Date/Time Sat Diameter (km) Ring % Tb diff (K) Score Meaning JTWC estimate
20110415T092841 ssmis17 NaN 37.0% 6.0 -6.0 n/a   43.9 kts
20110415T104638 ssmis16 56.7 56.2% 10.6 -10.6 n/a   44.5 kts
20110415T113327 ssmis18 NaN 72.6% 5.3 -5.3 n/a   44.8 kts
20110415T163731 tmi 145.7 NaN% NaN NaN n/a   47.4 kts
20110415T165131 amsre 12.2 100.0% 28.5 -43.5 n/a   47.5 kts
20110415T203844 ssmis17 12.2 89.0% 8.4 -23.4 n/a   49.3 kts
20110415T215626 ssmis16 12.2 100.0% 31.4 -46.4 n/a   49.7 kts
20110416T050640 amsre NaN 39.7% 4.8 4.8 n/a   50.0 kts
20110416T072834 tmi 34.5 56.2% 10.6 10.6 n/a   50.8 kts
20110416T085601 ssmis17 NaN 76.7% 8.1 8.1 n/a   52.4 kts
20110416T095750 ssmis16 23.4 100.0% 18.0 33.0 >65 kts   53.7 kts
20110416T173413 amsre 23.4 54.8% 12.9 12.9 n/a   50.4 kts
20110416T214336 ssmis16 NaN 67.1% 0.0 0.0 n/a   46.7 kts
20110417T001550 ssmis18 45.6 NaN% NaN NaN n/a   44.8 kts
20110417T054951 amsre NaN 58.9% 0.0 -0.0 n/a   42.3 kts
20110417T063356 tmi 12.2 90.4% 0.0 -15.0 n/a   42.0 kts
20110417T090351 ssmis17 NaN 49.3% 0.0 -0.0 n/a   41.1 kts
20110417T102135 ssmis16 NaN 50.7% 0.0 -0.0 n/a   40.7 kts
20110417T162416 tmi NaN 41.1% 2.2 -2.2 n/a   38.2 kts
20110418T000327 ssmis18 212.4 NaN% NaN NaN n/a   35.0 kts
20110418T094813 ssmis16 NaN 0.0% 4.4 -4.4 n/a   30.3 kts
20110418T172128 amsre NaN 0.0% 1.2 -1.2 n/a   29.6 kts
20110418T213203 ssmis17 NaN 39.7% 1.0 -1.0 n/a   27.2 kts
20110418T233929 ssmis18 NaN 13.7% 0.8 -0.8 n/a   25.3 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.