Sea Ledger, July 2020

2020-07-01 to 2020-07-31 · archive

issued: 657
warning-days in force: 10,327
in force at month end: 309
sea × type cells: 233

baseline: same month, previous 5 years (2019-07, 2018-07, 2017-07, 2016-07, 2015-07)

By type

type	issued	warning-days	in force at end
Exercises	161	1,377.3	39
Incidents	108	809.7	22
Icebergs	100	121.7	4
Surveys	53	1,989.7	64
Missiles	50	447.9	12
Nav aids	34	2,204.6	62
Quakes	34	87	5
Cable ops	27	354.9	13
Storms	20	13.9	1
Derelicts	20	134	3
Spills	17	243	10
Other	12	469.8	13
Ordnance	7	94.2	3
Wrecks	4	1,674.8	49
Debris	4	11.7	0
Piracy	3	16.8	0
Containers	3	13.5	1
Structures	0	35.5	1
Restricted	0	102.6	3
Volcanic	0	124	4

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	31	1	31	1.6× / 19.8
Exercises · Black Sea	30	325.6	9	59	1.5× / 20.2
Exercises · North Pacific Ocean	30	131	7	35	1.5× / 19.6
Icebergs · Southern Oceansurge	30	30	1	31	2.5× / 12
Icebergs · Labrador Sea	28	34.2	0	—	1.0× / 28
Incidents · South China Sea	23	207.5	4	196	0.9× / 26.8
Exercises · Mediterranean Sea - Eastern Basin	22	126.1	1	211	1.8× / 12
Missiles · North Atlantic Oceansurge	19	73.1	3	47	4.1× / 4.6
Incidents · North Pacific Ocean	17	109.6	4	43	0.6× / 26.4
Surveys · South Atlantic Ocean	12	287.5	6	185	1.1× / 11
Missiles · Black Seasurge	10	211.9	6	35	3.3× / 3
Cable ops · North Atlantic Ocean	10	72.5	3	30	1.3× / 8
Incidents · South Atlantic Ocean	10	58.1	2	19	1.1× / 9.4
Exercises · Yellow Sea	10	50.8	2	35	0.9× / 10.8
Missiles · Indian Oceansurge	10	33.6	0	—	7.1× / 1.4
Quakes · Gulf of Alaskasurge	9	20.7	1	9	45× / 0.2
Exercises · Philippine Seasurge	9	11.2	3	27	2.1× / 4.2
Storms · North Pacific Oceannew	9	6	0	—	new / 0
Exercises · South Pacific Ocean	8	53.8	0	—	1.9× / 4.2
Exercises · Bay of Bengal	8	47.8	1	32	1.4× / 5.6
Exercises · Aegean Seasurge	7	214.7	7	214	5.8× / 1.2
Surveys · Persian Gulfsurgelong running	7	155.8	6	430	12× / 0.6
Incidents · North Atlantic Ocean	7	129.6	2	322	0.4× / 16.2
Spills · Gulf of Mexico	7	100	3	44	1.2× / 6
Ordnance · North Seasurge	7	63.2	2	291	8.8× / 0.8
Exercises · South Atlantic Ocean	7	59.4	0	—	0.9× / 7.8
Incidents · Indian Ocean	7	47.5	2	37	1.5× / 4.6
Nav aids · North Pacific Oceanlong running	6	121.5	4	521	1.5× / 4
Surveys · Kara Seasurge	6	74.4	3	29	2.5× / 2.4
Quakes · North Pacific Ocean	6	17	1	26	1.0× / 6
Incidents · Black Seanew	6	12.6	1	31	new / 0
Storms · Gulf of Mexicosurge	6	6.5	0	—	10× / 0.6
Incidents · Coral Sea	6	5.9	0	—	1.3× / 4.8
Exercises · North Atlantic Ocean	5	21.6	1	70	1.0× / 5
Derelicts · South Pacific Oceansurge	5	19.5	0	—	3.6× / 1.4
Quakes · Solomon Seasurge	5	9.6	1	27	2.8× / 1.8
Nav aids · North Atlantic Ocean	4	131.7	6	356	0.7× / 6
Nav aids · North Sea	4	66	2	141	0.5× / 8.4
Spills · North Atlantic Oceansurge	4	63	3	45	2.9× / 1.4
Cable ops · Indian Oceannew	4	48.6	2	333	new / 0
Surveys · North Sea	4	34.5	2	80	1.1× / 3.6
Cable ops · Eastern China Seanew	4	20.9	0	—	new / 0
Exercises · Andaman or Burma Seasurge	4	18.8	0	—	10× / 0.4
Incidents · South Pacific Ocean	4	12.3	1	30	0.6× / 6.6
Icebergs · Laptev Seasurge	4	12	0	—	5.0× / 0.8
Exercises · Coral Seasurge	4	10.6	0	—	2.9× / 1.4
Incidents · Bismarck Seasurge	4	10.5	0	—	2.2× / 1.8
Quakes · South Pacific Ocean	4	10.2	1	14	0.4× / 11.2
Quakes · Philippine Sea	4	9.7	1	25	1.8× / 2.2
Incidents · Arafura Seasurge	4	4.9	1	28	2.9× / 1.4
Storms · North Atlantic Oceannew	4	1.4	1	1	new / 0
Surveys · North Atlantic Oceanlong running	3	345.5	10	988	0.4× / 6.8
Nav aids · South Pacific Oceanlong running	3	330.7	9	634	0.7× / 4.4
Nav aids · Coral Sealong running	3	115.1	3	402	1.0× / 3
Surveys · Mediterranean Sea - Eastern Basin	3	91.4	5	41	1.5× / 2
Missiles · North Pacific Ocean	3	43.8	1	323	0.6× / 5
Exercises · Arabian Sea	3	37.8	1	56	1.3× / 2.4
Incidents · Java Seasurge	3	34.3	1	144	3.8× / 0.8
Nav aids · Great Australian Bightsurge	3	34	1	345	7.5× / 0.4
Spills · North Pacific Ocean	3	30	1	20	1.3× / 2.4
Missiles · Barentsz Sea	3	23	0	—	1.7× / 1.8
Piracy · Gulf of Guinea	3	16.8	0	—	1.9× / 1.6
Exercises · Japan Seasurge	3	13.3	1	29	7.5× / 0.4
Icebergs · Kara Seasurge	3	9	0	—	7.5× / 0.4
Icebergs · Davis Straitsurge	3	2.5	2	2	5.0× / 0.6
Incidents · Celtic Seasurge	3	1.9	0	—	5.0× / 0.6
Nav aids · South Atlantic Ocean	2	302.4	8	126	0.4× / 5.4
Nav aids · Caribbean Sea	2	299.8	10	189	0.8× / 2.4
Cable ops · South China Sea	2	74.9	3	144	0.9× / 2.2
Exercises · Barentsz Sea	2	46.4	1	37	2.0× / 1
Exercises · Laccadive Sea	2	37	1	31	1.3× / 1.6
Nav aids · Norwegian Seanew	2	31	1	72	new / 0
Spills · Gulf of Alaska	2	25	2	43	2.0× / 1
Cable ops · North Pacific Ocean	2	16.1	1	21	10× / 0.2
Incidents · Mediterranean Sea - Eastern Basin	2	15.4	0	—	0.1× / 14
Missiles · South Pacific Ocean	2	15	0	—	0.6× / 3.4
Surveys · Celtic Sea	2	11.9	1	74	3.3× / 0.6
Derelicts · North Atlantic Ocean	2	7.4	0	—	0.8× / 2.6
Derelicts · Indian Ocean	2	7.2	0	—	0.7× / 3
Other · North Pacific Ocean	2	7.2	0	—	0.3× / 7.4
Quakes · Andaman or Burma Sea	2	6	0	—	10× / 0.2
Derelicts · Laccadive Sea	2	6	0	—	2.0× / 1
Cable ops · Celtic Sea	2	4.5	1	5	1.3× / 1.6
Debris · Indian Ocean	2	4	0	—	1.4× / 1.4
Other · Gulf of Alaskanew	2	2.1	0	—	new / 0
Wrecks · Caribbean Sealong running	1	255.3	9	1,278	5.0× / 0.2
Surveys · Sea of Okhotsk	1	166.4	4	116	0.5× / 2.2
Wrecks · South Pacific Ocean	1	91.6	3	183	2.5× / 0.4
Surveys · Black Sea	1	87.1	3	92	0.5× / 2.2
Surveys · Norwegian Sea	1	83.1	2	87	0.3× / 3.8
Surveys · Mediterranean Sea - Western Basin	1	78.3	3	37	new / 0
Surveys · South China Sea	1	74.4	2	332	0.6× / 1.6
Wrecks · South Atlantic Ocean	1	66.1	3	225	0.8× / 1.2
Nav aids · Gulf of Mexico	1	63.9	2	190	0.3× / 3.8
Surveys · Barentsz Sea	1	62.2	2	51	0.5× / 2
Nav aids · Mediterranean Sea - Western Basin	1	62	2	192	1.3× / 0.8
Derelicts · Arabian Sea	1	61.3	2	189	new / 0
Wrecks · Arabian Sea	1	49.4	2	311	1.7× / 0.6
Incidents · Caribbean Sea	1	45.9	1	80	0.1× / 6.6
Other · South Atlantic Ocean	1	40.6	2	42	1.0× / 1
Surveys · Arctic Ocean	1	39.2	2	295	5.0× / 0.2
Exercises · Mediterranean Sea - Western Basin	1	37.7	1	211	1.3× / 0.8
Nav aids · Bay of Bengal	1	32	1	51	new / 0
Other · Kara Sea	1	28.8	0	—	new / 0
Other · Persian Gulf	1	25.3	1	25	new / 0
Nav aids · Timor Sea	1	25	1	25	1.7× / 0.6
Incidents · Ionian Sea	1	19.3	0	—	1.7× / 0.6
Surveys · North Pacific Ocean	1	17.6	0	—	1.3× / 0.8
Incidents · Timor Sea	1	17	0	—	0.7× / 1.4
Incidents · Philippine Sea	1	16.6	0	—	0.2× / 4.6
Other · North Atlantic Ocean	1	16.2	1	16	0.7× / 1.4
Surveys · English Channel	1	16.1	1	16	5.0× / 0.2
Exercises · Ligurian Sea	1	13.2	0	—	new / 0
Surveys · Sea of Marmara	1	13	0	—	1.7× / 0.6
Spills · Red Sea	1	12	1	12	new / 0
Surveys · Coral Sea	1	11.9	1	11	new / 0
Exercises · South China Sea	1	11.5	0	—	0.2× / 4.8
Surveys · Aegean Sea	1	10.5	1	53	0.5× / 2
Incidents · Mozambique Channel	1	10.4	1	10	0.7× / 1.4
Derelicts · Persian Gulf	1	8.4	1	8	new / 0
Containers · Arabian Sea	1	7.5	1	7	5.0× / 0.2
Surveys · Caribbean Sea	1	7.4	1	7	new / 0
Missiles · Japan Sea	1	6.8	0	—	0.6× / 1.6
Incidents · Ceram Sea	1	6.5	1	6	1.7× / 0.6
Incidents · Eastern China Sea	1	6.4	1	6	0.5× / 2
Exercises · Gulf of Mexico	1	5.7	0	—	0.5× / 2.2
Cable ops · Irish Sea and St. George's Channel	1	5.7	0	—	new / 0
Derelicts · English Channel	1	5.6	0	—	new / 0
Exercises · Indian Ocean	1	5.2	0	—	2.5× / 0.4
Cable ops · Persian Gulf	1	4.3	0	—	new / 0
Incidents · Singapore Strait	1	3.7	0	—	new / 0
Exercises · Caribbean Sea	1	3.4	0	—	0.6× / 1.6
Icebergs · Barentsz Sea	1	3	0	—	new / 0
Derelicts · Bay of Bengal	1	3	0	—	1.0× / 1
Debris · Caribbean Sea	1	3	0	—	1.7× / 0.6
Derelicts · Caribbean Sea	1	3	0	—	1.3× / 0.8
Derelicts · Coral Sea	1	3	0	—	1.7× / 0.6
Quakes · Coral Sea	1	3	0	—	0.3× / 3
Quakes · Flores Sea	1	3	0	—	5.0× / 0.2
Quakes · Java Sea	1	3	0	—	new / 0
Derelicts · Mediterranean Sea - Eastern Basin	1	3	0	—	5.0× / 0.2
Derelicts · Mediterranean Sea - Western Basin	1	3	0	—	1.7× / 0.6
Derelicts · North Pacific Ocean	1	3	0	—	1.3× / 0.8
Containers · South Atlantic Ocean	1	3	0	—	new / 0
Quakes · Southern Ocean	1	3	0	—	2.5× / 0.4
Containers · Tasman Sea	1	3	0	—	5.0× / 0.2
Other · Tasman Sea	1	3	0	—	1.7× / 0.6
Debris · Timor Sea	1	3	0	—	2.5× / 0.4
Other · Bering Sea	1	2.6	0	—	5.0× / 0.2
Surveys · Indian Ocean	1	2.6	0	—	1.7× / 0.6
Surveys · Labrador Sea	1	2.5	1	2	2.5× / 0.4
Missiles · South China Sea	1	2.1	0	—	5.0× / 0.2
Surveys · Balearic (Iberian Sea)	1	2	1	1	new / 0
Incidents · Savu Sea	1	1.9	0	—	new / 0
Other · The Coastal Waters of Southeast Alaska and British Columbia	1	1.9	0	—	new / 0
Exercises · English Channel	1	1.7	0	—	new / 0
Other · Mediterranean Sea - Eastern Basin	1	1.1	0	—	0.8× / 1.2
Nav aids · English Channel	1	0.8	0	—	0.4× / 2.4
Incidents · Banda Sea	1	0.7	0	—	5.0× / 0.2
Incidents · Celebes Sea	1	0.6	0	—	new / 0
Missiles · Gulf of Mexico	1	0.3	1	0	new / 0
Cable ops · Gulf of Thailand	1	0.1	1	0	5.0× / 0.2
Storms · Caribbean Sea	1	0	0	—	new / 0
Incidents · Great Australian Bight	1	0	0	—	new / 0
Wrecks · South China Sealong running	0	369.4	9	571	0.0× / 1.6
Wrecks · Persian Gulflong running	0	186	6	394	0.0× / 0.4
Wrecks · North Atlantic Oceanlong running	0	164.6	5	1,002	0.0× / 0.2
Wrecks · North Pacific Oceanlong running	0	102.6	3	1,141	0.0× / 0.2
Other · Caribbean Sealong running	0	93	3	1,288	0.0× / 0.6
Exercises · Ionian Sea	0	93	3	214	— / 0
Nav aids · Arabian Sealong running	0	91.9	1	486	0.0× / 1.2
Other · Arabian Sealong running	0	71.6	2	551	0.0× / 0.4
Surveys · South Pacific Ocean	0	71.6	1	303	0.0× / 0.4
Nav aids · Andaman or Burma Sealong running	0	62	2	428	0.0× / 1
Nav aids · Bass Strait	0	62	2	223	0.0× / 0.2
Wrecks · East Siberian Sea	0	62	2	126	0.0× / 0.6
Wrecks · Gulf of Mexicolong running	0	62	2	1,233	— / 0
Nav aids · Persian Gulf	0	62	2	107	— / 0
Volcanic · Philippine Sea	0	62	2	228	0.0× / 0.4
Restricted · South Atlantic Ocean	0	62	2	211	0.0× / 1
Other · South Pacific Ocean	0	62	2	134	0.0× / 0.4
Nav aids · Inner Seas off the West Coast of Scotland	0	61.5	1	232	0.0× / 3.8
Wrecks · English Channel	0	58.7	1	127	0.0× / 0.4
Nav aids · Indian Ocean	0	56.4	0	—	0.0× / 3.2
Cable ops · South Pacific Ocean	0	44.2	1	50	— / 0
Surveys · Bass Strait	0	41.3	1	125	0.0× / 0.4
Restricted · Persian Gulflong running	0	40.6	1	471	0.0× / 0.2
Nav aids · Mozambique Channel	0	40.2	0	—	0.0× / 0.2
Other · North Sea	0	35.4	0	—	0.0× / 2.4
Cable ops · North Sea	0	32.8	1	67	0.0× / 3
Missiles · Aegean Sea	0	31	1	55	0.0× / 0.2
Wrecks · Andaman or Burma Sea	0	31	1	65	0.0× / 0.2
Nav aids · Arafura Sea	0	31	1	146	0.0× / 0.4
Surveys · Beaufort Sea	0	31	1	240	0.0× / 0.4
Surveys · Bering Sea	0	31	1	327	0.0× / 1.2
Other · Black Sea	0	31	1	276	0.0× / 0.4
Volcanic · Caribbean Sea	0	31	1	46	0.0× / 0.2
Other · English Channel	0	31	1	45	0.0× / 0.8
Surveys · Great Australian Bight	0	31	1	148	— / 0
Wrecks · Great Australian Bightlong running	0	31	1	417	— / 0

Cite: seahazards.com Sea Ledger, 2020-07, 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.