Sea Ledger, June 2020

2020-06-01 to 2020-06-30 · archive

issued: 669
warning-days in force: 10,002
in force at month end: 341
sea × type cells: 222

baseline: same month, previous 5 years (2019-06, 2018-06, 2017-06, 2016-06, 2015-06)

By type

type	issued	warning-days	in force at end
Exercises	218	1,522.2	39
Icebergs	93	110.1	4
Incidents	81	818.8	27
Nav aids	53	2,115.5	72
Surveys	48	1,634.2	63
Missiles	43	379.7	17
Quakes	31	93.3	1
Derelicts	20	88.3	4
Spills	20	234	12
Other	18	394.5	15
Cable ops	18	311.1	10
Ordnance	6	117.6	3
Containers	5	12.3	0
Piracy	4	27.3	1
Wrecks	4	1,819.7	62
Storms	2	4.9	0
Structures	1	38.9	2
Restricted	1	138.3	4
Debris	1	33	1
Volcanic	1	105.3	4
Mines	1	2.8	0

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	40	166.3	2	180	5.4× / 7.4
Exercises · North Pacific Ocean	40	149.8	2	65	1.8× / 22.4
Icebergs · Southern Oceansurge	35	35.6	1	30	3.2× / 10.8
Icebergs · Labrador Sea	30	35.1	2	31	1.6× / 18.4
Exercises · Black Seasurge	27	275.7	9	124	3.8× / 7.2
Icebergs · South Atlantic Ocean	22	21.4	1	22	1.1× / 20.6
Incidents · South China Sea	19	260.5	10	165	0.8× / 23.4
Exercises · Philippine Seasurge	17	34.1	0	—	2.7× / 6.4
Exercises · South Pacific Oceansurge	15	52.7	2	31	6.8× / 2.2
Nav aids · North Atlantic Oceansurge	14	149.7	5	325	4.1× / 3.4
Missiles · Black Seasurge	11	154.1	6	33	3.2× / 3.4
Spills · Gulf of Mexico	11	139	5	42	1.2× / 9.2
Incidents · Indian Ocean	11	56.7	1	31	1.7× / 6.6
Exercises · Aegean Seasurge	10	246.2	6	183	2.5× / 4
Incidents · North Atlantic Ocean	10	112.5	4	291	0.7× / 14
Incidents · North Pacific Ocean	10	80.1	3	38	0.4× / 23.2
Missiles · North Atlantic Ocean	10	51.9	2	31	1.1× / 8.8
Missiles · Indian Oceansurge	10	41.1	3	16	13× / 0.8
Quakes · South Pacific Ocean	10	30	0	—	0.8× / 12.2
Surveys · South Atlantic Ocean	8	111.1	5	154	0.5× / 16
Exercises · North Atlantic Ocean	8	64.6	1	39	1.5× / 5.4
Nav aids · South Pacific Oceanlong running	7	267.9	10	603	1.6× / 4.4
Surveys · Persian Gulfsurgelong running	7	120.9	5	399	7.0× / 1
Exercises · Arabian Sea	6	103.9	3	48	1.4× / 4.4
Exercises · Mediterranean Sea - Western Basinsurge	6	50.9	2	180	15× / 0.4
Exercises · Yellow Sea	6	50.7	1	32	0.8× / 8
Exercises · Bay of Bengal	6	34.5	1	32	1.0× / 6
Missiles · South Pacific Oceansurge	6	26.4	2	31	7.5× / 0.8
Exercises · Barentsz Seasurge	6	23.6	3	24	3.3× / 1.8
Exercises · Gulf of Mexicosurge	6	16.7	1	15	3.0× / 2
Cable ops · North Atlantic Ocean	5	46.3	0	—	1.0× / 4.8
Spills · North Atlantic Ocean	5	43	4	41	1.7× / 3
Surveys · Aegean Seasurge	5	37.6	2	22	3.6× / 1.4
Exercises · South Atlantic Ocean	5	30.7	1	22	0.5× / 10.4
Icebergs · Laptev Seanew	5	15	0	—	new / 0
Ordnance · North Pacific Oceannew	5	13.6	0	—	new / 0
Nav aids · South Atlantic Ocean	4	273.9	10	95	0.5× / 8.6
Surveys · Sea of Okhotsk	4	97.5	6	85	1.2× / 3.4
Nav aids · North Sea	4	67.8	2	110	0.4× / 9
Derelicts · Arabian Seasurge	4	42	1	158	2.0× / 2
Surveys · Mediterranean Sea - Eastern Basin	4	31.9	2	192	1.3× / 3.2
Quakes · North Pacific Ocean	4	11.5	0	—	0.8× / 4.8
Nav aids · Caribbean Sea	3	231.2	9	158	1.1× / 2.6
Nav aids · North Pacific Oceanlong running	3	117.1	3	490	1.0× / 3
Surveys · Black Sea	3	64.9	3	113	1.5× / 2
Incidents · Java Sea	3	58.8	1	113	1.5× / 2
Cable ops · Indian Oceansurge	3	55.7	2	302	5.0× / 0.6
Other · North Seasurge	3	49.4	2	61	3.8× / 0.8
Nav aids · Indian Oceansurgelong running	3	47.5	3	453	2.1× / 1.4
Incidents · Laccadive Seasurge	3	41.8	1	21	7.5× / 0.4
Exercises · Japan Seasurge	3	36.2	0	—	3.8× / 0.8
Incidents · Philippine Sea	3	32.7	1	27	0.6× / 5.4
Exercises · Persian Gulfsurge	3	22.8	0	—	7.5× / 0.4
Derelicts · North Atlantic Ocean	3	12.8	1	29	0.6× / 4.8
Exercises · Coral Seasurge	3	9.7	1	29	5.0× / 0.6
Containers · Tasman Seasurge	3	9	0	—	3.8× / 0.8
Incidents · South Pacific Ocean	3	5	0	—	0.4× / 7.4
Incidents · Coral Sea	3	2.8	0	—	0.8× / 3.6
Nav aids · The Coastal Waters of Southeast Alaska and British Columbia	3	1.3	0	—	1.7× / 1.8
Nav aids · Arabian Sealong running	2	127.3	3	455	1.7× / 1.2
Surveys · South Pacific Oceannew	2	87.1	3	272	new / 0
Surveys · Norwegian Sea	2	65.1	2	56	1.1× / 1.8
Nav aids · Bass Strait	2	65	2	192	3.3× / 0.6
Other · South Pacific Ocean	2	62.6	2	103	3.3× / 0.6
Nav aids · Andaman or Burma Sealong running	2	39.7	2	397	2.0× / 1
Surveys · Barentsz Sea	2	39.5	2	20	5.0× / 0.4
Cable ops · North Sea	2	37	2	36	0.8× / 2.4
Cable ops · South Pacific Ocean	2	31.9	2	19	10× / 0.2
Surveys · Mediterranean Sea - Western Basin	2	23.5	2	57	10× / 0.2
Incidents · Banda Sea	2	23.4	0	—	3.3× / 0.6
Surveys · North Pacific Ocean	2	18.7	0	—	1.0× / 2
Other · North Pacific Ocean	2	17.1	0	—	0.9× / 2.2
Spills · The Coastal Waters of Southeast Alaska and British Columbia	2	17	1	29	3.3× / 0.6
Incidents · Gulf of Thailand	2	14	2	13	1.3× / 1.6
Piracy · Gulf of Guinea	2	13.3	1	20	5.0× / 0.4
Other · South Atlantic Ocean	2	12.5	1	11	2.0× / 1
Exercises · Caribbean Sea	2	8.3	0	—	1.4× / 1.4
Surveys · Indian Ocean	2	8.3	1	26	3.3× / 0.6
Exercises · Andaman or Burma Sea	2	8	0	—	10× / 0.2
Exercises · Red Seanew	2	6.7	0	—	new / 0
Exercises · Gulf of Californianew	2	6.4	0	—	new / 0
Quakes · Coral Sea	2	6	0	—	0.8× / 2.4
Quakes · Greenland Seanew	2	6	0	—	new / 0
Quakes · Indian Ocean	2	6	0	—	0.9× / 2.2
Quakes · Molukka Sea	2	6	0	—	10× / 0.2
Derelicts · North Pacific Ocean	2	6	0	—	0.8× / 2.6
Derelicts · Tasman Sea	2	6	0	—	10× / 0.2
Derelicts · Gulf of Mexico	2	5.4	1	10	2.5× / 0.8
Storms · Gulf of Mexiconew	2	4.9	0	—	new / 0
Derelicts · South Atlantic Ocean	2	4.7	0	—	1.7× / 1.2
Quakes · South Atlantic Ocean	2	4.2	1	20	1.3× / 1.6
Cable ops · Caribbean Sea	2	3.9	1	3	10× / 0.2
Other · The Coastal Waters of Southeast Alaska and British Columbianew	2	3.5	0	—	new / 0
Incidents · Black Seanew	2	3.4	1	6	new / 0
Containers · Indian Oceannew	2	3.3	0	—	new / 0
Derelicts · Caribbean Sea	2	3	0	—	2.5× / 0.8
Surveys · Ligurian Seanew	2	2	1	6	new / 0
Incidents · Bismarck Sea	2	0.9	0	—	3.3× / 0.6
Surveys · North Atlantic Oceanlong running	1	446	15	957	0.1× / 12.8
Wrecks · Persian Gulf	1	174.3	6	363	5.0× / 0.2
Nav aids · Coral Sealong running	1	92.1	3	371	0.2× / 5.4
Cable ops · South China Sea	1	83	2	113	0.5× / 2
Restricted · South Atlantic Ocean	1	76.2	2	180	5.0× / 0.2
Other · Arabian Sealong running	1	62.6	3	520	0.8× / 1.2
Nav aids · Gulf of Mexico	1	62.1	2	159	0.3× / 3.8
Nav aids · Persian Gulf	1	60	2	77	new / 0
Wrecks · North Sea	1	57.2	2	279	0.8× / 1.2
Surveys · North Sea	1	50.6	2	64	0.2× / 5.8
Nav aids · Bay of Bengal	1	37	1	74	0.8× / 1.2
Incidents · Caribbean Sea	1	35.8	1	49	0.2× / 5.2
Incidents · Arabian Sea	1	34.9	0	—	0.3× / 3.2
Wrecks · English Channel	1	34.2	2	96	5.0× / 0.2
Nav aids · Norwegian Sea	1	33.7	1	41	new / 0
Other · English Channel	1	31.3	1	55	0.8× / 1.2
Exercises · Laccadive Sea	1	30.2	1	30	0.6× / 1.6
Missiles · Aegean Sea	1	30	1	182	1.3× / 0.8
Incidents · Mozambique Channel	1	26.5	0	—	0.7× / 1.4
Cable ops · Coral Sea	1	20.9	1	20	5.0× / 0.2
Missiles · Arctic Ocean	1	16.8	1	16	2.5× / 0.4
Other · Gulf of Mexico	1	15.7	1	15	1.7× / 0.6
Volcanic · Caribbean Sea	1	15.3	1	15	new / 0
Ordnance · Philippine Sea	1	14	0	—	1.7× / 0.6
Missiles · Barentsz Sea	1	13.4	0	—	0.2× / 6
Wrecks · Irish Sea and St. George's Channel	1	12.1	1	12	2.5× / 0.4
Spills · Bering Sea	1	12	1	12	2.5× / 0.4
Spills · Gulf of Alaska	1	12	1	12	1.3× / 0.8
Cable ops · North Pacific Ocean	1	12	0	—	2.5× / 0.4
Other · Indian Ocean	1	11.2	1	11	1.0× / 1
Structures · South Atlantic Ocean	1	8.9	1	8	new / 0
Missiles · Celtic Sea	1	7.2	0	—	5.0× / 0.2
Piracy · Makassar Strait	1	7	0	—	new / 0
Piracy · South China Sea	1	7	0	—	1.7× / 0.6
Incidents · Arafura Sea	1	4.9	0	—	1.7× / 0.6
Quakes · Philippine Sea	1	4.5	0	—	0.5× / 2.2
Incidents · Mediterranean Sea - Eastern Basin	1	4.3	1	4	0.0× / 25.4
Cable ops · Mediterranean Sea - Western Basin	1	4.3	0	—	5.0× / 0.2
Missiles · Laccadive Sea	1	3.7	0	—	1.0× / 1
Quakes · Banda Sea	1	3	0	—	1.3× / 0.8
Quakes · Eastern China Sea	1	3	0	—	new / 0
Debris · Gulf of Mexico	1	3	0	—	5.0× / 0.2
Quakes · Java Sea	1	3	0	—	new / 0
Icebergs · Kara Sea	1	3	0	—	0.6× / 1.8
Derelicts · Mediterranean Sea - Eastern Basin	1	3	0	—	5.0× / 0.2
Quakes · Red Sea	1	3	0	—	new / 0
Quakes · Solomon Sea	1	3	0	—	1.3× / 0.8
Quakes · Tasman Sea	1	3	0	—	5.0× / 0.2
Mines · Aegean Sea	1	2.8	0	—	new / 0
Incidents · Bali Sea	1	2	0	—	new / 0
Exercises · Ligurian Sea	1	1.8	0	—	new / 0
Other · North Atlantic Ocean	1	1.7	0	—	0.5× / 2.2
Exercises · Skagerrak	1	1.7	0	—	new / 0
Surveys · Bay of Bengal	1	1.6	1	1	1.3× / 0.8
Other · Mediterranean Sea - Eastern Basin	1	1.4	0	—	1.0× / 1
Nav aids · English Channel	1	1.2	0	—	0.6× / 1.6
Incidents · Flores Sea	1	1.2	1	1	new / 0
Other · Celtic Sea	1	0.9	0	—	1.3× / 0.8
Missiles · Norwegian Sea	1	0.6	1	0	2.5× / 0.4
Derelicts · English Channel	1	0.4	1	0	5.0× / 0.2
Derelicts · Laccadive Sea	1	0.4	0	—	0.7× / 1.4
Incidents · Tasman Sea	1	0.4	0	—	2.5× / 0.4
Wrecks · South China Sealong running	0	510	17	540	0.0× / 1.6
Wrecks · Caribbean Sealong running	0	240	8	1,247	0.0× / 0.2
Wrecks · North Atlantic Oceanlong running	0	180	6	971	0.0× / 0.4
Wrecks · North Pacific Oceanlong running	0	120	4	1,110	0.0× / 0.2
Other · Caribbean Sealong running	0	90	3	1,257	0.0× / 0.2
Exercises · Ionian Sea	0	90	3	183	— / 0
Nav aids · Philippine Sealong running	0	90	3	482	— / 0
Surveys · Arabian Sea	0	67.8	0	—	0.0× / 1.2
Wrecks · South Atlantic Ocean	0	67.3	2	194	0.0× / 1
Surveys · Bass Strait	0	60	2	94	0.0× / 0.2
Wrecks · East Siberian Sea	0	60	2	95	— / 0
Wrecks · Gulf of Mexicolong running	0	60	2	1,202	0.0× / 0.2
Nav aids · Inner Seas off the West Coast of Scotland	0	60	2	201	0.0× / 2.4
Nav aids · Mediterranean Sea - Western Basin	0	60	2	161	0.0× / 0.4
Nav aids · Mozambique Channel	0	60	2	127	— / 0
Ordnance · North Sea	0	60	2	260	0.0× / 5.8
Restricted · Persian Gulflong running	0	60	2	440	0.0× / 0.6
Volcanic · Philippine Sea	0	60	2	197	— / 0
Surveys · South China Sea	0	60	2	301	0.0× / 2.2
Wrecks · South Pacific Ocean	0	60	2	152	0.0× / 0.2
Nav aids · Arafura Sea	0	33.1	1	115	0.0× / 0.2
Wrecks · Andaman or Burma Sea	0	30	1	34	— / 0
Wrecks · Arabian Sea	0	30	1	280	0.0× / 0.4
Surveys · Arctic Ocean	0	30	1	264	— / 0
Surveys · Beaufort Sea	0	30	1	209	— / 0
Surveys · Bering Sea	0	30	1	296	0.0× / 0.2
Other · Black Sea	0	30	1	245	0.0× / 0.2
Surveys · Celtic Sea	0	30	1	43	0.0× / 1.4
Nav aids · Great Australian Bight	0	30	1	314	0.0× / 1
Surveys · Great Australian Bight	0	30	1	117	— / 0
Wrecks · Great Australian Bightlong running	0	30	1	386	0.0× / 0.2
Wrecks · Gulf of Californialong running	0	30	1	623	— / 0
Wrecks · Gulf of Guinea	0	30	1	272	— / 0
Surveys · Gulf of Mexico	0	30	1	56	0.0× / 1
Surveys · Gulf of Suez	0	30	1	37	0.0× / 0.2
Nav aids · Gulf of Thailand	0	30	1	257	— / 0
Wrecks · Gulf of Thailand	0	30	1	171	0.0× / 0.2
Nav aids · Laccadive Sealong running	0	30	1	424	0.0× / 0.2
Wrecks · Mediterranean Sea - Eastern Basin	0	30	1	174	0.0× / 0.2
Volcanic · Mozambique Channel	0	30	1	271	— / 0

Cite: seahazards.com Sea Ledger, 2020-06, 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.