Development of surface LOW threatens heavy rain overnight in SE

September 13, 2013 — Leave a comment

Chart on left shows rain forecast for tonight (Fri-Sat).  Chart on right shows some interesting synoptic situation in Atlantic early next week.

Reigate and SE could see some heavy and even torrential rain from late afternoon / evening today and overnight clearing Saturday am. Totals could exceed 30mm in places, but more widely totals between 10-20mm. This LOW is moving from SW in the Channel and proceeding overhead across the SE with a complex of associated fronts. This system heralds the mother of all LOWS which is moving in on Sunday… sweeping an unusually cold Arctic blast across the whole country by early next week. Autumn is here and the Atlantic shows signs of greater activity with a more active jetstream and the appearance of the first ex-hurricane / extra-tropical storm Humberto on the Atlantic Charts next week too.  Humberto is delivering Tropical air to the Pole, while our cold Arctic blast does the opposite.

The big news this weekend is the start of the temperature drop-off which looks to last most of next week.  Saturday will start this process off as cooler air is set to sweep down across the country, mainly from Sunday onwards.  Tmax might reach 12c but in the wind it’ll feel 10c or so and with rain as well it’ll all look thoroughly Autumnal!  Later next week there are signs of high pressure building back in with better weather and a recovery of temps, but let’s wait and see on that one!

850hPa drop this weekend

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