Reading wind barbs is simple and complicated at the same time, much like the multiplication table. Simple —because they are essentially simple signs that are formed by a single formula. Difficult — because you have to learn it, which takes some time. So here it is: The data shows average pollution levels for regions of the country. This means that there may be areas in the region with higher or lower levels of pollution than the average. This value represents the highest wind speed that you should encounter at that point in time, as the winds peak, and then lull again. The speed represents the average wind speed expected at that point in time, i.e. the mean wind speed you may encounter (in reality the wind will strengthen and lull constantly above and below this value). It is interesting that in the Ancient Greece, the cardinal directions were also identified by the different winds. They were Boreas from the north, Notos from the south, Eurus from the east, and Zephyrus from the west. They are also known as the " Classical compass winds". Therefore, the concept of wind direction is very closely related to the concept of wind rose.

These are the forecasted maximum (highest) temperature for the day and the forecasted minimum (lowest) temperature at night. Day is from 9am to 9pm and night is from 9pm to 9am.

It’s all change at a weather front

Radar maps show rain and snow detected in real-time. Data is provided by RainViewer. Coverage is limited and may show glitches/anomalies. The pollen symbol shows the level of pollen in the air. We measure pollen levels across the country and work with other organisations, (like the National Pollen and Aerobiological Unit) to create a five day forecast. In this short tutorial, we'll tell about the top five ways from simple to more complex: 1. Wind arrows If the wind is the movement of air, this movement always has some direction. The question is: where exactly the air is moving in man-made coordinate systems. Modern instruments used to measure wind speed and direction are called anemoscopes, anemometers and wind vanes. These types of instruments are used by the wind energy industry, both for wind resource assessment and turbine control.

The number in the coloured bars represents the air temperature at that time in the units selected in Settings (Celsius or Fahrenheit). Feels like Atmospheric pressure doesn’t only change with height, it also varies across the surface of the Earth.Wind barbs are symbols for indicating wind speed and wind direction on weather maps. In this article, you'll learn more about what it is, how to read wind barbs, and where to get a wind forecast with such a symbols. What are the wind barbs? Sometimes the red or blue line of a front will be broken by crosses. This indicates that the front is weakening and the difference in the warmth or dryness of the air is becoming less marked. Occluded fronts For example, an arrow pointing upwards indicates a wind blowing from the south to the north, along with the letter S to indicate that it is a southerly wind. Because wind is an element that varies rapidly over very short periods of time it is sampled at high frequency ( e v e r y 0.25 sec) to capture the intensity of gusts, or short-lived peaks in speed, which inflict greatest damage in storms. The gust speed and direction are defined by the maximum three second average wind speed occurring in any period.

Cold fronts tend to move faster than warm fronts and over time they can catch up with each other and create an 'occluded' front. This is shown as a purple line with a purple semi-circle and triangle next to each other. The air trapped between a warm and cold front is called a 'warm sector' and we often see low cloud and patchy light rain associated with this type of air. Troughs At the same time this wind speed and direction map in Windy.app can show you also wind gusts, and much more. Read the complete guide to the Wind map in Windy.app. 4. Wind barbs In the Windy.app wind barbs are located in the nodes of the weather model grid — points on the map where the weather is predicted. This excludes interpolation (forecast errors) — the forecast is as accurate as possible. In this implementation, it is a unique feature of the Windy.app you will not find in other weather mobile applications.The wind barbs source is one of the 10 weather models used in the app. It's updated every three hours. Where to get wind barbs? At intervals of no longer than five years, anemometers are calibrated in a wind tunnel to identify any departures in the relationship between spindle rotation and wind speed specified by the manufacturer. Calibration corrections are applied to the measured wind speed.As seen here, some surface weather maps include groupings of numbers and symbols known as weather station plots. Station plots describe the weather at a station location. They include reports of a variety of weather data at that location: HD satellite images are updated twice a day from NASA polar-orbiting satellites Aqua and Terra, using services from GIBS, part of EOSDIS. Wind speed normally increases with height above the earth's surface and is much affected by such factors as the roughness of the ground and the presence of buildings, trees and other obstacles in the vicinity.

The directions are further divided into four more: northeast (NE), southeast (SE), southwest (SW), and northwest (NW). So we have now 8 main directions. Wind speed is normally measured by a cup anemometer consisting of three or four cups, conical or hemispherical in shape, mounted symmetrically about a vertical spindle. The wind blowing into the cups causes the spindle to rotate. In standard instruments the design of the cups is such that the rate of rotation is proportional to the speed of the wind to a sufficiently close approximation.

The benefits of a high pressure situation

A stationary or slow-moving boundary between two air masses. Cloud and precipitation are usually associated. A slow-moving trough, which is often parallel to the isobars and tends to be persistent over many hours. They are quite common in cold northerly outbreaks down the Irish Sea, affecting west Wales, Devon and Cornwall in particular, but can be found in other areas also. This convergence line can give hours of persistent precipitation over very localised areas, whilst a few miles down the road it is relatively dry, leading to some heavy snowfall/rainfall. In summer the convergence lines are not as easy to forecast, but then can still occur due to sea-breeze convergence, and are over the land, whilst in winter they are over the sea. Another word that says the same thing is "compass," a device for determining cardinal directions you know probably from your Scout days. Yes, reading barbs is a bit more difficult than arrows, so learn more about how to read wind barbs.