Date/Time Sat Diameter (km) Ring % Tb diff (K) Score Meaning NHC estimate
20110831T140220 tmi 12.2 NaN% NaN NaN n/a   28.3 kts
20110831T150900 ssmis18 78.9 19.2% 6.3 -6.3 n/a   27.4 kts
20110831T195746 amsre 12.2 6.8% 1.6 -1.6 n/a   23.0 kts
20110901T001642 ssmis17 145.7 9.6% 2.1 -2.1 n/a   20.0 kts
20110901T022303 ssmis18 145.7 NaN% NaN NaN n/a   20.0 kts
20110901T124955 ssmis17 179.0 1.4% 1.7 -1.7 n/a   0.0 kts
20110901T130643 tmi 167.9 NaN% NaN NaN n/a   0.0 kts
20110901T145619 ssmis18 145.7 0.0% 1.8 -1.8 n/a   0.0 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.