Sea Ledger, August 2018

2018-08-01 to 2018-08-31 · archive

issued: 728
warning-days in force: 15,016
in force at month end: 480
sea × type cells: 274

baseline: same month, previous 5 years (2017-08, 2016-08, 2015-08, 2014-08, 2013-08)

By type

type	issued	warning-days	in force at end
Incidents	157	1,571.4	30
Exercises	111	1,310.2	41
Icebergs	110	123.1	5
Nav aids	85	4,223.8	142
Quakes	59	170.3	4
Surveys	52	2,153.6	77
Derelicts	37	206.1	9
Cable ops	33	482	12
Missiles	26	258.2	10
Spills	14	189	7
Wrecks	13	2,931.9	99
Other	9	644.9	20
Debris	7	50.7	2
Storms	5	99.4	3
Structures	3	113.4	5
Ordnance	3	139.4	4
Restricted	2	136.5	4
Volcanic	1	200	6
Piracy	1	7	0
Containers	0	5.2	0

By sea and type · 200 cells, most issued first

cell	issued	warning-days	at end	longest d	vs 5 y
Incidents · South China Sea	46	374.2	11	48	2.0× / 23.2
Icebergs · Southern Oceansurge	42	40.5	2	31	30× / 1.4
Icebergs · South Atlantic Oceansurge	33	36.5	1	31	4.2× / 7.8
Incidents · North Pacific Ocean	27	303.4	1	43	1.0× / 26.4
Icebergs · Labrador Sea	18	20.3	1	32	0.7× / 26.8
Exercises · North Pacific Ocean	16	174.6	4	65	0.8× / 19
Quakes · South Pacific Ocean	16	43.2	3	19	1.9× / 8.2
Icebergs · North Atlantic Oceansurge	15	19.8	1	23	5.0× / 3
Exercises · Black Sea	13	179.1	3	31	1.1× / 12.2
Nav aids · North Atlantic Oceansurgelong running	12	441.8	16	553	3.5× / 3.4
Cable ops · North Atlantic Oceansurge	12	120.6	2	56	2.0× / 6
Exercises · Bay of Bengalsurge	12	92	3	36	2.6× / 4.6
Quakes · North Pacific Oceansurge	12	38.4	0	—	2.4× / 5
Incidents · North Atlantic Ocean	11	109.1	4	38	0.8× / 14
Surveys · North Atlantic Oceansurge	10	276.9	11	288	2.8× / 3.6
Exercises · Mediterranean Sea - Eastern Basinsurge	10	15.7	2	32	2.0× / 5
Nav aids · Davis Straitsurge	10	7.6	0	—	13× / 0.8
Missiles · North Pacific Ocean	9	76.7	2	168	1.5× / 6
Incidents · South Pacific Ocean	9	28.4	0	—	1.1× / 8.6
Quakes · Bali Seanew	9	27	0	—	new / 0
Nav aids · South Atlantic Ocean	8	385.4	11	205	1.3× / 6.4
Nav aids · South Pacific Oceansurgelong running	8	300.6	12	442	2.2× / 3.6
Surveys · Mediterranean Sea - Eastern Basinsurge	8	104	4	141	10× / 0.8
Exercises · South Atlantic Ocean	8	52.4	1	33	1.0× / 7.8
Spills · Gulf of Mexico	7	87	3	44	1.4× / 5
Incidents · Philippine Sea	7	69.2	2	44	1.8× / 3.8
Exercises · North Atlantic Ocean	7	18.9	1	28	1.0× / 7
Exercises · South China Seasurge	6	104.1	3	35	2.0× / 3
Cable ops · North Sea	6	60.1	1	56	0.8× / 7.4
Exercises · Yellow Sea	6	30	1	28	0.6× / 9.8
Cable ops · Indian Oceansurge	6	19.8	1	19	15× / 0.4
Derelicts · Bay of Bengalsurge	6	11	2	17	2.5× / 2.4
Surveys · South Atlantic Ocean	5	189.8	6	150	0.8× / 6
Nav aids · North Sealong running	5	111.8	3	422	0.5× / 11
Nav aids · Arabian Seasurgelong running	5	100.2	4	491	4.2× / 1.2
Missiles · North Atlantic Ocean	5	39.9	1	32	0.9× / 5.6
Incidents · The Northwestern Passagessurge	5	31.6	2	18	3.6× / 1.4
Exercises · Laptev Seanew	5	24.3	2	11	new / 0
Exercises · Caribbean Seasurge	5	22.6	2	25	3.1× / 1.6
Derelicts · North Atlantic Ocean	5	20.9	2	32	1.7× / 3
Incidents · Coral Sea	5	19.5	0	—	1.0× / 5
Storms · North Pacific Oceannew	5	6.4	0	—	new / 0
Incidents · Mediterranean Sea - Eastern Basin	4	123.6	2	70	0.3× / 16
Nav aids · Inner Seas off the West Coast of Scotland	4	99.6	3	347	1.5× / 2.6
Incidents · Laccadive Seasurge	4	52.8	0	—	2.9× / 1.4
Exercises · Arabian Sea	4	46.9	2	35	1.3× / 3
Incidents · Caribbean Sea	4	41.3	3	42	0.9× / 4.6
Spills · North Atlantic Ocean	4	39	3	39	1.3× / 3.2
Cable ops · South China Sea	4	32.6	1	31	1.1× / 3.6
Quakes · Caribbean Seanew	4	9	0	—	new / 0
Incidents · Indian Ocean	4	8.3	0	—	0.4× / 9.2
Nav aids · Caribbean Sealong running	3	754.5	26	465	1.9× / 1.6
Nav aids · North Pacific Ocean	3	378.5	12	307	0.8× / 4
Nav aids · Gulf of Mexicolong running	3	321.6	12	574	1.0× / 3
Nav aids · Coral Sealong running	3	182.6	5	874	0.7× / 4.2
Surveys · Sea of Okhotsksurge	3	115.2	5	71	3.8× / 0.8
Surveys · South China Sea	3	81.7	5	249	1.1× / 2.8
Nav aids · Tasman Seasurgelong running	3	70.8	2	549	2.1× / 1.4
Derelicts · South China Sealong running	3	50	2	588	1.4× / 2.2
Surveys · North Sea	3	47.4	2	31	1.5× / 2
Spills · North Pacific Oceansurge	3	46	1	36	2.1× / 1.4
Incidents · Mozambique Channelsurge	3	38.7	0	—	2.1× / 1.4
Exercises · Laccadive Sea	3	36.4	1	31	1.7× / 1.8
Missiles · Black Sea	3	35.2	3	31	0.7× / 4.6
Nav aids · Indian Oceanlong running	3	31.8	1	377	0.8× / 4
Nav aids · Gulf of Alaskasurge	3	31.7	2	25	3.0× / 1
Derelicts · Laccadive Seasurge	3	19.6	0	—	7.5× / 0.4
Exercises · South Pacific Ocean	3	18.7	0	—	0.9× / 3.2
Exercises · Sea of Okhotsksurge	3	18.2	2	27	2.5× / 1.2
Incidents · Japan Seasurge	3	10.5	1	30	15× / 0.2
Exercises · Indian Oceansurge	3	9.8	0	—	2.5× / 1.2
Quakes · South Atlantic Ocean	3	9	0	—	1.1× / 2.6
Quakes · Southern Oceannew	3	9	0	—	new / 0
Derelicts · Indian Ocean	3	7	0	—	0.7× / 4.4
Wrecks · South China Sealong running	2	634.7	22	1,572	2.5× / 0.8
Wrecks · North Sealong running	2	171.3	6	520	1.7× / 1.2
Wrecks · Arabian Sealong running	2	119.2	5	680	2.5× / 0.8
Other · South China Sealong running	2	104.5	5	1,374	1.1× / 1.8
Nav aids · Mediterranean Sea - Western Basinnew	2	90.6	3	198	new / 0
Ordnance · North Sea	2	77.4	2	78	1.4× / 1.4
Surveys · Kara Sea	2	71.7	3	50	2.5× / 0.8
Wrecks · The Northwestern Passageslong running	2	67.2	4	370	2.5× / 0.8
Cable ops · South Pacific Ocean	2	43.1	1	29	5.0× / 0.4
Structures · South Atlantic Ocean	2	37.5	3	32	5.0× / 0.4
Surveys · Bass Straitnew	2	36.1	1	73	new / 0
Nav aids · The Northwestern Passages	2	33.9	1	28	5.0× / 0.4
Surveys · Bay of Bengallong running	2	32	3	784	0.9× / 2.2
Nav aids · Great Australian Bight	2	31.9	1	204	2.0× / 1
Incidents · Molukka Sea	2	27.9	0	—	10× / 0.2
Missiles · Arctic Oceannew	2	27.7	1	22	new / 0
Incidents · Java Sea	2	18	0	—	3.3× / 0.6
Incidents · Bay of Bengal	2	17.2	0	—	1.3× / 1.6
Incidents · Gulf of Guineanew	2	12.7	0	—	new / 0
Missiles · South Pacific Ocean	2	10.8	0	—	1.3× / 1.6
Derelicts · Japan Sea	2	7.1	0	—	10× / 0.2
Quakes · Beaufort Seanew	2	6	0	—	new / 0
Derelicts · Gulf of Mexico	2	6	1	46	1.4× / 1.4
Quakes · Indian Ocean	2	6	0	—	0.8× / 2.4
Icebergs · Laptev Sea	2	6	0	—	0.7× / 2.8
Derelicts · Tasman Sea	2	6	0	—	3.3× / 0.6
Quakes · Timor Seanew	2	6	0	—	new / 0
Debris · Indian Ocean	2	4.7	1	4	3.3× / 0.6
Incidents · Flores Sea	2	3.5	1	31	5.0× / 0.4
Surveys · Alboran Seanew	2	3.3	0	—	new / 0
Derelicts · North Pacific Ocean	2	3.2	1	4	1.0× / 2
Surveys · Ionian Seanew	2	3.1	0	—	new / 0
Incidents · Solomon Sea	2	2.8	0	—	2.5× / 0.8
Incidents · Bismarck Sea	2	0.5	0	—	5.0× / 0.4
Surveys · Arctic Oceanlong running	1	210.2	7	1,501	2.5× / 0.4
Other · Coral Sealong running	1	94.7	3	633	5.0× / 0.2
Surveys · Bering Sealong running	1	93	3	416	new / 0
Wrecks · Laccadive Sealong running	1	92.7	2	448	new / 0
Wrecks · Gulf of Guinealong running	1	80.3	3	366	2.5× / 0.4
Wrecks · Irish Sea and St. George's Channellong running	1	61.2	2	599	2.5× / 0.4
Incidents · Eastern China Sea	1	58.3	1	47	5.0× / 0.2
Surveys · Gulf of Guinea	1	41.6	2	105	new / 0
Debris · Tasman Sea	1	34	1	61	new / 0
Exercises · Philippine Sea	1	33.5	2	35	0.2× / 5.2
Surveys · Black Sea	1	31.8	0	—	0.7× / 1.4
Incidents · Arabian Sea	1	31.2	1	78	0.8× / 1.2
Ordnance · Sea of Azovlong running	1	31	1	385	1.7× / 0.6
Derelicts · South Pacific Ocean	1	31	1	63	0.4× / 2.4
Cable ops · South Atlantic Ocean	1	30.1	1	113	0.1× / 9.8
Wrecks · Bay of Bengal	1	29.7	1	231	5.0× / 0.2
Surveys · North Pacific Ocean	1	29.4	1	67	2.5× / 0.4
Cable ops · Japan Sea	1	26.6	0	—	new / 0
Surveys · Laptev Sea	1	24.3	1	24	5.0× / 0.2
Nav aids · Alboran Sea	1	24.1	1	183	new / 0
Surveys · Arabian Sea	1	22.6	1	22	2.5× / 0.4
Wrecks · Solomon Sea	1	19.8	1	19	5.0× / 0.2
Incidents · South Atlantic Ocean	1	18.8	0	—	0.1× / 7
Derelicts · Davis Strait	1	17.4	0	—	new / 0
Other · Gulf of Oman	1	17	0	—	new / 0
Incidents · Beaufort Sea	1	16.3	1	16	new / 0
Incidents · Persian Gulf	1	16.3	0	—	new / 0
Incidents · Baffin Bay	1	16.2	0	—	1.7× / 0.6
Missiles · Indian Ocean	1	15.8	1	15	1.3× / 0.8
Incidents · Andaman or Burma Sea	1	15.7	0	—	new / 0
Exercises · Gulf of Mexico	1	15.3	0	—	0.6× / 1.8
Incidents · Sulu Sea	1	15.3	0	—	new / 0
Incidents · Bay of Biscay	1	14.8	0	—	0.6× / 1.8
Other · Bay of Biscay	1	14.5	0	—	2.5× / 0.4
Volcanic · Eastern China Sea	1	14	0	—	new / 0
Structures · Gulf of Mexico	1	13.9	0	—	new / 0
Nav aids · Laccadive Sea	1	12.5	1	12	1.3× / 0.8
Other · Gulf of Mexico	1	12.2	1	12	1.3× / 0.8
Cable ops · Celtic Sea	1	10.1	1	10	1.0× / 1
Restricted · Barentsz Sea	1	7	0	—	new / 0
Piracy · Sulu Sea	1	7	0	—	new / 0
Missiles · Sea of Okhotsk	1	6.6	1	6	new / 0
Exercises · Baltic Sea	1	5.1	0	—	0.5× / 2.2
Missiles · Japan Sea	1	5.1	0	—	5.0× / 0.2
Missiles · Laccadive Sea	1	4.9	0	—	1.3× / 0.8
Other · Celtic Sea	1	4.8	0	—	new / 0
Missiles · Barentsz Sea	1	4.5	0	—	0.3× / 3.4
Exercises · Coral Sea	1	4.3	0	—	0.5× / 2.2
Quakes · Solomon Sea	1	4.3	0	—	0.7× / 1.4
Nav aids · Arafura Sea	1	3.9	0	—	5.0× / 0.2
Nav aids · Irish Sea and St. George's Channel	1	3.9	0	—	0.4× / 2.6
Exercises · Barentsz Sea	1	3.5	0	—	2.5× / 0.4
Surveys · Indian Ocean	1	3.5	0	—	1.0× / 1
Debris · Arafura Sea	1	3	0	—	new / 0
Quakes · Bay of Bengal	1	3	0	—	new / 0
Derelicts · Coral Sea	1	3	0	—	new / 0
Quakes · Coral Sea	1	3	0	—	1.0× / 1
Quakes · Flores Sea	1	3	0	—	new / 0
Debris · Gulf of Guinea	1	3	0	—	new / 0
Derelicts · Gulf of Guinea	1	3	0	—	new / 0
Derelicts · Mediterranean Sea - Eastern Basin	1	3	0	—	0.5× / 2.2
Derelicts · Mediterranean Sea - Western Basin	1	3	0	—	1.7× / 0.6
Debris · North Sea	1	3	0	—	5.0× / 0.2
Quakes · Norwegian Sea	1	3	0	—	new / 0
Derelicts · Solomon Sea	1	3	0	—	new / 0
Debris · South Pacific Ocean	1	3	0	—	new / 0
Other · Flores Sea	1	2.6	0	—	new / 0
Restricted · Persian Gulf	1	2.6	0	—	new / 0
Derelicts · English Channel	1	2.2	0	—	new / 0
Exercises · Mediterranean Sea - Western Basin	1	2.2	0	—	2.5× / 0.4
Incidents · Malacca Strait	1	1.3	0	—	5.0× / 0.2
Exercises · Bering Sea	1	1.1	0	—	0.4× / 2.6
Nav aids · English Channel	1	1	0	—	0.4× / 2.4
Surveys · Philippine Sea	1	1	0	—	2.5× / 0.4
Surveys · South Pacific Ocean	1	0.7	1	0	new / 0
Quakes · Philippine Sea	1	0.4	1	0	0.7× / 1.4
Nav aids · Laptev Sea	1	0.3	1	0	5.0× / 0.2
Other · North Pacific Ocean	1	0.3	0	—	1.0× / 1
Derelicts · Caribbean Sea	1	0.2	0	—	0.6× / 1.8
Incidents · Celtic Sea	1	0.2	0	—	1.7× / 0.6
Wrecks · Caribbean Sealong running	0	651	21	592	— / 0
Exercises · Aegean Sea	0	308.5	9	247	0.0× / 1
Other · Caribbean Sealong running	0	157.3	4	588	0.0× / 0.2
Surveys · Beaufort Sealong running	0	155	5	2,162	0.0× / 0.2
Surveys · The Northwestern Passageslong running	0	155	5	2,216	0.0× / 0.6
Wrecks · North Atlantic Oceanlong running	0	124	4	578	0.0× / 0.4
Wrecks · North Pacific Oceanlong running	0	124	4	498	— / 0
Surveys · Norwegian Sea	0	120.4	3	59	0.0× / 0.4
Wrecks · East Siberian Sea	0	93	3	56	— / 0
Wrecks · English Channel	0	93	3	183	0.0× / 1
Nav aids · Gulf of California	0	93	3	307	0.0× / 0.2
Wrecks · Gulf of Mexicolong running	0	93	3	533	— / 0

Cite: seahazards.com Sea Ledger, 2018-08, 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.