Date/Time Sat MW Eye diam (km) Est RMW (km) Ring % Tb diff (K) Score Meaning JTWC estimate
20210420T222057 amsr2_85 55.5 22.8 17.8% 20.3 -20.3 n/a   45.0 kts
20210421T024352 ssmis17_85 44.4 17.2 NaN% NaN NaN n/a   48.4 kts
20210421T103711 amsr2_85 55.5 22.8 100.0% 26.3 41.3 >65 kts   58.3 kts
20210421T130734 ssmi15_85 33.3 11.7 58.9% 6.2 6.2 n/a   59.1 kts
20210421T133120 ssmis18_85 44.4 17.2 82.2% 13.7 13.7 n/a   58.7 kts
20210421T152225 ssmis17_85 122.1 11.7 82.2% 16.6 16.6 n/a   57.2 kts
20210422T013233 ssmis16_85 22.2 NaN 56.2% 0.0 -920.0 n/a   49.4 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).