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CAPE AND LI USING GOES SOUNDER

METEOROLOGIST JEFF HABY

CAPE and LI not only can be calculated by using the Skew-T diagram, but GOES satellites also have that ability. The advantage of GOES derived CAPE and LI are (1) frequent updates (makes for a better nowcast) and (2) Can assess measurements over ocean bodies and regions where Skew-T data is lacking. The disadvantages are that (1) GOES remote sensing derived values are not as accurate as in-situ measurements from Skew-T and (2) Values can not be determined underneath cloud cover (cloud contamination).

CAPE interpretation:
1 - 500: small but positive
501 - 1,499: moderate
1,500 - 2,499: large
2,500+: extreme

LI interpretation
Greater than 0: stable
-1 to -4: marginal instability
-4 to -7: large instability
-8 or less: extreme instability

CAPE and LI are especially impressive if extreme instability covers a large region such as most of the warm sector of a mid-latitude cyclone. This sounder information can be found at:

http://cimss.ssec.wisc.edu/goes/realtime/