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Showing posts from November, 2021

Verification of tracks made of Sandra

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I made eight tracks of Tropical Storm Sandra, before it was assessed as a tropical cyclone. I made one more track after cyclogenesis. Additionally, within 504 hours of cyclogenesis, there was one instance, when I missed cyclogenesis entirely. As of this analysis, best track positions are available November 3, 18Z thru November 9, 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 eight tracks (made before operationally recognized cyclogenesis), formation times ranged between November 2, 12Z and November 6, 06Z. Average was November 4, 17Z and median was November 5, 03Z. In the nine cases (8

Verification of tracks made of Terry

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I made three tracks of Tropical Storm Terry, before it was assessed as a tropical cyclone. I made two more tracks after cyclogenesis. Additionally, within 504 hours of cyclogenesis, there were seven instances, when I missed cyclogenesis entirely. As of this analysis, best track positions are available November 2, 00Z thru November 10, 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 three tracks (made before operationally recognized cyclogenesis), formation times ranged between November 3, 18Z and November 5, 12Z. Average was November 4, 14Z and median was November 4, 12Z. In the eleven ca

Verification of tracks made of Rick

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I made twelve tracks of Hurricane Rick, before it was assessed as a tropical cyclone. I made one more track after cyclogenesis. Within 504 hours of cyclogenesis, there were no instances, when I missed cyclogenesis entirely. As of this analysis, best track positions are available October 20, 12Z thru October 26, 00Z, 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 twelve tracks (made before operationally recognized cyclogenesis), formation times ranged between October 15, 06Z and October 28, 12Z. Average was October 22, 22Z and median was October 22, 12Z. In the twelve cases (12 tracks, before t

Verification of tracks made of Pamela

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I made three tracks of Hurricane Pamela, before it was assessed as a tropical cyclone. I made two more tracks after cyclogenesis. Additionally, within 504 hours of cyclogenesis, there were three instances, when I missed cyclogenesis entirely. As of this analysis, best track positions are available October 7, 12Z thru October 14, 00Z, 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 three tracks (made before operationally recognized cyclogenesis), formation times ranged between October 8, 18Z and October 10, 12Z. Average was October 9, 20Z and median was October 10, 06Z. In the seven cases (4 tr

Verification of tracks made of Olaf

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I made one track of Hurricane Olaf, before it was assessed as a tropical cyclone. I made one more track after cyclogenesis. Additionally, within 504 hours of cyclogenesis, there were four instances, when I missed cyclogenesis entirely. As of this analysis, best track positions are available September 4, 12Z thru September 11, 06Z, 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 time was September 7, 06Z. In the five cases (1 track, before the tracks and data agreed, that Category 2 would rema

Verification of tracks made of Nora

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I made two tracks of Hurricane Nora, before it was assessed as a tropical cyclone. I made one more track after cyclogenesis. Additionally, within 504 hours of cyclogenesis, there were two instances, when I missed cyclogenesis entirely. As of this analysis, best track positions are available August 23, 00Z thru August 30, 06Z, 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 two tracks (made before operationally recognized cyclogenesis), formation times ranged between August 27, 12Z and August 28, 06Z. Average and median was August 27, 21Z. In the five cases (3 tracks, before the tracks and data

Verification of tracks made of Marty

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I made one track of Tropical Storm Marty, before it was assessed as a tropical cyclone. I made no tracks after cyclogenesis. Additionally, within 504 hours of cyclogenesis, there were five instances, when I missed cyclogenesis entirely. Marty will be considered continuation of Grace for position error calculations - however, Grace will not be considered Marty for calculation of hits, misses and false detections. As of this analysis, best track / tropical cyclone report positions for Marty, as well as best track positions for Grace, are available August 9, 18Z thru August 27, 06Z, 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

Verification of tracks made of Linda

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I made six tracks of Hurricane Linda, before it was assessed as a tropical cyclone. I made two more tracks after cyclogenesis. Additionally, within 504 hours of cyclogenesis, there were ten instances, when I missed cyclogenesis entirely. As of this analysis, best track positions are available August 8, 18Z thru August 24, 06Z, 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 six tracks (made before operationally recognized cyclogenesis), formation times ranged between August 10, 12Z and August 15, 06Z. Average was August 12, 20Z and median was August 12, 18Z. In the seventeen cases (7 tracks, b