: AMSTON
Magnitude: 40.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Amateur Radio

At 4:30 PM EST, a tree and wires were reported down on Old Colchester Road in Bolton near the Colchester town line.

Thunderstorm Wind in HARTFORD, CONNECTICUT
From 15-MAY-18 15:45:00 to 15-MAY-18 15:45:00 (EST-5)
Location: NORTH BLOOMFIELD
Magnitude: 48.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Amateur Radio

At 3:45 PM EST trees were reported down on both Duncaster Road and Hopkins Road in Bloomfield.

Thunderstorm Wind in WINDHAM, CONNECTICUT
From 15-MAY-18 16:55:00 to 15-MAY-18 16:55:00 (EST-5)
Location: PLAINFIELD
Magnitude: 40.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Amateur Radio

At 4:55 PM EST trees were reported blocking Greene Avenue at the intersection with Butterworth Avenue in Plainfield.

Hail in HARTFORD, CONNECTICUT
From 15-MAY-18 15:00:00 to 15-MAY-18 16:00:00 (EST-5)
Location: GRANBY
Magnitude: 2.50 
Property damage: 70.00K
Crop damage: 0.00K
Reported by: Broadcast Media

At 3:15 PM EST, car windshields and house windows in Granby were smashed by tennis ball size hail.  Tennis ball size hail was also reported in East Hartland.

Thunderstorm Wind in WINDHAM, CONNECTICUT
From 15-MAY-18 16:35:00 to 15-MAY-18 16:35:00 (EST-5)
Location: ASHFORD
Magnitude: 50.00 EG
Property damage: 6.00K
Crop damage: 0.00K
Reported by: Amateur Radio

At 4:35 PM EST trees and wires were reported down on Snow lane at Kennerson Reservoir Road in Ashford.

Thunderstorm Wind in WINDHAM, CONNECTICUT
From 15-MAY-18 16:40:00 to 15-MAY-18 16:40:00 (EST-5)
Location: WOODSTOCK
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Amateur Radio

At 4:40 PM EST, siding was blown off the Woodstock Academy school building on Academy Road in Woodstock.

Thunderstorm Wind in WINDHAM, CONNECTICUT
From 15-MAY-18 16:45:00 to 15-MAY-18 16:45:00 (EST-5)
Location: ABINGTON
Magnitude: 60.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Amateur Radio

At 4:45 PM EST trees and wires were reported down on State Route 97 in Abington.

Thunderstorm Wind in WINDHAM, CONNECTICUT
From 15-MAY-18 16:45:00 to 15-MAY-18 16:45:00 (EST-5)
Location: KLONDIKE
Magnitude: 50.00 EG
Property damage: 8.00K
Crop damage: 0.00K
Reported by: Amateur Radio

At 4:45 PM EST, multiple trees were down in Putnam on Mechanics Street, Groveland Avenue, and at the intersection of U.S. Route 44 and State Route 21.

Thunderstorm Wind in WINDHAM, CONNECTICUT
From 15-MAY-18 16:40:00 to 15-MAY-18 16:45:00 (EST-5)
Location: PHOENIXVILLE
Magnitude: 70.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Amateur Radio

At 4:40 PM EST, trees were reported down on State Route 244 at the Route 97 intersection near Pomfret.  Trees were down at the Pomfret School at Pomfret Street and Paradise Road, at the junction of Paradise Road and Deerfield Road, and at the intersection of North Road and Hampton Road.  A tree was down across the road at U.S. Route 44 and Firetower Road.