COL Map Ver 4.0

2026-04-0500-000043

Detail of path

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 31 Mar	51.0	112.5	15.26	300	26.69	-1.74	1.75	0
06Z 31 Mar	49.5	116.0	17.09	300	28.24	-1.71	1.65	0
12Z 31 Mar	48.5	120.5	18.71	300	29.15	-1.38	1.56	0
18Z 31 Mar	49.0	123.0	23.29	400	22.61	-1.35	0.97	0
00Z 01 Apr	49.5	126.0	26.25	400	19.55	-1.11	0.74	1
06Z 01 Apr	50.0	129.0	25.16	400	19.5	-0.87	0.78	1
12Z 01 Apr	51.0	130.5	22.33	500	16.05	-0.85	0.72	1
18Z 01 Apr	51.5	135.5	21.1	400	24.32	-0.5	1.15	0
00Z 02 Apr	53.0	138.5	21.82	300	27.22	-0.23	1.25	0
06Z 02 Apr	54.5	139.0	21.45	400	21.09	-0.09	0.98	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.