Date/Time Sat Diameter (km) Ring % Tb diff (K) Score Meaning JTWC estimate
20170221T013936 ssmi15 45.6 12.3% 1.3 -1.3 n/a   36.3 kts
20170221T021702 ssmis16 101.2 16.4% 1.4 -1.4 n/a   36.7 kts
20170221T055747 ssmis18 67.8 4.1% 2.9 -2.9 n/a   38.7 kts
20170221T125238 ssmi15 5.0 56.2% 3.7 -3.7 n/a   39.9 kts
20170221T134941 ssmis16 12.2 57.5% 0.0 -0.0 n/a   39.7 kts
20170221T171254 ssmis18 NaN 49.3% 0.0 -920.0 n/a   38.0 kts
20170222T012151 ssmi15 67.8 0.0% 2.1 -2.1 n/a   35.0 kts
20170222T015328 ssmis16 145.7 NaN% NaN NaN n/a   35.0 kts
20170222T045750 ssmis18 NaN 50.7% 0.0 -920.0 n/a   35.0 kts
20170222T123811 ssmi15 12.2 0.0% 1.7 -1.7 n/a   35.0 kts
20170222T135233 ssmis16 190.1 NaN% NaN NaN n/a   35.0 kts
20170222T154645 ssmis17 12.2 0.0% 1.5 -1.5 n/a   35.0 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).