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 December 2013 
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 Post subject: December 2013
PostPosted: Wed Jan 01, 2014 12:33 pm 
Professor
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Joined: Mon Nov 02, 2009 8:52 pm
Posts: 7695
Location: Brampton
Altitude: 117m
Weather Station: Davis VP2
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Brampton

Headline - no air frost, first time on record - also record low pressure recorded on the 23rd only to be beaten on the 26th

Mean Max 8.9 (+2.6)
Mean Min 3.9 (+3.0)
Mean 6.4 (+2.7)
Highest Max 11.9c 13th
Lowest Max 5.4c 22nd
Lowest Min 0.1c 6th ( AWS reported +0.4c same night)
Highest Min 9.1c 9th
Grass Min -3.7c 6th

Air Frost - nil
Grass Frost 17
Conc Min - 11

Rainfall Total 143.1mm (154%)
Wettest Day 21.9mm 23rd

Sunshine 21.2hrs (71%)
Sunniest 2.5hrs
Days no sun - 14

Wind - Max Gust 64mph 27th
Mean Wind 11.7mph

Pressure Mean at 0900hrs - 1005mb
High - 1034
Low - 957 ( record )

Days with snow at 0900hrs - nil
Days with snow falling 2
Days with hail- 5
Days with Gale - 2

No Fog or Thunder

This month has been the mildest December on record with temperatures way above normal. Mean temp +2.7c higher than would be expected. Complete absence of an air frost for the first time on record. Rainfall was 154% but just missed out on being the wettest December by a few mm. A record low pressure on the 23rd was beaten a few days later on the 26th with 957.94mb at 0701hrs 27th December .

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Paul C
Brampton. 117m ASL.
http://www.bramptonweather.co.uk
Imagehttps://twitter.com/#!/pacrabtree


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 Post subject: Re: December 2013
PostPosted: Wed Jan 01, 2014 2:31 pm 
Chief Area Forecaster
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Joined: Mon Nov 02, 2009 9:25 pm
Posts: 5498
Location: Drumburgh
Altitude: 7m
Weather Station: Davis VP2
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Mildest since 1988 based on Carlisle 14MU figures.
Fewest AF's on record.

M.MAX: 9.8c (+3.3)
M.MIN: 3.4c (+2.9)
MEAN: 6.6c (+3.1)

H.MAX: 13.7c 13th
L.MAX: 6.2c 22nd
L.MIN: -0.6c 6th
H.MIN: 11.1c 13th

G.MIN: -6.1c 26th

Rainfall

TOTAL 135.9mm 153%

Most: 29.3mm 21st (highest daily on record)

0.2 26 +8
1.0 19 +6
5.0 8 +1
10.0 5 +2

AF 4
GF 22
Hail 6

Sleet/Snow 2
Thunder 1

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Drumburgh 7m AMSL (Solway Estuary)
http://www.coggabata.co.uk/weather.html


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 Post subject: Re: December 2013
PostPosted: Wed Jan 01, 2014 5:44 pm 
Senior Climatologist

Joined: Mon Jan 04, 2010 4:18 pm
Posts: 880
Location: Scotby
Altitude: 31
Weather Station: Davis VV
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Mild, stormy and wet sums up December 2013. The average maximum temperature of 9.5C was milder than November and very nearly the same as December 1988, which is the mildest in my records. There were no air frosts at all in Scotby during December, for the first time since my records started in 1986. The coldest night was the 6th when it almost fell to freezing with 0.7C. The highest daytime temperature was 12.8C on the 13th and 15 days during December had highs over 10C.

The total rainfall for December was 148.6mm, which is over 50% more than average and my second wettest December after 1999. The first half of the month was relatively dry but then unsettled and stormy weather dominated the second half of the month. There was much rain and very strong winds created by exceptionally low pressure systems crossing Britain. I recorded the lowest pressure and strongest gust of wind in my records. We were fortunate in Scotby to avoid the worst effects of the storms which caused havoc elsewhere.

Anne


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 Post subject: Re: December 2013
PostPosted: Thu Jan 02, 2014 12:28 am 
Weather Nut
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Joined: Sat Apr 02, 2011 10:22 pm
Posts: 1967
Location: Isel valley, Northern Lakes
Altitude: 140m
Weather Station: Manual
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sickener

Mean Max 8.8c

Mean Min 4.3c

Mean 6.5c

High Max 12.8c (12th)

Low Min 0.4c (5th, 6th)

Rainfall 187.9mm

Wettest day 26.1mm (30th)

Air Frost 0!!

Snow falling 1

Snow lying 0

Sleet 3

Thunder 2


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 Post subject: Re: December 2013
PostPosted: Thu Jan 02, 2014 8:54 pm 
Chief Area Forecaster
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Joined: Sat Nov 14, 2009 10:57 am
Posts: 3195
Location: Seaton
Altitude: 40
Weather Station: Davis VP2
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Mean max 9.7 +2.5
Mean min 5.9 +3.7
Mean 7.8 +3.1

Max 12.7 12th
Min 2.3 5th
Low max 6.9 26th, 28th
High min 9.4 12th
Rain 155.2 137%


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 Post subject: Re: December 2013
PostPosted: Sat Jan 04, 2014 11:25 pm 
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Joined: Mon Nov 02, 2009 10:23 pm
Posts: 1900
Location: Maulds Meaburn, Cumbria
Altitude: 183
Weather Station: Davis VPro2
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From MM

Monthly Summary - December 2013

December presented an amiable face for the first few days, thereafter it revealed itself to be volatile, moody and tempestuous or if you prefer, wet, windy, mild and at times quite stormy.

The month apart from a notable storm on the 5th was fairly quiet upto the 12th, but thereafter an abrupt change as a succession of deep and vigorous depressions arrived of the Atlantic. These depressions rose due to steep temperature contrasts over America and under the influence of a very active Jet Stream literally raced across the Atlantic. Subsequently daily rainfall totals were high with 3 days recording in excess of 1 inch of rain and 7 days recording wind gusts of over 50 Mph.

Consequently with the succession of depressions mean SLP was some -5.1 Mb below average, but in such conditions frost is never an issue and indeed the month was notably mild.

Overall a mean minimum of 3.16°c and a mean maximum of 8.33°c saw the temperature some 2.3°c above the 1981-2010 average, making it the warmest December since 1988.

Rainfall locally was double the December average and the wettest since 2006. At Newton Rigg (199.4 mm - EA gauge) in a series back to 1914, December as been wetter on just 3 occasions (3 years of missing data.) and this is the 17th wettest of any month in that time. The 270.7 mm of rain here at Maulds Meaburn making it the second wettest of any month in my 7 years of records.

Figures from the Enviroment Agency’s rainfall sites were, (figure in brackets being the monthly average for 1961-90): Kirkby Thore 147.6 mm (71.7 mm) , Brothers Water 599.2 mm (304 mm), Nunwick Hall 160.6 mm (78.3 mm) and 671.4 mm/26.4 inch at Seathwaite Farm (Borrowdale - 339 mm).

‘Data kindly provided by the Hydrometry and Telemetry team of the Enviroment Agency (Penrith)’.



1st - 3rd With high pressure (HP) dominant over the UK but drawing up mild and moist air from the Atlantic, the month started quietly with the month's coldest temperature of (only) -1.5°c. However, it was somewhat overcast and this would be a theme that would return come the 6th.



4th - 5th After rain overnight into the 4th the day became bright with some spells of sun, but that was only ahead of stormy conditions on the 5th. Low pressure north of Scotland pushed a cold front south and as that plunged south it squeezed up against the HP sat south west of the UK and the winds intensified. Gusts over 60 mph were common through the morning, peaking at 65 Mph, then the highest of 2013.

Fortunately rainfall was insignificant and the winds eased back in the afternoon, but with the odd wintry shower.



6th - 12th And now it became unseasonably mild as the HP to our south west migrated slowly over France and then Europe and which gave a feed of brisk and mild south westerly winds. A warm front that pushed over the UK later on the 6th introduced the milder air to the UK and day-time temperatures were frequently in excess of 10°c.

Especially notable was an overnight 'low' temperature of 9.4°c on the 9th, something more akin to early summer! The period also saw little rain but the downside was the overcast conditions brought by the modification of the sub tropical air due to its long journey over the sea to our shores.



13th - 24th Whilst tending to remain mild it now became increasingly wet and stormy as a succession of vigorous Atlantic depressions rattled through in quick succession.

Once again the position of the Jet Stream came to the fore as it was responsible for the feed of those depressions. The 13th was the month's warmest day at 11.2°c but was also wet and then the intensity of the rainfall increased from now on to the month's end.

The 14th saw 28.4 mm and gusts to 54 Mph (Shap 44.4 mm) on the first depression to arrive in the period, followed by 16.8 mm 15th.

The pressure gradient slackened sufficiently overnight into the 17th to give a slight ground frost, -0.3°c and then a reasonable but cooler day. This was only ahead of the next depression 18th that gave 19.1 mm and winds to 56 Mph as the cold front moved through during the evening with the glass dropping to 978.5 Mb.

As that system cleared into the 19th it remained windy but became cooler behind and we saw a mix of wintry showers.

There was no let up as LP sat to the south of Iceland fed cold fronts over the UK during the afternoon and peaking in the evening of the 20th, depositing 42.0 mm (1.65 inch) and again with gusts over 50 Mph.

And this marked the first of four especially wet days with the 20th-23rd recording a total of 114.6 mm, that's an average of 1.13 inches of rain per day!

The 21st notched up 23.4 mm as that LP near Iceland still dominated and after a 'quiet day' 22nd with just 3.9 mm of rain with some wintry showers in a brisk westerly flow, there was still the month's wettest day to come.

Unlike the 21st and 22nd, the 23rd didn't quite get the 50 mph gusts of wind, but it did get 45.3 mm of rain and what is now the 7th wettest day recorded at this site. A rapidly deepening LP system was racing across the Atlantic and in which the pressure would drop by 42.4 Mb in 24 hours. Air pressure dropped to 937 Mb in South Uist, Hebrides (the lowest authenticated MSL pressure in the British Isles since 8 December 1886) and here at Maulds Meaburn to 960.6 Mb, the lowest locally since 10th March 2008.

The rain was incessant and falling onto already saturated ground caused some local flooding and there followed gusts to 56 mph in the early hours of the 24th with wintry showers later in the day.



25th - 26th At least Christmas itself was pleasant enough as we got to enjoy two reasonable days. The LP cleared away and the pressure gradient slackened and thus the winds eased back and we actually saw some sunny intervals over the two days. However, rain arrived late on Boxing day as a new LP system arrived and this was one quite brutal.



27th With a central pressure of 944 Mb, locally in the range 958-962 Mb, but significantly with a more southerly track than the storm of the 23rd, this storm saw some of the stronger winds affecting Cumbria.

The LP pushed frontal systems across the UK and the winds intensified during the late morning to gusts of 66 Mph on what became the windiest day yet recorded here. A mean wind speed for the entire day of 29.7 Mph is significant and at its peak the 10 minute average wind speed reached 41 mph (gale force).

Rainfall from this event totalled another 17 mm and yet more local flooding followed.



28th - 29th The pressure gradient again eased as the LP system of the 27th moved away and both days were quieter and clearer with some sunny spells. However, a new LP system arrived late evening of the 29th and which would give heavy rain (19.3 mm) overnight into the 30th.



30th - 31st With the LP arriving late on the 29th the month then finished wet and unsettled! The same LP sat in the north Atlantic and after the frontal system on the 30th which gave a poor day, the 31st remained wet but with a few brighter moments.



Rainfall totalled 270.7 mm for the month, with rain recorded on 24 days of which 22 were 'Wet days' (1.0mm +).

The Mean Temperature for the month was 5.74°c -- The Mean Max' was 8.33°c -- The Mean Min' 3.16°c.

We had 2 Air Frosts in the month (year 83) -- Grass frosts totalled 13 (year 136).

The 1 foot soil temp ranged from a low of 4.6°c on the 26-27th to a high of 7.4°c on the 16th -- with a monthly mean of 6.0°c

The 1 meter soil temp ranged from a low of 6.4°c on the 31st to a high of 8.0°c on the 1st and 5th -- with a monthly mean of 7.4°c

_________________
Darren Rogers - he who submits the most interesting posts, AKA Mr Data
Maulds Meaburn


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 Post subject: Re: December 2013
PostPosted: Mon Jan 13, 2014 8:03 pm 
Professor
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Joined: Mon Nov 02, 2009 8:52 pm
Posts: 7695
Location: Brampton
Altitude: 117m
Weather Station: Davis VP2
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Cumbria Weather Report data now available


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Paul C
Brampton. 117m ASL.
http://www.bramptonweather.co.uk
Imagehttps://twitter.com/#!/pacrabtree
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