Date/Time Sat Diameter (km) Ring % Tb diff (K) Score Meaning JTWC estimate
20120506T090428 ssmis16 5.0 0.0% 0.0 -0.0 n/a   35.0 kts
20120507T091458 ssmis17 145.7 0.0% 5.8 -5.8 n/a   32.2 kts
20120507T111123 ssmis18 101.2 0.0% 2.2 -2.2 n/a   30.2 kts
20120507T130103 tmi 5.0 0.0% 1.2 -1.2 n/a   30.0 kts
20120508T021316 tmi 78.9 41.1% 0.0 -0.0 n/a   25.0 kts
20120508T071537 ssmi15 167.9 2.7% 4.3 -4.3 n/a   25.0 kts
20120508T091517 ssmis16 34.5 37.0% 1.6 -1.6 n/a   25.0 kts
20120508T120454 tmi 23.4 15.1% 5.1 -5.1 n/a   25.0 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.