Date/Time Sat Diameter (km) Ring % Tb diff (K) Score Meaning JTWC estimate
20120206T163016 ssmis17 -919.0 -999.0% -999.0 -909.0 n/a   40.4 kts
20120207T042909 ssmis17 179.0 20.6% 8.1 -8.1 n/a   45.0 kts
20120207T072020 ssmis18 NaN 0.0% 0.0 -920.0 n/a   45.0 kts
20120207T161821 ssmis17 NaN 0.0% 0.0 -920.0 n/a   42.1 kts
20120207T183640 ssmis18 NaN 0.0% 0.0 -920.0 n/a   39.2 kts
20120208T040458 ssmis17 101.2 61.6% 5.9 -5.9 n/a   34.9 kts
20120208T040942 ssmis16 101.2 64.4% 7.0 -7.0 n/a   34.9 kts
20120208T065243 ssmis18 123.4 46.6% 8.8 -8.8 n/a   33.9 kts
20120208T155953 ssmis16 167.9 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.