Sea Ledger, September 2012

2012-09-01 to 2012-09-30 · archive

issued: 467
warning-days in force: 8,018
in force at month end: 251
sea × type cells: 197

baseline: same month, previous 5 years (2011-09, 2010-09, 2009-09, 2008-09, 2007-09)

By type

type	issued	warning-days	in force at end
Exercises	96	957.7	28
Incidents	90	838.8	26
Cable ops	53	1,220.6	42
Nav aids	52	1,592.6	54
Missiles	38	251.7	3
Icebergs	35	48.4	2
Quakes	28	86.2	1
Surveys	27	1,355.7	43
Derelicts	16	124.1	2
Other	12	318.7	12
Containers	8	24.1	0
Spills	3	113	3
Restricted	2	280.5	9
Wrecks	2	540	18
Ordnance	2	94.5	2
Piracy	1	0.4	0
Towing	1	47.6	2
Debris	1	3	0
War risk	0	60	2
Structures	0	30	1
Volcanic	0	30	1

By sea and type · 197 cells, most issued first

cell	issued	warning-days	at end	longest d	vs 5 y
Icebergs · Labrador Seasurge	30	32.9	2	31	150× / 0.2
Incidents · North Pacific Oceansurge	24	121.6	7	34	2.1× / 11.4
Cable ops · South Atlantic Ocean	19	149.3	5	38	0.9× / 22
Incidents · South China Seasurge	12	84.9	3	62	2.7× / 4.4
Cable ops · North Atlantic Oceansurge	11	178.5	7	123	2.2× / 5
Exercises · South Atlantic Ocean	11	159.7	3	33	1.4× / 7.8
Exercises · North Pacific Ocean	11	76.7	3	34	1.1× / 9.8
Incidents · Indian Oceansurge	11	13.1	1	40	3.4× / 3.2
Nav aids · South Atlantic Oceanlong running	10	477.8	15	1,502	1.8× / 5.6
Missiles · Black Seasurge	10	51.2	0	—	17× / 0.6
Missiles · North Atlantic Oceansurge	9	33.5	1	14	5.0× / 1.8
Quakes · North Pacific Ocean	9	20.6	1	32	1.6× / 5.8
Nav aids · North Sea	8	245.6	8	233	0.9× / 9.2
Exercises · South Pacific Ocean	8	37.1	2	29	1.7× / 4.8
Nav aids · English Channelsurge	7	104.1	3	204	3.5× / 2
Nav aids · North Atlantic Ocean	7	48.7	2	260	1.0× / 7.2
Exercises · Black Seasurge	7	43.4	0	—	2.5× / 2.8
Quakes · South Pacific Ocean	7	21	0	—	0.5× / 14
Exercises · Coral Seasurge	7	15.6	1	19	4.4× / 1.6
Incidents · Mediterranean Sea - Eastern Basinsurge	6	80.2	2	40	3.8× / 1.6
Exercises · Bay of Bengal	6	59.2	3	34	1.0× / 5.8
Exercises · Yellow Sea	6	45.5	1	32	1.1× / 5.6
Exercises · Mediterranean Sea - Eastern Basinsurge	6	31.2	1	31	6.0× / 1
Incidents · Philippine Sea	6	19.7	1	24	1.8× / 3.4
Exercises · South China Sea	5	124.4	2	41	1.4× / 3.6
Surveys · South Atlantic Oceansurge	5	102.3	3	107	2.8× / 1.8
Exercises · Philippine Sea	5	70.9	2	32	1.2× / 4.2
Incidents · South Atlantic Ocean	5	53.3	2	33	0.9× / 5.8
Exercises · North Atlantic Ocean	5	42.3	1	31	0.6× / 8.6
Cable ops · Black Seasurge	5	41.8	3	74	5.0× / 1
Derelicts · Indian Oceansurge	5	13.7	0	—	3.6× / 1.4
Cable ops · South China Sea	4	226.3	9	116	1.0× / 4
Cable ops · North Sea	4	120.7	3	72	1.8× / 2.2
Missiles · North Pacific Ocean	4	50.5	1	59	0.5× / 8.2
Nav aids · Irish Sea and St. George's Channel	4	42.7	2	52	1.8× / 2.2
Exercises · Arabian Sea	4	37.6	2	32	1.2× / 3.4
Surveys · North Atlantic Oceansurge	4	35.4	1	34	3.3× / 1.2
Other · Black Seasurge	4	26	1	25	20× / 0.2
Incidents · Mozambique Channelsurge	4	22.2	1	24	6.7× / 0.6
Exercises · Baltic Sea	4	13.2	1	27	1.3× / 3.2
Icebergs · South Atlantic Ocean	4	12.5	0	—	1.3× / 3.2
Containers · Celtic Seanew	4	12	0	—	new / 0
Exercises · Indian Ocean	4	11.2	0	—	1.4× / 2.8
Nav aids · Arabian Seasurgelong running	3	141.5	7	786	3.8× / 0.8
Exercises · Aegean Seasurge	3	120.9	4	274	5.0× / 0.6
Incidents · North Atlantic Ocean	3	102.5	1	62	0.5× / 6.6
Nav aids · Coral Sea	3	33	1	26	1.1× / 2.8
Missiles · White Seanew	3	17.2	0	—	new / 0
Derelicts · North Atlantic Oceansurge	3	10.9	0	—	2.5× / 1.2
Quakes · Indian Ocean	3	10.5	0	—	0.4× / 7.4
Containers · North Atlantic Oceansurge	3	9.1	0	—	15× / 0.2
Cable ops · Barentsz Sea	2	90	3	52	3.3× / 0.6
Nav aids · North Pacific Oceanlong running	2	72.7	2	504	1.0× / 2
Cable ops · Gulf of Guinea	2	66.7	2	122	0.9× / 2.2
Ordnance · North Sealong running	2	64.7	2	1,430	3.3× / 0.6
Surveys · Gulf of Mexiconew	2	62.8	1	38	new / 0
Cable ops · Sea of Okhotsk	2	61.4	1	115	2.5× / 0.8
Other · North Pacific Ocean	2	60	2	167	5.0× / 0.4
Incidents · South Pacific Ocean	2	54	0	—	0.4× / 5
Incidents · Adriatic Sea	2	45.2	2	31	3.3× / 0.6
Surveys · Mediterranean Sea - Eastern Basin	2	44.9	3	120	2.0× / 1
Incidents · Laccadive Sea	2	35.9	1	46	3.3× / 0.6
Derelicts · South Pacific Ocean	2	35.5	1	95	3.3× / 0.6
Incidents · Gulf of Mexico	2	32.8	1	18	5.0× / 0.4
Surveys · Sea of Marmaranew	2	29.5	1	29	new / 0
Cable ops · Arctic Oceannew	2	24.3	1	24	new / 0
Surveys · East Siberian Seanew	2	23	0	—	new / 0
Missiles · South Atlantic Ocean	2	18.2	0	—	3.3× / 0.6
Missiles · Barentsz Sea	2	12.7	0	—	2.5× / 0.8
Missiles · Norwegian Seanew	2	12.5	0	—	new / 0
Surveys · Aegean Seanew	2	10.5	0	—	new / 0
Missiles · Indian Oceannew	2	7.8	0	—	new / 0
Surveys · Black Sea	2	6.5	1	6	3.3× / 0.6
Quakes · Bering Sea	2	6	0	—	2.5× / 0.8
Derelicts · North Pacific Ocean	2	6	0	—	1.4× / 1.4
Exercises · Bering Sea	2	5.9	0	—	2.5× / 0.8
Nav aids · Indian Ocean	2	4.7	0	—	2.0× / 1
Incidents · Timor Sea	2	2.8	0	—	10× / 0.2
Nav aids · Inner Seas off the West Coast of Scotland	2	1.2	0	—	1.3× / 1.6
Nav aids · Gulf of Alaska	2	0.8	0	—	0.8× / 2.4
Incidents · Hudson Baynew	2	0.7	0	—	new / 0
Surveys · Arctic Oceanlong running	1	437	14	821	1.7× / 0.6
Surveys · Beaufort Sealong running	1	121.4	5	781	2.5× / 0.4
Surveys · Yellow Sea	1	84.8	3	66	new / 0
Other · North Atlantic Ocean	1	64.5	2	41	2.5× / 0.4
Nav aids · South Pacific Ocean	1	48.5	2	87	0.7× / 1.4
Incidents · Caribbean Sea	1	34.6	1	52	0.7× / 1.4
Spills · Gulf of Mexico	1	34	0	—	0.2× / 5.8
Other · Persian Gulflong running	1	32.7	2	385	5.0× / 0.2
Wrecks · Arabian Sea	1	30	1	114	2.5× / 0.4
Wrecks · Persian Gulf	1	30	1	36	2.5× / 0.4
Restricted · Bay of Bengal	1	29.7	1	29	new / 0
Incidents · Japan Sea	1	28.8	1	28	2.5× / 0.4
Exercises · Laccadive Sea	1	27.8	1	31	0.2× / 4.6
Surveys · South Pacific Ocean	1	27.7	0	—	1.7× / 0.6
Surveys · Kara Sea	1	24.3	1	34	new / 0
Spills · North Pacific Ocean	1	20	1	39	0.8× / 1.2
Spills · The Coastal Waters of Southeast Alaska and British Columbia	1	20	1	31	new / 0
Cable ops · Gulf of Thailand	1	19.3	1	19	5.0× / 0.2
Other · North Sea	1	18.2	1	18	1.7× / 0.6
Towing · Laptev Sea	1	17.6	1	17	new / 0
Other · South China Sea	1	15.9	1	122	new / 0
Derelicts · South China Sea	1	15.5	0	—	0.6× / 1.6
Incidents · Davis Strait	1	15.2	0	—	5.0× / 0.2
Other · Laptev Sea	1	11.2	0	—	5.0× / 0.2
Incidents · Bay of Bengal	1	8.9	0	—	2.5× / 0.4
Nav aids · Bay of Bengal	1	8.7	0	—	1.3× / 0.8
Restricted · English Channel	1	7.3	0	—	new / 0
Surveys · Laccadive Sea	1	6.5	0	—	new / 0
Cable ops · Mediterranean Sea - Eastern Basin	1	6.5	1	6	0.4× / 2.6
Missiles · Kara Sea	1	5.2	0	—	5.0× / 0.2
Exercises · Andaman or Burma Sea	1	5.1	0	—	2.5× / 0.4
Missiles · Laccadive Sea	1	5.1	0	—	5.0× / 0.2
Missiles · Bay of Bengal	1	5	0	—	1.7× / 0.6
Derelicts · Celtic Sea	1	3.4	0	—	new / 0
Debris · Arabian Sea	1	3	0	—	new / 0
Quakes · Bismarck Sea	1	3	0	—	2.5× / 0.4
Quakes · Celebes Sea	1	3	0	—	new / 0
Derelicts · Coral Sea	1	3	0	—	new / 0
Quakes · Coral Sea	1	3	0	—	0.3× / 3
Icebergs · East Siberian Sea	1	3	0	—	new / 0
Quakes · Gulf of California	1	3	0	—	5.0× / 0.2
Derelicts · Gulf of Mexico	1	3	0	—	new / 0
Quakes · Mediterranean Sea - Eastern Basin	1	3	0	—	new / 0
Quakes · Solomon Sea	1	3	0	—	0.8× / 1.2
Quakes · South Atlantic Ocean	1	3	0	—	1.3× / 0.8
Containers · Tasman Sea	1	3	0	—	new / 0
Missiles · Greenland Sea	1	2.8	0	—	new / 0
Incidents · Celtic Sea	1	1.1	1	1	new / 0
Incidents · Bismarck Sea	1	0.6	0	—	new / 0
Incidents · Bay of Biscay	1	0.5	0	—	2.5× / 0.4
Piracy · Gulf of Guinea	1	0.4	0	—	new / 0
Other · Arabian Sea	1	0.2	0	—	new / 0
Restricted · North Sealong running	0	93.5	3	405	0.0× / 0.4
Wrecks · South Atlantic Oceanlong running	0	90	3	872	— / 0
Surveys · The Northwestern Passages	0	82.1	2	55	0.0× / 1.2
Surveys · Baffin Baylong running	0	60	2	821	0.0× / 0.2
Nav aids · Gulf of Mexico	0	60	2	327	0.0× / 2.8
War risk · Mediterranean Sea - Eastern Basinlong running	0	60	2	494	— / 0
Wrecks · North Atlantic Oceanlong running	0	60	2	408	0.0× / 0.4
Wrecks · North Sea	0	60	2	363	— / 0
Cable ops · Persian Gulf	0	60	2	255	0.0× / 1.2
Nav aids · Sea of Okhotsk	0	60	2	285	0.0× / 0.2
Surveys · Sea of Okhotsk	0	60	2	118	— / 0
Nav aids · South China Sealong running	0	60	2	412	0.0× / 0.2
Wrecks · South China Sea	0	60	2	234	0.0× / 0.2
Wrecks · The Northwestern Passageslong running	0	60	2	756	0.0× / 1.6
Incidents · Tyrrhenian Sea	0	44.4	1	259	0.0× / 0.4
Cable ops · Kara Sea	0	35.7	1	94	— / 0
Surveys · North Pacific Ocean	0	32	1	58	0.0× / 0.2
Cable ops · Norwegian Sea	0	30.1	0	—	0.0× / 0.6
Missiles · Aegean Sea	0	30	1	274	— / 0
Surveys · Barentsz Sea	0	30	1	41	— / 0
Cable ops · Beaufort Sea	0	30	1	57	— / 0
Surveys · Bering Sea	0	30	1	62	0.0× / 0.2
Towing · Bering Sea	0	30	1	35	— / 0
Restricted · Black Sea	0	30	1	45	0.0× / 0.2
Nav aids · Bristol Channel	0	30	1	235	0.0× / 0.4
Nav aids · Celtic Sea	0	30	1	75	0.0× / 0.8
Cable ops · Eastern China Sea	0	30	1	40	0.0× / 0.6
Nav aids · Eastern China Sea	0	30	1	229	— / 0
Wrecks · English Channel	0	30	1	48	0.0× / 0.4
Derelicts · Gulf of Oman	0	30	1	272	— / 0
Other · Hudson Strait	0	30	1	58	— / 0
Exercises · Ionian Sea	0	30	1	274	0.0× / 0.2
Wrecks · Irish Sea and St. George's Channel	0	30	1	101	— / 0
Nav aids · Kara Sealong running	0	30	1	389	0.0× / 0.2
Other · Kara Sea	0	30	1	81	— / 0
Cable ops · Labrador Sea	0	30	1	45	0.0× / 0.6
Nav aids · Mediterranean Sea - Western Basinlong running	0	30	1	408	0.0× / 0.2
Surveys · Mozambique Channel	0	30	1	160	— / 0
Restricted · North Atlantic Ocean	0	30	1	104	0.0× / 0.6
Structures · North Sealong running	0	30	1	412	0.0× / 0.4
Restricted · Persian Gulflong running	0	30	1	668	— / 0
Volcanic · Philippine Sea	0	30	1	154	— / 0
Wrecks · Philippine Sea	0	30	1	139	— / 0
Restricted · Sea of Okhotsk	0	30	1	353	0.0× / 0.2
Wrecks · Sea of Okhotsk	0	30	1	292	— / 0
Spills · South Atlantic Ocean	0	30	1	324	— / 0
Restricted · South Atlantic Ocean	0	30	1	233	— / 0
Nav aids · The Northwestern Passages	0	30	1	66	— / 0
Other · The Northwestern Passageslong running	0	30	1	792	0.0× / 0.2
Wrecks · Yellow Sea	0	30	1	286	— / 0
Ordnance · Kara Sea	0	29.8	0	—	— / 0
Incidents · Java Sea	0	28.4	0	—	— / 0
Cable ops · Philippine Sea	0	20	0	—	0.0× / 0.4
Surveys · Indian Ocean	0	15	0	—	0.0× / 0.2
Spills · North Atlantic Ocean	0	9	0	—	0.0× / 1.8
Incidents · Mediterranean Sea - Western Basin	0	7.4	0	—	— / 0
Quakes · Philippine Sea	0	5.5	0	—	0.0× / 2
Nav aids · Andaman or Burma Sea	0	2.6	0	—	0.0× / 0.2
Derelicts · Chukchi Sea	0	2.3	0	—	— / 0
Quakes · Greenland Sea	0	1.6	0	—	— / 0
Derelicts · Labrador Sea	0	0.5	0	—	— / 0
Derelicts · Timor Sea	0	0.3	0	—	0.0× / 0.2
Surveys · Greenland Sea	0	0	0	—	— / 0
Cable ops · Gulf of Mexico	0	0	0	—	0.0× / 1.4

Cite: seahazards.com Sea Ledger, 2012-09, retrieved 2026-09-03

Not for navigation. Warning-days = days each warning was in force within the month, summed. Only warnings we display are counted; the ratio compares warnings issued with the mean of the reference months.