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About This Station
The station is powered by a Davis Vantage Pro Plus weather station. The data is collected every 2.5 to 50 seconds and most of the pages are updated every 5 minutes. Some of the current data is updated every 4 seconds. This website and most of its data is collected and displayed using Weather Display Software but Ambient's Virtual Weather Station software is also used extensively. The station comprises of an anemometer, rain gauge and a thermo-hydro sensor situated in optimal positions for high accuracy. It also has a Solar Radiation, Ultra Violet and Sunshine hours sensors. In addition to the Davis standard tipping bucket rain gauge with a 0.25mm resolution, a high resolution infra red optical measuring rain gauge capable of 0.01 mm resolution is also used for more precise rainfall recording.
The Sunshine Sensor functions by comparing sunlight to shadow. When the ratio exceeds a pre-determined threshold the sun is deemed to be shining and the counters will count up one every 36 seconds (0.01 hour). The sunshine sensor, obtained from Instromet, is connected to a data-logger and data is recorded and stored using Met4Net software.
The web image, from a web camera pointing north, is updated every minute. The image is processed using ImageSalsa software.
About Harrow
Harrow is the second principal town in the London Borough of Harrow, North West London. It is a suburb situated 12.2 miles (16.4 km) west northwest of Charing Cross, the centre of London. It is one of ten major metropolitan centres identified in the London Plan. Harrow is widely known for Harrow School, attended by seven Prime Ministers including Winston Churchill and Indian Prime Minister Jawaharlal Nehru. W S Gilbert of Gilbert and Sullivan used to live in Old Redding in a big old house now the Grim's Dyke Hotel.In the past, land that now comprises the Borough of Harrow was a collection of villages surrounded by farmed and open land. The area prospered as London grew, and as transport links improved with the Metropolitan Railway, housing filled much of the space between the villages, with some land reserved for parks. Villages like Harrow-on-the-Hill, Pinner, Hooking Green, Wealdstone, Hatch End, Stanmore, Wealdstone and Headstone now make up the borough of Harrow.
Bentley Priory
The original priory, on a site nearby the current house, housed a cell of Augustine Friars and was believed to have been founded about 1170 by Ranulf de Glanville, a lawyer. Another priory, built in the 13th century in honour of St Mary Magdalene was given by the Archbishop of Canterbury to the Prior of St Gregory. Its religious days ended in 1546 and it was eventually sold to James Duberley, an army contractor, in 1766. He is thought to have pulled down the priory and built the existing, more imposing house higher up the hill about 1775. Over a number of years the house was extended and refurbished and the existing clock tower was added at a later date. It was a family home until 1882 when it was converted into a hotel, then a girls school until 1924 when it was bought by the Air Ministry in 1926. It was from here that Air Marshall Lord Dowding controlled RAF operations during the Battle of Britain in 1940.
Headstone Manor
Headstone Manor and adjacent barn dates from the 14th century. The moated manor house was built as a home for the Archbishops of Canterbury and is an architecturally rare building which has recently been restored. Original moated buildings are exceedingly rare. The land on which Headstone Manor stands is recorded to have belonged to Wulfred, Archbishop of Canterbury, in 825AD. The construction of Headstone Manor began in c.1310, as revealed by the tree-ring dating of the building’s oldest timbers. John Stratford, Archbishop of Canterbury, purchased even more land around the site in 1344 and used the site as his main residence in Middlesex. Headstone Manor remained in the ownership of the Archbishops of Canterbury until 1546, when it was surrendered to Henry VIII. Soon after, Henry VIII sold it to one of his court favourites, and it remained in private ownership for almost four centuries.
About This Website
Home pageThe home page is currently automatically "refreshed" every 5 minutes. This is to update the current web camera image although the data is also refreshed by this means. The weather data values, and only the changed values, are normally updated every 4 seconds.
Charts/Graphs
All of the new graphs/charts on this website have been generated using
JPGraph v2.3. The "24 Hour" charts are updated every
4 minutes. If, when you request the "24 hour" charts, the chart stored on the server is more
than 4 minutes old, a fresh chart is generated. The "7 Day" and "31 Day" charts are generated once per day, on the first browser request of the day. Once the
chart has been generated all subsequent browser requests are sent the cached image files.
This is because the data is updated just after midnight and it does not change during the day. Other charts, e.g. annual charts are updated manually.
Weather forecast
A weather forecast has been recently added. The forecast is generated by WXSIM using local data and data downloaded from the Internet.
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