Prediction of Frontogenetically Forced Precipitation Bands
Prediction of Frontogenetically Forced Precipitation Bands
Prediction of Frontogenetically Forced Precipitation Bands
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Using EPV to Measure Stability<br />
• EPV = Equivalent Potential Vorticity<br />
• A relatively simple, quick, and effective way to evaluate CSI/MSI.<br />
Gravitational instability may also be present.<br />
Defined by Moore and Lambert (1993) as follows:<br />
EPV<br />
=<br />
⎡⎛<br />
g⎢⎜<br />
⎣⎝<br />
∂M<br />
∂p<br />
g<br />
∂θ<br />
∂x<br />
e<br />
⎞<br />
⎟ −<br />
⎠<br />
⎛<br />
⎜<br />
⎝<br />
∂M<br />
∂x<br />
g<br />
∂θ<br />
∂p<br />
(TERM 1) (TERM 2)<br />
e<br />
⎞⎤<br />
⎟⎥<br />
⎠⎦<br />
• The closer EPV is to zero, the more responsive the atmosphere will<br />
be to a given amount <strong>of</strong> forcing.<br />
• IF EPV
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