COL Map Ver 3.0

2025-12-0200-000201

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 23 Dec	58.0	40.0	16.72	1700	10.39	-2.28	0.62	0
06Z 23 Dec	57.5	41.0	17.31	1700	8.71	-2.19	0.5	0
12Z 23 Dec	61.0	53.0	17.61	1300	7.85	-2.22	0.45	1
18Z 23 Dec	61.5	56.0	20.66	1300	9.79	-2.54	0.47	1
00Z 24 Dec	59.5	54.5	21.67	1400	11.68	-2.26	0.54	1
06Z 24 Dec	59.0	57.5	21.12	1400	13.58	-2.08	0.64	1
12Z 24 Dec	59.0	59.5	21.16	1500	15.73	-2.13	0.74	0
18Z 24 Dec	57.5	59.5	19.74	1400	17.63	-2.15	0.89	0
00Z 25 Dec	56.0	59.5	19.12	1300	18.11	-2.03	0.95	0
06Z 25 Dec	55.5	62.5	18.8	1200	19.3	-1.77	1.03	0
12Z 25 Dec	56.0	65.5	18.79	1400	18.47	-1.74	0.98	0
18Z 25 Dec	56.0	64.5	18.04	2200	18.61	-2.06	1.03	0
00Z 26 Dec	56.5	70.0	16.91	1500	17.39	-1.64	1.03	0
06Z 26 Dec	57.5	76.0	16.17	1400	18.59	-1.66	1.15	0
12Z 26 Dec	58.0	79.5	16.95	1200	20.1	-1.67	1.19	0
18Z 26 Dec	66.5	93.5	16.38	2600	14.72	-1.78	0.9	1
00Z 27 Dec	66.0	98.0	16.39	2600	14.29	-1.51	0.87	1
06Z 27 Dec	66.0	103.5	16.03	2600	14.66	-1.19	0.91	1
12Z 27 Dec	65.5	105.5	15.58	2600	15.62	-1.06	1.0	1
18Z 27 Dec	64.5	109.0	15.02	2600	16.25	-1.01	1.08	0
00Z 28 Dec	60.5	115.0	14.57	2600	17.3	-1.25	1.19	1
06Z 28 Dec	57.0	121.5	14.62	2600	18.58	-1.39	1.27	1
12Z 28 Dec	53.0	120.0	15.88	2600	23.25	-1.63	1.46	0
18Z 28 Dec	52.0	126.5	16.67	2600	23.39	-1.53	1.4	0
00Z 29 Dec	50.0	121.5	17.95	2500	26.67	-1.63	1.49	0
06Z 29 Dec	49.0	124.5	19.23	2200	27.51	-1.61	1.43	0
12Z 29 Dec	48.5	125.0	19.95	2100	28.29	-1.61	1.42	1
18Z 29 Dec	49.5	127.5	20.45	2200	26.59	-1.55	1.3	1
00Z 30 Dec	48.5	129.0	20.94	2000	27.46	-1.54	1.31	1
06Z 30 Dec	48.5	129.0	21.39	1900	26.53	-1.57	1.24	1
12Z 30 Dec	47.5	131.5	21.96	1800	26.96	-1.57	1.23	1
18Z 30 Dec	47.5	131.0	22.09	1800	26.12	-1.63	1.18	1
00Z 31 Dec	47.5	132.0	22.41	1700	25.03	-1.65	1.12	1
06Z 31 Dec	47.0	132.0	22.51	1800	25.33	-1.71	1.13	1
12Z 31 Dec	46.5	132.0	23.06	1700	25.02	-1.77	1.09	1
18Z 31 Dec	46.0	133.5	23.35	1700	24.53	-1.75	1.05	1
00Z 01 Jan	44.5	135.0	23.49	1700	26.02	-1.64	1.11	1
06Z 01 Jan	43.5	134.0	23.2	1800	26.48	-1.66	1.14	1
12Z 01 Jan	44.0	136.0	22.92	1900	26.7	-1.63	1.16	1
18Z 01 Jan	42.0	134.0	22.68	1700	29.2	-1.61	1.29	1
00Z 02 Jan	41.0	135.0	23.23	1600	32.09	-1.51	1.38	0
06Z 02 Jan	39.0	134.5	23.46	1600	34.62	-1.48	1.48	0
12Z 02 Jan	45.0	146.5	23.97	1800	30.35	-1.26	1.27	1
18Z 02 Jan	44.0	145.0	24.83	1800	30.82	-1.27	1.24	1
00Z 03 Jan	44.5	147.5	25.57	1800	31.82	-1.23	1.24	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.