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Severe Thunderstorms roll through Southern Wisconsin!

Jun 15, 2010
Conditions are becoming favorable for some strong to possibly severe weather across the Badgerland on Friday June 18, 2010. Both the GFS and NAM models are predicting high instability across the region along with marginal wind shear to promote strong thunderstorms. A weak cold front will be slowly dragging across the state to help trigger thunderstorms. If morning convection can clear out early enough, the atmosphere will be primed for strong thunderstorms during the afternoon.

Another interesting note is the Storm Prediction Center "Supercell Composite" parameter value is maxed out at 12 across southwest Wisconsin. The "Significant Tornado" parameter value is at 4 which also bears watching. These values don't guarantee the end result, but gives a forecaster an idea what may happen combining various severe weather parameters. Stay Tuned!

NAM Model forecasting high instabilityGFS Model forecasting high instability.Supercell Composite ParameterSignificant Tornado Parameter

June 18, 2010 - Severe Weather


Severe Thunderstorms did erupt early in the afternoon across Iowa, Illinois and southern Wisconsin. These storms did produce some wind damage across Janesville, Mukwonago, Racine and Kenosha.

Below you will find video of us chasing the storms and a NWS Milwaukee/Sullivan summary detailing the evolution of the storms and the wind damage they caused across the state.

Here is a video clip of a shelf cloud moving toward our position east of Janesville, Wisconsin -



NWS Summary of June 18, 2010 Storms in Southern Wisconsin

Make sure to browse the news section for additional U.S. and Wisconsin weather news information.


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