COL Map Ver 3.0

2025-04-0200-000031

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
18Z 30 Mar	69.5	105.0	9.84	2600	7.39	-1.13	0.75	1
00Z 31 Mar	74.5	76.5	13.13	1300	16.78	-1.84	1.28	1
06Z 31 Mar	73.0	81.5	11.9	1200	18.0	-1.94	1.51	1
12Z 31 Mar	72.0	84.0	11.72	1000	18.61	-2.05	1.59	1
18Z 31 Mar	72.5	94.5	10.99	2600	10.08	-1.74	0.92	1
00Z 01 Apr	72.5	100.0	11.21	2600	9.15	-1.73	0.82	1
06Z 01 Apr	71.5	104.0	11.19	2600	9.28	-1.78	0.83	1
12Z 01 Apr	71.5	106.5	11.15	2600	9.28	-1.86	0.83	1
18Z 01 Apr	71.5	109.5	11.34	2600	9.01	-1.91	0.79	1
00Z 02 Apr	71.5	111.5	11.58	2600	8.15	-1.92	0.7	1
06Z 02 Apr	72.0	116.5	11.69	2600	6.96	-1.83	0.6	1
12Z 02 Apr	62.5	98.5	10.61	1400	15.73	-2.02	1.48	0
18Z 02 Apr	57.0	97.0	10.76	1800	21.15	-1.95	1.97	0
00Z 03 Apr	56.5	102.0	10.91	1900	20.57	-1.87	1.89	0
06Z 03 Apr	55.0	107.0	10.6	2600	21.54	-1.71	2.03	0
12Z 03 Apr	52.5	109.5	10.28	2600	23.46	-1.7	2.28	0
18Z 03 Apr	52.0	113.0	10.6	2600	23.23	-1.71	2.19	0
00Z 04 Apr	50.0	115.5	10.89	2600	24.62	-1.76	2.26	0
06Z 04 Apr	41.5	115.0	12.81	900	33.05	-1.92	2.58	0
12Z 04 Apr	41.0	117.5	13.27	1000	32.05	-1.91	2.42	0
18Z 04 Apr	40.5	121.0	13.71	1300	32.31	-1.85	2.36	0
00Z 05 Apr	41.0	123.5	14.37	1500	30.75	-1.81	2.14	0
06Z 05 Apr	41.5	124.5	15.46	1600	28.94	-1.83	1.87	0
12Z 05 Apr	41.0	126.5	17.32	1600	28.37	-1.78	1.64	0
18Z 05 Apr	41.5	128.5	18.9	1600	26.35	-1.78	1.39	1
00Z 06 Apr	41.0	128.0	20.4	1500	25.99	-1.78	1.27	1
06Z 06 Apr	41.0	130.5	21.39	1500	25.28	-1.72	1.18	1
12Z 06 Apr	41.0	133.5	21.81	1400	25.14	-1.64	1.15	1
18Z 06 Apr	41.0	135.5	21.79	1500	24.9	-1.55	1.14	1
00Z 07 Apr	40.5	137.5	21.18	1400	26.79	-1.45	1.26	1
06Z 07 Apr	41.0	140.0	20.63	1500	26.24	-1.33	1.27	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.