2 questions regarding wind shear.
Posted: Mon Sep 28, 2009 8:43 am
1) Excluding mid-level shear, the wind shear is usually calculated by subtracting the 850 mb wind vector from the 200 mb wind vector, correct? If so, why does a sheared tropical cyclone appear to have all of its convection removed from the LLCC? Why is it not merely that the convection does not reach as high, and the tops of the convection aroudn 200 mb are blown away, with everything below it remaining stacked with the LLCC?
2)Strong extratropical low pressure systems (Nor-Easters, et cetera) often exist in areas of extremely high shear; in fact, I remember reading that they need the shear provided by the jet stream. Why are extratropical cyclones not torn to bits by wind shear the way that tropical cyclones are?
Much thanks.
2)Strong extratropical low pressure systems (Nor-Easters, et cetera) often exist in areas of extremely high shear; in fact, I remember reading that they need the shear provided by the jet stream. Why are extratropical cyclones not torn to bits by wind shear the way that tropical cyclones are?
Much thanks.