Sea Ledger, September 2019

2019-09-01 to 2019-09-30 · archive

issued: 771
warning-days in force: 12,000
in force at month end: 382
sea × type cells: 242

baseline: same month, previous 5 years (2018-09, 2017-09, 2016-09, 2015-09, 2014-09)

By type

type	issued	warning-days	in force at end
Exercises	201	1,830.3	56
Incidents	117	1,064.9	28
Surveys	87	2,383.1	86
Icebergs	86	97.2	5
Nav aids	55	2,669.1	82
Missiles	48	429.6	11
Other	37	511.9	14
Quakes	32	96.8	2
Cable ops	31	507.7	16
Derelicts	29	209.7	7
Storms	13	8.2	0
Wrecks	12	1,800.3	61
Spills	11	143	6
Debris	3	7.4	1
Volcanic	2	41.4	2
Restricted	2	147.2	3
Piracy	2	7.7	1
Structures	1	32.4	1
Ordnance	1	9.1	0
Containers	1	3	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	49	299.4	9	333	7.0× / 7
Incidents · South China Sea	31	263.2	8	36	1.4× / 22.6
Icebergs · South Atlantic Ocean	31	30.9	1	30	1.8× / 17.2
Icebergs · Labrador Sea	29	35	2	31	1.1× / 25.6
Exercises · North Pacific Ocean	27	207.4	11	34	1.0× / 27.2
Other · North Pacific Oceansurge	25	88.1	3	54	125× / 0.2
Exercises · Black Seasurge	24	397.6	6	49	2.1× / 11.6
Icebergs · Southern Oceansurge	23	22.9	1	30	3.6× / 6.4
Surveys · South Atlantic Oceansurge	19	352.2	10	85	2.5× / 7.6
Incidents · North Pacific Ocean	17	189.8	2	39	0.6× / 28.4
Exercises · Aegean Seasurge	15	223.7	16	276	2.3× / 6.4
Exercises · Philippine Seasurge	14	22.8	0	—	4.7× / 3
Storms · North Atlantic Oceansurge	13	8.2	0	—	5.9× / 2.2
Missiles · North Pacific Oceanlong running	12	109.2	3	563	1.1× / 10.4
Missiles · Barentsz Seasurge	12	77.2	2	35	2.1× / 5.6
Exercises · South Pacific Ocean	12	73.4	1	31	1.9× / 6.2
Surveys · North Atlantic Oceansurgelong running	11	580.8	19	683	2.5× / 4.4
Surveys · Persian Gulfsurge	11	229.2	9	125	14× / 0.8
Quakes · South Pacific Ocean	11	34.3	1	30	0.6× / 20
Incidents · Arabian Seasurge	10	123	5	41	5.6× / 1.8
Cable ops · North Atlantic Ocean	9	95.7	3	38	1.6× / 5.6
Exercises · South Atlantic Ocean	9	76.9	0	—	0.7× / 12.2
Incidents · South Atlantic Ocean	9	37.8	1	29	1.3× / 7
Exercises · Arabian Sea	8	63.7	3	33	1.3× / 6.4
Exercises · North Atlantic Ocean	8	62.3	4	31	0.8× / 10.6
Surveys · Mediterranean Sea - Eastern Basin	7	147	6	84	1.4× / 5.2
Exercises · Bay of Bengal	7	111.8	0	—	0.7× / 9.4
Spills · Gulf of Mexico	7	70	4	27	1.4× / 5
Exercises · Yellow Sea	7	35.3	1	31	0.9× / 7.6
Nav aids · North Atlantic Ocean	6	237.4	6	326	1.1× / 5.2
Surveys · North Sea	6	131.7	5	89	1.8× / 3.4
Nav aids · Indian Oceansurge	6	123	4	179	3.3× / 1.8
Exercises · South China Sea	6	22.6	0	—	1.0× / 6.2
Missiles · North Atlantic Ocean	6	15.4	0	—	1.1× / 5.6
Surveys · Sea of Okhotsksurge	5	209.2	7	255	8.3× / 0.6
Incidents · North Atlantic Ocean	5	159.3	2	70	0.4× / 14
Missiles · Black Sea	5	124.9	3	33	1.2× / 4.2
Exercises · Andaman or Burma Seasurge	5	71.2	1	31	13× / 0.4
Nav aids · Bay of Bengalsurge	5	52.3	3	48	5.0× / 1
Incidents · South Pacific Ocean	5	45	0	—	0.7× / 7.2
Incidents · Indian Ocean	5	29.2	0	—	0.8× / 6.2
Incidents · Mediterranean Sea - Eastern Basin	5	14.4	2	7	0.3× / 15.6
Incidents · Coral Sea	5	2.9	0	—	0.9× / 5.8
Nav aids · South Atlantic Ocean	4	474.4	14	195	0.4× / 9.6
Exercises · Laccadive Seasurge	4	42.5	1	31	2.9× / 1.4
Derelicts · Indian Ocean	4	39.4	2	54	0.9× / 4.2
Cable ops · North Sea	4	35.1	1	142	0.7× / 6
Surveys · Andaman or Burma Seasurge	4	33.2	2	54	6.7× / 0.6
Missiles · South Pacific Oceansurge	4	18.3	0	—	2.5× / 1.6
Derelicts · Bay of Bengalsurge	4	14.1	1	29	2.0× / 2
Derelicts · South Atlantic Oceansurge	4	12	0	—	3.3× / 1.2
Quakes · Philippine Sea	4	10.9	1	20	1.7× / 2.4
Incidents · Bismarck Seasurge	4	7.6	1	17	10× / 0.4
Wrecks · South China Seasurge	3	532.8	19	266	7.5× / 0.4
Nav aids · Caribbean Sealong running	3	257.1	6	601	0.9× / 3.2
Nav aids · North Sea	3	182.6	5	66	0.3× / 8.8
Nav aids · South Pacific Ocean	3	179.8	7	329	1.4× / 2.2
Nav aids · North Pacific Ocean	3	166.9	6	216	0.7× / 4.6
Surveys · South China Sea	3	97.5	4	56	1.4× / 2.2
Surveys · Kara Sea	3	89.8	3	83	1.7× / 1.8
Nav aids · Coral Sea	3	61.7	2	97	0.8× / 4
Incidents · Caribbean Sea	3	53	1	23	0.4× / 7.4
Spills · North Atlantic Ocean	3	52	1	33	1.1× / 2.8
Nav aids · Arabian Seasurge	3	41.5	2	181	3.0× / 1
Cable ops · Strait of Gibraltarsurge	3	35.2	1	23	15× / 0.2
Cable ops · South Atlantic Ocean	3	16.1	0	—	0.8× / 3.8
Quakes · Banda Seasurge	3	9	0	—	15× / 0.2
Quakes · Java Seasurge	3	9	0	—	15× / 0.2
Quakes · North Atlantic Oceansurge	3	9	0	—	5.0× / 0.6
Surveys · Norwegian Sea	2	118.8	4	145	2.5× / 0.8
Wrecks · Arabian Sea	2	67.3	3	245	2.5× / 0.8
Derelicts · South China Sea	2	63.8	2	90	2.5× / 0.8
Surveys · Barentsz Sea	2	56.1	3	80	1.7× / 1.2
Other · North Atlantic Ocean	2	47.6	0	—	1.1× / 1.8
Wrecks · The Northwestern Passages	2	39.3	1	42	1.3× / 1.6
Surveys · Black Sea	2	39	2	26	0.9× / 2.2
Nav aids · Great Australian Bight	2	32.1	1	40	1.0× / 2
Cable ops · Tasman Seanew	2	29.1	0	—	new / 0
Cable ops · Indian Ocean	2	29	1	28	3.3× / 0.6
Nav aids · Arafura Sea	2	28.2	1	27	2.5× / 0.8
Nav aids · English Channel	2	14.6	0	—	0.7× / 3
Missiles · Chukchi Seanew	2	13.8	0	—	new / 0
Incidents · Celebes Seanew	2	13.1	1	18	new / 0
Missiles · Arctic Ocean	2	12.8	0	—	3.3× / 0.6
Nav aids · Celtic Sea	2	11.4	0	—	1.0× / 2
Incidents · Laccadive Sea	2	11.3	2	9	1.7× / 1.2
Surveys · Sea of Marmara	2	8.6	2	5	10× / 0.2
Quakes · North Pacific Ocean	2	6.6	0	—	0.3× / 7.8
Derelicts · Arabian Sea	2	6	0	—	3.3× / 0.6
Quakes · Indian Ocean	2	6	0	—	1.3× / 1.6
Derelicts · Mediterranean Sea - Eastern Basin	2	6	0	—	2.0× / 1
Derelicts · North Atlantic Ocean	2	6	0	—	0.7× / 2.8
Exercises · Red Sea	2	6	0	—	3.3× / 0.6
Icebergs · Kara Sea	2	5.4	1	24	0.7× / 2.8
Nav aids · Irish Sea and St. George's Channel	2	4.8	0	—	0.5× / 4.2
Missiles · Laccadive Sea	2	4.8	1	17	1.4× / 1.4
Other · Gulf of Alaska	2	4.3	0	—	10× / 0.2
Incidents · Tasman Sea	2	1.6	1	24	1.7× / 1.2
Other · South Pacific Oceannew	2	0.3	0	—	new / 0
Wrecks · North Atlantic Oceanlong running	1	180.3	6	697	1.3× / 0.8
Wrecks · South Pacific Ocean	1	99.8	3	298	1.0× / 1
Nav aids · Mediterranean Sea - Western Basin	1	94.2	4	242	5.0× / 0.2
Cable ops · North Pacific Ocean	1	58	1	41	new / 0
Wrecks · Laccadive Sea	1	57.1	2	210	new / 0
Cable ops · South China Sea	1	47.9	2	165	0.4× / 2.4
Cable ops · Persian Gulf	1	40.1	1	97	2.5× / 0.4
Derelicts · South Pacific Ocean	1	33	1	31	0.6× / 1.6
Nav aids · Aegean Sea	1	31.7	1	181	new / 0
Surveys · Arabian Sea	1	31.5	1	52	0.6× / 1.6
Wrecks · South Atlantic Ocean	1	31	1	178	2.5× / 0.4
Surveys · Bay of Bengal	1	30	1	39	0.6× / 1.6
Surveys · Bering Sea	1	30	1	178	5.0× / 0.2
Volcanic · South Pacific Ocean	1	30	1	34	new / 0
Surveys · Laptev Sea	1	26.6	1	26	5.0× / 0.2
Cable ops · Adriatic Sea	1	24.4	1	24	new / 0
Spills · North Pacific Ocean	1	21	1	37	0.7× / 1.4
Incidents · Halmahera Sea	1	20.5	0	—	5.0× / 0.2
Incidents · Andaman or Burma Sea	1	19	0	—	2.5× / 0.4
Exercises · Norwegian Sea	1	17	0	—	5.0× / 0.2
Other · North Sea	1	16.4	0	—	0.8× / 1.2
Incidents · Bay of Bengal	1	15.2	0	—	0.8× / 1.2
Derelicts · Coral Sea	1	13.8	0	—	2.5× / 0.4
Cable ops · South Pacific Ocean	1	13.5	1	13	new / 0
Cable ops · Coral Sea	1	12.9	1	12	new / 0
Missiles · Japan Sea	1	12	0	—	new / 0
Volcanic · Mozambique Channel	1	11.4	1	11	new / 0
Incidents · Bering Sea	1	10.3	1	10	1.7× / 0.6
Surveys · Indian Ocean	1	9.8	1	9	1.3× / 0.8
Ordnance · North Pacific Ocean	1	9.1	0	—	5.0× / 0.2
Other · Laccadive Sea	1	8.6	1	41	new / 0
Surveys · Caribbean Sea	1	8.2	1	8	0.5× / 2
Exercises · Adriatic Sea	1	8.1	0	—	2.5× / 0.4
Surveys · Greenland Sea	1	8	0	—	new / 0
Missiles · Arabian Sea	1	7	0	—	1.0× / 1
Piracy · Sulu Sea	1	6.5	1	6	new / 0
Cable ops · Gulf of Guinea	1	6.2	1	6	2.5× / 0.4
Incidents · Ceram Sea	1	6.1	0	—	5.0× / 0.2
Incidents · Black Sea	1	5.4	0	—	new / 0
Incidents · Solomon Sea	1	5.4	1	5	0.6× / 1.6
Wrecks · North Sea	1	5.2	1	5	1.7× / 0.6
Nav aids · The Coastal Waters of Southeast Alaska and British Columbia	1	5.1	1	5	0.3× / 3
Incidents · Persian Gulf	1	4.7	0	—	5.0× / 0.2
Cable ops · Philippine Sea	1	4.4	1	4	1.3× / 0.8
Other · Java Sea	1	4.3	0	—	new / 0
Surveys · Aegean Sea	1	3.9	0	—	2.5× / 0.4
Incidents · Java Sea	1	3.5	0	—	0.6× / 1.8
Exercises · Mediterranean Sea - Western Basin	1	3.5	1	3	5.0× / 0.2
Quakes · Adriatic Sea	1	3	0	—	new / 0
Restricted · Caribbean Sea	1	3	0	—	new / 0
Other · Celtic Sea	1	3	0	—	2.5× / 0.4
Quakes · Coral Sea	1	3	0	—	1.3× / 0.8
Quakes · Halmahera Sea	1	3	0	—	new / 0
Derelicts · Japan Sea	1	3	0	—	0.8× / 1.2
Derelicts · Laccadive Sea	1	3	0	—	1.7× / 0.6
Icebergs · Laptev Sea	1	3	0	—	0.2× / 4.4
Derelicts · Mediterranean Sea - Western Basin	1	3	0	—	1.0× / 1
Debris · North Atlantic Ocean	1	3	0	—	0.4× / 2.4
Derelicts · North Sea	1	3	0	—	new / 0
Quakes · Sea of Marmara	1	3	0	—	new / 0
Containers · Tasman Sea	1	3	0	—	new / 0
Derelicts · Tasman Sea	1	3	0	—	1.7× / 0.6
Debris · Timor Sea	1	3	0	—	5.0× / 0.2
Other · Timor Sea	1	3	0	—	new / 0
Restricted · Indian Ocean	1	2.8	0	—	new / 0
Structures · South Atlantic Ocean	1	2.4	0	—	new / 0
Nav aids · Bristol Channel	1	2.3	0	—	5.0× / 0.2
Surveys · Bass Strait	1	1.9	1	1	new / 0
Exercises · Gulf of Thailand	1	1.8	0	—	new / 0
Nav aids · Singapore Strait	1	1.5	1	1	new / 0
Debris · Indian Ocean	1	1.4	1	1	5.0× / 0.2
Other · Mediterranean Sea - Eastern Basin	1	1.3	0	—	1.7× / 0.6
Nav aids · Beaufort Sea	1	1.2	0	—	new / 0
Piracy · Red Sea	1	1.2	0	—	new / 0
Incidents · Malacca Strait	1	1	0	—	2.5× / 0.4
Missiles · Bay of Bengal	1	0.5	1	0	1.0× / 1
Incidents · Makassar Strait	1	0.4	0	—	new / 0
Derelicts · Gulf of Tomini	1	0.3	0	—	new / 0
Derelicts · North Pacific Ocean	1	0.3	1	0	0.5× / 2.2
Incidents · Timor Sea	1	0.1	0	—	2.5× / 0.4
Surveys · Great Australian Bight	1	0	0	—	new / 0
Wrecks · Caribbean Sealong running	0	210	7	973	0.0× / 0.8
Nav aids · Mozambique Channel	0	120	4	207	— / 0
Other · Caribbean Sealong running	0	95.5	3	983	— / 0
Nav aids · Gulf of Mexico	0	93	1	336	0.0× / 5
Other · Arabian Sea	0	90	3	246	0.0× / 0.2
Wrecks · North Pacific Oceanlong running	0	90	3	836	0.0× / 0.2
Nav aids · Philippine Sea	0	90	3	208	0.0× / 0.2
Wrecks · Sea of Okhotsk	0	90	3	81	— / 0
Nav aids · Andaman or Burma Sea	0	60	2	157	0.0× / 0.6
Wrecks · Andaman or Burma Sea	0	60	2	73	— / 0
Wrecks · Gulf of Mexicolong running	0	60	2	928	0.0× / 0.2
Exercises · Ionian Sea	0	60	2	276	0.0× / 0.2
Nav aids · Mediterranean Sea - Eastern Basin	0	60	2	89	0.0× / 0.2
Restricted · Persian Gulf	0	59.4	1	166	0.0× / 0.2
Nav aids · Hudson Bay	0	49.7	0	—	— / 0
Missiles · Aegean Sea	0	30	1	276	0.0× / 0.4
Surveys · Arctic Ocean	0	30	1	55	0.0× / 1.2
Nav aids · Bass Strait	0	30	1	187	0.0× / 0.4
Surveys · Beaufort Sea	0	30	1	55	0.0× / 0.4
Restricted · Black Sea	0	30	1	49	0.0× / 0.4

Cite: seahazards.com Sea Ledger, 2019-09, 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.