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Apr 28, 2019 · When does the Met Office issue them? Most yellow warnings are issued when weather is expected to cause low level disruption of services such as trains and roads. Some people will be "directly ...
The Quasi-Biennial Oscillation is a regular variation of the winds that blow high above the equator. Strong winds in the stratosphere travel in a belt around the planet, and every 14 months or so, these winds completely change direction. This means a full cycle takes roughly 28 months, making it the most regular slow variation in the atmosphere ...
17 hours ago · Our weather symbols tell you the weather conditions for any given hour in the day or night. This means that the symbol for 9am shows you what you will see from 9am to 10am. Chance of precipitation represents how likely it is that rain (or other types of precipitation, such as sleet, snow, hail or drizzle) will fall from the sky at a certain time.
a collection of instruments which measure surface weather conditions at a specific location. Instruments can include, amongst others, thermometers, anemometers, rain gauges, and radiometers. Automatic Weather Stations monitor and record observations automatically, whereas manual weather stations rely on meteorologists.
A warm front is symbolised on a weather map as a line with semicircles. The semicircles can be thought of as half suns. Warm fronts are often coloured red. The presence of a warm front means that warm air is advancing and rising over cold air. This is because warm air is 'lighter,' or less dense than cold air.
Instead we now use digital thermometers or alcohol thermometers. To measure the temperature accurately we keep our thermometer a Stevenson screens. This is a white box with slats in it to allow air to flow through the box. Stevenson screens face north, which combined with their colour and slats, give us the best measure of the current ...
the elevation angle (height) of the sun in the sky. the amount of cloud, dust and pollution in the atmosphere. the amount of ozone gas in the stratosphere. The presence of ozone in the stratosphere is important because it absorbs much of the UV radiation before it reaches ground level. Our UV model currently accounts for sun angle and forecast ...
