Sea Ledger, September 2018

2018-09-01 to 2018-09-30 · archive

issued: 654
warning-days in force: 12,024
in force at month end: 370
sea × type cells: 265

baseline: same month, previous 5 years (2017-09, 2016-09, 2015-09, 2014-09, 2013-09)

By type

type	issued	warning-days	in force at end
Incidents	138	1,129.4	39
Exercises	121	1,422	39
Icebergs	82	90.4	3
Nav aids	70	2,845.4	79
Quakes	45	133.5	10
Missiles	41	445	11
Surveys	40	2,247.4	75
Derelicts	27	128.3	4
Storms	21	105.8	3
Other	17	436.7	15
Cable ops	13	286.9	10
Spills	12	208	5
Wrecks	8	2,064.3	62
Debris	8	36.1	1
Piracy	4	26.3	1
Restricted	2	58.5	1
Volcanic	2	130.1	5
Structures	1	130.3	4
Ordnance	1	96.4	3
Containers	1	3	0

By sea and type · 200 cells, most issued first

cell	issued	warning-days	at end	longest d	vs 5 y
Icebergs · South Atlantic Oceansurge	32	31.5	1	30	2.7× / 11.8
Incidents · South China Sea	31	398	10	43	1.5× / 20.6
Icebergs · Labrador Sea	30	35.7	2	30	1.2× / 25.6
Incidents · North Pacific Ocean	21	108	4	36	0.7× / 31.4
Icebergs · Southern Oceansurge	19	20.2	0	—	7.3× / 2.6
Quakes · South Pacific Ocean	18	53.5	1	32	1.0× / 18.2
Exercises · Bay of Bengal	16	118	4	33	1.8× / 8.8
Incidents · North Atlantic Ocean	14	150.2	4	40	0.9× / 15.2
Missiles · North Pacific Ocean	13	97.1	2	198	1.3× / 10.4
Exercises · Mediterranean Sea - Eastern Basinsurge	13	48.1	3	34	2.2× / 5.8
Exercises · Black Sea	12	132.7	5	41	1.1× / 10.4
Exercises · South Pacific Oceansurge	12	44	0	—	2.1× / 5.6
Nav aids · Coral Seasurge	12	37	0	—	4.3× / 2.8
Exercises · North Pacific Ocean	11	123.2	4	65	0.4× / 30
Exercises · South Atlantic Ocean	10	101.8	1	39	0.9× / 10.8
Nav aids · South Atlantic Ocean	9	415	13	173	1.1× / 8.6
Exercises · North Atlantic Ocean	9	75.1	4	32	1.0× / 9
Incidents · South Pacific Ocean	9	27.1	1	27	1.3× / 7
Storms · North Atlantic Oceansurge	9	21.1	1	19	23× / 0.4
Surveys · South Atlantic Ocean	8	222.2	9	180	1.2× / 6.8
Incidents · Caribbean Sea	8	115.9	5	41	1.3× / 6
Exercises · Aegean Sea	7	300.1	10	277	1.3× / 5.6
Exercises · Arabian Sea	7	68.2	2	34	1.1× / 6.6
Quakes · Makassar Straitnew	7	18	7	2	new / 0
Storms · North Pacific Oceannew	7	7	0	—	new / 0
Nav aids · Caribbean Seasurgelong running	6	518.1	16	495	3.0× / 2
Missiles · North Atlantic Ocean	6	81.4	2	45	1.2× / 5
Incidents · Philippine Sea	6	72.8	3	40	1.1× / 5.4
Incidents · Mediterranean Sea - Eastern Basin	6	34.1	2	100	0.3× / 19.6
Missiles · South Pacific Oceansurge	6	15.7	0	—	15× / 0.4
Nav aids · North Atlantic Oceanlong running	5	383.4	11	583	1.0× / 5
Spills · Gulf of Mexico	5	104	2	33	1.2× / 4.2
Nav aids · North Sealong running	5	92	3	452	0.5× / 9.8
Spills · North Atlantic Oceansurge	5	82	1	40	2.5× / 2
Exercises · Yellow Sea	5	32.9	1	30	0.6× / 9
Nav aids · English Channel	5	23.3	2	12	1.7× / 3
Quakes · Philippine Seasurge	5	17.6	0	—	2.8× / 1.8
Derelicts · Japan Seasurge	5	15	0	—	25× / 0.2
Storms · Gulf of Mexicosurge	5	11.2	0	—	6.3× / 0.8
Incidents · Coral Sea	5	2.1	0	—	0.8× / 6.6
Exercises · South China Sea	4	95.9	1	32	0.7× / 5.8
Surveys · Arabian Seasurge	4	84	5	52	5.0× / 0.8
Surveys · North Sea	4	75	3	53	1.5× / 2.6
Missiles · Sea of Okhotsknew	4	32.9	1	36	new / 0
Cable ops · South China Sea	4	25.6	2	34	1.8× / 2.2
Incidents · Banda Seanew	4	15.8	1	16	new / 0
Other · North Atlantic Oceansurge	4	15.1	2	15	3.3× / 1.2
Quakes · North Pacific Ocean	4	12	0	—	0.4× / 9.6
Quakes · Indian Oceansurge	4	11.4	2	29	4.0× / 1
Nav aids · South Pacific Oceanlong running	3	253.7	6	472	1.9× / 1.6
Nav aids · North Pacific Ocean	3	127.9	2	337	0.7× / 4.2
Surveys · Mediterranean Sea - Eastern Basin	3	123.2	5	171	0.6× / 4.8
Missiles · Black Sea	3	89.5	3	31	0.7× / 4.2
Exercises · Gulf of Mexico	3	32.9	0	—	1.5× / 2
Incidents · Laccadive Seasurge	3	25.9	0	—	5.0× / 0.6
Incidents · Japan Seasurge	3	22.3	1	36	5.0× / 0.6
Incidents · South Atlantic Ocean	3	20	0	—	0.3× / 9
Other · Coral Seasurge	3	19.7	0	—	15× / 0.2
Derelicts · North Atlantic Ocean	3	14.1	1	37	0.9× / 3.2
Debris · South Atlantic Oceannew	3	13.3	1	28	new / 0
Missiles · Barentsz Sea	3	12.5	2	13	0.5× / 6.2
Derelicts · Bay of Bengal	3	11.3	0	—	1.9× / 1.6
Nav aids · Irish Sea and St. George's Channel	3	9.1	1	27	0.7× / 4.4
Derelicts · Mozambique Channelsurge	3	9	0	—	7.5× / 0.4
Quakes · South Atlantic Oceansurge	3	9	0	—	2.1× / 1.4
Derelicts · Indian Ocean	3	6.4	1	6	0.7× / 4.2
Surveys · North Atlantic Ocean	2	278.1	8	318	0.5× / 4.2
Nav aids · Gulf of Mexicolong running	2	266	8	604	0.4× / 5.2
Wrecks · South China Seanewlong running	2	170.3	2	1,602	new / 0
Wrecks · The Northwestern Passageslong running	2	139.8	5	400	1.4× / 1.4
Other · South China Sealong running	2	131.8	4	1,404	1.7× / 1.2
Surveys · South China Sea	2	120.4	3	279	1.1× / 1.8
Surveys · Kara Sea	2	91.3	4	80	1.4× / 1.4
Surveys · Norwegian Sea	2	81.8	1	89	5.0× / 0.4
Volcanic · Philippine Seanewlong running	2	63.7	3	2,345	new / 0
Nav aids · Inner Seas off the West Coast of Scotlandlong running	2	44.5	1	377	0.4× / 4.6
Cable ops · North Atlantic Ocean	2	42.7	2	75	0.3× / 6.6
Missiles · Indian Ocean	2	35.1	0	—	2.0× / 1
Exercises · Sea of Okhotsk	2	33.7	0	—	5.0× / 0.4
Exercises · Philippine Sea	2	30.8	0	—	0.5× / 4.2
Surveys · Persian Gulf	2	29.8	1	62	5.0× / 0.4
Nav aids · Bay of Bengallong running	2	25	1	534	3.3× / 0.6
Surveys · Andaman or Burma Sea	2	23	2	11	10× / 0.2
Incidents · Java Sea	2	14.4	1	18	1.1× / 1.8
Incidents · Eastern China Sea	2	13.7	0	—	10× / 0.2
Piracy · Gulf of Guinea	2	12.3	1	8	3.3× / 0.6
Restricted · Chukchi Seanew	2	11	0	—	new / 0
Incidents · Aegean Seanew	2	7.3	0	—	new / 0
Exercises · Andaman or Burma Sea	2	6.1	0	—	10× / 0.2
Quakes · Bismarck Sea	2	6	0	—	5.0× / 0.4
Quakes · Solomon Sea	2	6	0	—	0.9× / 2.2
Debris · South Pacific Ocean	2	6	0	—	5.0× / 0.4
Derelicts · Mediterranean Sea - Eastern Basin	2	5.8	0	—	3.3× / 0.6
Other · North Sea	2	5.8	0	—	1.4× / 1.4
Other · Celtic Seanew	2	5	0	—	new / 0
Derelicts · North Pacific Ocean	2	4.7	1	30	0.8× / 2.4
Incidents · Indian Ocean	2	2.7	0	—	0.2× / 9.4
Incidents · Bering Sea	2	1.6	0	—	10× / 0.2
Incidents · Tasman Sea	2	1.1	0	—	1.4× / 1.4
Nav aids · Davis Strait	2	0.8	0	—	0.9× / 2.2
Nav aids · Arafura Sea	2	0.4	0	—	5.0× / 0.4
Wrecks · North Atlantic Oceanlong running	1	136.2	5	608	1.7× / 0.6
Surveys · Sea of Okhotsk	1	78.9	1	101	2.5× / 0.4
Ordnance · North Sea	1	60	2	108	0.7× / 1.4
Nav aids · Indian Oceanlong running	1	59.5	2	407	0.5× / 2
Nav aids · Mediterranean Sea - Eastern Basinlong running	1	55.5	2	902	5.0× / 0.2
Surveys · Bay of Bengallong running	1	55.3	1	814	0.7× / 1.4
Nav aids · Mediterranean Sea - Western Basin	1	51.9	1	228	5.0× / 0.2
Cable ops · Barentsz Sea	1	45	1	63	1.7× / 0.6
Nav aids · Gulf of Alaska	1	37.5	1	47	0.8× / 1.2
Nav aids · Alboran Sea	1	36	1	42	new / 0
Structures · Persian Gulflong running	1	33.9	1	756	2.5× / 0.4
Derelicts · South Pacific Ocean	1	33	1	31	0.7× / 1.4
Nav aids · Andaman or Burma Sea	1	31.7	1	65	2.5× / 0.4
Other · English Channel	1	31.4	2	64	1.0× / 1
Nav aids · The Northwestern Passages	1	30.1	1	58	5.0× / 0.2
Surveys · Makassar Strait	1	30	1	82	new / 0
Cable ops · North Sea	1	30	1	44	0.1× / 7.4
Cable ops · Sea of Okhotsk	1	30	1	103	5.0× / 0.2
Surveys · Tasman Sea	1	29.8	1	29	2.5× / 0.4
Cable ops · South Atlantic Ocean	1	27.2	0	—	0.1× / 8.4
Exercises · Laccadive Sea	1	26.9	0	—	0.7× / 1.4
Other · The Northwestern Passages	1	23.7	1	114	0.3× / 3
Surveys · Celtic Sea	1	22.8	1	22	1.0× / 1
Wrecks · South Pacific Oceanlong running	1	20.3	1	370	1.0× / 1
Incidents · Gulf of Mexico	1	17.9	0	—	0.3× / 3.2
Derelicts · South China Sea	1	16	0	—	1.7× / 0.6
Missiles · Norwegian Sea	1	15.9	0	—	5.0× / 0.2
Exercises · Norwegian Sea	1	13.6	0	—	new / 0
Wrecks · Labrador Sea	1	13.5	0	—	new / 0
Incidents · Molukka Sea	1	13.5	1	13	new / 0
Surveys · Bay of Biscay	1	13.3	1	13	5.0× / 0.2
Surveys · Inner Seas off the West Coast of Scotland	1	12	0	—	1.0× / 1
Incidents · Gulf of Thailand	1	11	1	10	1.7× / 0.6
Spills · The Coastal Waters of Southeast Alaska and British Columbia	1	10	1	10	0.8× / 1.2
Cable ops · Indian Ocean	1	9.8	0	—	2.5× / 0.4
Exercises · Red Sea	1	9.6	0	—	0.8× / 1.2
Exercises · Barentsz Sea	1	9.4	0	—	0.6× / 1.6
Missiles · Laptev Sea	1	9.1	0	—	0.5× / 2
Exercises · Sea of Azov	1	8.1	0	—	new / 0
Nav aids · Eastern China Sea	1	7.3	0	—	new / 0
Piracy · Celebes Sea	1	7	0	—	new / 0
Spills · Gulf of Alaska	1	7	1	7	1.7× / 0.6
Piracy · North Atlantic Ocean	1	7	0	—	1.7× / 0.6
Incidents · Halmahera Sea	1	6.3	1	6	new / 0
Incidents · Arafura Sea	1	5	0	—	1.0× / 1
Surveys · Aegean Sea	1	4.9	0	—	5.0× / 0.2
Surveys · Indian Ocean	1	4.7	0	—	1.7× / 0.6
Cable ops · Mediterranean Sea - Eastern Basin	1	4.4	1	4	0.6× / 1.6
Missiles · Laccadive Sea	1	3.9	0	—	0.8× / 1.2
Incidents · Balearic (Iberian Sea)	1	3.8	1	3	5.0× / 0.2
Wrecks · Kara Sea	1	3.4	1	3	5.0× / 0.2
Exercises · Baltic Sea	1	3.2	1	3	0.3× / 3.8
Incidents · Bismarck Sea	1	3.1	0	—	2.5× / 0.4
Debris · Arafura Sea	1	3	0	—	new / 0
Debris · Caribbean Sea	1	3	0	—	1.7× / 0.6
Derelicts · Caribbean Sea	1	3	0	—	1.3× / 0.8
Debris · Celtic Sea	1	3	0	—	new / 0
Icebergs · Laptev Sea	1	3	0	—	0.2× / 4.2
Other · Mediterranean Sea - Eastern Basin	1	3	0	—	1.7× / 0.6
Derelicts · Mediterranean Sea - Western Basin	1	3	0	—	1.3× / 0.8
Containers · North Atlantic Ocean	1	3	0	—	5.0× / 0.2
Derelicts · Tasman Sea	1	3	0	—	2.5× / 0.4
Incidents · Ceram Sea	1	2.7	1	2	new / 0
Incidents · Solomon Sea	1	2.7	1	2	0.6× / 1.8
Incidents · Malacca Strait	1	2.4	1	2	1.7× / 0.6
Cable ops · Persian Gulf	1	2.4	0	—	2.5× / 0.4
Missiles · Arabian Sea	1	1.9	0	—	1.3× / 0.8
Nav aids · Celtic Sea	1	1.5	0	—	0.6× / 1.8
Derelicts · Bismarck Sea	1	1.3	0	—	new / 0
Other · Bismarck Sea	1	0.3	0	—	new / 0
Incidents · Davis Strait	1	0.2	0	—	0.3× / 3.2
Incidents · Timor Sea	1	0.1	0	—	1.7× / 0.6
Incidents · Mozambique Channel	1	0	0	—	0.5× / 2
Wrecks · Caribbean Sealong running	0	630	21	622	0.0× / 0.8
Surveys · Arctic Oceanlong running	0	210	7	1,531	0.0× / 1.2
Surveys · Beaufort Sealong running	0	150	5	2,192	0.0× / 0.4
Surveys · The Northwestern Passageslong running	0	150	5	2,246	0.0× / 0.8
Wrecks · North Sealong running	0	123.6	3	550	0.0× / 0.6
Other · Caribbean Sealong running	0	120	4	618	— / 0
Wrecks · North Pacific Oceanlong running	0	96.5	3	528	0.0× / 0.2
Surveys · Bering Sealong running	0	90	3	446	0.0× / 0.2
Wrecks · East Siberian Sea	0	90	3	86	— / 0
Wrecks · English Channel	0	90	3	213	0.0× / 0.8
Wrecks · Gulf of Mexicolong running	0	90	3	563	0.0× / 0.2
Exercises · Ionian Sea	0	90	3	277	0.0× / 0.4
Nav aids · Arabian Sealong running	0	73	2	521	0.0× / 1.2
Wrecks · Gulf of Guinealong running	0	66.4	2	396	— / 0
Structures · South Atlantic Ocean	0	66.4	2	62	0.0× / 0.2
Surveys · Barentsz Sea	0	60	2	69	0.0× / 1.2
Storms · Caribbean Sealong running	0	60	2	383	0.0× / 1.6
Volcanic · Caribbean Sea	0	60	2	201	— / 0
Surveys · Gulf of Guinea	0	60	2	135	0.0× / 0.2
Wrecks · South Atlantic Ocean	0	60	2	185	0.0× / 0.4
Wrecks · Arabian Sealong running	0	55.9	1	710	0.0× / 1.2
Wrecks · Indian Oceanlong running	0	36.5	1	451	0.0× / 0.2
Wrecks · Bristol Channellong running	0	36.4	1	387	0.0× / 0.2
Wrecks · Mediterranean Sea - Eastern Basin	0	34.5	1	340	0.0× / 0.2
Nav aids · Aegean Sea	0	30	1	70	— / 0
Missiles · Aegean Sea	0	30	1	277	0.0× / 0.6

Cite: seahazards.com Sea Ledger, 2018-09, 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.