COL Map Ver 4.0

2026-09-0500-001266

The daily central positions of lows are plotted with reference to the time shown at the top of the image. For a description of each column in the table, please refer to the bottom of this page.

timestamp	lat	lon	So	ro	Sb	ang	SR	ex
12Z 25 Sep	71.0	72.5	21.47	400	40.32	-1.91	1.88	0
18Z 25 Sep	69.0	83.0	25.03	400	35.91	-2.04	1.43	0
00Z 26 Sep	67.0	89.5	22.14	600	28.47	-2.18	1.29	1
06Z 26 Sep	65.0	93.0	19.81	800	24.16	-2.29	1.22	1
12Z 26 Sep	64.5	99.0	18.78	1000	17.86	-2.36	0.95	1
18Z 26 Sep	63.5	100.5	19.18	1100	15.46	-2.54	0.81	1
00Z 27 Sep	62.5	102.0	19.17	1200	13.2	-2.66	0.69	1
06Z 27 Sep	61.0	99.0	18.73	1300	13.65	-2.83	0.73	1
12Z 27 Sep	59.5	100.0	17.66	1300	12.46	-2.82	0.71	1
18Z 27 Sep	57.5	100.0	16.99	1300	12.14	-2.73	0.71	1
00Z 28 Sep	56.5	101.5	16.3	1300	11.01	-2.64	0.68	1
06Z 28 Sep	55.5	102.5	15.18	1400	10.82	-2.47	0.71	1
12Z 28 Sep	51.5	112.5	16.77	600	13.2	-1.02	0.79	1
18Z 28 Sep	51.0	115.5	20.59	600	14.02	-0.8	0.68	1
00Z 29 Sep	51.5	117.5	22.14	600	11.95	-0.32	0.54	1
06Z 29 Sep	53.0	117.0	22.12	500	10.68	0.94	0.48	1
12Z 29 Sep	53.0	117.0	21.79	500	10.9	1.61	0.5	1
18Z 29 Sep	50.0	117.5	22.59	1100	6.44	-1.96	0.28	1
00Z 30 Sep	48.5	120.5	23.29	1200	9.27	-1.67	0.4	1
06Z 30 Sep	47.5	123.0	22.9	1100	10.19	-1.54	0.44	1
12Z 30 Sep	46.5	123.5	22.62	1200	12.21	-1.69	0.54	1
18Z 30 Sep	46.5	127.0	22.99	1100	12.68	-1.6	0.55	1
00Z 01 Oct	46.5	130.0	22.76	1100	13.41	-1.47	0.59	1

Columns

Name	Unit	Displayed	Description
timestamp		✓	datetime
detected_id			Vortex ID that matches the detection rule.
ID			Vortex ID at the corresponding time. If a split occurs, the detected_id may not match the detected_id.
lat	deg	✓	Latitude
lon	deg	✓	Longitude
val	m		Geopotential height at the center of the vortex
So	m (100 km)^-1	✓	Optimal slope
ro	km	✓	Optimal radius
Do	m		Optimal depth
Sb	m (100 km)^-1	✓	Intensity of background slope (S_BG)
ang	rad	✓	Direction of S_BG
m	m (100 km)^-1		Eastward component of S_BG
n	m (100 km)^-1		Northward component of S_BG
SR		✓	Ratio of intensity of background slope (S_BG) to optimal slope (S_o) (S_BG/S_o)
ex		✓	COL flag 0: trough 1: COL
Merge			Merge Log 0: None -1: Vortex dissipated -2: Merged from another -3: Present at the end of analysis Vortex ID: Merged into the corresponding vortex and dissipated
Split			Split Log 0: None -1: Vortex generated -2: Split into another -3: Present at the start of analysis Vortex ID: Formed by splitting from the corresponding vortex
generation			Generation Number Set to 1 at the initial analysis time (FT = 0) and incremented when a different vortex ID is encountered as time is traced backward.