Date/Time Sat Diameter (km) Ring % Tb diff (K) Score Meaning JTWC estimate
20121223T014008 ssmis16 156.8 50.7% 4.9 -4.9 n/a   35.0 kts
20121223T035127 ssmis18 201.2 46.3% 5.3 -5.3 n/a   35.0 kts
20121223T113718 ssmi15 145.7 4.1% 8.6 -8.6 n/a   39.9 kts
20121223T141527 ssmis17 134.5 13.7% 4.8 -4.8 n/a   40.0 kts
20121223T224352 tmi 134.5 11.0% 3.0 -3.0 n/a   40.0 kts
20121224T001501 ssmi15 45.6 2.7% 0.0 -0.0 n/a   40.0 kts
20121224T083515 tmi 34.5 NaN% NaN NaN n/a   38.0 kts
20121224T134631 ssmis17 112.3 8.2% 3.8 -3.8 n/a   35.0 kts
20121224T135935 ssmis16 90.1 16.2% 4.2 -4.2 n/a   35.0 kts
20121224T164425 ssmis18 134.5 11.0% 1.0 -1.0 n/a   34.8 kts
20121224T214648 tmi 45.6 0.0% 3.3 -3.3 n/a   32.0 kts
20121225T024416 ssmis17 201.2 0.0% 1.9 -1.9 n/a   30.0 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.

Error messages in intensity scores: -920 is used when the hottest pixel in the eye is <200K, to prevent false positives; -909 is a failure to process (bad input data).