Sea Ledger, September 2016

2016-09-01 to 2016-09-30 · archive

issued: 680
warning-days in force: 12,715
in force at month end: 437
sea × type cells: 253

baseline: same month, previous 5 years (2015-09, 2014-09, 2013-09, 2012-09, 2011-09)

By type

type	issued	warning-days	in force at end
Incidents	138	1,275.4	55
Exercises	123	1,449.2	37
Nav aids	91	3,260.8	116
Icebergs	59	85.4	4
Cable ops	50	1,414	44
Missiles	47	319.9	13
Quakes	39	120.5	2
Surveys	32	1,787.1	64
Derelicts	32	142.7	4
Other	18	589.5	18
Spills	14	204	8
Debris	13	26.5	0
Wrecks	10	974	33
Restricted	8	621.1	22
Ordnance	2	191.8	6
Piracy	2	12.7	2
Containers	1	3.7	1
Structures	1	116.6	4
War risk	0	60	2
Volcanic	0	60	2

By sea and type · 200 cells, most issued first

cell	issued	warning-days	at end	longest d	vs 5 y
Icebergs · Labrador Sea	30	35.4	2	30	1.2× / 24.2
Exercises · North Pacific Ocean	28	161.3	2	35	1.2× / 23.2
Icebergs · South Atlantic Oceansurge	28	47	2	30	10× / 2.8
Incidents · North Pacific Ocean	23	174.9	6	35	0.7× / 31
Quakes · South Pacific Ocean	21	67	1	30	1.2× / 17.6
Incidents · South China Sea	18	225.3	16	52	1.2× / 14.8
Incidents · North Atlantic Ocean	18	169.7	8	72	1.8× / 10
Nav aids · North Sea	16	307.5	10	314	1.8× / 8.8
Exercises · North Atlantic Oceansurge	12	54.8	3	32	2.2× / 5.4
Cable ops · North Atlantic Ocean	11	236.2	7	208	1.3× / 8.8
Incidents · Philippine Seasurge	11	31.4	2	40	2.4× / 4.6
Exercises · Black Sea	10	232.7	4	122	1.4× / 7.2
Exercises · South China Seasurge	10	145.2	5	35	2.2× / 4.6
Derelicts · Indian Oceansurge	10	37.3	1	37	2.9× / 3.4
Debris · North Atlantic Oceansurge	10	16.9	0	—	25× / 0.4
Nav aids · Gulf of Mexicosurgelong running	9	213.9	7	958	3.2× / 2.8
Exercises · Bay of Bengal	9	68.5	1	32	1.1× / 7.8
Missiles · Barentsz Seasurge	9	50.9	1	38	2.4× / 3.8
Missiles · Black Seasurge	8	94	2	37	2.4× / 3.4
Spills · Gulf of Mexicosurge	8	94	4	43	4.0× / 2
Missiles · North Pacific Ocean	8	68.3	3	37	1.0× / 8
Incidents · South Atlantic Ocean	8	59.9	2	66	0.9× / 8.4
Incidents · Indian Ocean	8	48.3	4	31	0.8× / 9.8
Nav aids · North Pacific Oceansurgelong running	7	254.6	9	610	2.5× / 2.8
Nav aids · South Atlantic Ocean	7	233.7	8	170	1.0× / 7.2
Incidents · Mediterranean Sea - Eastern Basin	7	122.6	2	33	0.4× / 15.8
Exercises · South Atlantic Ocean	7	60.3	1	27	0.7× / 10.4
Cable ops · South Atlantic Ocean	7	52.5	3	21	0.5× / 13.4
Incidents · Coral Sea	7	15.2	1	25	1.7× / 4.2
Nav aids · Indian Oceansurgelong running	6	124.4	4	954	6.0× / 1
Cable ops · Arabian Seasurge	6	99.1	4	120	7.5× / 0.8
Nav aids · Great Australian Bightsurgelong running	6	64.7	4	576	15× / 0.4
Exercises · Mediterranean Sea - Eastern Basin	6	34.2	0	—	1.3× / 4.6
Quakes · North Pacific Ocean	6	17.3	1	27	0.7× / 9.2
Other · The Northwestern Passagessurge	6	4.5	0	—	5.0× / 1.2
Surveys · South Atlantic Ocean	5	188.6	6	121	1.5× / 3.4
Nav aids · Coral Sealong running	5	127.6	5	896	1.8× / 2.8
Exercises · Philippine Sea	5	86	3	36	1.2× / 4.2
Restricted · South Atlantic Oceannew	5	57.5	2	36	new / 0
Incidents · Caribbean Sea	5	46.3	0	—	1.7× / 3
Incidents · Arabian Seasurge	5	44	2	35	2.8× / 1.8
Exercises · Arabian Sea	5	35.1	2	34	0.8× / 6
Nav aids · Irish Sea and St. George's Channel	5	32.9	2	70	1.3× / 4
Cable ops · Celtic Seasurge	5	29.9	2	32	25× / 0.2
Incidents · South Pacific Ocean	5	28.8	1	24	0.7× / 7.2
Derelicts · South Atlantic Oceansurge	5	13.9	1	28	8.3× / 0.6
Missiles · North Atlantic Ocean	5	13.6	2	32	0.7× / 7.2
Cable ops · Timor Seanew	5	8.9	0	—	new / 0
Exercises · Aegean Sea	4	334.3	11	277	1.7× / 2.4
Surveys · Arctic Oceansurgelong running	4	235	8	2,167	10× / 0.4
Other · South Atlantic Oceansurgelong running	4	104.2	3	1,061	20× / 0.2
Spills · North Pacific Oceansurge	4	55	1	42	5.0× / 0.8
Surveys · Inner Seas off the West Coast of Scotlandsurge	4	33	1	25	20× / 0.2
Incidents · Mediterranean Sea - Western Basinsurge	4	29.9	4	13	5.0× / 0.8
Exercises · South Pacific Ocean	4	16.5	0	—	0.7× / 6.2
Exercises · Indian Ocean	4	13.1	0	—	1.3× / 3
Exercises · Caribbean Seasurge	4	7.8	0	—	6.7× / 0.6
Nav aids · The Coastal Waters of Southeast Alaska and British Columbiasurge	4	6.8	1	33	2.9× / 1.4
Cable ops · Kara Seasurge	3	145.4	5	86	5.0× / 0.6
Surveys · North Atlantic Oceanlong running	3	142.9	6	850	1.0× / 3
Cable ops · North Sea	3	134	4	67	0.4× / 7.8
Nav aids · Tasman Seasurge	3	91.9	3	122	7.5× / 0.4
Incidents · Gulf of Mexico	3	84.8	0	—	1.1× / 2.6
Wrecks · The Northwestern Passagessurgelong running	3	77.7	3	388	2.1× / 1.4
Nav aids · English Channel	3	33.4	1	107	1.1× / 2.8
Exercises · Laccadive Sea	3	18.7	1	32	1.9× / 1.6
Missiles · Laptev Seasurge	3	13.9	0	—	2.5× / 1.2
Missiles · Kara Seasurge	3	12.8	0	—	7.5× / 0.4
Missiles · Bay of Bengalsurge	3	12	1	28	3.8× / 0.8
Derelicts · North Atlantic Ocean	3	11	0	—	1.1× / 2.8
Quakes · Indian Oceansurge	3	9	0	—	2.5× / 1.2
Derelicts · Laccadive Seasurge	3	8.5	0	—	15× / 0.2
Exercises · Baltic Sea	3	7	1	25	0.7× / 4.4
Nav aids · Caribbean Sealong running	2	415.1	15	963	10× / 0.2
Nav aids · Celtic Sealong running	2	83.8	3	1,436	3.3× / 0.6
Nav aids · South Pacific Ocean	2	70.2	3	35	2.0× / 1
Wrecks · Caribbean Seanew	2	50.4	1	76	new / 0
Exercises · Gulf of Mexico	2	31.6	0	—	1.3× / 1.6
Nav aids · Arafura Sea	2	30.4	1	99	10× / 0.2
Incidents · Norwegian Seanew	2	27.1	1	27	new / 0
Surveys · Celtic Sea	2	26	1	22	5.0× / 0.4
Surveys · Balearic (Iberian Sea)new	2	24.6	2	23	new / 0
Nav aids · Gulf of Alaska	2	24.6	0	—	1.0× / 2
Incidents · Andaman or Burma Seanew	2	23.6	1	23	new / 0
Surveys · Black Sea	2	22.2	2	30	1.3× / 1.6
Other · Persian Gulf	2	18.1	0	—	3.3× / 0.6
Derelicts · Mediterranean Sea - Western Basinnew	2	9.9	0	—	new / 0
Missiles · Arctic Ocean	2	6.8	0	—	2.5× / 0.8
Quakes · South Atlantic Ocean	2	6.2	0	—	2.5× / 0.8
Quakes · Coral Sea	2	6	0	—	2.0× / 1
Quakes · Philippine Sea	2	6	0	—	2.5× / 0.8
Missiles · Laccadive Sea	2	5.9	1	14	2.5× / 0.8
Incidents · Hudson Bay	2	5.6	2	3	1.1× / 1.8
Nav aids · Rio de La Platanew	2	4.9	0	—	new / 0
Derelicts · Mozambique Channelnew	2	4.7	0	—	new / 0
Exercises · Coral Sea	2	3.7	0	—	0.6× / 3.2
Nav aids · Gulf of Suez	2	3.3	1	3	10× / 0.2
Other · Bering Sea	2	1.8	0	—	5.0× / 0.4
Incidents · The Northwestern Passages	2	0.8	0	—	1.3× / 1.6
Incidents · Solomon Sea	2	0.2	0	—	3.3× / 0.6
Restricted · Black Sealong running	1	96.7	3	1,213	new / 0
Surveys · Bay of Bengal	1	88.5	3	84	new / 0
Surveys · Bering Sea	1	85.3	3	82	new / 0
Nav aids · Arabian Sealong running	1	69.5	3	522	0.6× / 1.6
Cable ops · Norwegian Sea	1	67.3	1	90	5.0× / 0.2
Other · North Atlantic Oceanlong running	1	67.2	3	1,054	1.3× / 0.8
Cable ops · Gulf of Mexico	1	60	2	51	0.3× / 4
Structures · Persian Gulf	1	56.6	2	71	5.0× / 0.2
Cable ops · Caribbean Sea	1	56	1	45	0.5× / 2.2
Ordnance · Black Sea	1	55.2	2	107	new / 0
Cable ops · Barentsz Sea	1	50.8	1	67	0.8× / 1.2
Cable ops · Chukchi Sea	1	50.2	2	74	new / 0
Wrecks · Gulf of Mexicolong running	1	47.8	1	543	new / 0
Surveys · Sea of Okhotsk	1	43.6	1	115	new / 0
Surveys · Indian Ocean	1	39.9	2	269	2.5× / 0.4
Nav aids · Gulf of California	1	39.1	2	100	5.0× / 0.2
Ordnance · North Sealong running	1	37.3	2	388	1.0× / 1
Cable ops · Philippine Sea	1	34.8	1	58	2.5× / 0.4
Exercises · Sea of Okhotsk	1	34.3	0	—	2.5× / 0.4
Nav aids · Persian Gulf	1	34	1	58	new / 0
Surveys · Barentsz Sea	1	31.8	1	45	new / 0
Missiles · Aegean Sea	1	31.1	2	273	2.5× / 0.4
Surveys · Mozambique Channel	1	30	1	225	new / 0
Other · Japan Sea	1	29.6	1	29	new / 0
Cable ops · Persian Gulf	1	28	1	27	1.3× / 0.8
Incidents · Mozambique Channel	1	24.1	1	36	0.4× / 2.6
Surveys · Chukchi Sea	1	22.5	1	22	5.0× / 0.2
Cable ops · Indian Ocean	1	20.3	0	—	5.0× / 0.2
Incidents · Davis Strait	1	19.2	1	19	0.4× / 2.6
Surveys · North Sea	1	19.2	0	—	1.7× / 0.6
Spills · North Atlantic Ocean	1	19	1	33	0.7× / 1.4
Incidents · East Siberian Sea	1	18	0	—	new / 0
Incidents · Laccadive Sea	1	16.9	0	—	0.8× / 1.2
Restricted · Baltic Sea	1	15.7	1	15	new / 0
Surveys · Arabian Sea	1	15.5	1	15	2.5× / 0.4
Cable ops · South China Sea	1	10.5	1	10	0.3× / 3.2
Piracy · North Atlantic Ocean	1	9.7	1	9	new / 0
Wrecks · North Sea	1	8.8	1	8	5.0× / 0.2
Exercises · Barentsz Sea	1	8.4	0	—	0.8× / 1.2
Incidents · Persian Gulf	1	6.9	0	—	new / 0
Spills · Bering Sea	1	6	1	42	1.3× / 0.8
Exercises · Yellow Sea	1	4.8	0	—	0.1× / 10.6
Derelicts · Arabian Sea	1	4.3	0	—	1.3× / 0.8
Missiles · Southern Ocean	1	4.3	0	—	5.0× / 0.2
Missiles · Indian Ocean	1	3.9	0	—	1.7× / 0.6
Derelicts · Caribbean Sea	1	3.7	0	—	new / 0
Nav aids · Andaman or Burma Sea	1	3.5	1	3	new / 0
Wrecks · Great Australian Bight	1	3.3	0	—	new / 0
Cable ops · Bering Sea	1	3	0	—	new / 0
Quakes · Bering Sea	1	3	0	—	1.7× / 0.6
Quakes · Eastern China Sea	1	3	0	—	new / 0
Debris · English Channel	1	3	0	—	new / 0
Derelicts · Ionian Sea	1	3	0	—	5.0× / 0.2
Icebergs · Laptev Sea	1	3	0	—	0.4× / 2.8
Debris · Mediterranean Sea - Western Basin	1	3	0	—	new / 0
Derelicts · Philippine Sea	1	3	0	—	5.0× / 0.2
Quakes · Solomon Sea	1	3	0	—	0.6× / 1.8
Piracy · South China Sea	1	3	1	2	1.3× / 0.8
Debris · Timor Sea	1	3	0	—	new / 0
Other · Beaufort Sea	1	2.7	0	—	2.5× / 0.4
Surveys · East Siberian Sea	1	2.5	1	2	1.7× / 0.6
Missiles · Arabian Sea	1	2.4	1	2	1.7× / 0.6
Derelicts · Barentsz Sea	1	1.8	1	1	new / 0
Containers · Eastern China Sea	1	1.5	1	1	new / 0
Restricted · Inner Seas off the West Coast of Scotland	1	1.2	1	1	new / 0
Derelicts · Beaufort Sea	1	1.1	0	—	new / 0
Wrecks · Java Sea	1	1.1	0	—	new / 0
Nav aids · Philippine Sea	1	1.1	0	—	new / 0
Exercises · Bering Sea	1	0.7	0	—	0.5× / 2
Nav aids · Inner Seas off the West Coast of Scotland	1	0.5	0	—	0.3× / 3
Exercises · English Channel	1	0.2	0	—	new / 0
Wrecks · North Pacific Ocean	1	0.2	1	0	new / 0
Derelicts · North Pacific Ocean	1	0.1	0	—	0.4× / 2.6
Other · Bass Strait	1	0	0	—	new / 0
Incidents · Great Australian Bight	1	0	0	—	5.0× / 0.2
Restricted · North Sealong running	0	300	10	1,653	0.0× / 0.4
Surveys · Beaufort Sealong running	0	270	9	2,242	0.0× / 0.4
Nav aids · North Atlantic Oceanlong running	0	210	7	1,227	0.0× / 5.6
Wrecks · Arabian Sealong running	0	180	6	1,096	0.0× / 0.6
Nav aids · Bay of Bengal	0	120	4	353	0.0× / 1
Surveys · Davis Straitlong running	0	120	4	369	0.0× / 0.8
Nav aids · Sea of Okhotsklong running	0	120	4	1,746	— / 0
Wrecks · South China Sealong running	0	120	4	872	— / 0
Nav aids · Laccadive Sea	0	112.8	3	290	0.0× / 0.2
Ordnance · Sea of Azov	0	99.3	2	182	0.0× / 0.2
Wrecks · English Channellong running	0	90	3	395	0.0× / 0.6
Exercises · Ionian Sea	0	90	3	272	0.0× / 0.6
Nav aids · Kara Sea	0	90	3	253	0.0× / 0.4
Wrecks · Solomon Sealong running	0	90	3	570	— / 0
Other · South China Sealong running	0	90	3	674	0.0× / 1.2
Wrecks · Andaman or Burma Sealong running	0	60	2	365	— / 0
Nav aids · Bass Straitlong running	0	60	2	1,278	0.0× / 0.4
Surveys · Caribbean Sea	0	60	2	336	0.0× / 0.4
Nav aids · Davis Strait	0	60	2	30	0.0× / 1.4
Other · Davis Strait	0	60	2	33	0.0× / 0.4
Wrecks · Irish Sea and St. George's Channellong running	0	60	2	469	— / 0
Nav aids · Malacca Strait	0	60	2	340	— / 0
War risk · Mediterranean Sea - Eastern Basinlong running	0	60	2	1,955	— / 0
Surveys · Persian Gulf	0	60	2	200	0.0× / 0.2
Other · Sea of Azov	0	60	2	181	— / 0

Cite: seahazards.com Sea Ledger, 2016-09, 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.