Category: Severe Weather

Analysis of 3/30 Tulsa Tornado Environment

A tornado affected the north and northeast suburbs of Tulsa, Oklahoma early yesterday evening. Despite the conditions in place, a Tornado Watch was not in effect, as instead, a Severe Thunderstorm Watch had been...

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Supercell Composite Parameter

Multiple variables are important to consider when it comes to supercell thunderstorm development. The Supercell Composite Parameter (SCP) was created to factor three important ingredients to determine how favorable an environment is to produce supercells. SCP...

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Severe Watches Lacking in 2015

For the fourth year in a row, overall severe thunderstorm activity, including tornadoes, finished below average across the Lower 48. This graphic shows the severe thunderstorm watch departure from the 13-year average. The vast...

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Supercells in Massachusetts

Multiple supercell thunderstorms moved through central and eastern Massachusetts this afternoon. Some of the storms prompted tornado warnings and there were multiple significant severe weather reports as a result. Some of the thunderstorms originated...

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Violent Tornadoes: 1962-2011

Over a 50-year span from 1962 to 2011, the most violent (F/EF-4 and F/EF-5) tornadoes occurred over Oklahoma and Mississippi. The maximum grid-points reported 16 over that period, with two of those grid-points in...

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U.S. Tornado Days Per Year

The United States has a greater frequency of tornadoes than most other counties. For many factors, the vast majority of tornadoes occur east of the Rocky Mountains across the continental U.S. Although the central...

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Tornado Strikes Worcester, Mass.

A high-end EF-0 tornado hit Worcester, Mass. early last night. The National Weather Service (NWS) out of Taunton, Mass. estimated that the tornado was on the ground from about 8:10 to 8:14 p.m. local...

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Evaluating a Tornado Index

I’ve been working on a tornado index over the past few years and it’s really basic. It evaluates instability (MLCAPE), wind shear and the potential for upward cyclonic rotation (helicity) and gives an index...

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