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2011 Springfield tornado

EF3 tornado in Massachusetts, U.S.

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Meteorological synopsis

On May 30, the Storm Prediction Center (SPC) noted the possibility of a severe weather event in the Northeastern United States in their outlook. A storm system was forecast to draw warm, moist air (with dew points over 60 °F (16 °C)) from the south, ahead of a driving cold front. In light of this, the SPC issued a slight risk for severe thunderstorms across the area. As an upper-level trough moved over the Great Lakes, further moisture and warmth increased atmospheric instability in the area, raising the threat of a squall line or supercell thunderstorms. By June 1, the storm system moved over Ontario and Quebec, with a cold front trailing behind it over northern New England. CAPE values exceeded 4,000 J/kg, indicating an extreme amount of instability in the atmosphere, conducive to strong thunderstorms. Additionally, a strong upper-level jet stream brought significant wind shear, which, in combination with the atmospheric instability, indicated a significant severe weather threat, with the main effects expected to result from downburst winds and large hail, but with tornadoes possible. An EML, which emerged over Arizona on May 28, was also present and created abnormally steep lapse rates in the mid-levels of the atmosphere, further increasing instability.

Between 8:18 a.m. and 9:15 a.m. (EDT), severe storms producing 1 in (2.5 cm) hail developed over portions of New Hampshire, Massachusetts and Maine; however, little if any impact resulted from these storms. At 10:05 a.m., the SPC issued a severe thunderstorm watch for the entire state of Vermont, much of northern New York, northeastern Pennsylvania and parts of western Massachusetts and Connecticut. By this time, a broken line of severe storms had developed over parts of western New York and northern Pennsylvania. With the storms gradually developing throughout the day and an increasing threat of tornadoes, a tornado watch was issued at 1:00 p.m. for much of New England, southern New York, eastern Pennsylvania and most of New Jersey. Around 2:00 p.m., severe storms with damaging hail, measured up to 2.75 in (7.0 cm), and winds around 60 mph (97 km/h) developed in eastern New York. These storms gradually tracked east-southeastward into Vermont and later New Hampshire. One particular supercell produced very large 3.25-inch (8.3 cm) diameter hail at Shaftsbury, Vermont after producing a funnel cloud and baseball sized hail across the border in New York State. At 2:43 p.m., the first of several tornado warnings in the area was issued for southern Coos County, New Hampshire.

Between 3:00 and 3:30 p.m., severe storms developed over western Massachusetts and prompted a tornado warning to be issued at 3:28 p.m. for parts of Hampden, Hampshire and Franklin Counties. About an hour later, another warning was issued for Springfield, Massachusetts, and surrounding areas. Within minutes, a touchdown was confirmed near Springfield by local law enforcement and amateur radio operators.

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