Sea Ledger, August 2013

2013-08-01 to 2013-08-31 · archive

issued: 544
warning-days in force: 9,083
in force at month end: 278
sea × type cells: 212

baseline: same month, previous 5 years (2012-08, 2011-08, 2010-08, 2009-08, 2008-08)

By type

type	issued	warning-days	in force at end
Incidents	156	940.9	22
Cable ops	77	1,466.9	48
Exercises	68	692.6	27
Nav aids	50	2,475.5	75
Derelicts	44	177.3	1
Icebergs	34	43.2	2
Quakes	30	80.8	6
Missiles	23	196	3
Other	17	471.4	13
Surveys	15	1,128.7	35
Wrecks	10	678.7	23
Debris	6	14.7	1
Spills	6	115	5
Structures	3	98	3
Containers	3	11.4	0
Restricted	1	188.4	6
Piracy	1	20.1	0
Mines	0	31	1
War risk	0	62	2
Ordnance	0	93	3
Towing	0	66.4	1
Volcanic	0	31	1

By sea and type · 200 cells, most issued first

cell	issued	warning-days	at end	longest d	vs 5 y
Cable ops · South Atlantic Ocean	36	135	3	37	1.7× / 21.4
Incidents · North Pacific Oceansurge	35	67.8	3	32	2.3× / 15.4
Icebergs · Labrador Seasurge	25	26.1	2	24	3.9× / 6.4
Incidents · Indian Oceansurge	21	21.2	1	30	3.6× / 5.8
Incidents · South Pacific Ocean	18	66.8	1	47	2.0× / 9.2
Incidents · South China Seasurge	16	137.7	1	44	2.1× / 7.6
Incidents · Mediterranean Sea - Eastern Basinsurge	13	70.4	0	—	7.2× / 1.8
Exercises · Yellow Seasurge	12	116.1	3	38	2.6× / 4.6
Derelicts · Indian Oceansurge	11	28.7	0	—	7.9× / 1.4
Nav aids · South Atlantic Oceanlong running	10	645.9	18	1,837	1.5× / 6.8
Incidents · North Atlantic Ocean	10	140.7	4	53	1.9× / 5.4
Exercises · North Pacific Ocean	10	83.5	3	66	1.0× / 9.8
Quakes · North Pacific Ocean	10	22.1	4	27	1.5× / 6.8
Nav aids · North Sealong running	9	404.5	11	421	1.2× / 7.6
Quakes · South Pacific Ocean	9	26.8	1	33	0.9× / 9.8
Cable ops · South China Sea	8	265.7	11	143	1.9× / 4.2
Cable ops · North Seasurge	8	148.1	7	45	2.9× / 2.8
Incidents · Caribbean Seasurge	7	95.1	4	45	5.8× / 1.2
Exercises · South Atlantic Ocean	7	22.7	5	38	0.9× / 7.6
Other · Mediterranean Sea - Eastern Basinsurge	6	43.7	0	—	15× / 0.4
Exercises · Mediterranean Sea - Eastern Basinsurge	6	26	1	31	4.3× / 1.4
Icebergs · Davis Straitnew	6	7.5	0	—	new / 0
Cable ops · North Atlantic Ocean	5	125	3	180	0.7× / 7.4
Missiles · North Pacific Ocean	5	53.3	1	61	0.7× / 7.4
Exercises · Bay of Bengal	5	45.4	2	35	1.0× / 5
Derelicts · South Pacific Oceansurgelong running	5	43.8	1	430	4.2× / 1.2
Incidents · Mozambique Channelsurge	5	39.6	1	30	3.1× / 1.6
Nav aids · North Atlantic Ocean	4	231.6	7	336	0.9× / 4.6
Surveys · South Atlantic Oceansurge	4	183.5	6	220	2.2× / 1.8
Cable ops · Kara Seanew	4	110.4	4	45	new / 0
Nav aids · North Pacific Oceansurge	4	68.5	2	268	2.9× / 1.4
Cable ops · Caribbean Seasurge	4	54.8	1	21	10× / 0.4
Surveys · North Atlantic Ocean	4	54.3	1	67	1.3× / 3.2
Incidents · Gulf of Mexicosurge	4	51.2	0	—	5.0× / 0.8
Spills · North Atlantic Ocean	4	47	2	34	1.4× / 2.8
Exercises · Arabian Sea	4	44.5	2	35	1.3× / 3.2
Derelicts · South Atlantic Oceansurge	4	34	0	—	6.7× / 0.6
Exercises · Black Seasurge	4	26	0	—	4.0× / 1
Exercises · Baltic Seasurge	4	25.1	0	—	3.3× / 1.2
Missiles · Barentsz Seasurge	4	22.6	1	21	2.5× / 1.6
Missiles · Bay of Bengalsurge	4	19.8	0	—	6.7× / 0.6
Quakes · Tasman Seasurge	4	12	0	—	20× / 0.2
Derelicts · Singapore Straitnew	4	9.6	0	—	new / 0
Nav aids · South Pacific Oceansurge	4	7.3	1	24	2.2× / 1.8
Nav aids · Gulf of Mexicolong running	3	155.4	7	662	1.7× / 1.8
Cable ops · Gulf of Mexicosurge	3	81.4	4	147	3.8× / 0.8
Exercises · South China Sea	3	66.9	3	35	0.8× / 4
Other · South China Seasurge	3	66.7	4	68	7.5× / 0.4
Wrecks · The Northwestern Passagessurgelong running	3	55	4	1,091	15× / 0.2
Exercises · Philippine Sea	3	51.5	1	35	0.6× / 4.8
Incidents · South Atlantic Ocean	3	51.5	1	53	0.5× / 6
Missiles · South Atlantic Oceansurge	3	27.8	0	—	7.5× / 0.4
Missiles · North Atlantic Ocean	3	16.3	0	—	1.7× / 1.8
Incidents · Coral Sea	3	13.6	1	42	0.8× / 3.6
Exercises · Coral Seasurge	3	12.4	2	38	2.1× / 1.4
Derelicts · North Atlantic Ocean	3	9.6	0	—	1.1× / 2.6
Icebergs · South Atlantic Ocean	3	9.6	0	—	1.5× / 2
Containers · Arabian Seasurge	3	9	0	—	15× / 0.2
Derelicts · Arabian Seanew	3	9	0	—	new / 0
Derelicts · Mediterranean Sea - Eastern Basinsurge	3	9	0	—	7.5× / 0.4
Incidents · Singapore Straitnew	3	5.6	0	—	new / 0
Derelicts · South China Seasurge	3	4.6	0	—	2.1× / 1.4
Nav aids · Coral Sea	3	3.7	0	—	1.1× / 2.8
Incidents · The Northwestern Passagesnew	3	1.8	0	—	new / 0
Wrecks · South Atlantic Oceanlong running	2	140.9	5	1,207	5.0× / 0.4
Wrecks · Persian Gulf	2	123.4	4	361	10× / 0.2
Cable ops · Black Sea	2	74	2	51	3.3× / 0.6
Nav aids · Inner Seas off the West Coast of Scotland	2	41.9	1	58	1.7× / 1.2
Nav aids · Bass Straitnew	2	31.1	1	152	new / 0
Incidents · Bay of Biscay	2	30.8	1	27	3.3× / 0.6
Surveys · North Sea	2	26	1	25	1.7× / 1.2
Missiles · South Pacific Ocean	2	14.1	0	—	5.0× / 0.4
Incidents · Philippine Sea	2	12.3	0	—	0.8× / 2.4
Incidents · Davis Strait	2	12.1	0	—	2.5× / 0.8
Surveys · South China Seanew	2	8.5	1	8	new / 0
Missiles · Indian Ocean	2	7.7	0	—	10× / 0.2
Derelicts · Caribbean Sea	2	6	0	—	2.5× / 0.8
Quakes · Coral Sea	2	6	0	—	0.5× / 3.8
Quakes · Indian Ocean	2	6	0	—	0.7× / 2.8
Derelicts · Timor Sea	2	6	0	—	5.0× / 0.4
Debris · South Atlantic Oceannew	2	4	0	—	new / 0
Nav aids · Tasman Sea	2	1.7	0	—	1.1× / 1.8
Exercises · South Pacific Ocean	2	1.6	0	—	0.6× / 3.6
Incidents · Baffin Bay	2	0.7	0	—	10× / 0.2
Cable ops · Norwegian Sea	1	168.5	5	142	0.5× / 2
Cable ops · Sea of Okhotsk	1	117.6	4	87	2.5× / 0.4
Nav aids · English Channellong running	1	109.1	3	513	0.5× / 2.2
Other · North Sea	1	103.9	3	353	1.7× / 0.6
Nav aids · Sea of Okhotsklong running	1	67.2	3	620	5.0× / 0.2
Other · South Atlantic Ocean	1	66.9	1	86	2.5× / 0.4
Surveys · Black Sea	1	59.4	2	99	1.0× / 1
Wrecks · North Sea	1	49.3	2	173	2.5× / 0.4
Nav aids · The Northwestern Passages	1	45.4	0	—	new / 0
Incidents · Tyrrhenian Sealong running	1	39.4	2	594	1.7× / 0.6
Incidents · Laccadive Sea	1	37.7	0	—	2.5× / 0.4
Exercises · Laccadive Sea	1	36.4	1	184	0.3× / 3.8
Other · North Atlantic Oceanlong running	1	34.9	1	376	1.7× / 0.6
Restricted · North Atlantic Ocean	1	31	1	91	2.5× / 0.4
Cable ops · Tasman Sea	1	26.4	0	—	5.0× / 0.2
Spills · Gulf of Mexico	1	26	1	44	0.2× / 5.6
Cable ops · Gulf of Guinea	1	25.6	1	63	1.3× / 0.8
Other · Kara Sea	1	22.5	1	22	5.0× / 0.2
Cable ops · Gulf of Thailand	1	22.3	0	—	new / 0
Surveys · Sea of Azov	1	14.5	0	—	new / 0
Piracy · Singapore Strait	1	13.7	0	—	new / 0
Incidents · Mediterranean Sea - Western Basin	1	13.2	1	13	2.5× / 0.4
Structures · North Atlantic Ocean	1	11.2	1	11	new / 0
Spills · The Coastal Waters of Southeast Alaska and British Columbia	1	11	1	11	1.7× / 0.6
Other · Coral Sea	1	10.7	0	—	new / 0
Cable ops · Persian Gulf	1	9.9	0	—	0.6× / 1.8
Wrecks · Arctic Ocean	1	8.5	1	8	new / 0
Cable ops · Inner Seas off the West Coast of Scotland	1	8.4	0	—	new / 0
Incidents · Arabian Sea	1	7.6	0	—	0.8× / 1.2
Derelicts · Mediterranean Sea - Western Basin	1	7	0	—	2.5× / 0.4
Derelicts · Gulf of Mexico	1	6.4	0	—	new / 0
Wrecks · Mediterranean Sea - Western Basin	1	6.4	0	—	new / 0
Exercises · Japan Sea	1	5.3	1	5	0.2× / 4.2
Exercises · Andaman or Burma Sea	1	3.9	0	—	1.7× / 0.6
Other · Tasman Sea	1	3.7	0	—	new / 0
Nav aids · Great Australian Bight	1	3.4	0	—	0.7× / 1.4
Incidents · Bay of Bengal	1	3.3	1	3	0.6× / 1.6
Surveys · Philippine Sea	1	3.3	1	3	5.0× / 0.2
Other · Arabian Sea	1	3	0	—	2.5× / 0.4
Quakes · Banda Sea	1	3	0	—	1.3× / 0.8
Debris · Caribbean Sea	1	3	0	—	new / 0
Debris · Coral Sea	1	3	0	—	new / 0
Derelicts · Persian Gulf	1	3	0	—	new / 0
Quakes · Sea of Okhotsk	1	3	0	—	5.0× / 0.2
Debris · South China Sea	1	3	0	—	new / 0
Exercises · Indian Ocean	1	2.5	0	—	0.5× / 2.2
Incidents · Bismarck Sea	1	2.3	0	—	5.0× / 0.2
Quakes · Bismarck Sea	1	1.9	1	1	0.6× / 1.6
Debris · Mediterranean Sea - Eastern Basin	1	1.7	1	1	new / 0
Exercises · Alboran Sea	1	1.3	0	—	new / 0
Incidents · Celtic Sea	1	1.3	0	—	new / 0
Nav aids · Gulf of Alaska	1	1.1	0	—	0.4× / 2.4
Nav aids · The Coastal Waters of Southeast Alaska and British Columbia	1	1.1	1	1	0.4× / 2.8
Nav aids · Bristol Channel	1	1	0	—	5.0× / 0.2
Structures · Mediterranean Sea - Eastern Basin	1	1	0	—	2.5× / 0.4
Derelicts · North Pacific Ocean	1	0.6	0	—	0.4× / 2.8
Structures · South Atlantic Ocean	1	0.4	0	—	new / 0
Other · Arafura Sea	1	0.1	0	—	new / 0
Surveys · Arctic Oceanlong running	0	248	8	1,041	0.0× / 1.2
Surveys · Beaufort Sealong running	0	186	6	1,116	0.0× / 0.2
Nav aids · Arabian Sealong running	0	93	3	813	0.0× / 0.4
Nav aids · Caribbean Sea	0	93	3	281	0.0× / 0.2
Exercises · Aegean Sea	0	90.5	2	241	— / 0
Structures · North Sealong running	0	85.4	2	747	0.0× / 0.2
Surveys · Gulf of Mexico	0	71	2	150	0.0× / 0.2
Surveys · Arabian Sea	0	62	2	240	— / 0
Wrecks · Arabian Sea	0	62	2	135	0.0× / 0.6
Nav aids · Gulf of California	0	62	2	108	0.0× / 0.4
Nav aids · Kara Sealong running	0	62	2	724	— / 0
War risk · Mediterranean Sea - Eastern Basinlong running	0	62	2	829	— / 0
Other · North Pacific Oceanlong running	0	62	2	502	0.0× / 0.2
Restricted · North Sealong running	0	62	2	740	0.0× / 1.2
Nav aids · Persian Gulf	0	62	2	52	— / 0
Nav aids · South China Sealong running	0	62	2	747	0.0× / 0.2
Surveys · The Northwestern Passageslong running	0	62	2	390	0.0× / 2.4
Nav aids · Indian Ocean	0	36.6	1	72	0.0× / 3.2
Surveys · North Pacific Ocean	0	34	0	—	0.0× / 0.4
Restricted · Black Sea	0	33.4	1	278	0.0× / 0.4
Missiles · Aegean Sea	0	31	1	241	— / 0
Cable ops · Arafura Sea	0	31	1	94	— / 0
Wrecks · Baltic Sea	0	31	1	96	— / 0
Towing · Barentsz Sea	0	31	1	77	— / 0
Wrecks · Bay of Bengal	0	31	1	32	— / 0
Surveys · Bering Sea	0	31	1	36	0.0× / 0.2
Mines · Black Sea	0	31	1	64	— / 0
Ordnance · Black Sea	0	31	1	64	— / 0
Cable ops · Celtic Sea	0	31	1	38	0.0× / 0.8
Nav aids · Celtic Sea	0	31	1	310	0.0× / 1.8
Surveys · Chukchi Sea	0	31	1	271	— / 0
Nav aids · Eastern China Sealong running	0	31	1	564	— / 0
Restricted · English Channel	0	31	1	58	— / 0
Other · Gulf of Mexico	0	31	1	113	— / 0
Wrecks · Gulf of Mexico	0	31	1	71	— / 0
Ordnance · Inner Seas off the West Coast of Scotland	0	31	1	85	— / 0
Exercises · Ionian Sea	0	31	1	241	0.0× / 0.2
Nav aids · Irish Sea and St. George's Channel	0	31	1	80	0.0× / 3
Nav aids · Laccadive Sea	0	31	1	127	— / 0
Surveys · Mediterranean Sea - Eastern Basin	0	31	1	53	0.0× / 0.4
Cable ops · Mozambique Channel	0	31	1	103	0.0× / 0.4
Wrecks · North Atlantic Oceanlong running	0	31	1	693	0.0× / 0.2
Ordnance · North Sealong running	0	31	1	647	— / 0
Volcanic · Philippine Sealong running	0	31	1	489	— / 0
Restricted · Sea of Okhotsklong running	0	31	1	688	— / 0
Nav aids · Singapore Strait	0	31	1	33	— / 0
Spills · South Atlantic Oceanlong running	0	31	1	659	— / 0
Wrecks · South China Sea	0	31	1	121	— / 0
Wrecks · Yellow Sea	0	30.4	0	—	— / 0
Nav aids · Alboran Sea	0	27.6	0	—	— / 0
Wrecks · Coral Sea	0	23.4	0	—	— / 0
Wrecks · Inner Seas off the West Coast of Scotland	0	23.4	0	—	— / 0
Other · Persian Gulf	0	22.3	0	—	0.0× / 0.8
Towing · Baltic Sea	0	19	0	—	— / 0
Towing · Bay of Bengal	0	16.4	0	—	— / 0
Surveys · Gulf of Suez	0	10	0	—	— / 0
Incidents · Arafura Sea	0	9.4	0	—	0.0× / 0.2
Surveys · Irish Sea and St. George's Channel	0	9.4	0	—	0.0× / 0.4

Cite: seahazards.com Sea Ledger, 2013-08, 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.