Sea Ledger, September 2013

2013-09-01 to 2013-09-30 · archive

issued: 638
warning-days in force: 9,151
in force at month end: 320
sea × type cells: 220

baseline: same month, previous 5 years (2012-09, 2011-09, 2010-09, 2009-09, 2008-09)

By type

type	issued	warning-days	in force at end
Incidents	200	1,027.7	37
Exercises	120	900.6	30
Cable ops	77	1,535.8	56
Nav aids	57	2,232.8	82
Icebergs	35	45.1	2
Quakes	33	103.6	3
Missiles	31	204	5
Surveys	25	1,078	40
Other	18	500.2	16
Derelicts	16	85.1	2
Wrecks	9	728.9	26
Spills	8	165.6	3
Debris	4	11.2	0
Piracy	2	14.9	1
Volcanic	1	33.9	1
Structures	1	90.5	3
Containers	1	3	0
Restricted	0	180	6
Mines	0	30	1
War risk	0	60	2
Ordnance	0	90	3
Towing	0	30	1

By sea and type · 200 cells, most issued first

cell	issued	warning-days	at end	longest d	vs 5 y
Incidents · North Pacific Oceansurge	36	82.9	2	33	2.3× / 15.4
Icebergs · Labrador Seasurge	30	32.7	2	31	4.8× / 6.2
Incidents · Mediterranean Sea - Eastern Basinsurge	26	117.3	3	28	11× / 2.4
Exercises · North Pacific Oceansurge	25	112.9	2	61	2.5× / 9.8
Cable ops · South Atlantic Ocean	24	93.8	5	67	1.1× / 22
Incidents · South China Seasurge	21	107.6	6	32	3.4× / 6.2
Incidents · North Atlantic Oceansurge	20	280.7	7	58	3.5× / 5.8
Incidents · Indian Oceansurge	18	24.6	1	38	3.8× / 4.8
Exercises · Bay of Bengalsurge	13	92.2	3	34	2.2× / 6
Missiles · North Pacific Ocean	13	88.6	2	60	1.7× / 7.8
Incidents · South Atlantic Ocean	13	74.6	3	83	2.0× / 6.6
Quakes · North Pacific Ocean	13	46.9	0	—	1.9× / 6.8
Exercises · Yellow Sea	12	89.5	3	32	1.9× / 6.2
Nav aids · North Sea	10	331.7	13	303	1.1× / 9.2
Quakes · South Pacific Ocean	9	24.9	2	32	0.8× / 11.6
Exercises · South Pacific Ocean	9	20.3	4	24	1.7× / 5.4
Incidents · Coral Seasurge	9	8.5	2	30	4.5× / 2
Cable ops · North Seasurge	8	145.6	5	71	2.9× / 2.8
Cable ops · Gulf of Mexicosurge	8	135.2	6	97	10× / 0.8
Exercises · Philippine Sea	8	74.4	4	33	1.7× / 4.6
Exercises · Arabian Seasurge	8	59.8	3	34	2.2× / 3.6
Incidents · South Pacific Ocean	8	33.4	3	30	1.9× / 4.2
Cable ops · North Atlantic Ocean	7	130.8	6	86	1.1× / 6.4
Cable ops · Caribbean Seanew	7	69	2	46	new / 0
Exercises · Mediterranean Sea - Eastern Basinsurge	7	31.2	0	—	3.9× / 1.8
Surveys · Adriatic Seanew	7	13.7	1	18	new / 0
Incidents · Hudson Baysurge	7	2	0	—	18× / 0.4
Exercises · Black Seasurge	6	36.1	1	24	2.7× / 2.2
Missiles · Barentsz Seasurge	6	27.2	1	33	5.0× / 1.2
Nav aids · Coral Sea	6	15.6	0	—	1.9× / 3.2
Nav aids · Bering Seasurge	6	8.6	0	—	15× / 0.4
Nav aids · English Channellong running	5	108.8	5	543	1.7× / 3
Incidents · Arabian Seasurge	5	49.9	3	29	25× / 0.2
Derelicts · North Atlantic Oceansurge	5	13.7	1	17	3.1× / 1.6
Icebergs · South Atlantic Ocean	5	12.4	0	—	1.7× / 3
Nav aids · South Atlantic Oceanlong running	4	543.3	19	1,867	0.5× / 7.4
Nav aids · North Atlantic Oceanlong running	4	230.6	8	366	0.5× / 8.4
Surveys · South Atlantic Ocean	4	204.7	7	250	1.8× / 2.2
Cable ops · Laptev Seanew	4	59.6	3	21	new / 0
Nav aids · Irish Sea and St. George's Channel	4	32.3	1	110	1.3× / 3
Exercises · Red Seanew	4	23.2	0	—	new / 0
Exercises · Baltic Sea	4	11.7	0	—	1.1× / 3.6
Incidents · The Northwestern Passagesnew	4	0.5	0	—	new / 0
Cable ops · South China Sea	3	323.9	11	145	0.7× / 4.6
Nav aids · Gulf of Mexicolong running	3	165.3	6	692	1.1× / 2.8
Other · North Seasurgelong running	3	122.1	4	383	3.8× / 0.8
Exercises · South Atlantic Ocean	3	74.9	1	37	0.3× / 9.6
Exercises · Aegean Seasurge	3	73.6	4	271	3.8× / 0.8
Nav aids · Inner Seas off the West Coast of Scotlandsurge	3	35.9	1	88	2.1× / 1.4
Cable ops · Mediterranean Sea - Eastern Basin	3	31.9	2	25	1.3× / 2.4
Missiles · North Atlantic Ocean	3	15.4	0	—	0.8× / 3.6
Derelicts · Indian Ocean	3	15	0	—	1.7× / 1.8
Derelicts · North Pacific Ocean	3	13	0	—	1.7× / 1.8
Exercises · Coral Sea	3	11.6	0	—	1.0× / 3
Missiles · Black Sea	3	8.5	1	14	1.1× / 2.6
Incidents · Arafura Seasurge	3	8.4	0	—	5.0× / 0.6
Incidents · Ionian Seasurge	3	8.2	2	14	5.0× / 0.6
Exercises · Indian Ocean	3	7	0	—	0.9× / 3.4
Incidents · Tasman Seasurge	3	0.4	0	—	5.0× / 0.6
Wrecks · Persian Gulflong running	2	144.8	5	391	5.0× / 0.4
Exercises · South China Sea	2	82.2	2	33	0.5× / 4
Wrecks · Arabian Sea	2	58.7	2	165	3.3× / 0.6
Surveys · The Northwestern Passageslong running	2	56.5	3	420	1.7× / 1.2
Other · Hudson Straitnew	2	49.9	2	24	new / 0
Nav aids · Indian Ocean	2	36.5	2	102	1.4× / 1.4
Spills · North Pacific Ocean	2	28	0	—	2.0× / 1
Surveys · Gulf of Mexico	2	27.6	2	180	5.0× / 0.4
Spills · Philippine Seanew	2	26.6	1	18	new / 0
Surveys · Gulf of Suez	2	26	1	28	3.3× / 0.6
Incidents · Malacca Strait	2	22	0	—	10× / 0.2
Incidents · Solomon Sea	2	18.9	1	24	5.0× / 0.4
Incidents · Mozambique Channel	2	15.2	1	35	1.4× / 1.4
Incidents · Gulf of Mexico	2	14.2	0	—	2.5× / 0.8
Cable ops · Arctic Ocean	2	14.1	1	24	5.0× / 0.4
Wrecks · English Channel	2	13.6	1	13	5.0× / 0.4
Surveys · Yellow Sea	2	10.9	1	10	10× / 0.2
Exercises · Barentsz Seanew	2	8.4	0	—	new / 0
Cable ops · English Channel	2	7.6	0	—	10× / 0.2
Derelicts · Arabian Sea	2	6	0	—	10× / 0.2
Quakes · Philippine Sea	2	6	0	—	2.0× / 1
Debris · South Pacific Oceannew	2	6	0	—	new / 0
Exercises · Bering Sea	2	5.6	0	—	1.7× / 1.2
Incidents · Java Seanew	2	5.2	0	—	new / 0
Cable ops · East Siberian Sea	2	5	0	—	10× / 0.2
Incidents · Singapore Strait	2	4.9	1	20	5.0× / 0.4
Nav aids · Tasman Seanew	2	4.7	1	22	new / 0
Quakes · North Atlantic Ocean	2	3.7	1	25	3.3× / 0.6
Other · Indian Ocean	2	3.2	0	—	1.7× / 1.2
Other · Chukchi Sea	2	1	0	—	10× / 0.2
Incidents · Davis Strait	2	0.5	0	—	5.0× / 0.4
Incidents · Timor Sea	2	0.3	0	—	3.3× / 0.6
Other · South China Sea	1	130.7	4	98	5.0× / 0.2
Wrecks · The Northwestern Passageslong running	1	120.1	4	1,121	0.6× / 1.6
Cable ops · Kara Sea	1	92.7	3	66	new / 0
Nav aids · Arabian Sealong running	1	90	3	843	0.7× / 1.4
Nav aids · Gulf of California	1	70.1	3	138	5.0× / 0.2
Other · North Pacific Oceanlong running	1	61.2	2	532	1.3× / 0.8
Nav aids · North Pacific Ocean	1	60.8	2	298	0.4× / 2.4
Incidents · Caribbean Sea	1	59	0	—	0.6× / 1.6
Cable ops · Mozambique Channel	1	56.5	2	133	new / 0
Surveys · North Atlantic Ocean	1	51.2	1	58	0.6× / 1.8
Surveys · Black Sea	1	50.8	1	77	1.0× / 1
Cable ops · Black Sea	1	43.4	2	33	0.6× / 1.8
Exercises · Ionian Sea	1	35.9	1	271	5.0× / 0.2
Missiles · Aegean Sea	1	34.2	1	271	new / 0
Spills · North Atlantic Ocean	1	34	0	—	0.6× / 1.6
Nav aids · Bass Strait	1	32.5	2	182	2.5× / 0.4
Surveys · Mediterranean Sea - Eastern Basin	1	30	1	70	1.0× / 1
Exercises · Laccadive Sea	1	27	1	34	0.3× / 4
Surveys · Gulf of Guinea	1	21.3	1	21	5.0× / 0.2
Incidents · Bay of Biscay	1	20.8	1	57	2.5× / 0.4
Cable ops · Persian Gulf	1	19.6	1	19	1.0× / 1
Other · Andaman or Burma Sea	1	17.5	1	17	new / 0
Spills · The Coastal Waters of Southeast Alaska and British Columbia	1	17	0	—	5.0× / 0.2
Spills · Gulf of Mexico	1	16	1	40	0.2× / 5.6
Incidents · Mediterranean Sea - Western Basin	1	16	0	—	new / 0
Spills · Chukchi Sea	1	14	0	—	new / 0
Cable ops · Barentsz Sea	1	13	0	—	1.0× / 1
Exercises · Tyrrhenian Sea	1	12.5	1	12	new / 0
Incidents · Bay of Bengal	1	10.6	0	—	1.7× / 0.6
Other · Adriatic Sea	1	10.4	1	10	5.0× / 0.2
Missiles · Norwegian Sea	1	9.8	0	—	2.5× / 0.4
Other · North Atlantic Ocean	1	9.4	0	—	1.7× / 0.6
Piracy · Gulf of Guinea	1	9.2	0	—	5.0× / 0.2
Other · Mediterranean Sea - Eastern Basin	1	8.8	0	—	0.6× / 1.6
Surveys · Coral Sea	1	6.7	1	6	new / 0
Missiles · Mediterranean Sea - Eastern Basin	1	6.4	0	—	new / 0
Piracy · South China Sea	1	5.7	1	5	0.5× / 2.2
Exercises · Andaman or Burma Sea	1	5.2	0	—	1.7× / 0.6
Missiles · South Atlantic Ocean	1	5.2	0	—	1.0× / 1
Missiles · Indian Ocean	1	5	0	—	2.5× / 0.4
Incidents · Adriatic Sea	1	4.4	0	—	1.3× / 0.8
Cable ops · Bristol Channel	1	4.2	0	—	new / 0
Volcanic · South Pacific Ocean	1	3.9	0	—	new / 0
Missiles · Arctic Ocean	1	3.7	0	—	2.5× / 0.4
Derelicts · Laccadive Sea	1	3.7	0	—	new / 0
Quakes · Arabian Sea	1	3	0	—	new / 0
Quakes · Banda Sea	1	3	0	—	2.5× / 0.4
Quakes · Celebes Sea	1	3	0	—	5.0× / 0.2
Quakes · Flores Sea	1	3	0	—	new / 0
Cable ops · Greenland Sea	1	3	0	—	5.0× / 0.2
Containers · Gulf of Aden	1	3	0	—	new / 0
Quakes · Indian Ocean	1	3	0	—	0.4× / 2.8
Quakes · Japan Sea	1	3	0	—	5.0× / 0.2
Nav aids · Mediterranean Sea - Western Basin	1	3	0	—	5.0× / 0.2
Debris · Sea of Okhotsk	1	3	0	—	new / 0
Quakes · Solomon Sea	1	3	0	—	1.0× / 1
Derelicts · South Atlantic Ocean	1	3	0	—	0.5× / 2.2
Surveys · North Pacific Ocean	1	2.7	1	2	5.0× / 0.2
Exercises · Adriatic Sea	1	2.4	0	—	1.7× / 0.6
Other · English Channel	1	1.4	0	—	5.0× / 0.2
Other · Tasman Sea	1	1.3	0	—	new / 0
Wrecks · South Pacific Ocean	1	1.1	1	1	new / 0
Debris · North Sea	1	0.9	0	—	new / 0
Other · The Coastal Waters of Southeast Alaska and British Columbia	1	0.9	0	—	new / 0
Derelicts · Bay of Bengal	1	0.7	0	—	1.7× / 0.6
Wrecks · Malacca Strait	1	0.6	0	—	new / 0
Structures · South Atlantic Ocean	1	0.5	0	—	new / 0
Nav aids · Bristol Channel	1	0.3	0	—	2.5× / 0.4
Nav aids · Mediterranean Sea - Eastern Basin	1	0.3	1	0	5.0× / 0.2
Incidents · Savu Sea	1	0.2	0	—	new / 0
Exercises · North Atlantic Ocean	1	0.1	0	—	0.1× / 8
Incidents · Philippine Sea	1	0.1	0	—	0.3× / 3.4
Incidents · Bismarck Sea	1	0	0	—	5.0× / 0.2
Nav aids · Gulf of Alaska	1	0	0	—	0.4× / 2.8
Surveys · Arctic Oceanlong running	0	240	8	1,071	0.0× / 0.8
Surveys · Beaufort Sealong running	0	180	6	1,146	0.0× / 0.6
Wrecks · South Atlantic Oceanlong running	0	150	5	1,237	— / 0
Cable ops · Sea of Okhotsk	0	120	4	117	0.0× / 1
Cable ops · Norwegian Sea	0	117.5	2	172	0.0× / 0.6
Nav aids · Caribbean Sea	0	90	3	311	— / 0
Nav aids · Sea of Okhotsklong running	0	65.4	2	650	0.0× / 0.2
Surveys · Arabian Sea	0	60	2	270	0.0× / 0.4
Nav aids · Kara Sealong running	0	60	2	754	0.0× / 0.2
War risk · Mediterranean Sea - Eastern Basinlong running	0	60	2	859	— / 0
Restricted · North Sealong running	0	60	2	770	0.0× / 0.2
Structures · North Sealong running	0	60	2	777	0.0× / 0.2
Wrecks · North Sea	0	60	2	203	— / 0
Nav aids · Persian Gulf	0	60	2	82	— / 0
Nav aids · South China Sealong running	0	60	2	777	0.0× / 0.2
Incidents · Tyrrhenian Sealong running	0	36.4	1	624	0.0× / 0.4
Wrecks · Arctic Ocean	0	30	1	38	— / 0
Wrecks · Baltic Sea	0	30	1	126	0.0× / 0.2
Towing · Barentsz Sea	0	30	1	107	— / 0
Wrecks · Bay of Bengal	0	30	1	62	— / 0
Surveys · Bering Sea	0	30	1	66	— / 0
Mines · Black Sea	0	30	1	94	— / 0
Ordnance · Black Sea	0	30	1	94	— / 0
Restricted · Black Sea	0	30	1	117	— / 0
Nav aids · Celtic Sea	0	30	1	340	0.0× / 0.6
Surveys · Chukchi Sea	0	30	1	301	0.0× / 0.2
Nav aids · Eastern China Sealong running	0	30	1	594	— / 0
Restricted · English Channel	0	30	1	88	0.0× / 0.2
Cable ops · Gulf of Guinea	0	30	1	32	0.0× / 2.6
Other · Gulf of Mexico	0	30	1	143	— / 0
Wrecks · Gulf of Mexico	0	30	1	101	— / 0
Ordnance · Inner Seas off the West Coast of Scotland	0	30	1	115	— / 0
Other · Kara Sea	0	30	1	52	— / 0
Nav aids · Laccadive Sea	0	30	1	157	0.0× / 0.8
Restricted · North Atlantic Ocean	0	30	1	54	0.0× / 0.2

Cite: seahazards.com Sea Ledger, 2013-09, 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.