Sea Ledger, December 2018

2018-12-01 to 2018-12-31 · archive

issued: 630
warning-days in force: 12,093
in force at month end: 366
sea × type cells: 226

baseline: same month, previous 5 years (2017-12, 2016-12, 2015-12, 2014-12, 2013-12)

By type

type	issued	warning-days	in force at end
Exercises	107	1,317.4	34
Incidents	102	1,029.6	26
Icebergs	82	89.2	3
Nav aids	66	3,023.8	97
Surveys	57	2,036	70
Missiles	49	437.9	6
Quakes	44	128.3	2
Other	39	475.3	15
Derelicts	29	162.7	7
Wrecks	13	2,465	85
Spills	12	200	1
Cable ops	11	297.8	5
Debris	6	17.4	1
Piracy	5	35	0
Structures	4	50.2	2
Ordnance	2	95.6	4
Restricted	1	73.3	3
Containers	1	3	0
Volcanic	0	93	3
Storms	0	62	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	37.1	2	31	1.3× / 24.8
Other · North Pacific Oceansurge	31	32.4	1	31	52× / 0.6
Icebergs · South Atlantic Ocean	29	30.1	1	32	1.6× / 18
Incidents · South China Sea	28	235.7	3	37	0.8× / 34.6
Icebergs · Southern Oceansurge	22	22	0	—	4.6× / 4.8
Surveys · South Atlantic Oceansurge	21	252.4	10	272	3.6× / 5.8
Quakes · South Pacific Ocean	18	51.2	0	—	1.9× / 9.4
Incidents · North Pacific Ocean	15	130	5	44	0.7× / 23
Exercises · North Pacific Ocean	14	140.5	3	35	1.0× / 13.4
Exercises · Bay of Bengal	14	104	1	33	1.7× / 8.4
Exercises · Mediterranean Sea - Eastern Basinsurge	12	154.5	4	60	2.2× / 5.4
Nav aids · North Sea	11	225.2	5	54	1.0× / 11.2
Surveys · Mediterranean Sea - Eastern Basinsurge	11	144.5	4	206	3.7× / 3
Exercises · Arabian Sea	11	110.6	3	34	1.8× / 6.2
Missiles · North Atlantic Ocean	11	78.5	2	59	1.3× / 8.2
Quakes · North Pacific Ocean	11	27.9	1	11	1.7× / 6.6
Exercises · Aegean Sealong running	10	337.4	10	369	1.5× / 6.8
Incidents · North Atlantic Ocean	9	175.2	4	112	0.4× / 21
Missiles · North Pacific Ocean	9	80.6	1	290	1.9× / 4.8
Nav aids · Coral Seasurge	9	54.7	4	26	3.0× / 3
Exercises · Black Sea	8	93.5	0	—	1.5× / 5.2
Exercises · South Atlantic Ocean	8	70.5	0	—	0.8× / 9.6
Missiles · South Pacific Oceansurge	8	26.2	0	—	4.0× / 2
Surveys · Arabian Sea	7	252.4	8	144	1.6× / 4.4
Spills · Gulf of Mexico	6	108	1	44	1.8× / 3.4
Nav aids · North Pacific Ocean	6	100.3	5	170	1.1× / 5.4
Derelicts · North Atlantic Ocean	6	45.4	1	50	1.5× / 4
Missiles · South Atlantic Oceansurge	6	19.2	0	—	15× / 0.4
Nav aids · South Atlantic Ocean	5	615.6	18	152	0.8× / 6.4
Incidents · Caribbean Sea	5	87.8	2	34	0.7× / 7.4
Incidents · Coral Sea	5	0.6	0	—	1.3× / 4
Missiles · Black Seasurge	4	113.6	0	—	4.0× / 1
Exercises · North Atlantic Ocean	4	70.4	1	117	0.6× / 6.8
Incidents · South Atlantic Ocean	4	39.1	1	40	0.5× / 7.8
Derelicts · South Pacific Ocean	4	38.6	2	61	1.5× / 2.6
Piracy · Gulf of Guineasurge	4	28	0	—	2.9× / 1.4
Exercises · Yellow Sea	4	27.1	1	31	0.4× / 10.4
Exercises · Philippine Sea	4	20.7	1	31	1.5× / 2.6
Structures · South Atlantic Oceansurge	4	19.2	1	27	10× / 0.4
Incidents · Mediterranean Sea - Eastern Basin	4	17.9	2	31	0.2× / 24
Missiles · Norwegian Seanew	4	16.8	1	31	new / 0
Exercises · South China Seasurge	4	14	3	20	2.0× / 2
Incidents · Bismarck Seasurge	4	4.8	1	7	3.3× / 1.2
Nav aids · Gulf of Mexicolong running	3	365.9	12	696	1.4× / 2.2
Nav aids · North Atlantic Oceanlong running	3	244	8	466	0.4× / 7.2
Nav aids · South Pacific Ocean	3	131.8	6	147	1.9× / 1.6
Nav aids · Bass Straitsurge	3	65.7	2	44	2.1× / 1.4
Nav aids · Inner Seas off the West Coast of Scotland	3	50.4	2	43	0.6× / 4.8
Spills · North Atlantic Ocean	3	50	0	—	1.7× / 1.8
Nav aids · Celtic Sea	3	35.8	1	43	1.5× / 2
Wrecks · Arabian Seasurge	3	31.6	3	16	15× / 0.2
Incidents · Indian Ocean	3	25	2	38	0.9× / 3.4
Incidents · Laccadive Sea	3	20.3	0	—	1.4× / 2.2
Incidents · Java Sea	3	19.7	1	29	1.5× / 2
Nav aids · Great Australian Bight	3	14.3	1	29	1.7× / 1.8
Nav aids · Irish Sea and St. George's Channel	3	14.3	0	—	1.0× / 3
Exercises · South Pacific Ocean	3	9.1	0	—	0.8× / 4
Quakes · Solomon Sea	3	9	0	—	0.5× / 5.8
Cable ops · Tasman Seasurge	3	8.8	0	—	3.0× / 1
Derelicts · South China Sea	3	7.9	0	—	0.6× / 4.8
Derelicts · Laccadive Seasurge	3	6.7	0	—	3.0× / 1
Derelicts · Caribbean Sea	3	6.4	1	17	1.4× / 2.2
Surveys · Persian Gulf	2	102.9	5	96	2.5× / 0.8
Exercises · Ionian Sealong running	2	99.5	5	369	2.5× / 0.8
Ordnance · North Sea	2	64.6	3	40	3.3× / 0.6
Nav aids · English Channel	2	63.5	2	91	0.9× / 2.2
Wrecks · Persian Gulf	2	53.6	3	41	10× / 0.2
Wrecks · Mediterranean Sea - Western Basinnew	2	48.3	2	27	new / 0
Surveys · Black Sea	2	43.6	3	89	1.4× / 1.4
Surveys · Bay of Biscaynew	2	42.3	1	53	new / 0
Incidents · Gulf of Mexico	2	39	0	—	1.0× / 2
Incidents · Eastern China Sea	2	32.3	1	26	2.5× / 0.8
Surveys · Barentsz Seanew	2	31.3	0	—	new / 0
Exercises · Laccadive Sea	2	31	1	31	1.7× / 1.2
Cable ops · Mediterranean Sea - Western Basin	2	30.5	0	—	5.0× / 0.4
Incidents · Gulf of Thailand	2	29.9	1	28	1.4× / 1.4
Nav aids · Laccadive Sea	2	29.9	1	28	5.0× / 0.4
Surveys · Bass Straitnew	2	25.8	1	24	new / 0
Missiles · Indian Ocean	2	21.1	0	—	0.5× / 4
Cable ops · Philippine Sea	2	10.5	0	—	10× / 0.2
Exercises · Sea of Azovnew	2	8.3	0	—	new / 0
Quakes · Banda Sea	2	6	0	—	1.3× / 1.6
Quakes · Coral Sea	2	6	0	—	10× / 0.2
Debris · North Atlantic Ocean	2	6	0	—	0.6× / 3.2
Other · North Sea	2	6	0	—	0.8× / 2.6
Derelicts · Philippine Sea	2	6	0	—	1.4× / 1.4
Derelicts · South Atlantic Ocean	2	6	0	—	0.6× / 3.2
Quakes · South Atlantic Ocean	2	6	0	—	1.4× / 1.4
Derelicts · Bay of Bengal	2	5.1	1	14	1.4× / 1.4
Surveys · Indian Ocean	2	5.1	1	56	1.7× / 1.2
Quakes · Philippine Sea	2	2.9	1	2	2.0× / 1
Other · North Atlantic Ocean	2	1.7	0	—	1.0× / 2
Incidents · Tasman Sea	2	0.3	0	—	1.3× / 1.6
Incidents · South Pacific Ocean	2	0.1	0	—	0.3× / 6.6
Wrecks · Caribbean Sealong running	1	685.1	23	714	1.7× / 0.6
Nav aids · Caribbean Sealong running	1	445.2	11	476	0.4× / 2.8
Surveys · North Atlantic Oceanlong running	1	253.1	8	410	0.5× / 2
Wrecks · North Atlantic Oceanlong running	1	214.1	7	700	new / 0
Wrecks · North Sealong running	1	155	5	598	2.5× / 0.4
Wrecks · South China Sea	1	135.4	5	123	5.0× / 0.2
Nav aids · Arabian Sea	1	95	3	143	1.3× / 0.8
Wrecks · South Pacific Ocean	1	87.8	3	87	5.0× / 0.2
Nav aids · Mediterranean Sea - Eastern Basinlong running	1	64.9	3	453	5.0× / 0.2
Surveys · Sea of Okhotsk	1	44.6	2	85	5.0× / 0.2
Cable ops · North Sea	1	37.9	1	35	1.3× / 0.8
Missiles · Aegean Sealong running	1	34.3	2	369	5.0× / 0.2
Wrecks · Mediterranean Sea - Eastern Basinlong running	1	34.2	2	432	5.0× / 0.2
Derelicts · Indian Ocean	1	34	1	45	0.3× / 3.4
Incidents · Philippine Sea	1	31.2	1	98	0.2× / 5.6
Surveys · Philippine Sea	1	31	1	66	new / 0
Surveys · Andaman or Burma Sea	1	26.5	1	26	2.5× / 0.4
Nav aids · Kara Sea	1	25.4	1	25	5.0× / 0.2
Surveys · Bay of Bengal	1	24	1	47	0.6× / 1.6
Missiles · Japan Sea	1	20.7	0	—	new / 0
Incidents · Adriatic Sea	1	20.3	0	—	1.3× / 0.8
Incidents · Arabian Sea	1	18	1	35	0.7× / 1.4
Incidents · Persian Gulf	1	16.3	0	—	2.5× / 0.4
Incidents · Solomon Sea	1	14.3	1	14	2.5× / 0.4
Spills · Gulf of Alaska	1	14	0	—	new / 0
Spills · North Pacific Ocean	1	14	0	—	0.6× / 1.6
Spills · South Pacific Ocean	1	14	0	—	new / 0
Restricted · North Sea	1	11.3	1	11	new / 0
Surveys · Malacca Strait	1	9.6	1	9	new / 0
Exercises · Indian Ocean	1	8.5	1	31	0.3× / 3
Cable ops · Eastern China Sea	1	8.1	0	—	1.0× / 1
Missiles · Davis Strait	1	7.4	0	—	new / 0
Cable ops · Java Sea	1	7.4	0	—	5.0× / 0.2
Piracy · Java Sea	1	7	0	—	new / 0
Missiles · Barentsz Sea	1	6.8	0	—	0.2× / 5
Other · Davis Strait	1	6	1	5	1.3× / 0.8
Missiles · Arctic Ocean	1	5.9	0	—	1.7× / 0.6
Exercises · Baltic Sea	1	5	0	—	0.8× / 1.2
Quakes · Indian Ocean	1	4.8	0	—	0.4× / 2.4
Exercises · Andaman or Burma Sea	1	3.9	0	—	1.7× / 0.6
Other · Celtic Sea	1	3.3	0	—	5.0× / 0.2
Derelicts · Arabian Sea	1	3	0	—	2.5× / 0.4
Quakes · Bali Sea	1	3	0	—	new / 0
Debris · Baltic Sea	1	3	0	—	new / 0
Derelicts · Bass Strait	1	3	0	—	new / 0
Other · Japan Sea	1	3	0	—	new / 0
Quakes · Molukka Sea	1	3	0	—	1.0× / 1
Containers · North Atlantic Ocean	1	3	0	—	0.7× / 1.4
Quakes · North Atlantic Ocean	1	3	0	—	new / 0
Debris · North Pacific Ocean	1	3	0	—	1.0× / 1
Debris · South Atlantic Ocean	1	3	0	—	5.0× / 0.2
Debris · Caribbean Sea	1	2.4	1	2	5.0× / 0.2
Nav aids · Bay of Bengal	1	2	0	—	1.7× / 0.6
Incidents · Bay of Bengal	1	1.9	0	—	1.3× / 0.8
Exercises · Bering Sea	1	1.9	0	—	2.5× / 0.4
Exercises · Caribbean Sea	1	1.4	0	—	2.5× / 0.4
Cable ops · Balearic (Iberian Sea)	1	1.3	1	1	2.5× / 0.4
Derelicts · Great Australian Bight	1	0.6	1	0	new / 0
Nav aids · The Coastal Waters of Southeast Alaska and British Columbia	1	0.2	0	—	0.6× / 1.8
Incidents · Bass Strait	1	0.1	0	—	5.0× / 0.2
Other · Mediterranean Sea - Eastern Basin	1	0.1	0	—	5.0× / 0.2
Incidents · Timor Sea	1	0.1	0	—	0.4× / 2.8
Nav aids · Davis Strait	1	0	0	—	1.7× / 0.6
Incidents · Southern Ocean	1	0	0	—	5.0× / 0.2
Surveys · Arctic Oceanlong running	0	193.7	6	1,623	— / 0
Surveys · The Northwestern Passageslong running	0	186	6	514	— / 0
Surveys · Beaufort Sealong running	0	155	5	2,284	— / 0
Wrecks · North Pacific Oceanlong running	0	155	5	563	— / 0
Other · Caribbean Sealong running	0	124	4	710	0.0× / 0.8
Wrecks · Gulf of Mexicolong running	0	124	4	655	— / 0
Wrecks · Hudson Strait	0	124	4	86	— / 0
Other · South China Sea	0	124	4	280	0.0× / 1.2
Wrecks · The Northwestern Passageslong running	0	124	4	492	0.0× / 0.2
Surveys · Bering Sealong running	0	93	3	538	— / 0
Wrecks · East Siberian Sea	0	93	3	178	— / 0
Wrecks · English Channel	0	89.9	2	305	0.0× / 1
Cable ops · Mediterranean Sea - Eastern Basin	0	87	2	96	0.0× / 1.4
Wrecks · Bay of Bengal	0	62	2	132	— / 0
Storms · Caribbean Sealong running	0	62	2	475	— / 0
Volcanic · Caribbean Sea	0	62	2	293	— / 0
Wrecks · Gulf of Guinea	0	62	2	154	— / 0
Nav aids · Indian Oceanlong running	0	62	2	499	0.0× / 1.6
Nav aids · South China Sea	0	62	2	64	0.0× / 0.2
Nav aids · Strait of Gibraltar	0	38.7	1	228	0.0× / 0.4
Surveys · Tasman Sea	0	32.5	1	121	0.0× / 0.2
Cable ops · North Atlantic Ocean	0	31.6	0	—	0.0× / 1.8
Surveys · Adriatic Sea	0	31	1	59	0.0× / 1.2
Nav aids · Aegean Sea	0	31	1	162	— / 0
Nav aids · Alboran Sea	0	31	1	134	— / 0
Nav aids · Andaman or Burma Sea	0	31	1	157	0.0× / 0.6
Wrecks · Bristol Channel	0	31	1	221	— / 0
Restricted · Caribbean Sealong running	0	31	1	573	— / 0
Surveys · Caribbean Sealong running	0	31	1	718	0.0× / 0.2
Wrecks · Celtic Sealong running	0	31	1	439	— / 0
Other · English Channel	0	31	1	156	0.0× / 0.4
Nav aids · Gulf of Alaska	0	31	1	135	0.0× / 0.8
Wrecks · Gulf of California	0	31	1	76	0.0× / 0.2
Other · Gulf of Thailand	0	31	1	292	— / 0
Other · Hudson Strait	0	31	1	86	— / 0
Wrecks · Indian Ocean	0	31	1	256	— / 0
Other · Inner Seas off the West Coast of Scotland	0	31	1	293	— / 0
Nav aids · Mediterranean Sea - Western Basin	0	31	1	54	0.0× / 0.8
Nav aids · Mozambique Channel	0	31	1	299	— / 0
Volcanic · Philippine Sea	0	31	1	110	0.0× / 0.8
Ordnance · Sea of Azov	0	31	1	130	0.0× / 0.6
Cable ops · Sea of Okhotsk	0	31	1	94	— / 0

Cite: seahazards.com Sea Ledger, 2018-12, 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.