Sea Ledger, October 2019

2019-10-01 to 2019-10-31 · archive

issued: 779
warning-days in force: 11,637
in force at month end: 382
sea × type cells: 237

baseline: same month, previous 5 years (2018-10, 2017-10, 2016-10, 2015-10, 2014-10)

By type

type	issued	warning-days	in force at end
Exercises	248	1,998.7	48
Incidents	106	816	52
Icebergs	89	103.4	2
Surveys	83	2,456.1	80
Nav aids	75	2,435.6	75
Other	31	477	18
Derelicts	24	201.6	6
Quakes	24	71.7	6
Cable ops	23	423.9	13
Missiles	23	319.1	8
Spills	21	272	8
Wrecks	9	1,769.5	54
Restricted	6	133.1	5
Storms	6	17	0
Debris	4	19.2	3
Piracy	3	21.5	0
Structures	2	47.1	2
Volcanic	1	37.3	1
Ordnance	1	17.2	1

By sea and type · 200 cells, most issued first

cell	issued	warning-days	at end	longest d	vs 5 y
Exercises · Mediterranean Sea - Eastern Basinsurge	51	302.6	7	364	6.5× / 7.8
Exercises · North Pacific Oceansurge	36	248.7	5	64	2.5× / 14.4
Exercises · Black Seasurge	31	373.6	14	62	2.9× / 10.8
Icebergs · Labrador Sea	30	35.1	2	32	1.1× / 27.6
Icebergs · South Atlantic Ocean	29	28.7	0	—	1.4× / 20.8
Exercises · Aegean Seasurge	26	318.3	6	307	5.4× / 4.8
Icebergs · Southern Oceansurge	24	24.7	0	—	2.5× / 9.4
Incidents · South China Sea	22	219.9	14	45	0.8× / 27
Incidents · North Pacific Ocean	22	111.2	8	42	1.0× / 22.2
Other · North Pacific Oceansurge	18	81.1	3	85	6.9× / 2.6
Surveys · South Atlantic Ocean	16	285.9	7	116	1.1× / 14.6
Surveys · North Atlantic Oceansurgelong running	15	566.7	20	714	3.8× / 4
Exercises · North Atlantic Ocean	15	122.4	2	62	1.7× / 9
Spills · Gulf of Mexico	12	172	4	42	1.6× / 7.6
Incidents · Arabian Seasurge	12	118	10	44	4.3× / 2.8
Exercises · Arabian Sea	12	91	4	34	1.5× / 8
Exercises · South Pacific Oceansurge	12	49.6	2	34	2.7× / 4.4
Quakes · South Pacific Ocean	12	37.3	1	32	1.2× / 9.8
Nav aids · South Atlantic Ocean	10	408.2	13	209	1.5× / 6.6
Exercises · Bay of Bengal	10	82.1	3	30	1.2× / 8.4
Exercises · South China Sea	10	41.3	1	30	1.7× / 5.8
Surveys · Persian Gulfsurge	9	272.8	10	156	7.5× / 1.2
Nav aids · North Atlantic Ocean	9	186	7	325	1.4× / 6.6
Surveys · Arabian Seasurge	9	85.8	6	47	4.1× / 2.2
Exercises · Yellow Sea	8	43.9	1	34	0.9× / 9
Incidents · South Pacific Ocean	8	42.9	3	30	1.0× / 8
Nav aids · North Pacific Ocean	7	181.1	6	247	1.5× / 4.8
Incidents · Laccadive Seasurge	7	82	6	40	7.0× / 1
Exercises · Gulf of Mexicosurge	7	67.9	0	—	3.5× / 2
Missiles · Barentsz Sea	7	47.3	1	35	0.9× / 7.6
Exercises · South Atlantic Ocean	7	44.1	0	—	0.7× / 9.6
Incidents · South Atlantic Ocean	7	18.3	0	—	1.5× / 4.8
Nav aids · Inner Seas off the West Coast of Scotland	6	49.9	2	69	1.5× / 4
Nav aids · English Channel	6	33.6	3	26	1.8× / 3.4
Surveys · Sea of Okhotsksurge	5	143.1	3	95	8.3× / 0.6
Cable ops · North Atlantic Ocean	5	79.9	3	69	0.8× / 6.4
Incidents · North Atlantic Ocean	5	77.2	4	101	0.4× / 12
Incidents · Philippine Sea	5	48.3	2	30	0.8× / 6.2
Nav aids · Great Australian Bight	5	34.6	1	71	1.9× / 2.6
Storms · Philippine Seasurge	5	16.4	0	—	6.3× / 0.8
Quakes · Philippine Seasurge	5	13.8	4	32	2.5× / 2
Nav aids · North Sea	4	88.7	2	97	0.4× / 10.8
Cable ops · North Pacific Oceansurge	4	75.2	3	63	10× / 0.4
Exercises · Andaman or Burma Seasurge	4	38.1	0	—	20× / 0.2
Exercises · Caribbean Seasurge	4	22.8	0	—	5.0× / 0.8
Icebergs · Kara Seasurge	4	12.5	0	—	5.0× / 0.8
Derelicts · North Atlantic Ocean	4	7.9	0	—	0.7× / 5.6
Nav aids · Beaufort Seasurge	4	7.6	1	24	10× / 0.4
Exercises · Philippine Sea	4	4.3	0	—	0.9× / 4.4
Nav aids · South Pacific Oceansurge	3	225.5	8	360	2.1× / 1.4
Surveys · Mediterranean Sea - Eastern Basin	3	121.6	3	115	0.5× / 6
Missiles · Black Sea	3	103.4	2	35	0.7× / 4.6
Surveys · North Seasurge	3	96.6	0	—	2.1× / 1.4
Nav aids · Aegean Seanew	3	41.2	2	212	new / 0
Derelicts · Indian Ocean	3	41.2	1	85	0.7× / 4.4
Cable ops · South China Sea	3	37.2	1	196	1.7× / 1.8
Exercises · Gulf of Californianew	3	29.5	0	—	new / 0
Derelicts · Arabian Seanew	3	13.7	2	7	new / 0
Missiles · South Pacific Oceansurge	3	12.1	2	22	2.5× / 1.2
Cable ops · Solomon Seanew	3	11.8	0	—	new / 0
Incidents · Indian Ocean	3	11.4	1	11	0.6× / 5.4
Exercises · Red Seasurge	3	9.7	0	—	15× / 0.2
Nav aids · Tasman Seasurge	3	9.1	0	—	7.5× / 0.4
Quakes · South Atlantic Ocean	3	9	0	—	1.3× / 2.4
Nav aids · The Northwestern Passages	3	4.1	1	22	1.9× / 1.6
Surveys · South China Sea	2	154.1	5	87	1.7× / 1.2
Nav aids · Coral Sea	2	64.8	2	128	0.7× / 3
Missiles · North Pacific Ocean	2	61	1	49	0.2× / 9.4
Surveys · Bay of Bengal	2	53.9	0	—	0.8× / 2.6
Restricted · South Atlantic Ocean	2	49	2	303	10× / 0.2
Surveys · South Pacific Ocean	2	38.4	1	29	3.3× / 0.6
Other · South China Sealong running	2	37.4	2	496	0.9× / 2.2
Nav aids · Arafura Sea	2	36	1	58	3.3× / 0.6
Restricted · Black Sea	2	34.8	1	80	2.5× / 0.8
Surveys · Indian Ocean	2	33.4	2	40	0.8× / 2.6
Spills · Gulf of Alaska	2	28	0	—	5.0× / 0.4
Cable ops · Strait of Gibraltar	2	27.6	0	—	10× / 0.2
Incidents · Arafura Sea	2	25	1	17	10× / 0.2
Spills · The Coastal Waters of Southeast Alaska and British Columbia	2	25	1	28	3.3× / 0.6
Spills · North Pacific Ocean	2	22	1	45	1.1× / 1.8
Other · Laccadive Sea	2	17.8	2	34	10× / 0.2
Incidents · Japan Seanew	2	16.1	2	15	new / 0
Cable ops · Gulf of Guinea	2	15.6	0	—	3.3× / 0.6
Piracy · South China Sea	2	14	0	—	10× / 0.2
Debris · North Atlantic Ocean	2	13.8	2	13	2.0× / 1
Other · English Channel	2	13	1	19	2.5× / 0.8
Spills · North Atlantic Ocean	2	11	2	44	0.8× / 2.6
Missiles · Bay of Bengal	2	10.5	0	—	2.5× / 0.8
Incidents · Java Sea	2	6.1	0	—	2.0× / 1
Derelicts · Japan Sea	2	6	0	—	1.1× / 1.8
Derelicts · Laccadive Sea	2	6	0	—	1.4× / 1.4
Debris · Timor Sea	2	3.8	1	3	2.5× / 0.8
Derelicts · South Atlantic Ocean	2	3.7	0	—	1.0× / 2
Surveys · Solomon Seanew	2	2.6	0	—	new / 0
Icebergs · Davis Strait	2	2.4	0	—	5.0× / 0.4
Exercises · Celtic Sea	2	1.6	0	—	10× / 0.2
Derelicts · Coral Sea	2	1.2	0	—	5.0× / 0.4
Incidents · Coral Sea	2	0	0	—	0.6× / 3.6
Wrecks · South China Sea	1	557.4	17	297	0.5× / 2
Nav aids · Caribbean Sealong running	1	184.9	6	632	0.3× / 3.6
Wrecks · North Pacific Oceanlong running	1	120.6	4	867	5.0× / 0.2
Wrecks · Arabian Sea	1	96.5	4	276	1.0× / 1
Wrecks · Sea of Okhotsk	1	73	1	112	5.0× / 0.2
Nav aids · Bay of Bengal	1	69.3	0	—	1.3× / 0.8
Surveys · Black Sea	1	63.5	3	57	0.5× / 2.2
Surveys · Sea of Marmara	1	62.2	3	36	new / 0
Wrecks · South Pacific Ocean	1	55.2	1	329	1.3× / 0.8
Surveys · Arctic Ocean	1	52.6	2	86	1.7× / 0.6
Wrecks · Laccadive Sea	1	49	2	241	new / 0
Nav aids · Laccadive Sea	1	39.7	1	181	1.7× / 0.6
Derelicts · North Pacific Ocean	1	34	1	31	0.6× / 1.8
Exercises · Laccadive Sea	1	32.1	1	35	0.4× / 2.6
Other · Inner Seas off the West Coast of Scotland	1	31	1	71	new / 0
Volcanic · Mozambique Channel	1	31	1	42	new / 0
Derelicts · South Pacific Ocean	1	31	1	62	0.4× / 2.6
Wrecks · Gulf of Guinea	1	29.5	1	29	5.0× / 0.2
Nav aids · Bristol Channel	1	24.7	1	24	2.5× / 0.4
Surveys · Mediterranean Sea - Western Basin	1	22.6	1	22	2.5× / 0.4
Other · Gulf of Mexico	1	19.9	0	—	1.0× / 1
Ordnance · North Sea	1	17.2	1	17	1.3× / 0.8
Incidents · Eastern China Sea	1	17.1	0	—	1.3× / 0.8
Other · North Atlantic Ocean	1	16.1	0	—	2.5× / 0.4
Surveys · Aegean Sea	1	16	0	—	0.3× / 3
Cable ops · Coral Sea	1	16	1	43	new / 0
Surveys · Gulf of Mexico	1	15.6	1	15	1.7× / 0.6
Structures · Sea of Okhotsk	1	14.6	1	14	new / 0
Nav aids · Gulf of Thailand	1	14.4	1	14	new / 0
Spills · South Atlantic Ocean	1	14	0	—	new / 0
Restricted · South Pacific Ocean	1	13.7	1	13	new / 0
Surveys · Bay of Biscay	1	13.3	1	13	new / 0
Cable ops · Philippine Sea	1	12.9	1	35	1.7× / 0.6
Surveys · Gulf of Guinea	1	11.5	1	11	5.0× / 0.2
Other · Davis Strait	1	11.4	0	—	1.7× / 0.6
Missiles · Sea of Okhotsk	1	10.5	0	—	0.6× / 1.8
Other · Hudson Bay	1	10.3	1	10	new / 0
Cable ops · Arabian Sea	1	9	0	—	5.0× / 0.2
Missiles · Arctic Ocean	1	8.8	0	—	1.0× / 1
Exercises · Barentsz Sea	1	8.5	0	—	0.4× / 2.6
Missiles · Japan Sea	1	8.5	0	—	new / 0
Missiles · Southern Ocean	1	7.3	0	—	2.5× / 0.4
Piracy · South Atlantic Ocean	1	7	0	—	2.5× / 0.4
Surveys · Andaman or Burma Sea	1	6.6	1	42	2.5× / 0.4
Wrecks · Coral Sea	1	6.6	1	6	new / 0
Surveys · Bass Strait	1	6	0	—	5.0× / 0.2
Missiles · Gulf of Oman	1	6	0	—	2.5× / 0.4
Surveys · Java Sea	1	5.6	1	5	2.5× / 0.4
Incidents · Bismarck Sea	1	5.5	0	—	0.6× / 1.8
Nav aids · Celtic Sea	1	4.9	0	—	0.5× / 2.2
Restricted · North Atlantic Ocean	1	4.6	0	—	new / 0
Surveys · North Pacific Ocean	1	4.4	1	4	1.3× / 0.8
Surveys · Inner Seas off the West Coast of Scotland	1	4	1	3	2.5× / 0.4
Missiles · North Atlantic Ocean	1	3.3	1	3	0.2× / 6.2
Derelicts · Caribbean Sea	1	3	0	—	1.7× / 0.6
Quakes · Celebes Sea	1	3	0	—	new / 0
Quakes · Indian Ocean	1	3	0	—	0.6× / 1.6
Derelicts · Mediterranean Sea - Eastern Basin	1	3	0	—	1.3× / 0.8
Quakes · North Pacific Ocean	1	3	0	—	0.2× / 4.8
Exercises · Indian Ocean	1	2.6	0	—	0.8× / 1.2
Wrecks · Kara Sea	1	2.6	1	2	new / 0
Quakes · Solomon Sea	1	2.6	1	2	0.5× / 2.2
Other · Black Sea	1	2.5	1	2	new / 0
Other · Mediterranean Sea - Eastern Basin	1	2	0	—	1.7× / 0.6
Incidents · Solomon Sea	1	1.7	0	—	1.7× / 0.6
Structures · South Atlantic Ocean	1	1.5	0	—	1.3× / 0.8
Nav aids · Bering Sea	1	1.3	0	—	2.5× / 0.4
Cable ops · Eastern China Sea	1	1	0	—	1.7× / 0.6
Derelicts · English Channel	1	0.7	0	—	2.5× / 0.4
Storms · Gulf of Mexico	1	0.6	0	—	0.4× / 2.4
Incidents · The Northwestern Passages	1	0.4	0	—	5.0× / 0.2
Incidents · Bay of Bengal	1	0.2	0	—	2.5× / 0.4
Derelicts · Celtic Sea	1	0.2	0	—	5.0× / 0.2
Incidents · Black Sea	1	0.1	1	0	5.0× / 0.2
Incidents · Timor Sea	1	0.1	0	—	1.0× / 1
Nav aids · Irish Sea and St. George's Channel	1	0	0	—	0.3× / 3.6
Wrecks · Caribbean Sealong running	0	217	7	1,004	0.0× / 0.6
Wrecks · North Atlantic Oceanlong running	0	186	6	728	0.0× / 0.4
Nav aids · Mozambique Channel	0	124	4	238	0.0× / 0.2
Nav aids · Mediterranean Sea - Western Basin	0	99.5	0	—	0.0× / 0.6
Other · Caribbean Sealong running	0	93	3	1,014	0.0× / 0.6
Nav aids · Philippine Sea	0	93	3	239	— / 0
Nav aids · Indian Ocean	0	92.6	2	210	0.0× / 1.8
Surveys · Norwegian Sea	0	91.9	2	112	— / 0
Other · Arabian Sea	0	79.5	2	277	0.0× / 0.8
Surveys · Barentsz Sea	0	66.3	1	111	0.0× / 0.6
Wrecks · Gulf of Mexicolong running	0	62	2	959	0.0× / 0.4
Exercises · Ionian Sea	0	62	2	307	— / 0
Nav aids · Mediterranean Sea - Eastern Basin	0	62	2	120	0.0× / 0.8
Derelicts · South China Sea	0	48.5	1	121	0.0× / 0.6
Nav aids · Arabian Sea	0	45.8	1	212	0.0× / 0.6
Surveys · Kara Sea	0	38.4	1	114	0.0× / 1
Nav aids · Andaman or Burma Sea	0	33.5	1	188	0.0× / 0.2
Wrecks · Andaman or Burma Sea	0	33.4	0	—	0.0× / 0.2
Missiles · Aegean Sea	0	31	1	307	0.0× / 1
Nav aids · Bass Strait	0	31	1	218	0.0× / 0.6
Surveys · Beaufort Sea	0	31	1	86	0.0× / 1.2
Surveys · Bering Sea	0	31	1	53	— / 0
Wrecks · Great Australian Bight	0	31	1	143	— / 0
Wrecks · Gulf of Californialong running	0	31	1	380	0.0× / 0.6
Cable ops · Gulf of Mexico	0	31	1	80	0.0× / 3.2
Nav aids · Gulf of Mexico	0	31	1	99	0.0× / 4.8

Cite: seahazards.com Sea Ledger, 2019-10, 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.