Date/Time Sat Diameter (km) Ring % Tb diff (K) Score Meaning NHC estimate
20110720T210827 ssmis16 NaN 12.3% 9.3 -9.3 n/a   39.4 kts
20110720T230300 ssmis18 NaN 24.7% 3.2 -3.2 n/a   43.6 kts
20110721T093144 ssmis16 NaN 19.2% 2.5 -2.5 n/a   50.0 kts
20110721T095013 ssmis17 NaN 23.3% 4.5 -4.5 n/a   50.0 kts
20110721T111127 tmi 23.4 NaN% NaN NaN n/a   50.0 kts
20110721T112457 ssmis18 NaN 9.6% 3.3 -3.3 n/a   50.0 kts
20110721T193415 ssmis17 45.6 28.8% 10.2 -10.2 n/a   49.2 kts
20110721T193553 ssmis17 45.6 16.4% 10.2 -10.2 n/a   49.1 kts
20110721T205716 ssmis16 NaN 13.7% 7.7 -7.7 n/a   47.6 kts
20110721T225233 ssmis18 NaN 0.0% 8.6 -8.6 n/a   45.5 kts
20110721T225341 ssmis18 NaN 0.0% 6.6 -6.6 n/a   45.4 kts
20110722T091706 ssmis16 NaN 0.0% 6.4 -6.4 n/a   45.0 kts
20110722T111236 ssmis18 NaN 11.0% 4.3 -4.3 n/a   43.7 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.