Date/Time Sat Diameter (km) Ring % Tb diff (K) Score Meaning JTWC estimate
20130107T220534 ssmis17 23.4 53.4% 0.5 -0.5 n/a   35.3 kts
20130108T080613 tmi 12.2 26.6% 5.9 -5.9 n/a   47.5 kts
20130108T091517 ssmis16 12.2 NaN% NaN NaN n/a   48.9 kts
20130108T115247 ssmis18 23.4 NaN% NaN NaN n/a   52.2 kts
20130108T213334 ssmis17 12.2 39.7% 2.0 2.0 n/a   64.6 kts
20130108T225553 tmi 12.2 100.0% 13.6 28.6 >65 kts   66.5 kts
20130109T102946 ssmis17 34.5 39.7% 0.1 0.1 n/a   78.9 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).