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September 2007 - Wales

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Review of Wales' weather in September 2007.

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Summary

Frequently fine and dry during the first half of the month. More unsettled later, with rain at times and turning colder, with temperatures below average on some days.



Diary of Highlights

1st to 3rd
A weak front moved over the country on the 1st in the westerly flow. Light rain affected western Wales, followed by drier conditions. Another front followed south late in the day on the 2nd and the wind turned into the north-northwest on the 3rd.

4th to 9th
High pressure centred west of Biscay and drifted towards Ireland bringing fine and settled conditions. After a chilly start on some mornings temperatures climbed into the low to mid 20's Celsius inland.

10th to 13th
A cold front moved south on the 10th, bringing rain to most parts. Thereafter, pressure built across the principality and the fine and locally warm weather resumed, although with a minimum of just 2.6 °C at Sennybridge (Powys) on the morning of the 11th.

14th to 18th
A band of rain spread southeast on the 14th followed by drier conditions on the 15th. Then low pressure, moved northeast near Scotland and pushed a cold front southeastwards later on the 16th and early 17th, bringing some heavy rain as it passed. The fine weather returned on the 18th.

19th to 24th
The wind was predominantly south-westerly during this period and various frontal systems crossed the area bringing rain at times. A particularly vigorous cold front brought some strong gusts on the 24th in the convective rain near its leading edge.

25th to 30th
The wind turned north-westerly on the 25th and pressure built over northern and western parts of the UK. A cold north to northeasterly airstream developed for a time and maximum temperatures were well below average, typically just 12 to 15 °C on the 26th. Rain spread southwest mainly across south Wales on the 28th, but the month ended on a drier note and with lighter winds.

Statistical details
Wales Mean Temperature Series (series began in 1914). The provisional mean value for the month is 13.0 °C 0.6°C to the 1961-1990 average.
Wales Rainfall Series (series began in 1914). The provisional total for the month is 95.4 mm 78% of the 1961-1990 average.
Wales Sunshine Series (series began in 1929). The provisional total for the month is 133.3 hours 107% of the 1961-1990 average.






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