Date/Time Sat Diameter (km) Ring % Tb diff (K) Score Meaning JTWC estimate
20110402T225441 ssmis16 NaN 13.7% 2.3 -2.3 n/a   30.0 kts
20110403T011731 ssmis18 179.0 NaN% NaN NaN n/a   29.4 kts
20110403T054319 amsre NaN 17.1% 4.7 -4.7 n/a   25.0 kts
20110403T102658 ssmis17 NaN 15.1% 3.3 -3.3 n/a   24.8 kts
20110403T115707 ssmis18 NaN 20.6% 5.2 -5.2 n/a   24.4 kts
20110403T125410 tmi NaN 0.0% 8.7 -8.7 n/a   23.9 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.