Dry December thus far

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Dry December thus far

Postby Len Wood » 2014 Dec 22, 17:02

My total for December to the 22nd is only 36.4 mm.
It has still been damp though with only 6 dry 24 hr periods in 22.
Daily rain amounts have just been small in this predominantly mild Tropical Maritime air.

At the moment it is the driest December since 1975 which occurred during the famous 1975-76 drought.

However, there are still 9 days to go and the forecast charts indicate something a little more lively in the next few days.
Len

Wembury, SW Devon coast
N50.33 W4.13
Altitude 83 m asl
Len Wood
 
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Location: Wembury, coastal SW Devon, 83 m asl

Re: Dry December thus far

Postby Nick Gardner » 2014 Dec 22, 19:45

No rain since the 19th when all of 1.1 mm fell and the total to date (22nd) stands at 29.8 mm.

There have been 13 rainless days this month.

It seems that Tropical Maritime air rarely produces any precipitation here but even so, I am surprised by how everything has dried-out over the last few days.

I don't know whether it is because the air has passed over high ground to my west (Dartmoor) but today and yesterday have been bright with occasional spells of sunshine. This has made it feel more like spring than late-December.

A lovely maximum of 13.1°C this afternoon after an overnight low of 11.7°C.

December 2014 (1st - 22nd)
Mean minimum = 3.9°C
Mean maximum = 10.4°C
Mean = 7.2°C
Sunshine = 63 hours.
Near Newton Poppleford, Sidmouth - Devon
50:41N 3:17 W; 20 metres AMSL; Station Grade B-BAAA37
http://www.ottervalley.co.uk
Nick Gardner
 
Posts: 429
Joined: 2012 Jan 27, 17:25
Location: Rural riverside valley location near the village of Newton Poppleford and 2 km from the sea.

Re: Dry December thus far

Postby greg_gruner » 2014 Dec 23, 14:43

Also quite dry so far in Farnborough with 21.5mm here. My rain gauge does under-read a bit due to the proximity of the house one side and trees the other, but even Reading University has only had 29mm.
Av max temp = 9.3C
Av min temp = 2.7C
Mean temp = 6.0C (+1.2 on estimated LTA).

Very different to last December, when I recorded 68.5mm and most places round here had considerably more.
It seems that the jet stream is much further north this December, and also more aligned east-west. Prevailing winds have been westerly, rather than the SW or even SSW of last December.
It looks like the big storm forecast for Saturday is just a one-off and will be followed by high pressure for the remainder of the month.
Greg Gruner
Farnborough, Hampshire
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Re: Dry December thus far

Postby Nick Gardner » 2014 Dec 23, 19:57

Still dry here since the 19th but inland and after a bit of sunshine today to warm things up a little there were a few beefy showers around. Driving between Honiton and the Blackdown Hill there were a couple of quite sharp downpours this afternoon.

Instead of the usual stratus type cloud associated with this current Tropical Maritime air, the cloud type was mainly cumulus today. Rather unusual given the air type and time of year signifying some instability up there?

23rd
Minimum = 11.0°C
Maximum = 13.8°C
Sunshine = 1.4 hours.
Near Newton Poppleford, Sidmouth - Devon
50:41N 3:17 W; 20 metres AMSL; Station Grade B-BAAA37
http://www.ottervalley.co.uk
Nick Gardner
 
Posts: 429
Joined: 2012 Jan 27, 17:25
Location: Rural riverside valley location near the village of Newton Poppleford and 2 km from the sea.

Re: Dry December thus far

Postby Richard Hunt » 2014 Dec 23, 21:46

Monthly Total: 19·0mm

24hr Maximum: 6·6mm -- Day 17

Rain Rate Maximum: 7.2 mm/hr -- Day 02

Rain Days >0.2mm: 11

Wet Days >1.0mm: 3

Manual 4" Rain gauge


MEAN MIN: 3·9°C

MEAN MAX: 8·4°C

MEAN: 6·1°C

(Anomaly +1·7°C)
COL Station: 25020.

Watson W-8681 AWS. Standard Stevenson Screen. Maximum and Minimum screen thermometers. Grass minimum thermometer.
5" Copper standard rain gauge. Roof mounted annemometer.
Richard Hunt
 
Posts: 374
Joined: 2012 Jan 27, 19:23
Location: Hornsea, East Yorkshire. 10m AMSL

Re: Dry December thus far

Postby Nick Gardner » 2014 Dec 27, 15:40

Yesterday's rainfall amounted to 6.8 mm bringing the monthly total to 36.5 mm.

Given the dry forecast, this is likely to end up the actual total for December.

My driest December since before 2005 was the very cold December of 2010 with a monthly total of 31.6 mm.

The driest spell I've ever recorded in December was in 2008 when no rainfall was recorded between the 14th and the 31st giving a total of 18 consecutively dry days. It has been very different this December where rainfall has been light and relatively evenly spread through most of the month.

Monthly mean temperature at 7.3°C. I'll expect that to drop somewhat over the next few days.
Near Newton Poppleford, Sidmouth - Devon
50:41N 3:17 W; 20 metres AMSL; Station Grade B-BAAA37
http://www.ottervalley.co.uk
Nick Gardner
 
Posts: 429
Joined: 2012 Jan 27, 17:25
Location: Rural riverside valley location near the village of Newton Poppleford and 2 km from the sea.


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