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Polar Maritime

Wednesday 12 December 2012 - Weather And General Chat.

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Very cold and clear

Current Temp -5.1c

Dew Point -5.7c

Wind Chill -4.9c

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Cold frosty start to the day. Coldest of the new winter.

Temp -2.3C

Wind F1 S

Rainfall nil

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Morning..

Very clear and cold morning here, with freezing fog in the valleys.

Temp -4.7c

Due Point -5.2c

Wind chill -4.1c on a 2mph S/E

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no fog with patchy Ci and a low currently of -4.1C

the coldest since last winter sometime in February

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-3.3°C

1021.9 mb falling 0.4 mb/hr

Wind 0.0 mph gusting 6.2 mph NW

Windchill -3.3°C

DP -4.8°C

Humidity 89%

No rain last 24 hours

Cloud base 640 ft

Very cold but a nice clear sunrise just starting

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The Davis on the house roof recording some remarkably rapid variations in temperature this morning. There's been an area of fog in the valley for most of the night, it's upper limit mostly around 230m but occasionally as high as 290m, and tongues of cold air from its upper surface intermittently make it as far as where I am. The result is the temperature varying between -3.0c and -5.7c within the space of two minutes. This has happened 4 times in the last hour.

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Temperature

Temperature -5.4 °C

Windchill -5.4 °C

Dew Point -6.3 °C

Wind

Wind Speed (avg) 0.0 mph

Wind Speed (gust) 1.0 mph

Wind Bearing 208° SSW

Conditions

Pressure 1021.98 mb (Falling -0.35 mb/hr)

Clouds Clear

Moisture

Humidity 94%

Rainfall 0 mm

Thick hoar frost

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A dry and mainly clear night but with Ci developing during the early hours. Freezing fog developed in the valleys early yesterday evening and intermittently got as high as 290 m or so, mostly though it was below 230m.

The fog level had a significant effect on the temperature. The minimum 20 feet above the house roof on the Davis was -5.7c, in the screen in my back garden it was -5.9c but 20 m higher in my screen on the moor, where the fog never reached, it was -4.6c.

Currently dry with occasional watery sunshine and a layer of freezing fog persisting below 200m.

At 0900;

Temp', -3.4c

24 hr max', 2.9c

24 hr min', -4.6c

Grass min', -9.6c

Rainfall in 24 hrs ending 0900, nil

Mean wind speed, 11 mph W

6 oktas Ci, Cs and Ac

Vis' 800m ( above the fog to the north vis', 30 km )

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Wednesday 12th December 2012:

A continued force 2 to 3 south-westerly wind overnight and low cloud stopped the temperature falling as low as recently, though still –2.9 and –6.5c on the grass, so a penetrating moderate frost. Thick freezing fog descended over this location around 07:00 GMT as the wind fell very light again.

Today's readings for the 24 hrs up to 09:00 GMT:

Maximum temperature to 18:00 GMT yesterday: 2.4°C

Minimum temperature overnight: -2.9°C

24-hour maximum 2.4°C

24-hour minimum: -4.1°C

Minimum temperature on grass: -6.5°C

Maximum wind gust: (Midnight to Midnight) 8.1mph W

Rainfall total: tr.mm.

Current Conditions:

8 Oktas: Freezing fog, Stratus.

Visibility: very poor < 100 yds.

Temperature: -2.9°C

Humidity: 93.4%

Dew point –3.8°C

Wind Direction: Force 1 S

Barometer 1021.4 mb: Trend: falling.

Yesterday:

Clear and cold overnight with a moderate to severe frost, low –4.3c with –8.3c on the grass. Clear and frosty to observation. The morning saw good sunny spells. The early afternoon saw freezing fog and low cloud drifting in from the south. Frost persisted.

December 2012 so far:

Mean temperature: 1.6c (-2.7c) of local average)

Maximum temperature: 8.0c on the 9th

Minimum temperature: -5.0c on the 6th

Grass Minimum: -8.6c on the 6th

Rainfall 22.5 mm

Wettest 24 hours 8.9 mm on the 6th

Maximum wind gust: 22.1 mph WSW on the 3rd.

2012 so far

Maximum temperature: 29.0c on the 24th July.

Minimum temperature: -8.9c on the 4th Feb

Grass Minimum: -11.2c on the 4th Feb

Rainfall = 879.8 mm

Wettest 24 hours, 30.7mm on the 24th November

Maximum wind gust: 48.6mph, NW 5th Jan

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A dry and mainly clear night but with Ci developing during the early hours. Freezing fog developed in the valleys early yesterday evening and intermittently got as high as 290 m or so, mostly though it was below 230m.

The fog level had a significant effect on the temperature. The minimum 20 feet above the house roof on the Davis was -5.7c, in the screen in my back garden it was -5.9c but 20 m higher in my screen on the moor, where the fog never reached, it was -4.6c.

Currently dry with occasional watery sunshine and a layer of freezing fog persisting below 200m.

At 0900;

Temp', -3.4c

24 hr max', 2.9c

24 hr min', -4.6c

Grass min', -9.6c

Rainfall in 24 hrs ending 0900, nil

Mean wind speed, 11 mph W

6 oktas Ci, Cs and Ac

Vis' 800m ( above the fog to the north vis', 30 km )

Blimey TM, a very low grass minimum, i would think unusual for your location, more akin to the bottom of the valley.

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Thanks for the detailed summery TM, most interesting to say the least, some lovely inversions this morning in our area to.

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Bitterly cold and frosty with frozen ground and increasing sunshine after a cloudy mornig including a few light flurries.

0.3c after -4.5c first thing.

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Blimey TM, a very low grass minimum, i would think unusual for your location, more akin to the bottom of the valley.

Yes, second lowest this year, only Feb' 11th with -10.2c was lower and that was over 6cm of frozen snow.

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Not really that cold overnight with a temp at midnight of 0.7C and min temp of -1.2C despite clear skies for most of it.

It remained clear this morning before turning partly cloudy during the afternoon. Very cold in the daylight hours with a high of just 0.1C.

Currently -0.2C and 96% humidity. Theres a steady breeze which is unusual for such a cold day.

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Weather: Cloudy dry.

Temp: 5c.

Wind: 12mph South East.

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15.50GMT

Corfe Mullen Lat.50.773 Long -2.023 ASL 160ft

Observations since midnight:

Current conditions : a fine dry day with plenty of sunny periods and variable cloud but feeling cold.

current temp...............................2.6°C

feels like.....................................0.5°C

temp trend ................................-0.5°C/hr

min temp ...................................-2.3°C

max temp....................................4.2°C

pressure....................................1015.0mb

pressure trend...........................falling -0.7 mb/hr

max pressure............................1025.9 mb

min pressure.............................1014.9 mb

humidity....................................78%

dewpoint ..................................-0.9°C

wind......................................... 1.0 mph SE

gust...........................................5.3 mph SSE

rain............................................0 mm

rain this month.................... ...11.0mm

cloud cover...............................3/5

cloud base................................1412ft

visibility.....................................12miles

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it was -5.7c here last night under cloudy skies, why was it so cold under cloud cover? usually if its cloudy the temps stays at around 0c or just above in cold spells

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Freezing fog lifted by mid-morning but it remained cloudy all day and very cold. The coldest day since 3 December 2010 and the second coldest here in my 10 year record. Maximum -1.1, minimum -3.8. Wind calm.

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wow, what a cold day, no fog and dry all day with hazy sunshine through thick Ci with a max of just 0.4C that is the lowest since 21/12/10

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Can't give a max temp as we've just moved out of the minus zone for the first time today thanks to this stubborn cloud.

Don't see how it's forecast to be <-4C tonight....

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