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Storm Angus

The first named winter storm came with strong warnings, of high winds and heavy rain overnight on Saturday into Sunday. Although it was breezy we did not see particularly high winds here, but the system was notable for its very low pressure (a new record for this location) and for a great deal of rain (a new record for 24 hour rain in this location).

The wind peaked around 2am Sunday morning with gusts of 34.8 knots and an average of 13 knots (which is Beaufort force 4 or a “moderate breeze”: enough to lift small pieces of paper or leaves)

wind speed graph


[su_spacer]There was a clear change in wind direction, from SE to W and then SW just a little after the strongest winds, as the depression moved through. The wind fell briefly to calm as this happened. This, with the pressure trace, suggests that the centre of the depression passed straight over us.

change in wind direction[su_spacer]The major feature of this system was rain. We had 43.8mm in the day (9am – 9am) which is 1.73 inches and a new record for this weather station. The peak rain rate was only 21mm/hr with just over 8mm in the heaviest hour. We had heavy, rather than torrential, rain for many hours, as the graph shows.

rainfall graph


[su_spacer]There was a new record low pressure here of 969.62hPa — 28.63 in — and a sharp fall and then rise in pressure as the deep depression passed through quickly.

Pressure graph


[su_spacer]The system was a classic “bomb” depression. It formed and deepened quickly, then passed quickly along the English Channel and across the SE of England. This was driven by an active jet stream. Such systems are fairly common at this time of year.