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SFC-3km wind shear ?

What values for SFC-3km wind shear are desirable for tornadic storms ?
Any web sites explaining this ?

Thanks
Jon Miller
 
This page might help with llvl thermodynamics questions -

http://members.cox.net/jondavies1/LLthermo.PDF

Remember that you can still have significant tornadoes in environments with weaker shear than one might hope for, as other factors work to compensate. Though llvl shear has become important in tornado forecasting, it is still just a single element in the bigger picture.

http://members.cox.net/jondavies1/wkshrtor.PDF

For many other considerations that factor into a solid forecast, be sure to visit Jon's additional links on his page:

http://members.cox.net/jdavies1/

Hope this helps -
 
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