mesocyclones

The dry line often but not always serves as the dynamical forcing to trigger thunderstorms in capped environments, which then sometimes go on to develop mesocyclones which sometimes produce tornadoes.

The Volokh Conspiracy » Pathogens in Harm’s Way: 2009

Richard had been collecting some research data to prive a-- prove a theory he had about electromagnetic fields in mesocyclones and tornado genesis.

CNN Transcript Oct 19, 2009 2009

Scientists speculate that mesocyclones form when strong horizontal upper air winds interact with normally occurring updrafts.

Thunderstorm 2008

In some cases, mesocyclones can overshoot the top of the storm and form a cloud dome (Figure 7).

Thunderstorm 2008

RE: #2 – So stable, in fact, that the count padders are scraping the bottom of the barrel, naming cut off lows, occluded fronts and mesocyclones.

Hurricanes 2007 « Climate Audit 2007

COOPER: That triggered super cell thunderstorms, sometimes spawning mesocyclones.

CNN Transcript May 7, 2007 2007

Fujita and Tepper called the miniature low-pressure systems mesocyclones, a counterclockwise swirl beneath powerful storms.

Storm Warning Nancy Mathis 2007

COOPER: That triggered supercell thunderstorms, sometimes spawning mesocyclones.

CNN Transcript May 7, 2007 2007

He began a painstaking two-year process that invented photogrammetry for tornado studies, detailed and named the cloud structure within the storm, and provided initial clues on the formation of tornadoes within mesocyclones.

Storm Warning Nancy Mathis 2007

Fujita, with his cartography skills, was able not only to explain but also to diagram the mesolows, mesohighs, and mesocyclones, the word meso indicating those weather systems up to 250 miles wide.

Storm Warning Nancy Mathis 2007