Date/Time Sat MW Eye diam (km) Est RMW (km) Ring % Tb diff (K) Score Meaning JTWC estimate
20180920T072637 amsr2_85 188.7 89.5 2.7% 3.4 -3.4 n/a   35.0 kts
20180920T193806 amsr2_85 55.5 22.8 NaN% NaN NaN n/a   35.0 kts
20180921T081037 amsr2_85 122.1 56.1 2.7% 0.8 -0.8 n/a   30.0 kts
20180921T101913 ssmis16_85 133.2 61.7 NaN% NaN NaN 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).