20th August 2011 Weather & General Chat

[Coast]

16.2 DgC

1019.6 mb rising 0.6 mb/hr

Wind 1.8 mph gusting 8.7 mph max SW

DP 15.4 DgC

Humidity 95%

No rain last 24 hours

Cloud base 331 ft

Started out really sunny, but the cloud has now moved in. DP high and feeling a little humid already

[johnholmes]

convection getting going now with 5/8 Cu over the past hour from a mix of thick Ci and Contrails earlier, lowest temperature was 13.3C its up to 19.2C in a fairly light brezze from the WNW

[Terminal Moraine]

Apart from a couple of very light showers early yesterday evening the night was dry and mild with clear periods.

A sunny start to this morning for an hour or so before St and Scu spread in from the south.

Currently dry and cloudy with 7 oktas St and Scu.

The temp' is 14.8c after a min' of 11.8c and a grass min' of 9.6c

Rainfall in 24 hrs ending 0800 g.m.t, trace

Mean wind speed, 6 mph S

Vis', 18 km.

[SteveB]

Dry cloudy start,

Temp 15.9c

Humidity 86%

Dewpoint 13.6c

[Kent Snow]

18.3C, few cumulus, altostratus, wind from the SW, 1019mb.

[Methuselah]

Warm and bright, 18C...

[MP-R]

Much milder night. 8.6C on Friday morning - 15.2C this morning and now 17.4C but largely cloudy with occasional sunny spells. Hoping the rain doesn't come this way!!

[J10]

Completely overcast with further cloud advancing from the South West.

Here's a question not quite worthy of its own thread.

For those without a weather station recording sunshine. http://www.guardian.co.uk/news/2011/apr/21/weatherwatch-sunshine-solar-radiation-clouds

What is the tipping point between being sunny and not, so would I be right in thinking that if the sun is visible through the clouds, then this would register as being sunny. Alternatively if it is bright, but you cannot see he sun, then this wouldn't count.

Obviously such confusion doesn't arise, when there is bright sunshine or if it is completely overcast.

[Polar Continental]

Saturday 20th August 2011:

The night has been mild and cloudy, though dry. The morning to observation has been mainly cloudy with a few bright spells, feeling warm and humid.

7 Oktas: Stratocumulus, Cumulus mediocris.

Temperature: 18.5°C

Humidity: 70%

Dew point 12.8°C

Wind Direction: Force 4 SSW

Barometer: 1018mb steady.

Today's readings for the 24 hrs up to 0:900 GMT:

Maximum daytime temperature yesterday: 22.9°C

Minimum temperature overnight: 13.0°C

24-hour maximum = 22.9°C

24-hour minimum: 13.0°C

Minimum temperature on grass: 11.6°C

Rainfall total: 0.0 mm

Yesterday:

Variable cloud overnight prevented it turning as chilly as recent nights, low 8.5c. The day dawned with misty conditions over the near by fields. Bright and dry with sunshine so far this morning. The day stayed bright with sunny spells, feeling warm by afternoon as the temperature reached 22.9c. The early evening saw a few scattered showers in the area, though none was noted at this station.

August: 2011 so far:

Mean temperature: 16.6c (+ 0.2c) of the local average)

Maximum temperature: 28.4 on the 3rd.

Minimum temperature: 6.4c on the 17th

Grass Minimum: 4.5c on the 17th

Rainfall = 14.4 mm

Wettest 24 hours, 4.3mm on the 7th.

Maximum wind gust: 42 mph NNW on the 8th.

2011 so far:

Maximum temperature: 29.1 on the 27th June.

Minimum temperature: -7.0c on the 31st Jan

Grass Minimum: -10.4c on the 31st Jan

Rainfall = 271.5 mm

Wettest 24 hours, 19.1mm on the 12th June

Maximum wind gust: 56.8mph, SSE 7th Feb

[Terminal Moraine]

Completely overcast with further cloud advancing from the South West.

Here's a question not quite worthy of its own thread.

For those without a weather station recording sunshine. http://www.guardian....adiation-clouds

What is the tipping point between being sunny and not, so would I be right in thinking that if the sun is visible through the clouds, then this would register as being sunny. Alternatively if it is bright, but you cannot see he sun, then this wouldn't count.

Obviously such confusion doesn't arise, when there is bright sunshine or if it is completely overcast.

It's an interesting question Jackone. Electronic sunshine recorders are pre-set to register bright sunshine at the number of lumens determined by the W.M.O to constiture 'bright sunshine'. In practice this means that weak sunshine through a veil of altostratus will not register, even if the disc of the sun is visible behind the cloud. A sheet of broken altocumulus with intermittent bright sunshine mixed with longer spells of hazy sunshine will trigger the recorder intermittently.

A disadvantage of the Campbell Stokes recorder was that the burn mark tended to spread slightly beyond the point at which the sun stopped shining. This was not much of a problem during continuous sunshine or long sunny periods as an allowance could be made for it, but on days with sunshine broken by short cloudy interludes the burn marks tended to merge, making it difficult for the observer to accurately measure the actual sunshine duration.

[Bottesford]

A much warmer start with a min of 16c and currently 21.5c - much more summer feeling today gladly.

A fairly sunny morning with some clouds around.

On the sunshine question - bright with 'light bulb' sun isn't sunny in my book.

To count as sunny I'd say:

- You should be able to see shadows on the ground with a contrast between areas in sun and areas in shade

- Be unable to look at the sun directly

- Feel the warmth coming from the sun (perhaps excluding sunrise/sunset)

I think point 1 is the clearest cut although times around sunrise and sunset will make it harder to determine.

[Milhouse]

Not totally blue skies but some good breaks allowing occasional sunny spells. Another pleasantly warm day to come with a current temp of 20.4c.

[Jon Somerset]

Cool at about 17C and wet here at present after a dry cloudy start. All forecasts point to an improvement over the next couple of hours - fingers crossed!

[Zenarcher]

Castlebay Isle Of Barra

Outdoor Temp 15.1°C

Outdoor Humidity 87%

Pressure 1007mb

Wind direction South West

Wind speed 32mph

Gust 45mph

Cloud Height 970ft

Wet Bulb 13.8°C

Rainfall Today 1.0mm

Rainfall This Month 57.5mm

Dew Point 12.7°C

Wind Chill 8°C

Weather Cloudy showers dull

[Jon Somerset]

Vast improvement from about 2.30 p.m. Quite a bit of stratus about but there has been more than two hours of sun, which combined with warmer air behind front has meant we're now up at about 21/22C.

[SteveB]

Pressure 1011.4hPa

Temp 19.8c

Max Temp 20.3c

Min Temp 15.1c

Humidity 78%

Dewpoint 15.8c

Rainfall 0.5mm

Monthly Rainfall 44.5mm

[AderynCoch]

After a promising bright start, the thick cloud and frequent showers rolled in. Hammering it down as I speak, and very gloomy.

Looks like yet another disappointing August in the bag.

[Terminal Moraine]

A predominantly dry and warm day with just a few pitifully light showers between 1610 and 1640 g.m.t, barely enough to damp the yard. It was a sunny start to the morning but cloud rolled in from the south by 0700 and there was a good deal of cloud for the rest of the day, although with some short sunny intervals at times around midday.

At 1800 g.m.t;

Temp', 16.0c

Max' today, 20.0c

Min' last night 11.8c

Grass min', 9.6c

Rainfall from 0800-1800 g.m.t, trace

Sunshine today, 1.91 hrs

Mean wind speed, 12 mph SW

Highest gust today, 37 mph S at 1422 g.m.t

7 oktas Scu, St and Acu

Vis', over 80 km.

[J10]

A mostly cloudy day with some heavy drizzle at times. Feeling quite cool

Cheers for the reply with regard to the sun question above.

[TonyH]

Mostly cloudy today. Mild last night, rather humid.

Sunny intervals before 0800. Occasional drizzle to 1500, then some sunny intervals to about 1700.

Moderate to fresh southerly breeze.

Min: 14.3c @ 0700

Max: 19.3c @ 1530

Rain yesterday: 1.0mm

Rain since 10am: 1mm approx.

Currently: Cloudy.

Temp: 15c

RH: 87%

Pressure: 1014mbar, steady.

Edited August 20, 2011 by Tonyh

[Stargazer]

Dry with sunny intervals morning and afernoon; a band of rain came through for 2 hours around lunchtime. Maximum 21.0, minimum 12.8. Wind light NW.

Yesterday: dry with sunny periods after a cool and foggy start. Maximum 21.2, minimum 8.2. Wind light W.

[Bottesford]

A dry and warm feeling day with some decent spells of sunshine.

A 'good' day for this year as we've seen the sun. Afternoon was cloudy as per usual but still at least we got some sun.

24.1c max so we did quite well. 19c at 2140 so again doing ok.

[jean91]

i don't know if i can post here as am in paris.Today max in Paris Montsouris 30.8C with a humidex of 34.8 that at 6 pm local time

at 23OO it is still 25.3 thundery showers are not too far. clound cover most of the sky now. probably one of the warmest night this year apart from the 27th june.

am not still sleeping.........................................