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Mid tropospheric front


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This is a pretty sweet example.

 

Check out this sounding from Birmingham, AL. That's a decent inversion between 600 and 500mb. This coincides with a zone of huge vertical wind shear:

 

 

 


P(mb) z(m) V(kt) 
586.8 4267 42 
552.0 4719 72 
540.4 4877 82 
530.0 5022 92 
518.9 5182 102

 

Using the thermal wind relation, this corresponds to a horizontal temperature gradient around 7.5C/100km ~ 21.7F/100mi ... pretty impressive.

post-128-0-94689700-1364315490_thumb.gif

 

Here's the 500mb analysis from 12z this morning. Look at Nashville to Birmingham ... 15kt wind from the north to 105kt wind from the west ... as a consequence, a pretty decent deformation zone. And this coincides with a strong temperature gradient ... as implied by the vertical wind shear.

 

Also, how often do you see so many 500mb wind obs over 100kts? Impressive!

 

post-128-0-16541200-1364318838_thumb.gif

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