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London / Heathrow Airport United Kingdom Weather Forecast

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London / Heathrow Airport, United Kingdom  Lat: 51.48N, Lon: 0.45W
ICAO Used: EGLL
Current Conditions
Updated: 420 AM FRI MAR 29 2024
Sun & Moon Information
Light Rain
Light Rain
Temp: 8°C
Humidity: 87%
Wind Speed: S 13 MPH
Barometer: 0984 mb
Dewpoint: 6°C
Heat Index: 8°C
Wind Chill: 5°C
Civil Twilight: 5:08 AM GMT+0 Moon Phase:
Waning Gibbous Moon
Sunrise: 5:42 AM GMT+0
Sunset: 6:29 PM GMT+0
Civil Twilight: 7:03 PM GMT+0
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Weather forecasting is the application of science and technology to predict the conditions of the atmosphere for a given location and time. People have attempted to predict the weather informally for millennia and formally since the 19th century. Weather forecasts are made by collecting quantitative data about the current state of the atmosphere at a given place and using meteorology to project how the atmosphere will change.

Once calculated by hand based mainly upon changes in barometric pressure, current weather conditions, and sky condition or cloud cover, weather forecasting now relies on computer-based models that take many atmospheric factors into account. Human input is still required to pick the best possible forecast model to base the forecast upon, which involves pattern recognition skills, teleconnections, knowledge of model performance, and knowledge of model biases. The inaccuracy of forecasting is due to the chaotic nature of the atmosphere, the massive computational power required to solve the equations that describe the atmosphere, the error involved in measuring the initial conditions, and an incomplete understanding of atmospheric processes. Hence, forecasts become less accurate as the difference between current time and the time for which the forecast is being made (the range of the forecast) increases. The use of ensembles and model consensus help narrow the error and pick the most likely outcome.

There are a variety of end uses to weather forecasts. Weather warnings are important forecasts because they are used to protect life and property. Forecasts based on temperature and precipitation are important to agriculture, and therefore to traders within commodity markets. Temperature forecasts are used by utility companies to estimate demand over coming days. On an everyday basis, people use weather forecasts to determine what to wear on a given day. Since outdoor activities are severely curtailed by heavy rain, snow and wind chill, forecasts can be used to plan activities around these events, and to plan ahead and survive them. In 2009, the US spent $5.1 billion on weather forecasting

US Forecasts are Public Domain and derived from the
National Weather Service and the National Oceanic Atmospheric Administration (NOAA)
Canadian forecasts are obtained from and are copyright of Environment Canada.