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F1 tornado in Norfolk County, Massachusetts

Tornado August 21, 2004 · Norfolk County, Massachusetts

F1
Rating
6.0 mi
Path length
40 yd
Path width
$1.5M
Damage as recorded
EF0EF1EF2EF3EF4EF5Unrated

The path drawn at its surveyed width of 40 yards (0.02 mi) — zoom in and the swath grows to true scale. Other tornadoes recorded nearby that day are shown faint.

What F1 means. This tornado was rated on Fujita’s original scale, used until 2007. F1 meant moderate damage: roofs badly stripped, mobile homes pushed off foundations or overturned, windows broken; the scale paired it with winds of 73–112 mph, figures later judged too high, especially toward the top of the scale, and revised downward in the Enhanced Fujita scale. Ratings then, as now, came from the damage.

What the National Weather Service wrote

F1 tornado

The wider storm

An early morning severe thunderstorm in Leominster downed large tree limbs.Thunderstorms developed again that afternoon and caused damage in parts of eastern Massachusetts. One storm spawned a weak tornado that took a long and narrow, but very discrete path across western Norfolk County, according to a National Weather Service storm survey. The tornado touched down near Farm Hill Road in West Wrentham near the Rhode Island border. It traveled on the ground for 6 miles to the northeast, passing over southeasternmost Franklin, Interstate 495, Lake Pearl, the northern part of Lake Archer, and ending up near the Wrentham State School, which is near the border with the town of Norfolk. The tornado damage was classified as F1 at two locations: on Summer Street in Franklin and in a subdivision between Lake Pearl and Lake Archer. Wind speeds were estimated at 90 mph in these areas. Tall oak and pine trees were snapped and uprooted at their bases. Many large trees landed on houses throughout Wrentham causing additional damage. The remainder of the tornado's track was considered as F0 with estimated wind speeds of 70 mph. The path width ranged from as narrow as 40 feet to as wide as 120 feet, or 40 yards. One eyewitness near the initial touchdown site saw trees swirling around in mid-air from the front window of her home and heard an unusual roaring sound. No injuries were reported.The same thunderstorm which spawned the tornado weakened as it moved across central and eastern Norfolk County, but downed several trees from Foxborough to Walpole, Sharon and Dedham. It also downed large branches in Watertown, South Boston, and Hingham.In Townsend, three golfers were struck by lightning at a country club.

Began near Franklin (42.0833, -71.4000).

Source: NOAA Storm Events Database, event 5421441. Narratives are written by the National Weather Service forecast office that issued the report.

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