GMDSS気象ブリテン
Scheduled meteorological broadcast issued via NAVTEX, HF, MF or satellite under the Global Maritime Distress and Safety System.
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Meteorology
Browse Meteorology terms for maritime professionals.
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METAREA予報要求
Vessel’s formal demand via GMDSS for the latest meteorological forecast for a specific NAVAREA/METAREA region.
View termVOC管理手順
Shipboard plan to minimise Volatile Organic Compound emissions during loading, voyage and discharge of crude oil cargoes per IMO Resolution 1088(28).
View termうねり方向報告
Statement giving the dominant direction, height and period of the prevailing ocean swell for route planning and seakeeping.
View termごみ排出記録
A mandatory logbook entry or record made by the ship to document every instance of garbage discharge or disposal at sea or at port, as required by MARPOL regulations.
View termもや発生注意報
An official advisory indicating that atmospheric conditions are favorable for mist development, which may lower visibility and affect navigation safety.
View termもや観測報告
A message reporting reduced visibility due to haze, specifying affected areas and visibility range, commonly issued for safety in coastal and open sea zones.
View termエネルギー効率指数
Calculated parameter (EEXI/EEOI) expressing CO₂ emitted per transport work, mandatory under IMO MARPOL Annex VI.
View termグローラー氷警報
Alert indicating presence of small, dense glacial ice blocks (growlers) scarcely visible above water, posing collision risk.
View termサイクロン警報
Official alert issued when a tropical cyclone with gale-force winds is expected to affect a maritime area within 24 hours.
View termスコールライン警報
Notification that organised line of squalls with gusts ≥ 34 kn is approaching, often ahead of cold front.
View termハリケーンフォース風
Wind of Beaufort scale 12 (≥ 64 kn) producing phenomenal seas; reported in Metarea bulletins as force 12.
View termハリケーン警報
A formal announcement by maritime or meteorological authorities indicating that hurricane conditions, including very high winds and heavy seas, are expected in the area.
View termバイオファウリング管理計画
A documented system required by IMO for vessels to manage and minimize the accumulation of aquatic organisms on hulls and submerged structures.
View termバラスト水交換
Operation of replacing loaded ballast with mid-ocean water at prescribed distance from land to prevent bio-invasion, logged under IMO BWM Convention.
View termバーギービット報告
An official communication or broadcast of the sighting and position of medium-sized floating ice fragments (bergy bits), especially in northern sea routes.
View termホワイトアウト警報
A warning indicating that visual navigation is severely hindered due to uniformly diffuse light caused by snow, ice, or fog, often resulting in total loss of horizon distinction.
View termラジオファクス図受信
Confirmation that a complete facsimile weather chart has been successfully received via HF radio and is ready for navigation use.
View term低気圧域
A meteorological region where atmospheric pressure is lower than surrounding areas, often associated with unsettled weather, strong winds, and possible cyclonic activity affecting maritime operations.
View term前線通過警報
A formal advisory issued by maritime authorities warning vessels of an approaching frontal system likely to bring sudden changes in wind, temperature, and visibility conditions.
View term台風警報
Highest-level tropical-cyclone warning issued by JMA or PAGASA for winds ≥64 kt, heavy seas and extreme storm surge threatening coastal and open-sea areas.
View term地上気圧図
Synoptic weather map depicting isobars and pressure systems at mean sea level, used for routeing decisions.
View term大雨警報
GMDSS meteorological message signalling precipitation rate ≥ 50 mm in 6 h, causing reduced visibility and risk of runoff.
View term大雪警報
Forecast advising imminent heavy snowfall reducing visibility below 0.5 nm and affecting mooring or channel transit.
View term寒冷前線接近
A message or forecast that a cold front is moving into the operational area, often accompanied by abrupt wind shift, falling temperatures, and changing sea state.
View term寒波警報
An official warning issued to inform mariners of an expected period of unusually low temperatures, which may affect vessel systems and crew safety.
View term引き潮予測
Tabulated forecast time and rate of falling tide current used for harbour passage planning.
View term強烈暴風警報
Official GMDSS warning message indicating winds ≥ Beaufort 10, heavy seas and reduced visibility within forecast area.
View term強風警報
A warning issued to mariners when sustained winds of Beaufort Force 8 or higher (34–40 knots) are expected or occurring in the area.
View term排出規制海域
Designated sea region where MARPOL Annex VI limits on SOx, NOx and PM apply; requires low-sulphur fuel or equivalent abatement.
View term暴風警報
A formal notification from maritime or meteorological authorities indicating strong winds, heavy seas, and potentially hazardous conditions are expected in the designated area.
View term暴風警報信号
An official maritime signal indicating imminent or present severe gale conditions (Beaufort Force 9–10) requiring vessels to secure for heavy weather.
View term気圧傾向報告
Synoptic code group summarising rate and character of atmospheric pressure change during past three hours, broadcast in SHIP and METAR messages.
View term気圧報告
Regularly transmitted statement of current atmospheric pressure and trend for meteorological data exchange and storm tracking.
View term気象符号報告
A standardized numerical weather message (per WMO/IMO) reporting synoptic-scale observations, transmitted by ships for meteorological analysis and forecasting.
View term水上竜巻警報
An official maritime bulletin advising of the risk of waterspout formation in a specific sea area, requiring heightened lookout and precautionary measures.
View term氷圧リッジ警報
A notice regarding the formation or presence of elevated ice ridges on sea ice, which may pose navigational hazards to vessels in polar waters.
View term氷山漂流予報
A prediction of the future movement and position of icebergs in a given maritime area, based on meteorological and oceanographic data, issued to assist in safe navigation.
View term氷着スプレー警報
GMDSS meteorological warning that sea spray will freeze on exposed surfaces causing topside icing hazards.
View term氷縁報告
Update giving the geographic position of the ice edge separating open water from pack ice, critical for polar routing.
View term氷雨警報
GMDSS forecast message indicating super-cooled rain likely to freeze on contact, causing rapid ice accretion on decks and rigging.
View term汚染対策訓練
Planned harbour drill simulating oil-spill response, including boom deployment, skimmer operation and multi-agency communications testing.
View term油流出警報
Immediate notification that mineral oil is observed on sea surface requiring containment and reporting under MARPOL 73/78.
View term沿岸定着氷拡大
Rapid seaward growth of shore-fast ice, restricting manoeuvring space and increasing risk of besetment for vessels.
View term沿岸流警報
Official notice to mariners about significant changes, hazards, or anomalies in coastal water currents affecting safe navigation.
View term波高注意報
A warning issued to vessels regarding anticipated significant wave heights exceeding safe operating limits.
View term流氷漂移予報
Forecast of movement and speed of pack or floe ice issued by ice service for route planning.
View term海氷集中度
A measure (usually in tenths) of the area of a sea region covered by ice, provided in ice bulletins to support safe navigation and routing.
View term海況報告
Periodic description of significant wave height, period and swell state transmitted for routing and safety assessments.
View term海洋ごみ報告
A report made to authorities or VTS regarding observed floating or drifting marine debris that may pose a hazard to navigation.
View term海洋熱含有量
Measure of thermal energy stored in the upper ocean layers, used to assess cyclone potential and climate trends.
View term海洋観測データ報告
A formal report or transmission containing oceanographic data such as temperature, salinity, current, and sea state, as collected by shipboard sensors or via official request.
View term海霧警報
Notice that horizontal visibility at sea will fall below one kilometre due to advection or radiation fog.
View term海面水温
Measured or satellite-derived temperature of ocean top centimetre, critical for routing, icing and cyclogenesis forecasts.
View term温室効果ガスインベントリ
Comprehensive report of CO₂, CH₄ and N₂O emissions from vessel operations for regulatory compliance and environmental management.
View term温暖前線接近
Indication that a warm air mass front is advancing toward the vessel’s area, typically bringing steady rain and veering winds.
View term満潮予測
Forecast information regarding the timing and height of the next incoming (flood) tide, crucial for safe navigation and berthing operations.
View term潮流更新
New information on rate and set of tidal current issued by VTS or hydrographic authority for local area.
View term濃霧注意報
Warning issued when visibility expected below one-half nautical mile due to thick fog, requiring sound signals and speed reduction.
View term熱帯暴風警報
An official advisory issued to warn vessels that a tropical storm may affect the area within 48 hours. Mariners should closely monitor forecasts and prepare for possible severe weather.
View term熱波監視
Pre-warning by meteorological authority that sustained high air temperatures are likely within 48 h, possibly affecting crew endurance, vessel machinery and cargo.
View term環境影響通知
Formal notification detailing projected ecological effects of vessel operations or construction works, issued for regulatory approval.
View term着氷警報
Notice that superstructure icing rate exceeds 2 cm h⁻¹ due to freezing precipitation or spray, requiring anti-icing measures.
View term着氷霧警報
An advisory issued to warn vessels of freezing fog conditions, which may cause ice accumulation on decks, equipment, and navigation structures.
View term砕氷警報
Message issued by ice services or VTS indicating dangerous concentrations of brash ice likely to impede manoeuvring or clog sea intakes.
View term船舶気象観測
Recorded meteorological observations from ships, submitted to authorities or meteorological agencies for forecasting and safety.
View term表層流警報
Official MSI or VHF message advising mariners that abnormally strong or variable surface currents exist in a defined area and may affect safe navigation.
View term視程低下警報
A formal alert issued to vessels when fog, mist, precipitation, or other factors are expected to lower visibility below safe navigation thresholds.
View term豪雨警報
An official advisory issued to warn of intense and prolonged rainfall that may severely reduce visibility and increase risk of flooding and navigation hazards.
View term閉塞前線警報
Notification that a mature occluded front will pass the vessel’s vicinity, often associated with variable winds and squally showers.
View term防汚塗料検査
Port state or class survey checking hull coating compliance with IMO AFS Convention and assessing biological growth.
View term雷活動警報
Alert issued when frequent cloud-to-ground or cloud-to-cloud lightning poses immediate risk to deck personnel and sensitive equipment.
View term雷雨予報
Prognostic bulletin giving probability, timing and movement of convective cells within shipping area.
View term霧域注意報
Notice to mariners of localised fog banks that may suddenly reduce visibility and require speed reduction or additional lookout.
View term風向報告
An official meteorological report or observation stating the current direction from which the wind is blowing, vital for navigation and maneuvering.
View term騒音低減手順
Harbour authority directive requiring vessels to minimise machinery and whistle noise, especially at night, to protect nearby communities and sensitive wildlife.
View term高気圧稜線
An elongated area of high atmospheric pressure, typically associated with calm weather and stable sea conditions.
View term高潮注意情報
Warning that abnormal sea-level rise due to cyclonic surge is expected in coastal area, requiring preventive mooring and evacuation measures.
View term高潮警報
An official alert issued to vessels regarding an abnormally high rise of sea level due to meteorological effects, especially during storms.
View term