Verification of tracks made of Hernan

I made one track of Tropical Storm Hernan, before it was assessed as a tropical cyclone. I made one more track after that point. Additionally, within 480 hours of cyclogenesis, there were eight instances, when I missed cyclogenesis entirely.

As of this analysis, best track positions are available August 24, 00Z thru August 28, 18Z, and as such, position comparisons are possible only for this timespan.

Since I give only SSHS categories in my tracks, I don't calculate intensity errors in units of speed, but in categories. For this purpose, I define tropical or subtropical storms as "Category 0", tropical or subtropical depressions as "Category -1" and non-existence of a tropical or subtropical cyclone as "Category -2".

In the one track (made before operationally recognized cyclogenesis), range, average and median of formation times was August 24, 00Z.

In the nine cases (1 tracks, before the tracks and data agreed, that tropical storm would remain the peak intensity, and 8 complete misses), peak intensity ranged between Category -2 and  Category 2. Average was Category -1.56 and median was Category -2.

In the two tracks (made before operationally recognized degeneration into remnant low), dissipation times ranged between August 29, 06Z and August 30, 18Z. Average and median were August 30, 00Z.

At the lead time of 1 day (24 hours), there were 1 hit, 0 false detections and 0 misses. 1 available position comparison produces an average error of 91 nautical miles.

At the lead time of 2 days (48 hours), there were 0 hits, 0 false detections and 1 miss. No available position comparisons.

At the lead time of 3 days (72 hours), there were 0 hits, 0 false detections and 1 miss. No available position comparisons.

At the lead time of 4 days (96 hours), there were 0 hits, 1 false detection and 1 miss. 1 available position comparison produces an average error of 153 nautical miles.

At the lead time of 5 days (120 hours), there were 0 hits, 1 false detection and 0 misses. 1 available position comparison produces an average error of 234 nautical miles.

At the lead time of 6 days (144 hours), there were 1 hit, 0 false detections and 0 misses. 1 available position comparison produces an average error of 351 nautical miles.

At the lead time of 7 days (168 hours), there were 1 hit, 0 false detections and 0 misses. 1 available position comparison produces an average error of 543 nautical miles.

At the lead time of 8 days (192 hours), there were 1 hit, 0 false detections and 1 miss. 1 available position comparison produces an average error of 739 nautical miles.

At the lead time of 9 days (216 hours), there were 0 hits, 1 false detection and 1 miss. No available position comparisons.

At the lead time of 10 days (240 hours), there were 0 hits, 1 false detection and 1 miss. No available position comparisons.

At the lead time of 11 days (264 hours), there were 0 hits, 0 false detections and 1 miss. No available position comparisons.

At the lead time of 12 days (288 hours), there were 0 hits, 0 false detections and 1 miss. No available position comparisons.

At the lead time of 13 days (312 hours), there were 0 hits, 0 false detections and 1 miss. No available position comparisons.

At the lead time of 14 days (336 hours), there were 0 hits, 0 false detections and 1 miss. No available position comparisons.

At the lead time of 15 days (360 hours), there were 0 hits, 0 false detections and 1 miss. No available position comparisons.

At the lead time of 16 days (384 hours), there were 0 hits, 0 false detections and 2 misses. No available position comparisons.

At the lead time of 17 days (408 hours), there were 0 hits, 0 false detections and 2 misses. No available position comparisons.

At the lead time of 18 days (432 hours), there were 0 hits, 0 false detections and 2 misses. No available position comparisons.

At the lead time of 19 days (456 hours), there were 0 hits, 0 false detections and 1 miss. No available position comparisons.

At the lead time of 20 days (480 hours), there were 0 hits, 0 false detections and 2 misses. No available position comparisons.

Circle coloration scheme


Here are the tracks once again.

August 20, 06Z:

August 27, 06Z:


The complete misses were from the following model cycles:

August 6, 12Z
August 6, 18Z
August 9, 06Z
August 10, 12Z
August 12, 12Z

August 15, 06Z
August 18, 12Z
August 24, 06Z

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