A line of thunderstorms moved into Western Massachusetts during the late afternoon and evening of the 31st.  There were numerous reports of hail, some of it an inch in diameter or larger.

Hail in FRANKLIN, MASSACHUSETTS
From 31-MAY-17 17:20:00 to 31-MAY-17 17:20:00 (EST-5)
Location: CONWAY
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

At 520 PM EST, Pea to Dime size hail fell at Conway.

Hail in HAMPSHIRE, MASSACHUSETTS
From 31-MAY-17 17:37:00 to 31-MAY-17 17:37:00 (EST-5)
Location: WILLIAMSBURG
Magnitude: 0.80 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

At 537 PM EST, hail in Williamsburg was reported as being between Dime size and Nickel size.

Hail in FRANKLIN, MASSACHUSETTS
From 31-MAY-17 17:53:00 to 31-MAY-17 17:53:00 (EST-5)
Location: LEVERETT
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

At 553 PM EST, Hail was reported in Leverett up to Nickel Size.

Hail in HAMPSHIRE, MASSACHUSETTS
From 31-MAY-17 18:07:00 to 31-MAY-17 18:07:00 (EST-5)
Location: FLORENCE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

At 607 PM EST, Hail at Florence was up to Nickel size.

Hail in HAMPSHIRE, MASSACHUSETTS
From 31-MAY-17 18:16:00 to 31-MAY-17 18:16:00 (EST-5)
Location: SOUTH HADLEY FALLS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

At 616 PM EST, Hail up to Quarter size was reported on Marcel Street in South Hadley.

Hail in HAMPDEN, MASSACHUSETTS
From 31-MAY-17 18:39:00 to 31-MAY-17 18:39:00 (EST-5)
Location: WESTFIELD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

At 639 PM EST, Hail up to 1 inch diameter was reported in Westfield.

Hail in HAMPDEN, MASSACHUSETTS
From 31-MAY-17 18:49:00 to 31-MAY-17 18:49:00 (EST-5)
Location: (BAF)BARNES ARPT WST
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

At 649 PM EST, Hail up to 1 inch in diameter was reported on East Mountain Road in Westfield.

Thunderstorm Wind in FRANKLIN, MASSACHUSETTS
From 31-MAY-17 17:30:00 to 31-MAY-17 17:30:00 (EST-5)
Location: DEERFIELD MOHAWK ARP
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Amateur Radio

At 530 PM EST, multiple trees were reported down on wires on River Road in Deerfield.

Thunderstorm Wind in HAMPSHIRE, MASSACHUSETTS
From 31-MAY-17 17:15:00 to 31-MAY-17 17:15:00 (EST-5)
Location: PLAINFIELD
Magnitude: 50.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

At 515 PM EST, strong winds were reported that blew down multiple large trees and damaged the roof of a building on Prospect Street in Plainfield.

Hail in HAMPSHIRE, MASSACHUSETTS
From 31-MAY-17 17:02:00 to 31-MAY-17 17:02:00 (EST-5)
Location: PLAINFIELD
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

At 502 PM EST, dime size hail covered the ground in Plainfield.

Hail in FRANKLIN, MASSACHUSETTS
From 31-MAY-17 16:57:00 to 31-MAY-17 16:59:00 (EST-5)
Location: ROWE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Dime size hail began in Rowe at 457 PM EST and increased to nickel size at 459 PM EST.

Hail in HAMPSHIRE, MASSACHUSETTS
From 31-MAY-17 17:05:00 to 31-MAY-17 17:05:00 (EST-5)
Location: HADLEY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

At 505 PM EST, quarter size hail fell at East Hadley.

Hail in HAMPSHIRE, MASSACHUSETTS
From 31-MAY-17 17:43:00 to 31-MAY-17 17:43:00 (EST-5)
Location: WILLIAMSBURG
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

At 543 PM EST, quarter size hail was reported in Williamsburg.

Hail in HAMPSHIRE, MASSACHUSETTS
From 31-MAY-17 17:45:00 to 31-MAY-17 17:45:00 (EST-5)
Location: BAY STATE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

At 545 PM EST, dime size hail was reported in Northampton.

Hail in HAMPSHIRE, MASSACHUSETTS
From 31-MAY-17 17:54:00 to 31-MAY-17 17:54:00 (EST-5)
Location: BAY STATE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

At 554 PM EST, nickel size hail was reported in Northampton.

Hail in HAMPSHIRE, MASSACHUSETTS
From 31-MAY-17 17:54:00 to 31-MAY-17 17:54:00 (EST-5)
Location: EASTHAMPTON
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

At 554 PM EST, nickel size hail was reported in Easthampton.

Hail in HAMPDEN, MASSACHUSETTS
From 31-MAY-17 18:00:00 to 31-MAY-17 18:00:00 (EST-5)
Location: MONTGOMERY
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

At 6 PM EST, dime size hail was reported to be covering the ground in Montgomery.

Hail in HAMPSHIRE, MASSACHUSETTS
From 31-MAY-17 18:11:00 to 31-MAY-17 18:11:00 (EST-5)
Location: GRANBY
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

At 611 PM EST, dime size hail was reported at Granby.

Hail in HAMPDEN, MASSACHUSETTS
From 31-MAY-17 18:22:00 to 31-MAY-17 18:22:00 (EST-5)
Location: GRANVILLE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

At 622 PM EST, dime size hail was reported in Granville.

Hail in HAMPSHIRE, MASSACHUSETTS
From 31-MAY-17 18:30:00 to 31-MAY-17 18:30:00 (EST-5)
Location: BELCHERTOWN
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

At 630 PM EST, dime size hail was reported in Belchertown.

Hail in HAMPDEN, MASSACHUSETTS
From 31-MAY-17 18:35:00 to 31-MAY-17 18:35:00 (EST-5)
Location: WESTFIELD
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

At 635 PM EST, hail up to nickel size was reported in Westfield, per the media.

Hail in HAMPDEN, MASSACHUSETTS
From 31-MAY-17 18:39:00 to 31-MAY-17 18:39:00 (EST-5)
Location: SOUTHWICK
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

At 639 PM EST, nickel size hail was reported in Southwick.

Hail in HAMPDEN, MASSACHUSETTS
From 31-MAY-17 18:42:00 to 31-MAY-17 18:42:00 (EST-5)
Location: WILLIMANSETT
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

At 642 PM EST, dime size hail was reported in Chicopee.

Hail in HAMPDEN, MASSACHUSETTS
From 31-MAY-17 18:45:00 to 31-MAY-17 18:45:00 (EST-5)
Location: WESTFIELD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

At 645 PM EST, quarter size hail covering the ground was reported in Westfield.

Hail in HAMPDEN, MASSACHUSETTS
From 31-MAY-17 18:46:00 to 31-MAY-17 18:46:00 (EST-5)
Location: WESTFIELD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

At 646 PM EST, quarter size hail was reported on Folly Drive in Westfield.

Hail in HAMPDEN, MASSACHUSETTS
From 31-MAY-17 18:47:00 to 31-MAY-17 18:47:00 (EST-5)
Location: WESTFIELD
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

At 647 PM EST, the media reported half dollar size hail falling near Provin Mountain in Westfield.

Hail in HAMPDEN, MASSACHUSETTS
From 31-MAY-17 18:56:00 to 31-MAY-17 18:56:00 (EST-5)
Location: AGAWAM
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

At 656 PM EST, nickel size hail was reported in Agawam.

Hail in HAMPDEN, MASSACHUSETTS
From 31-MAY-17 19:00:00 to 31-MAY-17 19:00:00 (EST-5)
Location: WEST SPRINGFIELD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

At 7 PM EST, quarter size hail was reported in West Springfield.

Hail in HAMPDEN, MASSACHUSETTS
From 31-MAY-17 19:43:00 to 31-MAY-17 19:43:00 (EST-5)
Location: WESTFIELD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

At 743 PM EST, quarter size hail was reported in Westfield.

Hail in HAMPDEN, MASSACHUSETTS
From 31-MAY-17 19:00:00 to 31-MAY-17 19:00:00 (EST-5)
Location: AGAWAM
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

At 7 PM EST, quarter size hail was reported in Agawam.

Hail in HAMPDEN, MASSACHUSETTS
From 31-MAY-17 17:10:00 to 31-MAY-17 17:10:00 (EST-5)
Location: EAST SPRINGFIELD
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

At 510 PM EST, nickel size hail fell in Springfield.