Date/Time Sat Diameter (km) Ring % Tb diff (K) Score Meaning JTWC estimate
20170127T101925 ssmis17 12.2 31.5% 0.0 -0.0 n/a   35.0 kts
20170127T111202 ssmis18 190.1 15.1% 2.0 -2.0 n/a   35.0 kts
20170127T222611 ssmis18 134.5 23.3% 1.4 -1.4 n/a   44.4 kts
20170128T072505 ssmis16 212.4 NaN% NaN NaN n/a   44.3 kts
20170128T105917 ssmis18 101.2 NaN% NaN NaN n/a   40.4 kts
20170128T191733 ssmi15 167.9 1.4% 3.4 -3.4 n/a   39.7 kts
20170128T230053 ssmis17 145.7 13.7% 2.8 -2.8 n/a   36.2 kts
20170129T074913 ssmi15 134.5 0.0% 0.0 -0.0 n/a   30.0 kts
20170129T113358 ssmis17 201.2 0.0% 2.4 -2.4 n/a   29.5 kts
20170129T190132 ssmi15 212.4 0.0% 0.1 -0.1 n/a   25.0 kts
20170129T204851 ssmis16 179.0 0.0% 1.6 -1.6 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.

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).