The second severe weather event for the day occurred north of the Massachusetts Turnpike (Interstate 90). This severe weather was triggered by an approaching cold front from the west. The previously hard hit areas of Rhode Island and southeast Massachusetts were not affected by this second round of storms. As these storms developed across western Massachusetts, they began to produce wind gusts of 50 to 60 mph. As they continued to move eastward, unusually large hail was the main event as several locations, including Boston, had hail up to 2 inches in diameter! In fact, the 2 inch diameter hail that occurred in Boston is the largest to ever occur in Suffolk County since records began in 1950.

Marine Thunderstorm Wind in Massachusetts Bay And Ipswich Bay, ATLANTIC NORTH
From 04-AUG-15 14:20:00 to 04-AUG-15 14:20:00 (EST-5)
Location: MARBLEHEAD NECK
Magnitude: 43.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The Automated Surface Observing System at Beverly Municipal Airport recorded a wind gust of 49 mph.  No damage was reported.

Marine Thunderstorm Wind in Massachusetts Bay And Ipswich Bay, ATLANTIC NORTH
From 04-AUG-15 14:35:00 to 04-AUG-15 14:35:00 (EST-5)
Location: ROCKPORT
Magnitude: 47.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The WeatherFlow reporting site at Dog Bar Breakwater recorded a wind gust of 54 mph.  No damage was reported.

Waterspout in Boston Harbor, ATLANTIC NORTH
From 04-AUG-15 15:25:00 to 04-AUG-15 15:26:00 (EST-5)
Location: BOSTON LIGHT
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

A waterspout was seen off of Peddocks Island in Boston Harbor.  No damage was reported.

Marine Thunderstorm Wind in Boston Harbor, ATLANTIC NORTH
From 04-AUG-15 15:22:00 to 04-AUG-15 15:22:00 (EST-5)
Location: BOSTON LIGHT
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The WeatherFlow reporting site at Deer Island recorded a wind gust of 60 mph.  No damage was reported.

Marine Hail in Boston Harbor, ATLANTIC NORTH
From 04-AUG-15 15:25:00 to 04-AUG-15 15:25:00 (EST-5)
Location: BOSTON LIGHT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Quarter size hail fell over Boston Harbor.

Marine Thunderstorm Wind in Boston Harbor, ATLANTIC NORTH
From 04-AUG-15 15:30:00 to 04-AUG-15 15:30:00 (EST-5)
Location: BOSTON LIGHT
Magnitude: 47.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The WeatherFlow reporting site at Hull Yacht Club recorded a wind gust of 54 mph.  No damage was reported.

Marine Thunderstorm Wind in Massachusetts Bay And Ipswich Bay, ATLANTIC NORTH
From 04-AUG-15 15:41:00 to 04-AUG-15 15:41:00 (EST-5)
Location: MARBLEHEAD NECK
Magnitude: 36.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The WeatherFlow reporting site at Children's Island recorded a wind gust of 42 mph.  No damage was reported.

Marine Thunderstorm Wind in Boston Harbor, ATLANTIC NORTH
From 04-AUG-15 15:21:00 to 04-AUG-15 15:21:00 (EST-5)
Location: BOSTON LIGHT
Magnitude: 44.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The WeatherFlow reporting site at Pleasure Bay recorded a wind gust of 51 mph. No damage was reported.