Date/Time Sat Diameter (km) Ring % Tb diff (K) Score Meaning JTWC estimate
20110611T153311 ssmis18 NaN 28.8% 8.7 -8.7 n/a   35.0 kts
20110611T192046 tmi NaN 32.9% 0.0 -0.0 n/a   35.0 kts
20110611T210546 ssmis18 NaN 52.0% 1.5 -1.5 n/a   35.0 kts
20110611T213158 amsre 101.2 NaN% NaN NaN n/a   35.0 kts
20110612T082630 amsre NaN 11.0% 2.5 -2.5 n/a   30.0 kts
20110612T121557 ssmis17 NaN 30.1% 0.9 -0.9 n/a   29.2 kts
20110612T132016 ssmis16 179.0 NaN% NaN NaN n/a   28.7 kts
20110612T152121 ssmis18 NaN 4.1% 2.9 -2.9 n/a   27.3 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.