COL Map Ver 3.0

2025-09-0200-000001

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
06Z 31 Aug	49.0	79.0	22.52	1100	28.35	-1.87	1.26	1
12Z 31 Aug	49.0	82.5	21.31	1100	25.78	-1.77	1.21	1
18Z 31 Aug	47.5	84.0	19.08	1100	27.78	-1.72	1.46	1
00Z 01 Sep	55.5	76.5	19.37	1600	13.92	-2.23	0.72	1
06Z 01 Sep	53.5	79.0	19.39	1800	14.27	-2.07	0.74	1
12Z 01 Sep	53.0	81.5	19.51	1800	14.78	-1.95	0.76	1
18Z 01 Sep	52.0	81.5	19.37	1800	16.46	-1.96	0.85	1
00Z 02 Sep	52.0	77.5	19.69	1000	23.13	-2.2	1.17	1
06Z 02 Sep	51.0	78.0	19.75	900	25.27	-2.1	1.28	1
12Z 02 Sep	51.0	80.5	18.69	1000	24.03	-2.0	1.29	1
18Z 02 Sep	50.0	82.0	17.46	1000	26.31	-1.9	1.51	1
00Z 03 Sep	49.0	83.5	17.8	900	27.51	-1.79	1.55	1
06Z 03 Sep	49.5	85.5	17.51	1400	24.65	-1.82	1.41	1
12Z 03 Sep	49.5	87.0	18.09	1500	24.61	-1.81	1.36	1
18Z 03 Sep	50.0	91.0	18.24	1400	24.19	-1.77	1.33	1
00Z 04 Sep	50.0	94.0	18.19	1400	23.11	-1.68	1.27	1
06Z 04 Sep	50.0	96.0	18.18	1400	23.27	-1.65	1.28	1
12Z 04 Sep	51.0	93.5	18.35	1500	21.21	-1.82	1.16	1
18Z 04 Sep	50.0	95.5	19.24	1500	23.27	-1.74	1.21	1
00Z 05 Sep	50.0	98.0	20.69	1400	23.92	-1.63	1.16	1
06Z 05 Sep	49.0	101.0	21.52	1400	26.25	-1.52	1.22	1
12Z 05 Sep	48.5	103.5	21.71	1400	27.39	-1.48	1.26	1
18Z 05 Sep	48.5	109.5	22.78	1300	28.69	-1.26	1.26	0
00Z 06 Sep	49.5	115.0	23.68	1200	27.96	-1.1	1.18	1
06Z 06 Sep	48.5	115.0	23.94	1300	25.87	-1.21	1.08	1
12Z 06 Sep	49.5	120.0	23.45	1200	25.85	-1.06	1.1	1
18Z 06 Sep	48.5	119.5	23.08	1300	24.19	-1.23	1.05	1
00Z 07 Sep	48.0	122.5	22.26	1300	26.13	-1.23	1.17	1
06Z 07 Sep	48.5	124.5	21.05	1300	25.29	-1.26	1.2	1
12Z 07 Sep	49.0	124.0	19.81	1300	23.82	-1.42	1.2	1
18Z 07 Sep	49.0	125.0	18.79	1300	24.54	-1.44	1.31	1
00Z 08 Sep	49.5	126.5	17.87	1100	25.96	-1.48	1.45	1
06Z 08 Sep	49.0	127.0	16.58	1100	27.72	-1.45	1.67	1
12Z 08 Sep	47.5	120.5	15.84	1200	27.02	-1.57	1.71	1
18Z 08 Sep	48.0	123.0	16.36	1100	26.92	-1.51	1.65	1
00Z 09 Sep	47.0	122.5	16.08	1300	27.19	-1.53	1.69	1
06Z 09 Sep	47.0	122.5	15.89	1200	27.01	-1.52	1.7	1
12Z 09 Sep	47.0	125.0	16.02	1200	28.07	-1.45	1.75	1
18Z 09 Sep	47.5	126.0	16.02	1100	27.35	-1.46	1.71	1
00Z 10 Sep	46.5	128.0	15.42	900	32.03	-1.4	2.08	0
06Z 10 Sep	47.0	130.0	15.22	900	31.68	-1.38	2.08	0
12Z 10 Sep	47.0	132.5	15.77	900	32.57	-1.36	2.07	0
18Z 10 Sep	47.5	136.5	15.48	800	34.73	-1.32	2.24	0
00Z 11 Sep	48.0	139.5	13.83	800	34.13	-1.38	2.47	0
06Z 11 Sep	48.5	144.0	12.2	800	35.79	-1.43	2.93	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.