Date/Time Sat Diameter (km) Ring % Tb diff (K) Score Meaning JTWC estimate
20170220T052024 ssmi15 67.8 30.1% 14.8 -14.8 n/a   40.0 kts
20170220T061527 ssmis16 34.5 16.4% 9.2 -9.2 n/a   40.0 kts
20170220T093534 ssmis18 90.1 0.0% 2.5 -2.5 n/a   40.0 kts
20170220T093647 ssmis18 90.1 0.0% 2.5 -2.5 n/a   40.0 kts
20170220T202901 ssmis18 23.4 35.6% 0.0 -0.0 n/a   37.3 kts
20170220T211300 ssmis17 45.6 17.8% 4.6 -4.6 n/a   36.8 kts
20170221T084537 ssmis18 101.2 0.0% 1.0 -1.0 n/a   31.2 kts
20170221T092409 ssmis18 212.4 0.0% 1.0 -1.0 n/a   30.9 kts
20170221T094949 ssmis17 123.4 0.0% 1.6 -1.6 n/a   30.8 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).