Some info on the Dvorak "Bulls-eye"
Posted by JAC on 7/31/2009, 11:06 am



2km Storm Relative IR Imagery with BD Enhancement Curve


The same infrared imagery shown in the earth relative framework is displayed in a storm relative framework, with a 2km resolution and enhanced with the "BD Curve" which is useful for directly inferring intensity via the Dvorak Enhanced IR (EIR) technique.

Scaling is provided by two lightly hatched circles around the center.

The two circles have radii of 1 and 2 degrees latitude, respectively.

The image shown in the link below places the center of the image and the COC together.  

http://rammb.cira.colostate.edu/products/tc_realtime/4kmsrbdc_loop.asp?storm_identifier=EP062009&starting_image=2009EP06_4KMSRBDC_200907301330.jpg

A bulls-eye is then drawn around the inferred COC.

One at 1-degree lat and the second at 2-degree lat.

The closer the deep convection fires at the COC, the more organized a TC is.

So, if it is in the inner bulls-eye; it suggests a well organized TC.

In fact, this latest image of Lana suggests it could be entering a second phase of strengthening.



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EPAC TS Lana (06E) forms, Hawaii could be affected - JAC, 7/30/2009, 2:54 pm
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