Sea Ledger, November 2018

2018-11-01 to 2018-11-30 · archive

issued: 647
warning-days in force: 11,532
in force at month end: 398
sea × type cells: 246

baseline: same month, previous 5 years (2017-11, 2016-11, 2015-11, 2014-11, 2013-11)

By type

type	issued	warning-days	in force at end
Incidents	124	1,194.8	32
Exercises	118	1,309.8	50
Icebergs	81	85.6	4
Nav aids	75	2,629.3	94
Missiles	48	398.7	20
Surveys	47	2,101	71
Quakes	39	112.6	3
Other	30	503.9	17
Derelicts	30	162.7	4
Cable ops	22	363.1	14
Wrecks	11	2,172.1	74
Spills	8	107	5
Piracy	7	51.9	0
Debris	3	9	0
Containers	2	6	0
Restricted	1	30.8	2
Ordnance	1	74.2	2
Structures	0	69.1	1
Volcanic	0	90	3
Storms	0	60	2

By sea and type · 200 cells, most issued first

cell	issued	warning-days	at end	longest d	vs 5 y
Icebergs · Labrador Sea	31	35.6	2	31	1.7× / 18
Icebergs · South Atlantic Oceansurge	30	30.2	2	30	2.2× / 13.8
Other · North Pacific Oceansurge	25	30	1	30	125× / 0.2
Exercises · North Pacific Ocean	24	121.5	6	65	1.4× / 17.4
Incidents · North Atlantic Ocean	22	247.4	7	81	1.3× / 16.8
Incidents · South China Sea	22	201.2	8	44	0.9× / 25.6
Exercises · Mediterranean Sea - Eastern Basinsurge	21	121.9	6	37	3.4× / 6.2
Icebergs · Southern Oceansurge	20	19.8	0	—	3.7× / 5.4
Nav aids · South Atlantic Oceansurge	15	491.7	23	121	2.1× / 7.2
Exercises · South Atlantic Ocean	15	83.5	7	53	1.0× / 15.6
Incidents · North Pacific Ocean	14	107.3	3	48	0.5× / 29.4
Surveys · South Atlantic Ocean	13	196.7	7	241	1.5× / 8.8
Cable ops · North Atlantic Oceansurge	12	80	3	46	6.0× / 2
Quakes · South Pacific Ocean	11	34	0	—	0.8× / 14
Missiles · Barentsz Seasurge	10	52.5	2	32	2.4× / 4.2
Nav aids · North Sea	9	144.8	8	56	0.6× / 14.8
Incidents · Indian Oceansurge	9	88.7	1	39	4.5× / 2
Missiles · North Atlantic Ocean	9	59.2	4	28	1.9× / 4.8
Exercises · Bay of Bengal	8	74.2	3	35	0.7× / 11.8
Incidents · South Atlantic Ocean	8	65.2	1	38	1.2× / 6.8
Nav aids · Coral Seasurge	8	14.9	0	—	2.7× / 3
Surveys · North Atlantic Oceanlong running	7	336.7	12	379	1.7× / 4.2
Exercises · Aegean Sea	7	311.1	11	338	1.1× / 6.4
Missiles · Black Sea	7	102	3	32	1.8× / 3.8
Quakes · South Atlantic Oceansurge	7	23	0	—	3.5× / 2
Surveys · Arabian Sea	6	175.6	7	113	1.7× / 3.6
Exercises · Arabian Sea	6	91.2	2	32	0.8× / 7.2
Spills · Gulf of Mexico	6	60	4	24	1.5× / 4
Missiles · North Pacific Ocean	6	57.3	3	259	1.1× / 5.6
Exercises · Philippine Sea	6	53.4	1	34	1.8× / 3.4
Nav aids · Bass Straitsurge	6	25	2	24	5.0× / 1.2
Derelicts · North Atlantic Ocean	5	37.7	2	30	1.1× / 4.4
Piracy · Gulf of Guinea	5	37.2	0	—	1.5× / 3.4
Missiles · Indian Oceansurge	5	32.9	3	28	2.3× / 2.2
Derelicts · Bay of Bengalsurge	5	15	0	—	3.6× / 1.4
Nav aids · Caribbean Seasurgelong running	4	425	15	445	10× / 0.4
Nav aids · North Atlantic Oceanlong running	4	365.9	7	435	0.9× / 4.6
Exercises · North Atlantic Ocean	4	75.9	3	86	0.7× / 5.6
Incidents · South Pacific Ocean	4	33.9	0	—	0.5× / 7.6
Incidents · Japan Seasurge	4	26	2	24	5.0× / 0.8
Derelicts · Indian Ocean	4	23.6	1	17	1.7× / 2.4
Exercises · Indian Ocean	4	17.8	1	32	1.7× / 2.4
Exercises · Yellow Sea	4	17.4	1	20	0.4× / 10.6
Quakes · Gulf of Alaskanew	4	3.6	2	9	new / 0
Surveys · Arctic Oceannewlong running	3	217.6	8	1,592	new / 0
Wrecks · North Seasurgelong running	3	128.5	5	567	3.8× / 0.8
Nav aids · English Channel	3	71	2	60	0.7× / 4.6
Incidents · Eastern China Seasurge	3	45.7	0	—	2.5× / 1.2
Surveys · North Seasurge	3	42.2	1	71	3.0× / 1
Exercises · Black Sea	3	40.6	3	37	0.4× / 7
Incidents · Caribbean Sea	3	33.1	1	47	0.5× / 6.6
Nav aids · Inner Seas off the West Coast of Scotland	3	31.5	1	54	0.9× / 3.2
Incidents · Mediterranean Sea - Eastern Basin	3	20.6	1	24	0.2× / 14.4
Exercises · South Pacific Ocean	3	14.8	0	—	0.7× / 4.4
Derelicts · English Channelnew	3	9	0	—	new / 0
Quakes · North Atlantic Oceansurge	3	9	0	—	15× / 0.2
Nav aids · Irish Sea and St. George's Channel	3	4	0	—	0.8× / 3.6
Nav aids · South Pacific Ocean	2	129.5	4	116	1.4× / 1.4
Wrecks · Hudson Straitnew	2	119.2	4	55	new / 0
Exercises · South China Sea	2	93.4	0	—	0.5× / 4
Cable ops · Mediterranean Sea - Eastern Basin	2	89.3	3	65	1.3× / 1.6
Nav aids · Indian Oceanlong running	2	63.2	2	468	1.7× / 1.2
Incidents · Philippine Sea	2	60.5	1	67	0.4× / 4.6
Surveys · Persian Gulf	2	50.8	3	65	10× / 0.2
Surveys · Bay of Bengal	2	45.9	2	37	1.0× / 2
Incidents · Mediterranean Sea - Western Basin	2	45.3	1	33	5.0× / 0.4
Surveys · South Pacific Ocean	2	39	1	33	3.3× / 0.6
Derelicts · South Pacific Ocean	2	36	1	30	1.1× / 1.8
Exercises · Laccadive Sea	2	34.7	1	35	0.6× / 3.4
Cable ops · North Sea	2	34.5	2	35	1.3× / 1.6
Nav aids · Strait of Gibraltar	2	32.2	2	197	10× / 0.2
Incidents · Laccadive Sea	2	31.8	0	—	1.7× / 1.2
Exercises · Gulf of Mexico	2	31.6	0	—	1.1× / 1.8
Cable ops · Indian Ocean	2	24.3	1	24	2.0× / 1
Incidents · Arabian Sea	2	24.2	1	42	1.3× / 1.6
Incidents · Gulf of Mexico	2	20.3	1	48	0.4× / 4.6
Incidents · Celtic Sea	2	20	0	—	5.0× / 0.4
Spills · North Atlantic Ocean	2	20	1	18	0.9× / 2.2
Missiles · Japan Seanew	2	19.2	2	15	new / 0
Nav aids · Ionian Seanew	2	15	0	—	new / 0
Missiles · Arctic Ocean	2	11.7	0	—	3.3× / 0.6
Exercises · Japan Sea	2	8.5	1	23	10× / 0.2
Derelicts · North Pacific Ocean	2	7.8	0	—	0.8× / 2.4
Missiles · Norwegian Sea	2	6.7	1	14	2.0× / 1
Quakes · Caribbean Sea	2	6	0	—	5.0× / 0.4
Quakes · North Pacific Ocean	2	6	0	—	0.3× / 6.6
Quakes · Sea of Okhotsk	2	6	0	—	10× / 0.2
Nav aids · Davis Strait	2	3.7	0	—	3.3× / 0.6
Incidents · Bali Seanew	2	2.8	1	2	new / 0
Incidents · Great Australian Bight	2	0.6	0	—	10× / 0.2
Incidents · Tasman Sea	2	0.1	0	—	2.0× / 1
Wrecks · Caribbean Sealong running	1	652.6	22	683	1.7× / 0.6
Nav aids · Gulf of Mexicolong running	1	305.4	10	665	0.4× / 2.6
Wrecks · North Atlantic Oceanlong running	1	184	6	669	1.7× / 0.6
Surveys · The Northwestern Passageslong running	1	180	6	2,307	new / 0
Wrecks · North Pacific Oceanlong running	1	130.6	5	532	2.5× / 0.4
Surveys · Mediterranean Sea - Eastern Basin	1	127.4	3	175	0.3× / 3.2
Wrecks · South China Sea	1	106.3	4	92	1.0× / 1
Nav aids · Arabian Sea	1	76.5	3	112	0.8× / 1.2
Surveys · Sea of Okhotsk	1	67.6	2	54	2.5× / 0.4
Nav aids · Mediterranean Sea - Eastern Basinlong running	1	61	2	422	1.7× / 0.6
Surveys · Barentsz Sea	1	60	2	130	1.0× / 1
Ordnance · North Sea	1	44.2	1	169	1.0× / 1
Nav aids · South China Sea	1	39	2	33	1.0× / 1
Wrecks · Bay of Bengal	1	32.4	2	101	new / 0
Nav aids · Andaman or Burma Sea	1	30	2	126	2.5× / 0.4
Surveys · Adriatic Sea	1	28.4	1	28	0.7× / 1.4
Surveys · Indian Ocean	1	25.5	1	25	0.5× / 2
Nav aids · Mediterranean Sea - Western Basin	1	23.5	1	23	0.7× / 1.4
Surveys · Bay of Biscay	1	22.3	1	22	new / 0
Incidents · Persian Gulf	1	20	0	—	2.5× / 0.4
Incidents · Bay of Bengal	1	19.7	0	—	0.6× / 1.6
Incidents · Bering Sea	1	18	0	—	5.0× / 0.2
Incidents · Strait of Gibraltar	1	15.6	0	—	new / 0
Incidents · Southern Ocean	1	14.3	0	—	5.0× / 0.2
Derelicts · Gulf of Mexico	1	13.7	0	—	1.0× / 1
Other · Tyrrhenian Sea	1	13.6	1	13	new / 0
Nav aids · Celtic Sea	1	12.5	1	12	0.5× / 2
Other · Mediterranean Sea - Western Basin	1	11.6	1	11	new / 0
Other · Philippine Sea	1	11.4	1	11	new / 0
Exercises · Celebes Sea	1	10.6	0	—	new / 0
Wrecks · Persian Gulf	1	10.4	1	10	new / 0
Nav aids · Laccadive Sea	1	9.5	0	—	2.5× / 0.4
Other · North Atlantic Ocean	1	9.4	0	—	0.6× / 1.8
Nav aids · Bay of Bengal	1	9.1	0	—	1.3× / 0.8
Incidents · Alboran Sea	1	7.2	1	7	new / 0
Piracy · Indian Ocean	1	7	0	—	1.0× / 1
Piracy · South China Sea	1	7	0	—	2.5× / 0.4
Cable ops · Caribbean Sea	1	6.3	1	6	1.7× / 0.6
Missiles · Andaman or Burma Sea	1	5.9	0	—	new / 0
Other · Celtic Sea	1	5.9	0	—	new / 0
Cable ops · South China Sea	1	5.5	0	—	0.5× / 2
Exercises · Andaman or Burma Sea	1	5.1	0	—	5.0× / 0.2
Missiles · South Atlantic Ocean	1	5	0	—	2.5× / 0.4
Missiles · South Pacific Ocean	1	4.9	0	—	0.4× / 2.4
Exercises · Arctic Ocean	1	4.6	1	4	new / 0
Cable ops · Mediterranean Sea - Western Basin	1	4.5	1	4	5.0× / 0.2
Quakes · Tasman Sea	1	4.1	0	—	5.0× / 0.2
Exercises · Baltic Sea	1	3.9	0	—	0.3× / 3
Derelicts · Japan Sea	1	3.5	0	—	2.5× / 0.4
Cable ops · Irish Sea and St. George's Channel	1	3.4	1	3	1.0× / 1
Debris · Arafura Sea	1	3	0	—	2.5× / 0.4
Derelicts · Caribbean Sea	1	3	0	—	0.6× / 1.6
Quakes · Celebes Sea	1	3	0	—	5.0× / 0.2
Containers · Celtic Sea	1	3	0	—	5.0× / 0.2
Derelicts · Coral Sea	1	3	0	—	1.0× / 1
Quakes · Eastern China Sea	1	3	0	—	2.5× / 0.4
Quakes · Greenland Sea	1	3	0	—	new / 0
Debris · Gulf of Guinea	1	3	0	—	new / 0
Derelicts · Laccadive Sea	1	3	0	—	2.5× / 0.4
Quakes · Makassar Strait	1	3	0	—	new / 0
Debris · Mediterranean Sea - Eastern Basin	1	3	0	—	new / 0
Derelicts · Mediterranean Sea - Western Basin	1	3	0	—	2.5× / 0.4
Containers · North Sea	1	3	0	—	new / 0
Quakes · Solomon Sea	1	3	0	—	0.7× / 1.4
Derelicts · South China Sea	1	3	0	—	0.7× / 1.4
Quakes · South China Sea	1	3	0	—	2.5× / 0.4
Missiles · South China Sea	1	2.6	0	—	new / 0
Surveys · Aegean Sea	1	2.2	0	—	5.0× / 0.2
Incidents · Davis Strait	1	1.9	1	1	1.0× / 1
Incidents · Gulf of Thailand	1	1.8	0	—	0.4× / 2.6
Incidents · Gulf of Oman	1	1.3	1	1	new / 0
Exercises · Celtic Sea	1	1.2	0	—	1.7× / 0.6
Quakes · Indian Ocean	1	1.2	1	1	0.3× / 3
Nav aids · Great Australian Bight	1	1.1	0	—	1.7× / 0.6
Derelicts · South Atlantic Ocean	1	0.9	0	—	0.7× / 1.4
Restricted · South Atlantic Ocean	1	0.8	1	0	5.0× / 0.2
Surveys · Bass Strait	1	0.6	0	—	new / 0
Incidents · Solomon Sea	1	0.6	0	—	2.5× / 0.4
Derelicts · Mediterranean Sea - Eastern Basin	1	0.5	0	—	2.5× / 0.4
Incidents · Arafura Sea	1	0.3	0	—	0.6× / 1.6
Missiles · Greenland Sea	1	0.3	1	0	2.5× / 0.4
Incidents · Bismarck Sea	1	0.2	0	—	2.5× / 0.4
Incidents · Malacca Strait	1	0.1	0	—	5.0× / 0.2
Incidents · Bass Strait	1	0	0	—	5.0× / 0.2
Surveys · Beaufort Sealong running	0	150	5	2,253	— / 0
Wrecks · The Northwestern Passageslong running	0	121.5	4	461	— / 0
Other · Caribbean Sealong running	0	120	4	679	0.0× / 0.6
Wrecks · Gulf of Mexicolong running	0	120	4	624	0.0× / 0.4
Other · South China Sea	0	120	4	249	0.0× / 1.2
Surveys · Bering Sealong running	0	90	3	507	— / 0
Wrecks · East Siberian Sea	0	90	3	147	— / 0
Wrecks · English Channel	0	90	3	274	0.0× / 0.6
Exercises · Ionian Sea	0	90	3	338	0.0× / 0.2
Wrecks · South Pacific Ocean	0	85	2	74	— / 0
Nav aids · North Pacific Ocean	0	67.1	2	139	0.0× / 4.2
Storms · Caribbean Sealong running	0	60	2	444	— / 0
Volcanic · Caribbean Sea	0	60	2	262	— / 0
Wrecks · Gulf of Guinea	0	60	2	123	— / 0
Surveys · Tasman Sea	0	60	2	90	0.0× / 0.8
Wrecks · South Atlantic Ocean	0	43	1	246	— / 0
Structures · South Atlantic Ocean	0	39.1	0	—	— / 0
Surveys · Andaman or Burma Sea	0	33	0	—	0.0× / 1
Nav aids · Aegean Sea	0	30	1	131	— / 0
Missiles · Aegean Sea	0	30	1	338	0.0× / 1.2
Nav aids · Alboran Sea	0	30	1	103	— / 0
Cable ops · Barentsz Sea	0	30	1	85	— / 0
Surveys · Black Sea	0	30	1	58	0.0× / 0.6
Wrecks · Bristol Channel	0	30	1	190	— / 0
Restricted · Caribbean Sealong running	0	30	1	542	— / 0

Cite: seahazards.com Sea Ledger, 2018-11, 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.