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Fair Isle Weather - November 1998
Slightly cooler (-0.4°C) than average, wetter (124.1%), but with hours of sunshine (148.0%) well above normal. Shetland as a whole was also sunny. Lerwick, with 57.7 hours (186.1%) sunshine during the month, recorded its sunniest November on record. Like Fair Isle, rainfall was also above average (112.1%) but, unlike here, at Lerwick the monthly mean temperature was slightly above average (+0.3° Celsius). With pressure low over the North Sea and fresh N to NEly winds across Scotland, the month began cold with mean daily temperatures some 3° Celsius below normal. During the first few days further lows, tracking east across the south of the British Isles, maintained the cold N to NEly airflow. Early on the 5th, as winds eased, temperatures fell quickly to the months lowest of 0.6° Celsius in the air and 1.3° Celsius on the grass. Later in the day a low then ran east across Northern Scotland followed, early on the 6th, by a weak ridge of high pressure. A small low, moving quickly north-east, brought a very wet end to the day with 21.6 mm measured by 09 hours the following morning. By the 7th a deepening Atlantic low the remnants of ex-hurricane Mitch was tracking north-east towards the British Isles. It then turned northwards, moving to a position off Western Scotland on the 8th, with heavy rain and SEly winds increasing gale to severe gale force across Shetland. Winds then veered SWly and eased temporarily early on the 9th, allowing the temperature to rise to the months maximum of 11.0° Celsius. Winds soon increased, reaching storm force over exposed parts of Shetland and gusting to 66 kt on Fair Isle, as the depression continued north past Shetland and on across the Faeroes. The 10th was a blustery day with strong to gale force SW to Wly winds across the North. High pressure, building to the south of the UK, developed a ridge northwards on the 11th. This moved quickly east as the next Atlantic low headed quickly north-east across Scotland. The 13th and 14th saw a complex area of low pressure across the UK but, as this moved away across the North Sea, Nly winds brought a spell of cold showery weather for the next few days. High pressure then developed south across Iceland towards Scotland, with winds gradually falling light across the area for the next few days. As high pressure drifted away towards Norway on the 19th, Atlantic weather systems with strengthening SEly winds edged towards Scotland. High pressure hanging on over Scandinavia delayed eastwards progress of the fronts until a deepening Atlantic low, moving north towards Iceland, finally drove the fronts east across Shetland on the 20th. For the next few days Atlantic lows, tracking north-east between Scotland and Iceland, maintained the mild SWly winds as a series of fronts pushed east across Shetland. On the 26th a small low, slipping south-east across Scotland, was followed by a narrowing ridge of high pressure. NWly winds soon backed SWly again later on the 27th as the next deep low moved north towards Iceland, bringing a mild end to the month with rain and strong SWly winds.
Weather Diary - November 1998
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