Sea Ledger, July 2017

2017-07-01 to 2017-07-31 · archive

issued: 603
warning-days in force: 12,287
in force at month end: 391
sea × type cells: 246

baseline: same month, previous 5 years (2016-07, 2015-07, 2014-07, 2013-07, 2012-07)

By type

type	issued	warning-days	in force at end
Incidents	158	1,855.2	41
Exercises	107	1,059.9	37
Surveys	75	2,328.5	83
Nav aids	70	2,893.8	104
Icebergs	35	46.3	4
Quakes	32	100.2	1
Other	31	637.8	23
Missiles	23	325.6	5
Derelicts	15	98.2	3
Wrecks	12	1,816.7	59
Spills	11	192	2
Cable ops	11	347.7	10
Debris	8	21.8	0
Piracy	7	50.3	3
Containers	4	13.4	0
Ordnance	2	151.6	4
Mines	1	2.2	1
Restricted	1	159.4	5
Structures	0	31	1
Volcanic	0	155	5

By sea and type · 200 cells, most issued first

cell	issued	warning-days	at end	longest d	vs 5 y
Icebergs · Labrador Sea	28	33.6	2	32	1.5× / 18.6
Incidents · North Pacific Ocean	27	341.6	8	44	1.0× / 26.8
Incidents · South China Sea	26	254.3	6	42	1.4× / 19.2
Exercises · Black Seasurge	26	144.6	3	62	2.0× / 12.8
Incidents · North Atlantic Ocean	16	163	8	39	1.0× / 15.4
Exercises · North Pacific Ocean	14	104.1	8	65	0.8× / 17.6
Nav aids · North Sea	13	166	9	66	1.3× / 10
Exercises · South Atlantic Oceansurge	13	54.1	0	—	2.6× / 5
Incidents · Mediterranean Sea - Eastern Basin	12	316.4	3	44	0.7× / 17.4
Quakes · South Pacific Ocean	12	42.5	0	—	1.1× / 10.8
Nav aids · South Pacific Oceansurge	10	268	10	329	6.3× / 1.6
Other · North Seasurge	10	36.1	4	71	8.3× / 1.2
Incidents · South Atlantic Oceansurge	10	28.4	1	34	2.0× / 5
Surveys · Norwegian Seanew	9	366.2	13	108	new / 0
Surveys · South Atlantic Ocean	9	138.3	4	103	1.6× / 5.6
Incidents · Gulf of Mexico	9	130.3	3	33	2.0× / 4.6
Exercises · North Atlantic Oceansurge	9	27.3	0	—	3.2× / 2.8
Missiles · Black Seasurge	8	151.6	2	31	13× / 0.6
Incidents · Philippine Seasurge	8	96.3	1	32	2.2× / 3.6
Nav aids · Inner Seas off the West Coast of Scotlandsurge	8	76.8	3	68	2.9× / 2.8
Exercises · Mediterranean Sea - Eastern Basin	8	21	0	—	1.1× / 7.2
Surveys · North Atlantic Oceansurgelong running	7	286.8	9	783	2.9× / 2.4
Exercises · Bay of Bengal	7	50.4	2	31	1.8× / 3.8
Incidents · South Pacific Ocean	7	2.2	0	—	0.8× / 8.2
Surveys · South China Seasurge	6	78.6	2	121	6.0× / 1
Nav aids · Caribbean Seasurgelong running	5	458.8	17	403	2.5× / 2
Nav aids · South Atlantic Ocean	5	233.1	8	201	0.8× / 6.2
Wrecks · North Seasurge	5	188.4	6	124	25× / 0.2
Incidents · Caribbean Sea	5	89.9	4	43	1.0× / 5
Surveys · North Seasurge	5	73	2	50	2.8× / 1.8
Incidents · Indian Ocean	5	59.1	1	41	0.4× / 13.6
Exercises · South Pacific Oceansurge	5	28.6	0	—	2.1× / 2.4
Incidents · Arafura Seasurge	5	8.9	1	14	5.0× / 1
Surveys · Mediterranean Sea - Eastern Basinsurge	4	141.5	4	102	2.2× / 1.8
Surveys · Kara Seasurge	4	85.1	5	35	2.9× / 1.4
Incidents · Hudson Baysurge	4	74.9	0	—	5.0× / 0.8
Missiles · North Pacific Ocean	4	64.9	1	121	0.8× / 4.8
Incidents · Davis Strait	4	31.9	1	35	1.2× / 3.4
Derelicts · North Atlantic Ocean	4	24.3	0	—	1.4× / 2.8
Exercises · Yellow Sea	4	23.2	1	24	0.3× / 14.8
Surveys · Aegean Seanew	4	11.6	1	18	new / 0
Quakes · Bering Seasurge	4	9	0	—	5.0× / 0.8
Nav aids · Gulf of Mexico	3	261.7	8	178	1.1× / 2.8
Nav aids · North Atlantic Oceanlong running	3	199.3	6	1,531	0.4× / 7
Other · Coral Seasurgelong running	3	156.1	5	838	5.0× / 0.6
Nav aids · Coral Sealong running	3	134.7	4	1,200	1.5× / 2
Surveys · Sea of Okhotsksurge	3	116.7	4	238	15× / 0.2
Surveys · Bering Seasurgelong running	3	104.7	3	386	2.5× / 1.2
Spills · Gulf of Mexico	3	71	0	—	0.5× / 5.6
Surveys · Bay of Bengalsurgelong running	3	70.1	4	388	7.5× / 0.4
Incidents · Eastern China Seasurge	3	47.8	0	—	15× / 0.2
Spills · Bering Sea	3	42	0	—	1.9× / 1.6
Spills · North Pacific Ocean	3	34	1	40	1.5× / 2
Exercises · Laccadive Sea	3	31.5	1	28	1.9× / 1.6
Surveys · Barentsz Seasurge	3	22	2	24	5.0× / 0.6
Incidents · Bay of Bengal	3	21.5	0	—	0.8× / 3.6
Incidents · Solomon Seasurge	3	17.6	1	24	5.0× / 0.6
Derelicts · Indian Ocean	3	11.4	0	—	0.6× / 5.4
Quakes · Philippine Seasurge	3	9	0	—	3.0× / 1
Quakes · North Pacific Ocean	3	7.6	1	33	0.5× / 5.8
Derelicts · South Pacific Oceansurge	3	7.1	1	13	2.1× / 1.4
Debris · Indian Oceansurge	3	6.8	0	—	5.0× / 0.6
Surveys · Inner Seas off the West Coast of Scotlandsurge	3	6.8	0	—	15× / 0.2
Icebergs · North Atlantic Ocean	3	3.6	0	—	1.0× / 3
Nav aids · Irish Sea and St. George's Channel	3	2.2	0	—	1.1× / 2.6
Nav aids · English Channel	3	1.1	0	—	1.3× / 2.4
Incidents · Coral Sea	3	0.3	0	—	0.5× / 6.2
Ordnance · North Sea	2	89.6	2	65	5.0× / 0.4
Wrecks · South Atlantic Ocean	2	69.2	3	171	10× / 0.2
Surveys · Indian Oceannew	2	65.2	3	249	new / 0
Exercises · Arabian Sea	2	41	1	32	1.0× / 2
Nav aids · Celtic Sea	2	33.1	1	110	1.4× / 1.4
Nav aids · Andaman or Burma Sea	2	31.9	3	147	10× / 0.2
Exercises · Gulf of Mexico	2	30.7	2	15	1.0× / 2
Other · Irish Sea and St. George's Channel	2	28.7	1	28	10× / 0.2
Other · Hudson Bay	2	28.4	2	14	2.5× / 0.8
Cable ops · North Sea	2	24.9	0	—	0.3× / 5.8
Other · North Atlantic Ocean	2	24.5	1	21	2.0× / 1
Missiles · North Atlantic Ocean	2	22.1	1	66	0.3× / 7
Piracy · Red Sea	2	21.6	1	36	10× / 0.2
Cable ops · Mediterranean Sea - Eastern Basin	2	20.8	1	38	5.0× / 0.4
Exercises · Sea of Okhotsk	2	11.6	1	8	5.0× / 0.4
Exercises · Indian Oceannew	2	8.6	2	4	new / 0
Piracy · Gulf of Guinea	2	8.2	1	18	1.4× / 1.4
Missiles · South Pacific Ocean	2	8.1	0	—	1.0× / 2
Surveys · Laptev Seanew	2	7.5	1	7	new / 0
Containers · North Seanew	2	7.4	0	—	new / 0
Exercises · South China Sea	2	7.4	0	—	0.5× / 4
Other · The Northwestern Passages	2	6.9	0	—	3.3× / 0.6
Exercises · Caribbean Sea	2	6.5	0	—	3.3× / 0.6
Missiles · Indian Ocean	2	6.2	0	—	3.3× / 0.6
Quakes · Gulf of Tomininew	2	6	0	—	new / 0
Debris · Timor Seanew	2	6	0	—	new / 0
Cable ops · Gulf of Guinea	2	4.3	0	—	2.5× / 0.8
Icebergs · Laptev Sea	2	3.1	2	1	10× / 0.2
Nav aids · Gulf of Alaska	2	0.2	0	—	1.3× / 1.6
Nav aids · Timor Sea	2	0.2	0	—	2.5× / 0.8
Wrecks · South China Sealong running	1	479.4	16	1,176	1.0× / 1
Exercises · Aegean Sea	1	343.8	11	214	1.0× / 1
Surveys · Arctic Oceanlong running	1	223.7	8	1,105	5.0× / 0.2
Nav aids · Arabian Sea	1	131.5	5	95	1.0× / 1
Wrecks · South Pacific Ocean	1	118.5	3	192	5.0× / 0.2
Cable ops · South Atlantic Ocean	1	77.5	2	137	0.1× / 13.8
Wrecks · Irish Sea and St. George's Channel	1	62	2	203	new / 0
Surveys · Black Sea	1	50.5	1	95	0.4× / 2.4
Surveys · Celtic Sea	1	45.7	1	68	1.3× / 0.8
Incidents · Mozambique Channel	1	45.5	0	—	0.7× / 1.4
Cable ops · Caribbean Sea	1	41.6	1	227	1.3× / 0.8
Missiles · Aegean Sea	1	36.8	1	211	new / 0
Restricted · Black Sealong running	1	35.4	1	1,517	1.3× / 0.8
Other · South Pacific Ocean	1	34	1	89	5.0× / 0.2
Derelicts · South China Sea	1	32.7	2	192	0.6× / 1.6
Surveys · Japan Sea	1	32.6	2	61	new / 0
Nav aids · Arafura Sealong running	1	31.1	1	403	0.6× / 1.8
Incidents · Gulf of Thailand	1	28.8	0	—	new / 0
Surveys · Gulf of Mexico	1	27.9	1	45	0.7× / 1.4
Other · North Pacific Ocean	1	27.4	0	—	0.6× / 1.8
Surveys · Sea of Marmara	1	26.5	1	26	new / 0
Wrecks · Indian Ocean	1	25.5	1	25	5.0× / 0.2
Other · Celtic Sea	1	20.4	1	20	new / 0
Spills · Gulf of Alaska	1	20	1	33	1.7× / 0.6
Surveys · North Pacific Ocean	1	19.1	1	19	1.7× / 0.6
Surveys · Labrador Sea	1	18.4	1	18	new / 0
Incidents · Bay of Biscay	1	18.1	0	—	1.3× / 0.8
Other · Mediterranean Sea - Eastern Basin	1	14	0	—	0.8× / 1.2
Spills · North Atlantic Ocean	1	14	0	—	0.6× / 1.8
Incidents · Mediterranean Sea - Western Basin	1	13.7	1	37	0.6× / 1.6
Missiles · Barentsz Sea	1	11.9	0	—	0.7× / 1.4
Exercises · Barentsz Sea	1	10.3	1	32	2.5× / 0.4
Missiles · Bering Sea	1	8	0	—	5.0× / 0.2
Incidents · Java Sea	1	7.5	1	7	1.3× / 0.8
Piracy · Gulf of Oman	1	7	0	—	new / 0
Piracy · North Atlantic Ocean	1	7	0	—	5.0× / 0.2
Piracy · Gulf of Aden	1	6.5	1	33	new / 0
Exercises · Gulf of Alaska	1	6.4	0	—	5.0× / 0.2
Exercises · Baltic Sea	1	6.1	0	—	0.3× / 3
Quakes · North Atlantic Ocean	1	5.1	0	—	0.8× / 1.2
Missiles · Laccadive Sea	1	4.9	0	—	1.0× / 1
Nav aids · East Siberian Sea	1	4.7	1	4	new / 0
Missiles · Arctic Ocean	1	4.6	0	—	2.5× / 0.4
Exercises · Greenland Sea	1	3.9	1	3	new / 0
Exercises · Bering Sea	1	3.7	0	—	0.5× / 2
Cable ops · Black Sea	1	3.7	1	3	0.6× / 1.6
Wrecks · Bristol Channel	1	3.5	1	3	5.0× / 0.2
Other · Java Sea	1	3.4	0	—	new / 0
Quakes · Aegean Sea	1	3	0	—	new / 0
Containers · Arabian Sea	1	3	0	—	0.7× / 1.4
Debris · Arafura Sea	1	3	0	—	new / 0
Other · Arafura Sea	1	3	0	—	0.7× / 1.4
Quakes · Banda Sea	1	3	0	—	new / 0
Containers · Bay of Bengal	1	3	0	—	new / 0
Derelicts · Bay of Bengal	1	3	0	—	0.7× / 1.4
Derelicts · Coral Sea	1	3	0	—	1.3× / 0.8
Other · English Channel	1	3	0	—	1.7× / 0.6
Icebergs · Greenland Sea	1	3	0	—	new / 0
Cable ops · Gulf of Thailand	1	3	1	2	new / 0
Quakes · Indian Ocean	1	3	0	—	0.4× / 2.6
Derelicts · Japan Sea	1	3	0	—	5.0× / 0.2
Quakes · Japan Sea	1	3	0	—	5.0× / 0.2
Debris · North Atlantic Ocean	1	3	0	—	2.5× / 0.4
Debris · North Sea	1	3	0	—	new / 0
Quakes · Solomon Sea	1	3	0	—	0.5× / 2
Quakes · South Atlantic Ocean	1	3	0	—	0.8× / 1.2
Icebergs · Southern Ocean	1	3	0	—	5.0× / 0.2
Quakes · Tasman Sea	1	3	0	—	1.3× / 0.8
Cable ops · North Atlantic Ocean	1	2.9	0	—	0.1× / 8.6
Incidents · Makassar Strait	1	2.4	0	—	5.0× / 0.2
Mines · South Atlantic Ocean	1	2.2	1	2	new / 0
Nav aids · Beaufort Sea	1	1.1	0	—	1.0× / 1
Other · South Atlantic Ocean	1	1	0	—	2.5× / 0.4
Nav aids · Kara Sea	1	0.6	1	0	new / 0
Other · Philippine Sea	1	0.5	0	—	new / 0
Incidents · Bismarck Sea	1	0.4	1	0	1.7× / 0.6
Derelicts · Arafura Sea	1	0.1	0	—	5.0× / 0.2
Other · Gulf of Mexico	1	0.1	0	—	2.5× / 0.4
Nav aids · The Coastal Waters of Southeast Alaska and British Columbia	1	0.1	0	—	1.0× / 1
Incidents · Baffin Bay	1	0	0	—	5.0× / 0.2
Wrecks · Caribbean Sealong running	0	320.5	10	380	0.0× / 0.2
Nav aids · North Pacific Ocean	0	186	6	285	0.0× / 3.4
Surveys · Beaufort Sealong running	0	124	4	1,766	0.0× / 0.6
Other · Caribbean Sea	0	124	4	192	0.0× / 0.4
Exercises · Ionian Sea	0	93	3	211	— / 0
Wrecks · North Pacific Ocean	0	93	3	271	— / 0
Volcanic · Philippine Sealong running	0	93	3	1,919	0.0× / 0.2
Nav aids · Tasman Sealong running	0	93	3	426	0.0× / 0.8
Other · South China Sealong running	0	62.1	2	978	0.0× / 1.4
Wrecks · Arabian Sea	0	62	2	284	0.0× / 0.4
Ordnance · Black Sealong running	0	62	2	411	— / 0
Surveys · Caribbean Sea	0	62	2	200	— / 0
Nav aids · Davis Strait	0	62	2	46	0.0× / 0.8
Wrecks · Gulf of Mexico	0	62	2	137	0.0× / 0.4
Nav aids · Malacca Straitlong running	0	62	2	644	— / 0
Cable ops · Persian Gulf	0	62	2	230	0.0× / 0.6
Nav aids · Persian Gulf	0	62	2	362	0.0× / 0.4
Surveys · The Northwestern Passageslong running	0	62	2	1,820	— / 0
Wrecks · Persian Gulf	0	50.6	1	123	— / 0
Cable ops · South China Sea	0	45	0	—	0.0× / 5.4
Nav aids · Mediterranean Sea - Eastern Basinlong running	0	34.5	1	476	— / 0
Wrecks · Andaman or Burma Sea	0	31	1	206	— / 0
Restricted · Baltic Sea	0	31	1	319	— / 0

Cite: seahazards.com Sea Ledger, 2017-07, 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.