Sea Ledger, August 2020

2020-08-01 to 2020-08-31 · archive

issued: 692
warning-days in force: 10,269
in force at month end: 325
sea × type cells: 225

baseline: same month, previous 5 years (2019-08, 2018-08, 2017-08, 2016-08, 2015-08)

By type

type	issued	warning-days	in force at end
Exercises	147	1,487.6	48
Icebergs	96	109.8	4
Incidents	91	1,015.7	29
Missiles	64	529	18
Surveys	59	2,082.3	60
Nav aids	54	1,858.7	56
Quakes	42	123.6	4
Storms	31	21.9	1
Spills	29	362	15
Derelicts	26	149.9	4
Cable ops	19	262.8	11
Other	11	395.8	13
Debris	10	34.2	1
Wrecks	7	1,480.3	48
Mines	2	7.1	1
Piracy	2	7	2
Volcanic	1	113.5	3
Containers	1	31.4	2
Restricted	0	93	3
Ordnance	0	72.1	1
Structures	0	31	1

By sea and type · 200 cells, most issued first

cell	issued	warning-days	at end	longest d	vs 5 y
Icebergs · South Atlantic Ocean	31	30.9	1	31	1.6× / 19.2
Icebergs · Southern Oceansurge	30	30	1	31	2.2× / 13.8
Exercises · Mediterranean Sea - Eastern Basinsurge	27	159.3	7	242	2.0× / 13.4
Incidents · South China Sea	26	361.6	7	204	0.8× / 33.4
Exercises · North Pacific Ocean	23	209.9	7	39	1.0× / 22.6
Icebergs · Labrador Sea	22	25.2	2	21	0.9× / 23.8
Missiles · North Atlantic Oceansurge	21	147	3	39	3.5× / 6
Missiles · South Pacific Oceansurge	21	63.5	2	24	11× / 2
Storms · North Atlantic Oceansurge	19	10.6	0	—	32× / 0.6
Exercises · Black Sea	16	243.9	8	90	0.9× / 18
Incidents · North Pacific Ocean	13	110.9	7	43	0.6× / 22
Exercises · South Atlantic Ocean	13	90	2	30	1.5× / 8.6
Missiles · Black Seasurge	12	224.1	8	33	2.4× / 5
Spills · Gulf of Mexicosurge	12	158	7	37	2.0× / 6
Incidents · South Pacific Ocean	11	66.5	4	40	1.9× / 5.8
Storms · Gulf of Mexicosurge	11	9.5	1	8	18× / 0.6
Exercises · North Atlantic Ocean	10	67.9	1	32	1.2× / 8.6
Exercises · Bay of Bengal	10	60.3	1	31	1.4× / 7.2
Surveys · Persian Gulfsurgelong running	9	188.3	6	461	4.1× / 2.2
Icebergs · Davis Straitsurge	9	11.7	0	—	3.2× / 2.8
Surveys · South Atlantic Ocean	8	196.3	2	216	0.7× / 11.6
Nav aids · North Atlantic Oceanlong running	8	169.7	6	387	1.5× / 5.4
Derelicts · Arabian Seasurge	8	76	2	220	13× / 0.6
Exercises · Arabian Seasurge	8	58	2	32	2.1× / 3.8
Exercises · Yellow Sea	8	56.8	1	31	1.0× / 7.8
Quakes · South Pacific Ocean	8	23	1	32	0.8× / 10.2
Nav aids · South Pacific Oceanlong running	7	252.4	7	665	1.8× / 3.8
Cable ops · North Atlantic Ocean	7	52.4	1	39	1.1× / 6.6
Surveys · Indian Oceansurge	7	44.7	2	24	5.8× / 1.2
Quakes · Indian Oceansurge	7	18.3	1	25	2.9× / 2.4
Nav aids · South Atlantic Ocean	6	253	9	157	1.0× / 6
Incidents · Indian Ocean	6	58.2	1	42	1.1× / 5.4
Exercises · South Pacific Ocean	6	16.6	1	26	1.3× / 4.6
Derelicts · North Atlantic Ocean	6	15.2	0	—	1.7× / 3.6
Quakes · South Atlantic Oceansurge	6	15.1	1	30	2.3× / 2.6
Surveys · North Atlantic Oceanlong running	5	313.1	11	1,019	0.8× / 6.4
Surveys · Mediterranean Sea - Eastern Basin	5	174.5	6	72	1.6× / 3.2
Surveys · North Sea	5	82.2	3	33	1.3× / 3.8
Nav aids · Caribbean Sea	4	375.9	13	220	1.5× / 2.6
Surveys · Kara Seasurge	4	119.1	3	47	4.0× / 1
Spills · Gulf of Alaskasurge	4	52	1	43	2.9× / 1.4
Spills · North Pacific Ocean	4	42	2	33	1.7× / 2.4
Exercises · Gulf of Mexicosurge	4	30.7	0	—	2.5× / 1.6
Quakes · North Pacific Ocean	4	13	0	—	0.7× / 5.8
Icebergs · Kara Seasurge	4	12	0	—	5.0× / 0.8
Debris · Timor Seanew	4	12	0	—	new / 0
Derelicts · Indian Ocean	4	9.3	0	—	1.4× / 2.8
Missiles · Indian Oceansurge	4	8.8	1	29	6.7× / 0.6
Incidents · Coral Sea	4	0.5	0	—	0.7× / 5.6
Nav aids · North Pacific Oceanlong running	3	113.5	3	395	0.6× / 5
Nav aids · Gulf of Mexico	3	81.4	3	221	1.1× / 2.6
Spills · North Atlantic Ocean	3	59	2	42	1.1× / 2.8
Incidents · North Atlantic Ocean	3	41.1	1	353	0.2× / 12.6
Incidents · Bay of Bengal	3	40	1	23	1.7× / 1.8
Exercises · Mediterranean Sea - Western Basinsurge	3	38.8	1	242	3.8× / 0.8
Incidents · South Atlantic Ocean	3	38.7	1	42	0.5× / 6
Cable ops · South Atlantic Ocean	3	35.2	2	26	1.7× / 1.8
Spills · Bering Seasurge	3	29	1	28	5.0× / 0.6
Other · North Pacific Ocean	3	28.6	1	30	0.4× / 7
Incidents · Arabian Sea	3	21	0	—	1.5× / 2
Surveys · Celtic Seasurge	3	14.8	0	—	15× / 0.2
Quakes · Solomon Sea	3	11.4	0	—	1.9× / 1.6
Quakes · Bismarck Seasurge	3	9	0	—	7.5× / 0.4
Debris · Indian Oceansurge	3	9	0	—	3.0× / 1
Nav aids · The Northwestern Passagessurge	3	7.9	0	—	3.0× / 1
Surveys · Norwegian Sea	2	101.5	4	118	3.3× / 0.6
Wrecks · Arabian Sea	2	82.9	4	342	3.3× / 0.6
Other · Arabian Sealong running	2	53.7	2	493	3.3× / 0.6
Nav aids · Inner Seas off the West Coast of Scotland	2	35	1	263	0.7× / 2.8
Surveys · Caribbean Sea	2	34.9	1	38	2.5× / 0.8
Nav aids · Coral Sea	2	34.9	0	—	0.5× / 4.4
Surveys · English Channel	2	31	1	47	10× / 0.2
Nav aids · Great Australian Bight	2	25.5	0	—	1.3× / 1.6
Incidents · Eastern China Sea	2	25.4	2	37	3.3× / 0.6
Exercises · Japan Sea	2	23.2	0	—	5.0× / 0.4
Cable ops · North Sea	2	22.5	2	98	0.3× / 6.2
Missiles · North Pacific Ocean	2	21.4	1	354	0.3× / 7.6
Incidents · Mediterranean Sea - Eastern Basin	2	19.1	1	16	0.2× / 11.4
Incidents · Bismarck Sea	2	18.4	0	—	2.5× / 0.8
Missiles · Barentsz Sea	2	15.2	0	—	0.6× / 3.6
Exercises · Kara Seanew	2	14.7	0	—	new / 0
Wrecks · North Sea	2	11.5	1	17	2.0× / 1
Exercises · Caribbean Sea	2	8.8	0	—	0.8× / 2.4
Nav aids · Gulf of Alaska	2	7.4	1	25	1.7× / 1.2
Exercises · Indian Ocean	2	7.2	1	6	1.1× / 1.8
Piracy · Gulf of Guinea	2	7	2	3	1.7× / 1.2
Quakes · Coral Sea	2	6	0	—	1.1× / 1.8
Spills · The Coastal Waters of Southeast Alaska and British Columbia	2	6	2	5	3.3× / 0.6
Incidents · Philippine Sea	2	5.8	0	—	0.4× / 4.8
Cable ops · English Channelnew	2	5.1	1	5	new / 0
Incidents · Gulf of Mexico	2	4.5	0	—	0.7× / 2.8
Quakes · North Atlantic Ocean	2	4.1	1	22	5.0× / 0.4
Other · Indian Ocean	2	3.8	1	5	5.0× / 0.4
Nav aids · English Channel	2	3	0	—	0.8× / 2.6
Exercises · Aegean Sea	1	200.8	6	245	0.8× / 1.2
Wrecks · Persian Gulflong running	1	191.6	7	425	new / 0
Surveys · Black Sea	1	91	3	75	0.7× / 1.4
Wrecks · South Atlantic Ocean	1	75.8	2	256	1.7× / 0.6
Nav aids · Andaman or Burma Sealong running	1	75.5	3	459	2.5× / 0.4
Surveys · Mediterranean Sea - Western Basin	1	62.5	2	68	new / 0
Nav aids · North Sea	1	57.4	1	32	0.1× / 10.6
Volcanic · Philippine Sea	1	51.5	1	259	new / 0
Wrecks · Andaman or Burma Sea	1	48.1	1	96	2.5× / 0.4
Surveys · South Pacific Ocean	1	46.6	1	334	1.7× / 0.6
Incidents · Caribbean Sea	1	45.1	1	111	0.5× / 2.2
Surveys · Bass Strait	1	41.9	1	156	1.3× / 0.8
Incidents · Java Sea	1	39.9	2	175	0.8× / 1.2
Surveys · Ligurian Sea	1	36.5	0	—	new / 0
Exercises · Laccadive Sea	1	31.1	1	31	0.4× / 2.4
Nav aids · Norwegian Sea	1	31	1	59	2.5× / 0.4
Cable ops · Indian Ocean	1	29.1	0	—	0.6× / 1.6
Other · English Channel	1	27.8	0	—	5.0× / 0.2
Nav aids · Mediterranean Sea - Eastern Basin	1	25.2	1	25	2.5× / 0.4
Incidents · Mozambique Channel	1	22.9	0	—	1.0× / 1
Nav aids · Tasman Sea	1	22.5	0	—	0.7× / 1.4
Incidents · Ceram Sea	1	20.2	0	—	1.0× / 1
Surveys · Sea of Marmara	1	18	1	17	new / 0
Incidents · Laccadive Sea	1	17.1	0	—	0.6× / 1.6
Incidents · Adriatic Sea	1	16.8	0	—	1.3× / 0.8
Incidents · Flores Sea	1	15.3	0	—	2.5× / 0.4
Spills · Indian Ocean	1	14	0	—	new / 0
Cable ops · Persian Gulf	1	13.3	1	13	5.0× / 0.2
Exercises · Philippine Sea	1	12.7	0	—	0.1× / 6.6
Missiles · Norwegian Sea	1	12.6	1	12	1.7× / 0.6
Nav aids · Hudson Bay	1	12.5	0	—	1.7× / 0.6
Exercises · Chukchi Sea	1	9.8	1	9	new / 0
Incidents · Malacca Strait	1	8.7	1	8	1.7× / 0.6
Surveys · Banda Sea	1	7.8	1	7	new / 0
Nav aids · Timor Sea	1	7.3	0	—	new / 0
Debris · Celtic Sea	1	7.2	1	7	1.3× / 0.8
Exercises · Gulf of California	1	6.8	0	—	5.0× / 0.2
Cable ops · Caribbean Sea	1	6.5	1	6	0.6× / 1.6
Cable ops · North Pacific Ocean	1	6.5	1	40	1.7× / 0.6
Cable ops · South Pacific Ocean	1	6.3	0	—	1.3× / 0.8
Quakes · Philippine Sea	1	5.3	0	—	0.7× / 1.4
Mines · Bering Sea	1	5	0	—	new / 0
Exercises · Persian Gulf	1	4.9	0	—	2.5× / 0.4
Other · East Siberian Sea	1	4.6	1	4	new / 0
Missiles · Arctic Ocean	1	3.6	1	3	1.7× / 0.6
Exercises · Norwegian Sea	1	3.6	1	3	1.3× / 0.8
Quakes · Gulf of Alaska	1	3.4	0	—	5.0× / 0.2
Nav aids · Beaufort Sea	1	3.1	0	—	1.0× / 1
Quakes · Banda Sea	1	3	0	—	1.7× / 0.6
Derelicts · Bay of Bengal	1	3	0	—	0.3× / 3.6
Quakes · Caribbean Sea	1	3	0	—	1.3× / 0.8
Quakes · Celebes Sea	1	3	0	—	5.0× / 0.2
Derelicts · Mediterranean Sea - Eastern Basin	1	3	0	—	1.3× / 0.8
Debris · North Pacific Ocean	1	3	0	—	1.3× / 0.8
Derelicts · North Pacific Ocean	1	3	0	—	0.6× / 1.8
Derelicts · Philippine Sea	1	3	0	—	5.0× / 0.2
Quakes · South China Sea	1	3	0	—	new / 0
Derelicts · South Pacific Ocean	1	3	0	—	0.5× / 2
Quakes · Southern Ocean	1	3	0	—	0.8× / 1.2
Debris · Tasman Sea	1	3	0	—	5.0× / 0.2
Exercises · Baltic Sea	1	2.8	1	2	0.8× / 1.2
Derelicts · English Channel	1	2.8	0	—	5.0× / 0.2
Exercises · English Channel	1	2.6	1	2	new / 0
Mines · South Atlantic Ocean	1	2.1	1	2	new / 0
Storms · Caribbean Sea	1	1.8	0	—	5.0× / 0.2
Exercises · Gulf of Alaska	1	1.8	0	—	new / 0
Other · Kara Sea	1	1.1	0	—	new / 0
Nav aids · Indian Ocean	1	0.8	0	—	0.2× / 5
Other · Gulf of Mexico	1	0.7	0	—	1.0× / 1
Exercises · Andaman or Burma Sea	1	0.6	1	0	0.5× / 2.2
Derelicts · Bay of Biscay	1	0.6	1	0	5.0× / 0.2
Nav aids · Irish Sea and St. George's Channel	1	0.6	0	—	0.5× / 2.2
Containers · Laccadive Sea	1	0.4	1	0	new / 0
Derelicts · South Atlantic Ocean	1	0	0	—	1.3× / 0.8
Incidents · Tasman Sea	1	0	0	—	1.0× / 1
Wrecks · South China Sealong running	0	279	9	561	0.0× / 1.2
Wrecks · Caribbean Sealong running	0	248.4	8	1,309	0.0× / 0.2
Wrecks · North Atlantic Oceanlong running	0	155	5	1,033	0.0× / 0.2
Surveys · Sea of Okhotsk	0	124	4	147	0.0× / 1.8
Other · Caribbean Sealong running	0	93	3	1,319	0.0× / 0.4
Exercises · Ionian Sea	0	93	3	245	— / 0
Wrecks · North Pacific Oceanlong running	0	93	3	1,172	— / 0
Wrecks · South Pacific Ocean	0	67.9	2	214	0.0× / 0.4
Cable ops · South China Sea	0	67	2	175	0.0× / 3.2
Surveys · Arctic Ocean	0	62	2	326	0.0× / 0.8
Wrecks · East Siberian Sea	0	62	2	157	— / 0
Wrecks · Gulf of Mexicolong running	0	62	2	1,264	— / 0
Nav aids · Mediterranean Sea - Western Basin	0	62	2	92	0.0× / 0.8
Restricted · South Atlantic Ocean	0	62	2	242	0.0× / 1.4
Other · South Pacific Ocean	0	62	2	165	— / 0
Ordnance · North Sea	0	58.6	1	322	0.0× / 1.8
Surveys · Barentsz Sea	0	54	1	80	0.0× / 1.2
Nav aids · Persian Gulf	0	36.7	1	138	0.0× / 0.2
Surveys · South China Sea	0	36.5	1	354	0.0× / 3.8
Missiles · Aegean Sea	0	31	1	86	— / 0
Containers · Arabian Sea	0	31	1	38	— / 0
Nav aids · Arabian Sea	0	31	1	298	0.0× / 1.8
Surveys · Balearic (Iberian Sea)	0	31	1	32	— / 0
Exercises · Barentsz Sea	0	31	1	68	0.0× / 1.6
Nav aids · Bay of Bengal	0	31	1	82	0.0× / 1.4
Surveys · Beaufort Sea	0	31	1	271	0.0× / 0.2
Surveys · Bering Sea	0	31	1	358	0.0× / 0.2
Other · Black Sea	0	31	1	307	0.0× / 0.2
Volcanic · Caribbean Sea	0	31	1	77	— / 0
Surveys · Gulf of Mexico	0	31	1	118	0.0× / 0.8
Nav aids · Gulf of Thailand	0	31	1	319	— / 0

Cite: seahazards.com Sea Ledger, 2020-08, 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.