Sea Ledger, October 2018

2018-10-01 to 2018-10-31 · archive

issued: 682
warning-days in force: 11,771
in force at month end: 384
sea × type cells: 249

baseline: same month, previous 5 years (2017-10, 2016-10, 2015-10, 2014-10, 2013-10)

By type

type	issued	warning-days	in force at end
Incidents	118	1,199.8	40
Exercises	116	1,301.9	40
Icebergs	88	97.1	3
Surveys	66	2,402.7	80
Nav aids	65	2,432.8	84
Quakes	58	171.4	7
Derelicts	36	120.8	5
Missiles	35	371.2	9
Cable ops	30	372.4	12
Other	23	493.9	16
Wrecks	13	2,091.5	70
Spills	13	179	3
Storms	11	98.4	2
Piracy	5	29.4	2
Ordnance	2	93	3
Structures	1	108.6	4
Restricted	1	35	1
Containers	1	3	0
Volcanic	0	153.9	3
Debris	0	15.6	0

By sea and type · 200 cells, most issued first

cell	issued	warning-days	at end	longest d	vs 5 y
Incidents · South China Sea	32	258.2	7	46	1.2× / 25.8
Icebergs · Labrador Sea	31	36.3	2	32	1.1× / 27.6
Icebergs · South Atlantic Ocean	31	30.8	1	31	2.0× / 15.8
Cable ops · North Atlantic Oceansurge	24	124.2	3	37	8.0× / 3
Icebergs · Southern Oceansurge	24	24	0	—	5.2× / 4.6
Incidents · North Pacific Ocean	22	197.3	6	40	0.9× / 24.2
Exercises · Mediterranean Sea - Eastern Basinsurge	15	74.7	3	35	3.0× / 5
Surveys · Mediterranean Sea - Eastern Basinsurge	14	195.3	7	145	3.9× / 3.6
Exercises · Bay of Bengalsurge	14	102.8	3	36	2.0× / 7
Exercises · Arabian Seasurge	13	82	4	33	2.0× / 6.4
Other · North Pacific Oceansurge	12	11.6	1	11	60× / 0.2
Exercises · North Atlantic Ocean	11	87.7	4	56	1.6× / 6.8
Surveys · North Atlantic Oceansurge	10	378.1	14	349	4.2× / 2.4
Quakes · South Pacific Ocean	10	31.5	1	31	1.0× / 9.8
Quakes · North Pacific Oceansurge	10	30	0	—	2.9× / 3.4
Nav aids · North Sea	9	94.7	5	65	0.8× / 11.6
Exercises · South China Sea	9	39.8	4	35	1.7× / 5.2
Derelicts · North Atlantic Oceansurge	9	20	3	32	2.0× / 4.4
Nav aids · North Atlantic Oceanlong running	8	358.4	13	405	1.2× / 6.6
Incidents · North Atlantic Ocean	8	170.9	5	51	0.7× / 12.4
Exercises · North Pacific Ocean	8	128.1	2	65	0.5× / 15.6
Spills · Gulf of Mexico	8	114	0	—	1.1× / 7.2
Missiles · Barentsz Sea	8	45.7	1	36	1.3× / 6.4
Derelicts · Japan Seasurge	8	23.5	1	28	40× / 0.2
Quakes · Solomon Seasurge	8	21.1	0	—	8.0× / 1
Derelicts · Indian Oceansurge	8	21	0	—	2.7× / 3
Exercises · Aegean Sea	7	324.2	9	308	1.7× / 4.2
Exercises · Black Sea	7	127.9	2	60	0.6× / 11.4
Exercises · South Atlantic Ocean	7	84.7	1	70	0.7× / 10
Nav aids · North Pacific Ocean	7	57.7	3	109	1.8× / 4
Incidents · South Pacific Ocean	7	24.3	2	34	0.8× / 8.4
Surveys · South Atlantic Ocean	6	186.3	7	211	0.4× / 14.8
Quakes · Indian Oceansurge	6	18.6	0	—	6.0× / 1
Missiles · Black Sea	5	98.6	4	32	1.2× / 4.2
Nav aids · English Channel	5	67.4	3	34	1.7× / 3
Missiles · North Atlantic Ocean	5	51.2	0	—	1.0× / 5.2
Incidents · Indian Ocean	5	27.4	1	22	0.9× / 5.4
Quakes · South Atlantic Oceansurge	5	13	3	26	2.8× / 1.8
Nav aids · Great Australian Bight	5	1.4	0	—	1.8× / 2.8
Nav aids · South Atlantic Ocean	4	399.8	13	204	0.5× / 7.8
Incidents · Caribbean Sea	4	97	3	46	0.8× / 5
Exercises · Laccadive Seasurge	4	34.9	2	29	2.0× / 2
Storms · Gulf of Mexicosurge	4	15	0	—	2.5× / 1.6
Storms · Philippine Seanew	4	6.2	0	—	new / 0
Incidents · Bismarck Seasurge	4	4.2	0	—	2.9× / 1.4
Incidents · Coral Sea	4	3.5	0	—	1.0× / 4
Nav aids · Gulf of Mexicolong running	3	263.5	10	635	0.7× / 4.6
Surveys · North Seasurge	3	88.9	2	41	3.8× / 0.8
Incidents · Philippine Sea	3	80.7	4	43	0.4× / 6.8
Missiles · North Pacific Ocean	3	42.2	1	229	0.3× / 9.8
Incidents · Mediterranean Sea - Eastern Basin	3	40.1	0	—	0.2× / 15.6
Derelicts · South Pacific Ocean	3	37	1	62	1.5× / 2
Nav aids · Inner Seas off the West Coast of Scotland	3	36.4	1	66	0.7× / 4.2
Incidents · Java Seasurge	3	24.5	0	—	5.0× / 0.6
Exercises · Yellow Sea	3	24.1	0	—	0.3× / 11.4
Incidents · Mediterranean Sea - Western Basinsurge	3	17.5	1	25	2.1× / 1.4
Exercises · South Pacific Ocean	3	12.7	0	—	0.6× / 5.2
Surveys · Indian Ocean	3	12	0	—	1.4× / 2.2
Quakes · Coral Seasurge	3	9	0	—	7.5× / 0.4
Quakes · North Atlantic Oceansurge	3	9	0	—	2.5× / 1.2
Quakes · Philippine Sea	3	8.9	1	8	1.3× / 2.4
Nav aids · Davis Straitsurge	3	0.5	1	18	5.0× / 0.6
Surveys · The Northwestern Passagesnewlong running	2	183.1	6	2,277	new / 0
Surveys · Beaufort Sealong running	2	163.1	5	2,223	2.0× / 1
Surveys · Arabian Sea	2	132.3	4	83	1.1× / 1.8
Wrecks · North Sealong running	2	123.5	4	537	5.0× / 0.4
Other · South China Sea	2	120.9	4	219	1.0× / 2
Nav aids · South Pacific Ocean	2	119	3	86	1.4× / 1.4
Surveys · Kara Sea	2	100.1	3	111	3.3× / 0.6
Wrecks · South Pacific Ocean	2	72.4	3	44	5.0× / 0.4
Wrecks · South China Sea	2	70.9	3	62	1.3× / 1.6
Nav aids · Indian Oceanlong running	2	62.4	2	438	0.6× / 3.4
Surveys · Sea of Okhotsk	2	52.2	2	45	10× / 0.2
Surveys · Black Sea	2	50.9	2	28	0.9× / 2.2
Surveys · Tasman Sea	2	43	2	60	3.3× / 0.6
Spills · North Atlantic Ocean	2	39	0	—	0.8× / 2.6
Surveys · Bay of Bengal	2	34.6	1	59	0.9× / 2.2
Nav aids · Gulf of Alaska	2	33.9	1	74	1.7× / 1.2
Incidents · Arabian Sea	2	29.9	1	22	0.8× / 2.6
Wrecks · Hudson Straitnew	2	29.5	2	25	new / 0
Wrecks · Gulf of California	2	27.6	1	27	10× / 0.2
Incidents · Gulf of Mexico	2	22.3	1	18	0.8× / 2.4
Incidents · Laccadive Sea	2	22	2	18	2.5× / 0.8
Exercises · Sea of Okhotsknew	2	20.5	0	—	new / 0
Missiles · Kara Sea	2	13.3	0	—	1.7× / 1.2
Piracy · Gulf of Guinea	2	13.1	1	36	1.4× / 1.4
Exercises · Barentsz Sea	2	12.5	0	—	0.9× / 2.2
Nav aids · Tasman Sea	2	11.7	1	22	10× / 0.2
Surveys · South Pacific Ocean	2	11	1	61	10× / 0.2
Incidents · South Atlantic Ocean	2	10.2	2	8	0.3× / 6.4
Missiles · Laccadive Sea	2	10	0	—	2.0× / 1
Piracy · South Atlantic Oceannew	2	9.3	1	7	new / 0
Surveys · North Pacific Ocean	2	8.1	2	5	2.5× / 0.8
Exercises · Mediterranean Sea - Western Basin	2	6.4	0	—	10× / 0.2
Storms · North Pacific Ocean	2	6.3	0	—	10× / 0.2
Quakes · Banda Sea	2	6	0	—	1.4× / 1.4
Icebergs · Laptev Sea	2	6	0	—	2.0× / 1
Quakes · Sea of Okhotsk	2	6	0	—	10× / 0.2
Incidents · Solomon Sea	2	6	0	—	3.3× / 0.6
Surveys · Great Australian Bight	2	5.6	0	—	10× / 0.2
Exercises · Indian Ocean	2	5.4	1	20	2.0× / 1
Derelicts · Mediterranean Sea - Western Basin	2	5.4	0	—	3.3× / 0.6
Quakes · Ionian Sea	2	4.4	1	6	10× / 0.2
Derelicts · Laccadive Sea	2	3.8	0	—	2.0× / 1
Missiles · Southern Oceannew	2	3.2	1	3	new / 0
Nav aids · Coral Sea	2	1.1	0	—	0.8× / 2.6
Incidents · Timor Sea	2	0.4	0	—	2.0× / 1
Nav aids · Caribbean Sealong running	1	482.7	14	415	0.3× / 3.6
Wrecks · North Atlantic Oceanlong running	1	177.5	6	639	5.0× / 0.2
Wrecks · Gulf of Mexicolong running	1	120.6	4	594	5.0× / 0.2
Wrecks · North Pacific Oceanlong running	1	93.7	4	502	new / 0
Structures · South Atlantic Ocean	1	73.9	3	64	1.7× / 0.6
Surveys · South China Sea	1	67.9	2	63	0.8× / 1.2
Ordnance · North Sea	1	62	2	139	1.3× / 0.8
Nav aids · Arabian Sea	1	50.7	2	82	2.5× / 0.4
Surveys · Persian Gulf	1	40.7	1	35	1.0× / 1
Surveys · Andaman or Burma Sea	1	39.5	2	42	5.0× / 0.2
Nav aids · Strait of Gibraltar	1	31.9	1	167	new / 0
Cable ops · North Sea	1	31	1	33	0.4× / 2.8
Other · Sea of Okhotsk	1	30.6	1	30	5.0× / 0.2
Nav aids · Laccadive Sea	1	29.6	1	29	2.5× / 0.4
Missiles · Sea of Okhotsk	1	29.5	0	—	0.6× / 1.8
Other · Hudson Strait	1	25.9	1	25	1.7× / 0.6
Nav aids · Kara Sea	1	20.3	1	20	new / 0
Incidents · Celtic Sea	1	19.8	0	—	new / 0
Cable ops · North Pacific Ocean	1	19.7	1	19	2.5× / 0.4
Surveys · Inner Seas off the West Coast of Scotland	1	18.7	0	—	5.0× / 0.2
Nav aids · Irish Sea and St. George's Channel	1	18.7	0	—	0.3× / 3.6
Incidents · Black Sea	1	18.4	1	18	new / 0
Nav aids · Bay of Bengal	1	18.2	1	37	1.3× / 0.8
Missiles · South Atlantic Ocean	1	17.4	0	—	1.0× / 1
Incidents · Bay of Bengal	1	16.6	1	16	2.5× / 0.4
Incidents · Tyrrhenian Sea	1	16.2	0	—	1.3× / 0.8
Incidents · Mozambique Channel	1	15.6	0	—	0.7× / 1.4
Other · Alboran Sea	1	15	0	—	new / 0
Incidents · Eastern China Sea	1	13.6	1	13	1.7× / 0.6
Exercises · Japan Sea	1	12.5	0	—	new / 0
Missiles · Arctic Ocean	1	11.4	0	—	0.8× / 1.2
Surveys · Timor Sea	1	9.9	0	—	new / 0
Storms · North Atlantic Ocean	1	8.9	0	—	0.4× / 2.6
Surveys · Laccadive Sea	1	8.5	1	8	5.0× / 0.2
Cable ops · Gulf of Guinea	1	8.1	1	8	1.7× / 0.6
Spills · Bering Sea	1	8	1	8	1.7× / 0.6
Other · Ligurian Sea	1	8	0	—	new / 0
Missiles · Bay of Bengal	1	7.1	0	—	1.0× / 1
Piracy · Indian Ocean	1	7	0	—	1.7× / 0.6
Other · North Atlantic Ocean	1	7	0	—	1.7× / 0.6
Exercises · Sea of Azov	1	6.5	1	6	new / 0
Exercises · Red Sea	1	6.1	0	—	new / 0
Exercises · Baltic Sea	1	5.7	0	—	0.3× / 3.6
Surveys · Philippine Sea	1	5.6	1	5	new / 0
Cable ops · Strait of Gibraltar	1	5.5	1	5	new / 0
Incidents · Sea of Okhotsk	1	5.4	1	5	new / 0
Incidents · Gulf of California	1	5.3	1	5	new / 0
Cable ops · Celtic Sea	1	5.1	0	—	1.7× / 0.6
Exercises · Philippine Sea	1	5	1	4	0.2× / 5.8
Spills · Philippine Sea	1	5	1	5	5.0× / 0.2
Other · Solomon Sea	1	4.8	0	—	new / 0
Missiles · Philippine Sea	1	4.7	0	—	new / 0
Restricted · Mediterranean Sea - Eastern Basin	1	4	0	—	new / 0
Nav aids · South China Sea	1	3.6	1	3	new / 0
Derelicts · Bay of Bengal	1	3	0	—	5.0× / 0.2
Quakes · Bismarck Sea	1	3	0	—	1.7× / 0.6
Derelicts · Celtic Sea	1	3	0	—	new / 0
Containers · Coral Sea	1	3	0	—	new / 0
Quakes · Gulf of California	1	3	0	—	2.5× / 0.4
Quakes · Java Sea	1	3	0	—	2.5× / 0.4
Other · Java Sea	1	2.7	1	2	new / 0
Exercises · Ligurian Sea	1	2.5	0	—	new / 0
Cable ops · Indian Ocean	1	2.3	0	—	new / 0
Exercises · Gulf of Thailand	1	2.2	0	—	5.0× / 0.2
Missiles · South China Sea	1	2.2	0	—	new / 0
Missiles · Indian Ocean	1	2.1	0	—	new / 0
Spills · North Pacific Ocean	1	2	1	2	0.6× / 1.8
Quakes · Tasman Sea	1	1.9	1	1	5.0× / 0.2
Missiles · Arabian Sea	1	1.6	1	1	5.0× / 0.2
Derelicts · Coral Sea	1	1.6	0	—	5.0× / 0.2
Surveys · Bass Strait	1	1.1	0	—	new / 0
Derelicts · Caribbean Sea	1	1.1	0	—	2.5× / 0.4
Other · Gulf of Mexico	1	1	1	1	1.3× / 0.8
Ordnance · Black Sea	1	0	0	—	5.0× / 0.2
Other · South Atlantic Ocean	1	0	0	—	5.0× / 0.2
Wrecks · Caribbean Sealong running	0	651	21	653	0.0× / 0.6
Surveys · Arctic Oceanlong running	0	217	7	1,562	0.0× / 1.6
Wrecks · The Northwestern Passageslong running	0	155	5	431	— / 0
Other · Caribbean Sealong running	0	124	4	649	0.0× / 1
Surveys · Bering Sealong running	0	93	3	477	— / 0
Wrecks · East Siberian Sea	0	93	3	117	0.0× / 0.2
Wrecks · English Channel	0	93	3	244	0.0× / 0.6
Exercises · Ionian Sea	0	93	3	308	— / 0
Volcanic · Philippine Sea	0	91.9	1	110	— / 0
Surveys · Barentsz Sea	0	62	2	100	0.0× / 0.8
Storms · Caribbean Sealong running	0	62	2	414	0.0× / 1.4
Volcanic · Caribbean Sea	0	62	2	232	— / 0
Wrecks · Gulf of Guinea	0	62	2	93	0.0× / 0.2
Nav aids · Mediterranean Sea - Eastern Basinlong running	0	62	2	392	0.0× / 0.8
Wrecks · South Atlantic Ocean	0	62	2	216	0.0× / 0.8
Other · English Channel	0	50.8	1	95	0.0× / 0.8
Cable ops · South China Sea	0	42.5	1	38	0.0× / 3.4
Surveys · Gulf of Guinea	0	33	0	—	0.0× / 0.4

Cite: seahazards.com Sea Ledger, 2018-10, 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.