Date/Time Sat Diameter (km) Ring % Tb diff (K) Score Meaning JTWC estimate
20111107T093444 ssmis17 179.0 9.6% 1.7 -1.7 n/a   27.9 kts
20111107T111043 ssmis16 212.4 20.6% 1.6 -1.6 n/a   29.7 kts
20111107T122532 ssmis18 123.4 15.1% 2.8 -2.8 n/a   30.0 kts
20111107T123729 tmi 323.5 NaN% NaN NaN n/a   30.0 kts
20111107T204913 tmi 145.7 NaN% NaN NaN n/a   30.0 kts
20111107T221715 ssmis17 323.5 NaN% NaN NaN n/a   30.0 kts
20111108T011048 ssmis18 312.4 NaN% NaN NaN n/a   29.6 kts
20111108T105811 ssmis16 279.1 NaN% NaN NaN n/a   22.2 kts
20111108T122405 ssmis18 323.5 NaN% NaN NaN n/a   21.4 kts
20111108T220433 ssmis17 45.6 0.0% 2.1 -2.1 n/a   20.0 kts
20111109T005851 ssmis18 67.8 0.0% 2.0 -2.0 n/a   20.0 kts
20111109T101421 ssmis16 34.5 0.0% 2.2 -2.2 n/a   20.0 kts

Key:

Diameter values indicate the estimated surface eyewall diameter (the MI eyewall edge diameter minus 10 km).

Diameter values are red if Ring % <= 65, yellow/brown if Ring % <= 85 and green if Ring % > 85.

"Ring %" is the percentage of the "ring" (eyewall inner boundary) that is 1) colder than the "hot spot" (warmest eye pixel) in the eye by 20K, or 2) the percentage that is a) colder than 232K and b) colder than the "hot spot" by 10K, whichever is greater.

"Tb diff" is the difference between the "hot spot" (warmest eye pixel) and the warmest pixel on the eyewall.

Scores are listed as negative, and not used, when the JTWC or NHC estimated Vmax is <50 kts in order to rule out weak but highly symmetric TCs.