COL Map Ver 4.0

2026-03-0500-001491

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
00Z 24 Mar	60.5	28.5	23.48	200	45.54	-1.38	1.94	0
06Z 24 Mar	62.5	36.5	19.86	300	37.44	-1.35	1.89	0
12Z 24 Mar	63.5	46.0	17.61	200	43.44	-1.34	2.47	0
18Z 24 Mar	65.5	54.5	13.71	600	30.94	-1.63	2.26	0
00Z 25 Mar	66.5	53.5	12.61	200	36.94	-2.12	2.93	0
06Z 25 Mar	71.5	84.0	13.23	1900	14.4	-1.37	1.09	1
12Z 25 Mar	65.0	83.5	13.36	800	28.88	-1.91	2.16	0
18Z 25 Mar	64.0	91.0	13.23	800	28.13	-1.98	2.13	0
00Z 26 Mar	61.5	97.5	13.82	800	27.72	-2.01	2.01	0
06Z 26 Mar	60.0	101.5	12.92	800	26.7	-2.04	2.07	0
12Z 26 Mar	59.0	107.0	10.23	900	21.97	-1.97	2.15	0
18Z 26 Mar	64.0	111.5	10.18	1900	14.03	-1.8	1.38	1
00Z 27 Mar	63.0	114.5	9.99	2000	13.59	-1.83	1.36	0
06Z 27 Mar	62.5	117.0	9.63	1900	13.32	-1.8	1.38	0
12Z 27 Mar	61.5	118.0	8.33	1800	13.44	-1.8	1.61	0
18Z 27 Mar	60.0	115.5	8.34	1500	15.23	-1.87	1.83	0
00Z 28 Mar	52.5	113.0	7.76	200	22.1	-1.9	2.85	0
06Z 28 Mar	52.5	112.0	8.21	700	18.2	-2.24	2.22	0
12Z 28 Mar	51.5	115.5	9.88	700	17.17	-2.15	1.74	0
18Z 28 Mar	50.0	117.5	12.57	500	17.06	-2.07	1.36	0
00Z 29 Mar	48.0	120.0	15.95	400	19.69	-1.76	1.23	0
06Z 29 Mar	47.5	122.5	19.25	400	17.91	-1.72	0.93	1
12Z 29 Mar	46.5	125.0	22.06	400	20.73	-1.61	0.94	0
18Z 29 Mar	47.5	130.0	22.24	400	20.64	-1.11	0.93	1
00Z 30 Mar	48.5	133.5	21.53	400	18.29	-0.96	0.85	1
06Z 30 Mar	48.5	135.5	17.77	600	15.97	-1.22	0.9	1
12Z 30 Mar	49.0	138.0	16.66	700	13.66	-1.31	0.82	1
18Z 30 Mar	49.0	141.0	17.02	800	13.27	-1.36	0.78	1
00Z 31 Mar	49.0	143.0	17.84	700	13.06	-1.38	0.73	0
06Z 31 Mar	49.5	145.0	18.55	600	11.59	-1.36	0.62	1
12Z 31 Mar	51.0	146.5	19.23	600	8.02	-1.26	0.42	1
18Z 31 Mar	51.5	147.0	18.64	500	6.5	-1.59	0.35	1
00Z 01 Apr	51.0	151.0	16.85	600	8.06	-1.21	0.48	1
06Z 01 Apr	51.5	151.5	15.18	500	7.28	-1.48	0.48	1
12Z 01 Apr	51.5	153.5	15.12	500	9.86	-1.42	0.65	1
18Z 01 Apr	52.0	156.0	15.96	500	10.48	-1.34	0.66	1
00Z 02 Apr	52.0	158.5	16.8	500	12.98	-1.46	0.77	1
06Z 02 Apr	52.0	161.0	16.1	500	15.0	-1.55	0.93	1
12Z 02 Apr	52.0	164.0	15.02	400	17.25	-1.52	1.15	1
18Z 02 Apr	52.5	166.5	13.16	500	14.94	-1.58	1.13	1
00Z 03 Apr	53.0	168.5	11.45	300	15.65	-1.53	1.37	1
06Z 03 Apr	53.5	170.5	9.94	300	15.54	-1.62	1.56	1
12Z 03 Apr	54.5	169.5	5.88	200	12.08	-1.84	2.05	0

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.