Weather Forecasting and Oceanography
Expert-defined terms from the Postgraduate Certificate in Vessel Traffic Services course at London School of Planning and Management. Free to read, free to share, paired with a globally recognised certification pathway.
Weather Forecasting #
Weather Forecasting
Weather forecasting is the process of predicting the state of the atmosphere at… #
It involves analyzing current weather data, such as temperature, humidity, wind speed, and air pressure, to make educated guesses about future weather conditions. This information is crucial for various industries, including aviation, agriculture, and maritime operations, as it helps them plan their activities accordingly.
Atmospheric Pressure #
Atmospheric Pressure
Atmospheric pressure, also known as barometric pressure, is the force exerted by… #
It is measured in units of pressure, such as millibars or inches of mercury, and can affect weather patterns. High atmospheric pressure typically brings clear skies and calm weather, while low pressure can result in stormy conditions.
Beaufort Scale #
Beaufort Scale
The Beaufort Scale is a system used to estimate wind speeds based on observed co… #
It ranges from 0 (calm) to 12 (hurricane-force winds) and is often used by sailors, meteorologists, and Vessel Traffic Services (VTS) operators to describe wind intensity. For example, a wind speed of 25-31 knots corresponds to Beaufort Force 7, which is categorized as a near gale.
Climate #
Climate
Climate refers to the long #
term patterns of temperature, humidity, precipitation, and other atmospheric conditions in a specific region. It is different from weather, which describes short-term fluctuations in the atmosphere. Understanding climate trends is essential for predicting future weather patterns and making informed decisions about resource management and disaster preparedness.
Cyclone #
Cyclone
A cyclone is a large #
scale weather system characterized by low pressure at its center. Cyclones can be tropical (e.g., hurricanes and typhoons) or extratropical (e.g., mid-latitude cyclones). They are often associated with strong winds, heavy rainfall, and storm surges, making them hazardous for maritime activities. VTS operators must monitor cyclones closely to ensure the safety of vessels in affected areas.
Dew Point #
Dew Point
The dew point is the temperature at which air becomes saturated with water vapor… #
It is a critical parameter for assessing humidity levels and predicting the likelihood of fog, precipitation, and other weather phenomena. For example, if the dew point is close to the air temperature, the relative humidity is high, indicating a high likelihood of rain.
Front #
Front
A front is a boundary between two air masses with different temperatures and hum… #
Fronts can be cold, warm, stationary, or occluded, depending on the movement of the air masses involved. They often trigger changes in weather conditions, such as thunderstorms, rain, or snow. Understanding fronts is essential for weather forecasting and predicting severe weather events.
Hurricane #
Hurricane
A hurricane is a large, rotating storm system with low pressure at its center, t… #
Hurricanes are characterized by strong winds exceeding 74 mph (119 km/h) and heavy rainfall, making them one of the most powerful and destructive weather phenomena. VTS operators must closely monitor hurricanes to ensure the safety of vessels in affected areas.
Jet Stream #
Jet Stream
The jet stream is a narrow, fast #
flowing air current in the upper atmosphere, typically located at the boundary between warm and cold air masses. Jet streams can reach speeds of over 100 mph (161 km/h) and play a crucial role in shaping weather patterns around the world. Pilots and meteorologists use jet stream forecasts to plan flight routes and predict weather conditions.
Knot #
Knot
A knot is a unit of speed equal to one nautical mile per hour #
It is commonly used in maritime and aviation contexts to measure the speed of vessels or aircraft. For example, if a ship is traveling at 10 knots, it is covering a distance of 10 nautical miles per hour. VTS operators must be familiar with knots to communicate vessel speeds effectively.
Low Pressure System #
Low Pressure System
A low #
pressure system is a weather system characterized by lower atmospheric pressure relative to its surroundings. Low-pressure systems are often associated with cloudy skies, precipitation, and windy conditions. They can lead to the formation of storms, such as hurricanes and cyclones, making them significant factors in weather forecasting and meteorology.
Marine Forecast #
Marine Forecast
A marine forecast is a specialized weather forecast tailored to maritime activit… #
It provides information on wind speeds, wave heights, visibility, and other conditions relevant to the safety of vessels at sea. VTS operators rely on marine forecasts to make informed decisions about vessel traffic management and safety.
Nor'easter #
Nor'easter
A nor'easter is a type of extratropical cyclone that typically affects the East… #
Nor'easters are known for bringing strong winds, heavy precipitation, and coastal flooding to the region. VTS operators along the East Coast must closely monitor nor'easters to ensure the safety of vessels navigating in affected areas.
Oceanography #
Oceanography
Oceanography is the scientific study of the world's oceans, including their phys… #
It plays a crucial role in understanding marine ecosystems, climate patterns, and the impact of human activities on ocean health. VTS operators must have a basic understanding of oceanography to effectively manage vessel traffic in coastal waters.
Pressure Gradient #
Pressure Gradient
A pressure gradient is the rate at which atmospheric pressure changes over a giv… #
It is responsible for driving winds from high-pressure areas to low-pressure areas, resulting in air movement and weather patterns. VTS operators use pressure gradients to assess wind speeds, predict storm systems, and make decisions about vessel routing and safety.
QuikSCAT #
QuikSCAT
QuikSCAT is a satellite #
based instrument developed by NASA to measure ocean surface wind speed and direction. It uses microwave radar technology to collect data on wind patterns over the world's oceans, providing valuable information for weather forecasting, climate research, and marine operations. VTS operators may use QuikSCAT data to monitor wind conditions in their designated areas.
Radar #
Radar
Radar is a technology that uses radio waves to detect objects and measure their… #
It is commonly used in meteorology to track weather systems, such as storms, precipitation, and wind patterns. VTS operators rely on radar systems to monitor vessel traffic, detect potential hazards, and ensure the safety of ships in their jurisdiction.
Storm Surge #
Storm Surge
A storm surge is an abnormal rise in sea level caused by strong winds and low at… #
Storm surges can inundate coastal areas, causing flooding, erosion, and property damage. VTS operators must be prepared to respond to storm surges by implementing safety measures and coordinating vessel traffic accordingly.
Thermocline #
Thermocline
A thermocline is a distinct layer in the ocean where temperature changes rapidly… #
It separates warmer surface waters from colder, denser waters below, creating a barrier to vertical mixing. Thermoclines play a critical role in ocean circulation, marine life distribution, and climate patterns. VTS operators should be aware of thermocline effects on vessel operations and safety.
Upwelling #
Upwelling
Upwelling is the process by which cold, nutrient #
rich water rises from the deep ocean to the surface, replacing warmer surface waters. It occurs along coastlines and in open ocean regions, fueling productivity in marine ecosystems. Upwelling zones are often characterized by strong winds and upwelling currents, which can impact vessel navigation and fishing activities. VTS operators should monitor upwelling areas for potential safety hazards.
Vessel Traffic Services (VTS) #
Vessel Traffic Services (VTS)
Vessel Traffic Services (VTS) are maritime traffic management systems designed t… #
VTS operators monitor vessel movements, provide navigational advice, and coordinate traffic flow to prevent collisions and protect the marine environment. VTS play a crucial role in ensuring safe and secure maritime operations worldwide.
Weather Buoy #
Weather Buoy
A weather buoy is a floating platform equipped with sensors to measure atmospher… #
Weather buoys provide real-time data on weather conditions at sea, helping meteorologists, oceanographers, and VTS operators make accurate forecasts and monitor maritime activities. VTS operators may use weather buoy data to assess sea conditions and issue safety warnings to vessels in their jurisdiction.
X #
Band Radar
X-band radar is a type of radar system that operates in the microwave frequency… #
It is commonly used in maritime applications, such as ship navigation, weather monitoring, and search and rescue operations. X-band radar provides high-resolution images of nearby objects, making it valuable for VTS operators in detecting vessels, obstacles, and weather systems in their designated areas.
Yacht #
Yacht
A yacht is a recreational vessel used for cruising, racing, or leisure activitie… #
Yachts come in various sizes and designs, from small sailing boats to large luxury motor yachts. VTS operators must be aware of yachts in their jurisdiction and provide assistance, guidance, and safety information to ensure their smooth navigation and compliance with maritime regulations.
Zone Time #
Zone Time
Zone time, also known as local time, refers to the standard time of a specific g… #
Zone time is used for coordinating activities, such as vessel schedules, weather forecasts, and navigation plans. VTS operators must be familiar with zone time differences to communicate effectively with vessels from different time zones.