Severe Weather and Storm Chasing

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Presentation transcript:

Severe Weather and Storm Chasing A behind the scenes look at what went on during a chase from June 7, 2009 AOS 121 November 2, 2009 Vortex 2 photogrammetry

Thunderstorm Process Air that is warmer than its surroundings is positively buoyant and will rise. As air rises, it does expansion work, and cools. Dry Adiabatic Lapse rate ≈10oC/km Moist Adiabatic Lapse rate ≈6.5oC/km

Thunderstorm Process Cont’d Using a Skew-T diagram, we can see the effect of lifting a parcel of air from the surface. If the surface parcel is warmer, it is likely to rise and form a thunderstorm.

Atmospheric Soundings and Skew-T Diagrams

Temperature Dry Adiabats Moist Adiabats Mixing Ratio Td = Dewpoint T = Temperature

Level of Neutral Buoyancy ~ 280mb Level of Free Convection ~ 660mb Lifting Condensation Level ~830mb

Convective Available Potential Energy Convective INhibition LCL

Real World Example June 19th Sounding from Davenport IA

Summary A Saturated parcel will cool at a slower rate than a Dry air parcel. Convective Available Potential Energy measures the amount of potential energy in the atmosphere. By understanding Skew-T diagrams, we can predict when severe weather may occur.

Storm Chasing Objective Identify weather patterns that will produce rotating thunderstorms. Find a storm that will produce a tornado, and be a safe distance away, yet close enough to see it… Sound easy???

NO WAY!!! A long-lived tornado is on the ground for 10 minutes, and its path length is only a few miles. Most tornadoes are on the ground less than 1 minute. If you are on the wrong side of the storm, all you will see is hail crushing your windshield. Needle in a Haystack.

Long term Forecast (3 days) Look at large scale patterns Storm Prediction Center (SPC)

Short term Forecast (day of) Look smaller features Fronts Clouds Balloon soundings Base support Storm Prediction Center (SPC)

Comparison Long range Short range

Morning Outlook Tornado Hail

Our Chase

Satellite NWS KC 7:15 PM

Radar NWS KC 6:45 PM

Little Hail

Big Hail!!!!

Storm Reports

More Pictures

Storm Prediction Center Acknowledgements NWS Kansas City Office Storm Prediction Center Storm Chasing Class ‘09

Questions ???