Sea Ledger, April 2001

2001-04-01 to 2001-04-30 · archive

issued: 382
warning-days in force: 5,943
in force at month end: 209
sea × type cells: 183

baseline: same month, previous 5 years (2000-04, 1999-04, 1998-04, 1997-04)

By type

type	issued	warning-days	in force at end
Cable ops	86	815.2	29
Incidents	54	556.1	22
Surveys	50	366	15
Nav aids	44	2,092.1	71
Exercises	44	357.9	10
Quakes	34	101.2	3
Other	24	390	17
Derelicts	17	105.6	1
Spills	8	121	5
Wrecks	6	825.9	30
Missiles	5	60	2
Ordnance	5	28.1	1
Icebergs	3	10.4	0
Containers	2	19	0
Volcanic	0	30	1
War risk	0	60	2
Mines	0	4.5	0

By sea and type · 183 cells, most issued first

cell	issued	warning-days	at end	longest d	vs 5 y
Cable ops · South Atlantic Oceansurge	42	110.1	3	37	2.5× / 17
Surveys · English Channelsurge	14	52.9	1	22	9.3× / 1.5
Surveys · Celtic Seasurge	13	21.4	0	—	3.5× / 3.75
Incidents · Indian Oceansurge	9	127.3	5	36	9.0× / 1
Cable ops · North Atlantic Ocean	9	107.5	4	88	1.2× / 7.75
Quakes · North Pacific Oceansurge	9	23.3	2	32	2.3× / 4
Surveys · South Atlantic Oceannew	7	36.1	0	—	new / 0
Incidents · North Pacific Ocean	6	66.9	3	58	1.6× / 3.75
Incidents · South Pacific Oceansurge	6	42.2	3	31	3.4× / 1.75
Exercises · Laccadive Seanew	6	41.6	2	21	new / 0
Exercises · North Atlantic Ocean	6	36.7	0	—	1.0× / 5.75
Cable ops · Celtic Sea	6	32.1	0	—	1.4× / 4.25
Incidents · South Atlantic Oceansurge	6	23.5	2	30	2.4× / 2.5
Quakes · South Pacific Ocean	6	19.1	1	31	0.7× / 8.75
Quakes · Solomon Seasurge	6	18	0	—	3.4× / 1.75
Cable ops · North Seasurge	6	17.8	2	12	2.2× / 2.75
Nav aids · English Channelsurge	5	87.5	3	196	2.2× / 2.25
Spills · Gulf of Mexicosurge	5	63	2	42	2.0× / 2.5
Missiles · North Pacific Ocean	5	60	2	34	1.8× / 2.75
Other · North Atlantic Oceansurge	5	53.1	3	121	2.5× / 2
Incidents · North Atlantic Oceansurge	5	29.2	1	54	2.0× / 2.5
Exercises · North Pacific Ocean	5	23	0	—	1.7× / 3
Quakes · Indian Oceansurge	5	15	0	—	2.5× / 2
Incidents · Coral Seasurge	5	6	1	28	4.0× / 1.25
Nav aids · South Pacific Oceansurge	4	252.9	10	360	8.0× / 0.5
Nav aids · North Atlantic Ocean	4	182.4	4	314	1.6× / 2.5
Exercises · Aegean Seasurge	4	107.7	3	118	4.0× / 1
Nav aids · Tyrrhenian Seasurge	4	58.8	3	74	3.2× / 1.25
Cable ops · South Pacific Oceansurge	4	43.6	0	—	16× / 0.25
Ordnance · Persian Gulfsurge	4	21.7	1	34	3.2× / 1.25
Nav aids · Coral Sealong running	3	185.4	6	565	1.2× / 2.5
Nav aids · South Atlantic Ocean	3	147.3	5	271	0.8× / 4
Cable ops · South China Seasurge	3	140.7	5	90	6.0× / 0.5
Surveys · North Atlantic Oceansurge	3	77.9	3	38	6.0× / 0.5
Incidents · South China Seasurge	3	73.2	1	59	6.0× / 0.5
Other · North Seasurgelong running	3	36.2	1	392	2.0× / 1.5
Incidents · Philippine Sea	3	32.3	1	30	1.1× / 2.75
Nav aids · Laccadive Seanew	3	24.1	2	79	new / 0
Exercises · Bay of Bengalsurge	3	23.6	0	—	6.0× / 0.5
Derelicts · Gulf of Mexiconew	3	19.1	0	—	new / 0
Cable ops · Irish Sea and St. George's Channel	3	12	0	—	1.2× / 2.5
Surveys · Irish Sea and St. George's Channelsurge	3	11.6	0	—	2.0× / 1.5
Exercises · Adriatic Sea	3	10.9	0	—	1.2× / 2.5
Exercises · Mediterranean Sea - Eastern Basinsurge	3	10.1	0	—	2.0× / 1.5
Exercises · Ligurian Seasurge	3	8	1	20	4.0× / 0.75
Exercises · Mediterranean Sea - Western Basinsurge	3	7.6	0	—	2.0× / 1.5
Nav aids · North Sealong running	2	183.3	5	406	0.3× / 6
Other · Japan Seanew	2	65.3	2	34	new / 0
Nav aids · Tasman Sea	2	35.1	2	362	2.7× / 0.75
Wrecks · South Atlantic Oceannew	2	30.9	2	45	new / 0
Spills · North Pacific Ocean	2	26	2	13	8.0× / 0.25
Other · Mediterranean Sea - Western Basinnew	2	25.2	1	26	new / 0
Nav aids · Celtic Sea	2	24.8	1	31	1.3× / 1.5
Nav aids · Bass Strait	2	20.7	0	—	4.0× / 0.5
Exercises · Black Sea	2	20.5	2	34	0.8× / 2.5
Derelicts · North Pacific Ocean	2	13.3	0	—	4.0× / 0.5
Exercises · Arabian Seanew	2	10.5	1	7	new / 0
Cable ops · Caribbean Sea	2	9.6	1	9	8.0× / 0.25
Derelicts · Tyrrhenian Seanew	2	9.3	1	27	new / 0
Derelicts · Indian Oceannew	2	8.9	0	—	new / 0
Cable ops · English Channel	2	7.1	1	18	1.0× / 2
Nav aids · Mediterranean Sea - Western Basin	2	6.6	0	—	8.0× / 0.25
Derelicts · Mediterranean Sea - Eastern Basin	2	6.5	0	—	8.0× / 0.25
Exercises · Tyrrhenian Sea	2	6.5	1	6	1.6× / 1.25
Quakes · Banda Sea	2	6	0	—	4.0× / 0.5
Quakes · Philippine Sea	2	6	0	—	0.9× / 2.25
Cable ops · Bristol Channel	2	3	0	—	4.0× / 0.5
Icebergs · North Atlantic Oceannew	2	2	0	—	new / 0
Incidents · Celtic Sea	2	0.8	0	—	8.0× / 0.25
Nav aids · Solomon Sea	1	89.6	3	109	new / 0
Incidents · Eastern China Sea	1	81.8	3	40	4.0× / 0.25
Cable ops · Arabian Sea	1	70.1	2	97	4.0× / 0.25
Cable ops · North Pacific Ocean	1	60	2	36	new / 0
Nav aids · Andaman or Burma Sea	1	56.2	2	90	new / 0
Cable ops · Bay of Bengal	1	54.5	2	40	new / 0
Surveys · North Sea	1	46.5	2	65	0.2× / 4.5
Other · South Atlantic Ocean	1	37.6	1	55	1.3× / 0.75
Nav aids · Inner Seas off the West Coast of Scotlandlong running	1	36.2	1	370	0.5× / 2
Other · Yellow Sea	1	33.9	1	32	new / 0
Nav aids · Singapore Strait	1	33.4	2	48	new / 0
Wrecks · Persian Gulf	1	32.2	1	91	4.0× / 0.25
Spills · North Atlantic Ocean	1	32	1	42	0.5× / 2
Nav aids · Persian Gulf	1	30.9	1	49	0.7× / 1.5
Wrecks · Malacca Strait	1	28.7	1	28	new / 0
Other · Persian Gulf	1	28	0	—	new / 0
Cable ops · Black Sea	1	19.6	1	19	new / 0
Incidents · Mediterranean Sea - Eastern Basin	1	19.5	0	—	1.3× / 0.75
Incidents · Arafura Sea	1	13.5	1	13	new / 0
Surveys · Persian Gulf	1	12.6	1	12	4.0× / 0.25
Derelicts · Philippine Sea	1	12.4	0	—	new / 0
Surveys · Ionian Sea	1	12	0	—	0.7× / 1.5
Exercises · Japan Sea	1	12	0	—	1.0× / 1
Nav aids · Great Australian Bight	1	11.2	1	11	new / 0
Wrecks · Tasman Sea	1	10.6	1	10	new / 0
Derelicts · Timor Sea	1	9.9	0	—	new / 0
Exercises · South Atlantic Ocean	1	9.6	0	—	2.0× / 0.5
Surveys · Inner Seas off the West Coast of Scotland	1	9	1	9	new / 0
Icebergs · South Atlantic Ocean	1	8.4	0	—	0.6× / 1.75
Derelicts · Coral Sea	1	6.9	0	—	new / 0
Containers · Bay of Biscay	1	6.7	0	—	new / 0
Derelicts · Mediterranean Sea - Western Basin	1	6.6	0	—	new / 0
Surveys · Ligurian Sea	1	6.4	1	6	new / 0
Derelicts · North Atlantic Ocean	1	6.4	0	—	4.0× / 0.25
Containers · Ligurian Sea	1	6.3	0	—	new / 0
Derelicts · South China Sea	1	6.3	0	—	new / 0
Other · South Pacific Ocean	1	5.7	1	30	new / 0
Cable ops · Philippine Sea	1	5.6	1	5	4.0× / 0.25
Surveys · Philippine Sea	1	5.6	1	5	new / 0
Ordnance · Philippine Sea	1	5	0	—	new / 0
Quakes · South Atlantic Ocean	1	4.8	0	—	0.8× / 1.25
Other · Arabian Sea	1	4.5	1	4	new / 0
Surveys · Eastern China Sea	1	3.5	1	3	new / 0
Nav aids · Indian Ocean	1	3.5	0	—	new / 0
Wrecks · Mediterranean Sea - Western Basin	1	3.5	1	3	new / 0
Incidents · North Sea	1	3.5	1	3	new / 0
Other · Tasman Sea	1	3.4	1	3	new / 0
Quakes · Bismarck Sea	1	3	0	—	1.3× / 0.75
Quakes · Coral Sea	1	3	0	—	0.2× / 4.5
Cable ops · Inner Seas off the West Coast of Scotland	1	3	1	2	0.8× / 1.25
Quakes · South China Sea	1	3	0	—	4.0× / 0.25
Nav aids · Arabian Sea	1	2.9	0	—	4.0× / 0.25
Surveys · South China Sea	1	2.9	1	2	4.0× / 0.25
Cable ops · Tasman Sea	1	2.9	1	2	new / 0
Incidents · Solomon Sea	1	2.7	0	—	4.0× / 0.25
Surveys · Bristol Channel	1	2.6	1	2	0.7× / 1.5
Other · Inner Seas off the West Coast of Scotland	1	2	1	2	4.0× / 0.25
Other · Ligurian Sea	1	1.8	0	—	new / 0
Other · Celtic Sea	1	1.6	0	—	new / 0
Incidents · Bay of Biscay	1	1	0	—	new / 0
Other · Philippine Sea	1	1	0	—	new / 0
Incidents · Southern Ocean	1	0.9	0	—	new / 0
Other · North Pacific Ocean	1	0.5	0	—	2.0× / 0.5
Other · Indian Ocean	1	0.2	1	0	4.0× / 0.25
Incidents · Great Australian Bight	1	0	0	—	2.0× / 0.5
Surveys · Gulf of Suez	1	0	0	—	new / 0
Incidents · Tasman Sea	1	0	0	—	4.0× / 0.25
Nav aids · Mozambique Channel	0	120	4	263	— / 0
Wrecks · Coral Sea	0	90	3	336	— / 0
Nav aids · North Pacific Ocean	0	90	3	180	0.0× / 0.25
Wrecks · South China Sealong running	0	90	3	468	— / 0
Wrecks · Tyrrhenian Sealong running	0	90	3	921	— / 0
Wrecks · English Channellong running	0	60	2	670	— / 0
Nav aids · Irish Sea and St. George's Channel	0	60	2	362	0.0× / 1.25
Wrecks · North Sealong running	0	60	2	421	— / 0
Cable ops · Persian Gulf	0	60	2	203	— / 0
War risk · Persian Gulf	0	60	2	88	— / 0
Wrecks · South Pacific Ocean	0	60	2	360	— / 0
Cable ops · Mediterranean Sea - Eastern Basin	0	56	1	74	0.0× / 1.25
Nav aids · Malacca Straitlong running	0	49.3	1	563	— / 0
Nav aids · Adriatic Sealong running	0	30	1	769	— / 0
Other · Adriatic Sea	0	30	1	361	0.0× / 0.75
Surveys · Adriatic Sea	0	30	1	47	0.0× / 0.5
Wrecks · Adriatic Sealong running	0	30	1	441	— / 0
Wrecks · Arabian Sea	0	30	1	214	— / 0
Wrecks · Baltic Sea	0	30	1	122	— / 0
Nav aids · Bay of Bengallong running	0	30	1	573	— / 0
Wrecks · Bay of Biscay	0	30	1	163	— / 0
Nav aids · Bering Sea	0	30	1	31	— / 0
Nav aids · Bristol Channel	0	30	1	31	0.0× / 0.5
Nav aids · Caribbean Sea	0	30	1	360	0.0× / 0.5
Nav aids · Eastern China Sea	0	30	1	189	— / 0
Other · Greenland Sea	0	30	1	250	— / 0
Nav aids · Gulf of Mexico	0	30	1	341	0.0× / 1
Wrecks · Irish Sea and St. George's Channel	0	30	1	301	— / 0
Wrecks · Kattegat	0	30	1	70	0.0× / 0.25
Surveys · Mediterranean Sea - Western Basin	0	30	1	112	0.0× / 0.5
Wrecks · North Atlantic Oceanlong running	0	30	1	692	— / 0
Nav aids · Red Sea	0	30	1	168	— / 0
Wrecks · Red Sea	0	30	1	356	— / 0
Wrecks · Skagerrak	0	30	1	173	— / 0
Other · South China Sealong running	0	30	1	615	— / 0
Volcanic · South Pacific Ocean	0	30	1	97	— / 0
Nav aids · Sulu Sea	0	30	1	108	— / 0
Nav aids · Timor Sealong running	0	30	1	461	— / 0
Exercises · Malacca Strait	0	29.6	0	—	— / 0
Incidents · Black Sea	0	26.4	0	—	— / 0
Containers · Persian Gulf	0	6	0	—	— / 0
Incidents · Tyrrhenian Sea	0	5.4	0	—	— / 0
Surveys · Aegean Sea	0	5	0	—	0.0× / 0.25
Mines · North Sea	0	4.5	0	—	— / 0
Ordnance · Norwegian Sea	0	1.4	0	—	0.0× / 0.25
Cable ops · Eastern China Sea	0	0	0	—	0.0× / 1
Surveys · Sulu Sea	0	0	0	—	— / 0

Cite: seahazards.com Sea Ledger, 2001-04, 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.