Date/Time Sat Diameter (km) Ring % Tb diff (K) Score Meaning JTWC estimate
20111212T102756 ssmis16 145.7 20.6% 6.0 -6.0 n/a   29.7 kts
20111212T121607 ssmis18 23.4 0.0% 2.2 -2.2 n/a   30.0 kts
20111212T230655 ssmis16 290.2 NaN% NaN NaN n/a   25.0 kts
20111213T003831 ssmis18 223.5 0.0% 4.3 -4.3 n/a   25.0 kts
20111213T095921 ssmis17 56.7 13.7% 4.3 -4.3 n/a   25.0 kts
20111213T101507 ssmis16 34.5 15.1% 3.5 -3.5 n/a   25.0 kts
20111213T225445 ssmis16 145.7 2.7% 0.0 -0.0 n/a   20.6 kts
20111214T002846 ssmis18 179.0 6.8% 5.7 -5.7 n/a   19.8 kts
20111214T101248 ssmis17 12.2 0.0% 2.9 -2.9 n/a   15.6 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.