Sea Ledger, May 2017

2017-05-01 to 2017-05-31 · archive

issued: 635
warning-days in force: 11,822
in force at month end: 413
sea × type cells: 234

baseline: same month, previous 5 years (2016-05, 2015-05, 2014-05, 2013-05, 2012-05)

By type

type	issued	warning-days	in force at end
Incidents	183	1,676.8	77
Nav aids	99	2,485	82
Exercises	84	1,330.4	39
Surveys	68	2,262.5	80
Icebergs	35	40.1	2
Missiles	32	398.6	16
Derelicts	29	112.9	4
Quakes	27	81.6	3
Spills	17	219	8
Other	15	559	19
Wrecks	13	1,617.6	53
Cable ops	11	448.4	12
Piracy	11	141	3
Debris	5	15.3	0
Ordnance	4	109.1	5
Containers	2	6	0
Restricted	0	132.6	4
Volcanic	0	155	5
Structures	0	31	1

By sea and type · 200 cells, most issued first

cell	issued	warning-days	at end	longest d	vs 5 y
Incidents · Mediterranean Sea - Eastern Basinsurge	32	404.2	22	46	2.5× / 12.6
Incidents · South China Seasurge	32	250.4	11	44	2.6× / 12.2
Incidents · North Atlantic Ocean	27	258.3	16	36	1.4× / 19.8
Icebergs · North Atlantic Ocean	25	26.9	2	25	1.8× / 14.2
Incidents · North Pacific Ocean	23	195.6	8	46	0.8× / 28.6
Exercises · North Pacific Ocean	17	161.9	8	40	0.9× / 19
Surveys · South Atlantic Oceansurge	16	155.7	6	72	3.6× / 4.4
Missiles · North Atlantic Ocean	12	153.3	9	50	1.5× / 7.8
Exercises · Black Sea	12	137.9	3	61	1.6× / 7.4
Nav aids · South Atlantic Oceansurge	11	219.4	7	209	2.2× / 5
Nav aids · North Pacific Oceansurge	11	167.8	5	224	3.9× / 2.8
Nav aids · Coral Sealong running	11	145.1	5	1,139	2.0× / 5.6
Incidents · Indian Ocean	11	57.2	3	29	1.2× / 9
Exercises · Bay of Bengal	9	133.4	3	34	1.7× / 5.2
Spills · Gulf of Mexico	9	106	5	38	2.0× / 4.6
Quakes · North Pacific Ocean	9	24.7	1	23	1.1× / 7.8
Incidents · South Pacific Ocean	9	23.7	0	—	1.0× / 8.8
Nav aids · Arabian Seasurge	8	116.4	4	91	8.0× / 1
Nav aids · North Sea	8	109.3	2	65	0.8× / 9.8
Incidents · Caribbean Seasurge	8	85.5	3	33	2.1× / 3.8
Missiles · North Pacific Ocean	8	77.9	4	60	1.1× / 7.4
Icebergs · Labrador Sea	8	10.6	0	—	0.5× / 17.4
Nav aids · Gulf of Mexico	7	166.3	6	117	1.8× / 4
Surveys · Arabian Seasurge	7	139.5	3	48	8.8× / 0.8
Nav aids · Inner Seas off the West Coast of Scotlandsurge	7	66.9	2	49	3.9× / 1.8
Derelicts · South Atlantic Oceansurge	7	9.5	0	—	18× / 0.4
Surveys · Norwegian Seanew	6	179	6	49	new / 0
Exercises · North Atlantic Ocean	6	80.6	0	—	1.8× / 3.4
Incidents · Eastern China Seasurge	6	70.9	4	30	30× / 0.2
Incidents · Philippine Sea	6	70.6	1	45	1.5× / 4
Piracy · Gulf of Adensurge	6	34.6	2	30	7.5× / 0.8
Surveys · North Atlantic Oceanlong running	5	351.8	11	722	1.6× / 3.2
Surveys · Mediterranean Sea - Eastern Basinsurge	5	94.9	3	51	2.1× / 2.4
Surveys · North Seasurge	5	59.2	3	34	6.3× / 0.8
Exercises · Arabian Sea	5	57.9	1	33	0.7× / 7.4
Nav aids · English Channelsurge	5	24.8	1	28	2.5× / 2
Exercises · South Pacific Ocean	5	19.7	1	31	0.9× / 5.6
Exercises · Mediterranean Sea - Eastern Basin	5	19.1	1	19	0.8× / 6
Derelicts · North Atlantic Ocean	5	19	1	30	1.0× / 5
Quakes · South Atlantic Oceansurge	5	13.5	1	29	2.5× / 2
Nav aids · Caribbean Seasurge	4	374.7	13	342	10× / 0.4
Exercises · Aegean Seasurge	4	351.3	11	153	2.5× / 1.6
Nav aids · South Pacific Oceansurge	4	196.6	7	278	5.0× / 0.8
Wrecks · North Seanew	4	186	6	63	new / 0
Nav aids · North Atlantic Oceanlong running	4	161.2	7	1,470	0.7× / 5.4
Incidents · Gulf of Mexico	4	90.9	2	41	0.9× / 4.6
Surveys · Gulf of Mexicosurge	4	88.2	3	92	20× / 0.2
Ordnance · North Seasurge	4	47.1	3	46	2.9× / 1.4
Exercises · South Atlantic Ocean	4	34.6	2	31	0.6× / 6.8
Exercises · Norwegian Seasurge	4	28.3	0	—	10× / 0.4
Nav aids · The Coastal Waters of Southeast Alaska and British Columbiasurge	4	22.1	0	—	2.2× / 1.8
Derelicts · Timor Seasurge	4	13.2	0	—	6.7× / 0.6
Incidents · Coral Sea	4	12.5	1	34	0.9× / 4.2
Surveys · South China Seasurge	3	110.3	4	77	7.5× / 0.4
Missiles · Black Sea	3	79	1	35	1.1× / 2.6
Exercises · Gulf of Mexicosurge	3	65.5	3	21	2.1× / 1.4
Cable ops · Eastern China Seasurge	3	49.2	1	33	7.5× / 0.4
Spills · North Pacific Ocean	3	37	1	31	0.7× / 4.4
Other · North Atlantic Ocean	3	32.2	1	27	1.1× / 2.8
Incidents · Arabian Sea	3	26.1	1	37	1.9× / 1.6
Cable ops · North Sea	3	18.7	0	—	1.0× / 3
Quakes · Philippine Sea	3	10.5	0	—	1.3× / 2.4
Quakes · South Pacific Ocean	3	10.3	0	—	0.3× / 9.8
Incidents · South Atlantic Ocean	3	6.9	0	—	0.5× / 6
Cable ops · North Atlantic Ocean	2	123.9	3	88	0.4× / 5.4
Surveys · Indian Ocean	2	83.9	3	188	2.0× / 1
Wrecks · South Pacific Oceannew	2	71.4	3	131	new / 0
Surveys · Black Sea	2	67.7	3	71	1.3× / 1.6
Wrecks · South Atlantic Oceannew	2	55	2	110	new / 0
Surveys · Celtic Sea	2	45.1	2	43	1.1× / 1.8
Other · Indian Ocean	2	37	1	33	5.0× / 0.4
Wrecks · Irish Sea and St. George's Channelnew	2	36.1	2	142	new / 0
Other · Davis Strait	2	33	2	16	10× / 0.2
Surveys · Andaman or Burma Sea	2	32.5	0	—	5.0× / 0.4
Exercises · Barentsz Sea	2	21.5	0	—	2.5× / 0.8
Missiles · Indian Ocean	2	17.1	0	—	2.0× / 1
Nav aids · Irish Sea and St. George's Channel	2	16.5	0	—	0.8× / 2.6
Nav aids · Bristol Channel	2	16.4	1	16	3.3× / 0.6
Spills · Bering Sea	2	16	1	17	10× / 0.2
Exercises · Yellow Sea	2	13.8	1	33	0.2× / 12.8
Piracy · Malacca Strait	2	12.7	1	26	10× / 0.2
Derelicts · Indian Ocean	2	12.5	1	33	0.3× / 6
Incidents · Timor Sea	2	8.7	1	8	1.7× / 1.2
Missiles · South Pacific Ocean	2	6.8	1	7	3.3× / 0.6
Quakes · Bering Sea	2	6	0	—	10× / 0.2
Debris · Norwegian Seanew	2	4.4	0	—	new / 0
Nav aids · Beaufort Seanew	2	4.3	1	4	new / 0
Derelicts · Coral Sea	2	3	0	—	2.0× / 1
Icebergs · Southern Ocean	2	2.6	0	—	1.3× / 1.6
Exercises · Coral Sea	2	2.3	0	—	1.7× / 1.2
Nav aids · Laccadive Sea	2	2.1	0	—	10× / 0.2
Incidents · Bay of Bengal	2	0.9	0	—	1.0× / 2
Wrecks · South China Sealong running	1	427.5	14	1,115	1.0× / 1
Nav aids · Arafura Sea	1	60.8	1	342	2.5× / 0.4
Wrecks · Persian Gulf	1	52.4	2	62	2.5× / 0.4
Cable ops · South Atlantic Ocean	1	43	2	76	0.1× / 17.2
Nav aids · Mediterranean Sea - Eastern Basinlong running	1	41.5	2	415	5.0× / 0.2
Spills · North Atlantic Ocean	1	41	0	—	0.4× / 2.6
Missiles · Aegean Sea	1	36.8	1	150	1.7× / 0.6
Surveys · Persian Gulf	1	36.4	2	64	5.0× / 0.2
Derelicts · South China Sea	1	34	1	131	5.0× / 0.2
Exercises · Laccadive Sea	1	33.8	1	34	0.6× / 1.8
Nav aids · Indian Oceanlong running	1	33.6	1	689	0.3× / 3
Nav aids · Bass Straitlong running	1	32	1	760	1.3× / 0.8
Other · North Sea	1	31	1	52	0.5× / 2.2
Surveys · Sea of Okhotsk	1	31	2	177	new / 0
Other · South Pacific Ocean	1	28.9	1	28	2.5× / 0.4
Piracy · Gulf of Guinea	1	28.7	0	—	0.5× / 2.2
Incidents · Mediterranean Sea - Western Basin	1	28.5	1	36	1.3× / 0.8
Surveys · Irish Sea and St. George's Channel	1	25.7	1	25	new / 0
Nav aids · Mediterranean Sea - Western Basin	1	22.2	1	22	1.0× / 1
Exercises · Caribbean Sea	1	21.8	1	21	0.6× / 1.8
Nav aids · Mozambique Channel	1	20.2	1	20	1.7× / 0.6
Wrecks · English Channel	1	19.9	1	19	5.0× / 0.2
Spills · The Coastal Waters of Southeast Alaska and British Columbia	1	18	0	—	1.3× / 0.8
Incidents · Red Sea	1	17.3	1	17	new / 0
Exercises · Kara Sea	1	16.2	0	—	new / 0
Surveys · Singapore Strait	1	15.4	1	71	new / 0
Cable ops · Japan Sea	1	14.6	0	—	5.0× / 0.2
Incidents · Laccadive Sea	1	13.6	1	13	1.0× / 1
Other · Mediterranean Sea - Eastern Basin	1	13.6	1	13	2.5× / 0.4
Surveys · Philippine Sea	1	13.3	0	—	5.0× / 0.2
Missiles · Japan Sea	1	10.9	0	—	5.0× / 0.2
Incidents · Gulf of Thailand	1	10.6	1	10	1.3× / 0.8
Surveys · Banda Sea	1	9.5	1	9	new / 0
Other · North Pacific Ocean	1	7.7	1	43	2.5× / 0.4
Piracy · Gulf of Oman	1	7	0	—	1.3× / 0.8
Cable ops · Irish Sea and St. George's Channel	1	7	0	—	5.0× / 0.2
Piracy · South China Sea	1	7	0	—	1.7× / 0.6
Exercises · Baltic Sea	1	6.9	0	—	0.4× / 2.4
Missiles · South Atlantic Ocean	1	6.5	0	—	2.5× / 0.4
Surveys · Gulf of California	1	5.9	1	5	new / 0
Missiles · Barentsz Sea	1	5.4	0	—	0.5× / 2
Missiles · Laccadive Sea	1	4.9	0	—	1.0× / 1
Incidents · Davis Strait	1	4.1	0	—	0.7× / 1.4
Quakes · Banda Sea	1	3	0	—	2.5× / 0.4
Quakes · Bismarck Sea	1	3	0	—	1.3× / 0.8
Containers · Caribbean Sea	1	3	0	—	new / 0
Derelicts · Caribbean Sea	1	3	0	—	1.7× / 0.6
Quakes · Coral Sea	1	3	0	—	0.6× / 1.6
Derelicts · Great Australian Bight	1	3	0	—	new / 0
Debris · Gulf of Mexico	1	3	0	—	new / 0
Debris · Indian Ocean	1	3	0	—	5.0× / 0.2
Derelicts · Laccadive Sea	1	3	0	—	2.5× / 0.4
Derelicts · Mediterranean Sea - Western Basin	1	3	0	—	5.0× / 0.2
Debris · North Pacific Ocean	1	3	0	—	1.0× / 1
Derelicts · North Pacific Ocean	1	3	0	—	0.7× / 1.4
Containers · Norwegian Sea	1	3	0	—	new / 0
Derelicts · South Pacific Ocean	1	3	0	—	0.5× / 2.2
Quakes · Southern Ocean	1	3	0	—	2.5× / 0.4
Derelicts · Tasman Sea	1	3	0	—	1.3× / 0.8
Surveys · North Pacific Ocean	1	2.5	1	2	5.0× / 0.2
Incidents · Banda Sea	1	2.4	0	—	5.0× / 0.2
Quakes · Gulf of Tomini	1	2.4	1	2	new / 0
Other · Java Sea	1	2.4	0	—	new / 0
Other · Tasman Sea	1	1.8	0	—	1.0× / 1
Spills · Caribbean Sea	1	1	1	1	5.0× / 0.2
Nav aids · Gulf of Alaska	1	0.9	0	—	1.3× / 0.8
Incidents · Mozambique Channel	1	0.3	0	—	0.6× / 1.6
Incidents · Bass Strait	1	0.2	0	—	new / 0
Incidents · Malacca Strait	1	0.2	0	—	5.0× / 0.2
Derelicts · Mozambique Channel	1	0.2	1	0	5.0× / 0.2
Other · English Channel	1	0.1	0	—	5.0× / 0.2
Incidents · Great Australian Bight	1	0.1	0	—	2.5× / 0.4
Other · Gulf of Aden	1	0.1	0	—	new / 0
Incidents · Gulf of Oman	1	0	0	—	new / 0
Surveys · Japan Sea	1	0	1	0	2.5× / 0.4
Wrecks · Caribbean Sea	0	340.8	10	319	— / 0
Surveys · Arctic Oceanlong running	0	217	7	1,044	— / 0
Surveys · Beaufort Sealong running	0	124	4	1,705	— / 0
Other · Caribbean Sea	0	124	4	131	— / 0
Surveys · Bay of Bengal	0	93	3	327	0.0× / 0.6
Surveys · Bering Sea	0	93	3	325	— / 0
Other · Coral Sealong running	0	93	3	777	0.0× / 0.4
Exercises · Ionian Sea	0	93	3	150	— / 0
Volcanic · Philippine Sealong running	0	93	3	1,858	0.0× / 0.4
Nav aids · Tasman Sealong running	0	93	3	365	0.0× / 0.6
Wrecks · Arabian Sealong running	0	87.5	2	1,158	0.0× / 0.2
Ordnance · Black Sea	0	62	2	350	0.0× / 0.2
Nav aids · Malacca Straitlong running	0	62	2	583	0.0× / 0.2
Wrecks · North Pacific Ocean	0	62	2	210	— / 0
Cable ops · Persian Gulf	0	62	2	169	0.0× / 0.8
Nav aids · Persian Gulf	0	62	2	301	0.0× / 0.2
Other · Sea of Azov	0	62	2	306	0.0× / 0.2
Other · South China Sealong running	0	62	2	917	0.0× / 0.8
Surveys · The Northwestern Passageslong running	0	62	2	1,759	— / 0
Piracy · Indian Ocean	0	51	0	—	0.0× / 0.2
Surveys · Caribbean Sea	0	33	1	139	— / 0
Nav aids · Bay of Bengal	0	32.9	1	162	0.0× / 0.6
Nav aids · Andaman or Burma Sea	0	31	1	86	0.0× / 0.4
Wrecks · Andaman or Burma Sea	0	31	1	145	— / 0
Restricted · Baltic Sea	0	31	1	258	— / 0
Restricted · Black Sealong running	0	31	1	1,456	— / 0
Wrecks · Black Sea	0	31	1	230	— / 0
Cable ops · Caribbean Sea	0	31	1	166	0.0× / 0.2
Volcanic · Caribbean Sea	0	31	1	31	— / 0
Nav aids · Celtic Sea	0	31	1	49	0.0× / 0.6
Surveys · Chukchi Sea	0	31	1	265	— / 0
Nav aids · Great Australian Bightlong running	0	31	1	546	0.0× / 0.4
Nav aids · Gulf of California	0	31	1	77	0.0× / 0.2

Cite: seahazards.com Sea Ledger, 2017-05, 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.