Sea Ledger, April 2019

2019-04-01 to 2019-04-30 · archive

issued: 649
warning-days in force: 9,461
in force at month end: 328
sea × type cells: 224

baseline: same month, previous 5 years (2018-04, 2017-04, 2016-04, 2015-04, 2014-04)

By type

type	issued	warning-days	in force at end
Exercises	121	1,162.3	36
Icebergs	87	97.1	5
Surveys	85	1,605.7	59
Incidents	84	664.5	21
Nav aids	60	2,481.1	85
Other	43	407	14
Derelicts	36	126.5	3
Missiles	32	375	13
Quakes	32	103.4	2
Spills	18	221	8
Wrecks	16	1,692.9	63
Debris	14	48.9	2
Cable ops	14	315.2	11
Ordnance	2	3.4	1
Piracy	2	19.9	0
Towing	1	0.8	0
Restricted	1	73.4	3
Containers	1	3	0
Structures	0	60	2

By sea and type · 200 cells, most issued first

cell	issued	warning-days	at end	longest d	vs 5 y
Other · North Atlantic Oceansurge	31	48.1	1	35	155× / 0.2
Icebergs · South Atlantic Oceansurge	30	28.8	1	29	3.3× / 9.2
Surveys · South Atlantic Oceansurgelong running	27	313.7	13	392	2.4× / 11.4
Exercises · Mediterranean Sea - Eastern Basinsurge	26	169.8	5	180	6.8× / 3.8
Icebergs · Southern Ocean	25	25.6	1	30	1.9× / 12.8
Incidents · South China Sea	22	199.2	6	45	1.1× / 20.8
Exercises · North Pacific Ocean	17	158.1	6	63	0.9× / 19.4
Icebergs · North Atlantic Ocean	17	20.1	0	—	0.9× / 19
Incidents · North Pacific Ocean	15	133.7	4	32	0.5× / 28.8
Exercises · Arabian Seasurge	15	82.2	2	34	2.2× / 6.8
Nav aids · South Atlantic Ocean	12	664.3	25	190	1.4× / 8.4
Icebergs · Labrador Sea	12	14.2	2	31	1.1× / 10.4
Exercises · Aegean Seasurge	11	208.7	7	123	5.0× / 2.2
Surveys · North Atlantic Oceansurgelong running	10	207.8	10	530	2.1× / 4.8
Surveys · Persian Gulfsurge	10	150.6	7	216	17× / 0.6
Spills · Gulf of Mexico	10	126	3	43	1.8× / 5.6
Missiles · North Atlantic Ocean	10	55.7	3	33	1.4× / 7
Exercises · Black Sea	9	129.5	1	63	0.7× / 12.2
Surveys · Mediterranean Sea - Eastern Basinsurge	9	109.9	6	96	3.5× / 2.6
Incidents · South Atlantic Ocean	9	61.6	2	29	1.3× / 6.8
Exercises · Bay of Bengal	8	79.2	4	33	0.8× / 9.6
Quakes · South Pacific Ocean	8	31.3	0	—	0.6× / 13.6
Exercises · Philippine Seasurge	8	16.4	3	15	3.1× / 2.6
Nav aids · North Sea	7	239.4	6	96	0.7× / 9.6
Nav aids · Coral Sea	7	41.7	1	31	0.9× / 8
Derelicts · North Atlantic Oceansurge	7	25.5	0	—	2.7× / 2.6
Debris · Indian Oceansurge	6	16.6	1	31	15× / 0.4
Derelicts · Bay of Bengalsurge	6	10.9	0	—	7.5× / 0.8
Nav aids · Gulf of Mexicosurge	5	149.8	5	183	2.1× / 2.4
Surveys · Arabian Sea	5	112.5	4	81	0.9× / 5.4
Spills · North Pacific Oceansurge	5	55	3	21	3.1× / 1.6
Quakes · Philippine Sea	5	15	0	—	1.8× / 2.8
Derelicts · Coral Seasurge	5	13.2	0	—	25× / 0.2
Incidents · Indian Ocean	5	12.6	1	32	1.1× / 4.6
Wrecks · Arabian Seasurge	4	109.7	5	92	6.7× / 0.6
Surveys · South China Seasurge	4	63.9	2	30	4.0× / 1
Wrecks · South Atlantic Oceansurge	4	58.9	2	42	20× / 0.2
Cable ops · North Atlantic Ocean	4	42	0	—	0.8× / 5.2
Derelicts · South Pacific Oceansurge	4	41.8	1	61	2.2× / 1.8
Surveys · Sea of Marmaranew	4	30.2	2	43	new / 0
Exercises · Barentsz Seasurge	4	22.9	0	—	10× / 0.4
Exercises · South Pacific Ocean	4	19.4	0	—	0.6× / 6.6
Quakes · South Atlantic Oceansurge	4	12	0	—	3.3× / 1.2
Derelicts · Indian Ocean	4	9.2	1	29	1.2× / 3.4
Missiles · Indian Oceansurge	4	6.2	2	5	2.9× / 1.4
Incidents · Coral Sea	4	5.7	1	21	0.8× / 5.2
Missiles · Black Sea	3	124.6	2	32	0.9× / 3.2
Nav aids · Indian Oceansurge	3	58.8	2	35	3.0× / 1
Incidents · North Atlantic Ocean	3	52.2	1	33	0.2× / 15.4
Missiles · Japan Sea	3	30.8	1	34	1.3× / 2.4
Nav aids · Inner Seas off the West Coast of Scotland	3	22.9	0	—	0.8× / 3.8
Incidents · Caribbean Sea	3	20	1	27	0.8× / 3.8
Missiles · Barentsz Sea	3	19.6	0	—	0.7× / 4.2
Exercises · Andaman or Burma Seasurge	3	18.6	1	8	2.1× / 1.4
Exercises · Yellow Sea	3	12.3	0	—	0.3× / 10.6
Incidents · South Pacific Ocean	3	9.7	0	—	0.3× / 9.2
Quakes · Banda Seasurge	3	9	0	—	5.0× / 0.6
Quakes · North Pacific Ocean	3	9	0	—	0.6× / 5.4
Derelicts · North Pacific Oceansurge	3	8	1	18	3.0× / 1
Surveys · Great Australian Bightnew	3	5.7	0	—	new / 0
Nav aids · Arafura Seasurge	3	3.1	0	—	7.5× / 0.4
Wrecks · South China Sea	2	280.9	11	113	2.0× / 1
Nav aids · North Atlantic Ocean	2	240.9	8	173	0.3× / 6.2
Nav aids · North Pacific Ocean	2	97.4	4	290	0.9× / 2.2
Nav aids · South Pacific Ocean	2	91.6	4	176	0.8× / 2.6
Surveys · Black Sea	2	74.1	2	120	1.7× / 1.2
Other · Arabian Sea	2	54.8	3	93	5.0× / 0.4
Cable ops · Persian Gulfnew	2	54.2	2	56	new / 0
Missiles · North Pacific Oceanlong running	2	50.9	1	410	0.5× / 4
Incidents · Arabian Sea	2	49.7	1	45	1.0× / 2
Nav aids · Gulf of Alaska	2	44.9	3	47	3.3× / 0.6
Nav aids · Andaman or Burma Sea	2	44	2	151	2.0× / 1
Wrecks · English Channelnew	2	38	2	42	new / 0
Other · Indian Ocean	2	33.4	1	31	3.3× / 0.6
Incidents · Mediterranean Sea - Eastern Basin	2	33	1	42	0.1× / 20.4
Exercises · Laccadive Sea	2	32.7	1	33	1.3× / 1.6
Wrecks · Indian Ocean	2	32.3	3	35	10× / 0.2
Nav aids · English Channel	2	31.1	0	—	0.8× / 2.6
Cable ops · North Pacific Ocean	2	27.7	1	26	10× / 0.2
Cable ops · Bay of Bengal	2	24.8	2	20	10× / 0.2
Cable ops · South China Sea	2	23.5	2	31	0.7× / 3
Incidents · Gulf of Thailand	2	21.9	0	—	1.4× / 1.4
Missiles · Arabian Sea	2	13.4	0	—	3.3× / 0.6
Spills · Gulf of Alaska	2	12	2	6	3.3× / 0.6
Exercises · Sulu Seanew	2	8.5	1	18	new / 0
Incidents · Banda Sea	2	8.3	0	—	10× / 0.2
Quakes · Solomon Sea	2	7.5	0	—	0.5× / 4
Exercises · South China Sea	2	7.4	0	—	0.7× / 2.8
Quakes · Indian Ocean	2	7.3	0	—	0.8× / 2.4
Icebergs · Kara Sea	2	6	0	—	10× / 0.2
Exercises · Red Sea	2	4.3	0	—	10× / 0.2
Missiles · South Pacific Ocean	2	4.1	2	2	0.8× / 2.4
Incidents · Solomon Sea	2	2.7	1	8	3.3× / 0.6
Other · North Sea	2	1.5	0	—	1.4× / 1.4
Nav aids · Caribbean Sealong running	1	304.8	11	448	2.5× / 0.4
Other · Caribbean Sealong running	1	147.2	5	830	1.7× / 0.6
Exercises · Ionian Sea	1	66	2	123	5.0× / 0.2
Exercises · North Atlantic Ocean	1	60.6	2	54	0.2× / 4.4
Surveys · Andaman or Burma Sea	1	59.9	1	81	2.5× / 0.4
Wrecks · North Pacific Oceanlong running	1	56.2	2	683	1.7× / 0.6
Surveys · Mediterranean Sea - Western Basin	1	54.9	1	48	1.0× / 1
Surveys · Bay of Bengal	1	54.8	0	—	0.5× / 2.2
Wrecks · South Pacific Ocean	1	36.9	2	145	5.0× / 0.2
Surveys · Bering Sealong running	1	34.5	1	658	new / 0
Nav aids · Aegean Sea	1	28.4	1	28	5.0× / 0.2
Nav aids · Arabian Sea	1	28.4	1	28	0.6× / 1.6
Surveys · Gulf of Aden	1	27.1	1	57	new / 0
Nav aids · Persian Gulf	1	27.1	1	37	5.0× / 0.2
Surveys · Red Sea	1	27.1	1	78	new / 0
Cable ops · Sulu Sea	1	26	0	—	new / 0
Surveys · North Pacific Ocean	1	21.4	1	21	new / 0
Surveys · Indian Ocean	1	17	1	16	0.6× / 1.6
Cable ops · South Pacific Ocean	1	16.6	1	55	1.7× / 0.6
Incidents · Celtic Sea	1	16.5	0	—	5.0× / 0.2
Nav aids · Laccadive Sea	1	15	1	145	0.7× / 1.4
Nav aids · Bay of Bengal	1	14.5	0	—	1.3× / 0.8
Spills · Caribbean Sea	1	14	0	—	new / 0
Incidents · Timor Sea	1	14	0	—	5.0× / 0.2
Restricted · Persian Gulf	1	13.4	1	13	5.0× / 0.2
Piracy · Gulf of Guinea	1	12.9	0	—	0.2× / 4.4
Incidents · Eastern China Sea	1	12.7	1	41	1.3× / 0.8
Surveys · Aegean Sea	1	7.6	0	—	0.6× / 1.6
Piracy · Indian Ocean	1	7	0	—	2.5× / 0.4
Exercises · Indian Ocean	1	6.8	0	—	0.6× / 1.8
Exercises · South Atlantic Ocean	1	5.9	0	—	0.2× / 5
Other · Black Sea	1	5.3	0	—	new / 0
Missiles · Laccadive Sea	1	5.1	0	—	0.8× / 1.2
Missiles · Norwegian Sea	1	5.1	0	—	new / 0
Missiles · Philippine Sea	1	4.6	1	4	new / 0
Derelicts · Arabian Sea	1	3.9	0	—	new / 0
Incidents · Philippine Sea	1	3.7	1	3	0.2× / 4.4
Quakes · Andaman or Burma Sea	1	3	0	—	new / 0
Quakes · Bering Sea	1	3	0	—	2.5× / 0.4
Exercises · Caribbean Sea	1	3	0	—	0.7× / 1.4
Debris · Coral Sea	1	3	0	—	2.5× / 0.4
Other · Coral Sea	1	3	0	—	5.0× / 0.2
Other · English Channel	1	3	0	—	1.7× / 0.6
Derelicts · Japan Sea	1	3	0	—	5.0× / 0.2
Debris · Mediterranean Sea - Eastern Basin	1	3	0	—	1.7× / 0.6
Derelicts · Mediterranean Sea - Eastern Basin	1	3	0	—	0.8× / 1.2
Debris · Mediterranean Sea - Western Basin	1	3	0	—	new / 0
Derelicts · Mediterranean Sea - Western Basin	1	3	0	—	5.0× / 0.2
Containers · North Atlantic Ocean	1	3	0	—	5.0× / 0.2
Debris · North Pacific Ocean	1	3	0	—	2.5× / 0.4
Debris · Red Sea	1	3	0	—	new / 0
Derelicts · South Atlantic Ocean	1	3	0	—	0.6× / 1.6
Ordnance · South Atlantic Ocean	1	3	0	—	new / 0
Quakes · South China Sea	1	3	0	—	new / 0
Debris · Timor Sea	1	3	0	—	2.5× / 0.4
Surveys · Alboran Sea	1	2.5	0	—	new / 0
Icebergs · Barentsz Sea	1	2.4	1	2	new / 0
Quakes · North Atlantic Ocean	1	1.9	1	1	2.5× / 0.4
Debris · Gulf of Mexico	1	1.7	0	—	new / 0
Surveys · Norwegian Sea	1	1.6	1	1	0.7× / 1.4
Derelicts · South China Sea	1	1.6	0	—	0.8× / 1.2
Other · Mediterranean Sea - Eastern Basin	1	1.5	1	1	0.5× / 2
Quakes · Arabian Sea	1	1.4	1	1	new / 0
Incidents · Bismarck Sea	1	1.1	0	—	1.3× / 0.8
Nav aids · Great Australian Bight	1	1	0	—	new / 0
Towing · Indian Ocean	1	0.8	0	—	new / 0
Incidents · Halmahera Sea	1	0.7	0	—	new / 0
Incidents · Molukka Sea	1	0.6	0	—	new / 0
Other · South Pacific Ocean	1	0.6	0	—	5.0× / 0.2
Ordnance · Black Sea	1	0.4	1	0	new / 0
Debris · North Atlantic Ocean	1	0.3	1	0	0.7× / 1.4
Incidents · Bay of Bengal	1	0.2	0	—	1.7× / 0.6
Incidents · Ceram Sea	1	0.2	0	—	new / 0
Derelicts · English Channel	1	0.1	0	—	1.0× / 1
Nav aids · Strait of Gibraltar	1	0.1	0	—	2.5× / 0.4
Incidents · Java Sea	1	0	0	—	1.7× / 0.6
Wrecks · Caribbean Sealong running	0	390	13	823	0.0× / 0.8
Wrecks · North Atlantic Oceanlong running	0	150	5	820	0.0× / 0.4
Wrecks · Gulf of Mexicolong running	0	120	4	775	0.0× / 0.2
Wrecks · North Sea	0	90	3	85	0.0× / 1.8
Nav aids · Philippine Sea	0	90	3	55	— / 0
Wrecks · Bay of Bengal	0	60	2	95	— / 0
Nav aids · Mediterranean Sea - Western Basin	0	60	2	89	0.0× / 0.6
Nav aids · Mozambique Channel	0	60	2	54	— / 0
Wrecks · The Northwestern Passages	0	60	2	236	— / 0
Other · South China Sealong running	0	48.6	1	400	0.0× / 0.8
Surveys · Sea of Okhotsk	0	33.9	1	125	— / 0
Cable ops · Adriatic Sea	0	30	1	62	— / 0
Missiles · Aegean Sea	0	30	1	123	— / 0
Exercises · Alboran Sea	0	30	1	33	0.0× / 0.4
Cable ops · Arabian Sea	0	30	1	46	0.0× / 2.4
Nav aids · Bass Strait	0	30	1	34	0.0× / 1
Surveys · Bay of Biscay	0	30	1	71	0.0× / 0.4
Restricted · Caribbean Sealong running	0	30	1	693	0.0× / 0.2
Wrecks · Gulf of California	0	30	1	196	— / 0
Surveys · Gulf of Guinea	0	30	1	106	0.0× / 0.4
Surveys · Gulf of Mexico	0	30	1	62	0.0× / 0.4
Other · Gulf of Thailandlong running	0	30	1	412	0.0× / 0.2
Other · Irish Sea and St. George's Channel	0	30	1	60	0.0× / 0.2
Wrecks · Java Sea	0	30	1	36	— / 0
Wrecks · Kara Sea	0	30	1	81	0.0× / 0.2
Wrecks · Laccadive Sea	0	30	1	57	0.0× / 0.2
Surveys · Malacca Strait	0	30	1	62	— / 0
Wrecks · Mediterranean Sea - Western Basin	0	30	1	147	— / 0
Wrecks · Philippine Sea	0	30	1	85	— / 0
Cable ops · Sea of Okhotsk	0	30	1	214	— / 0

Cite: seahazards.com Sea Ledger, 2019-04, 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.