uk.sci.weather (UK Weather) (uk.sci.weather) For the discussion of daily weather events, chiefly affecting the UK and adjacent parts of Europe, both past and predicted. The discussion is open to all, but contributions on a practical scientific level are encouraged.

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Old December 7th 18, 09:30 AM posted to uk.sci.weather
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Default [OBS] Ystrad, Rhondda - Fri 07 Dec 2018

0900z: 27008KT 15km Slight rain shower 1ST008 7CU012 (/SC056 /AC120 /CI250) 8.7/6.6 QFF 1001.0 rising.
SYNOP: 41365 72708 10087 20066 40010 53005 78065 87832 333 81708 87812=
Wet accurately describes last night. Thursday evening's persistent slight rain and drizzle was replaced by persistent moderate to heavy rain around 2230z as the next front approached. Rates picked up to heavy after 0200z, with a max rate of 15.6 mm/hr at 0241z, and an hourly total of 9 mm between 0317z and 0417z. Rates eased back down to moderate by 0545z. Cold front went through at 0725z, and the rain (now accompanied by drizzle) stopped by 0800z. Dry for a short time before a slight rain shower arrived from the west at 0845z. Thursday's extensive low stratus and poor visibility cleared on the passage of the front, and the skies are now much brighter and convective. Visibility has improved to good. Surface wind was southwesterly overnight, generally F3-4, but F5-6 at times for a few hours either side of midnight.

Yesterday's 55.2 mm has brought the December total so far to 127.4 mm, with the 10-day running total at 241.0 mm, and the 30-day total to 330.2 mm.

06/0900z to 07/0900z:
Max: 12.4 (0040z) [0900z-2100z max: 12.3 (1728z)]
Min: 8.7 (0858z)
Rain: 55.2 mm

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Freddie
Ystrad
Rhondda
148m AMSL
http://www.hosiene.co.uk/weather/
https://twitter.com/YstradRhonddaWx for hourly reports (very few tweets getting through currently)
Stats for the month so far: https://www.hosiene.co.uk/weather/st...201812DEC.xlsx

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Old December 7th 18, 11:50 AM posted to uk.sci.weather
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Default [OBS] Ystrad, Rhondda - Fri 07 Dec 2018

Good morning Freddie,

Just before reading your report of 55mm I looked at Bernard Burton's Wokingham report and though to myself - 8.6mm, ah, there's a reasonable rainfall total. All meteorology students should read both of your reports - I'm sure that people do not appreciate such contrasts, and they are quite difficult for all of us to believe at times!

Julian Molesey, Surrey
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Old December 7th 18, 12:34 PM posted to uk.sci.weather
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Default [OBS] Ystrad, Rhondda - Fri 07 Dec 2018

On Friday, 7 December 2018 11:50:23 UTC, wrote:
Good morning Freddie,

Just before reading your report of 55mm I looked at Bernard Burton's Wokingham report and though to myself - 8.6mm, ah, there's a reasonable rainfall total. All meteorology students should read both of your reports - I'm sure that people do not appreciate such contrasts, and they are quite difficult for all of us to believe at times!

Indeed! I have spent the past 25 years in the Shropshire rain shadow, so when I looked up estimated rainfall averages for this area before moving in I thought there had been a typo - moving from an area with 600-700 m annual average, to one with 2500 mm! But it is true - most fronts here give 15-20 mm. Orographic uplift of a warm conveyer ahead of a cold front will often give 5-10 mm/hr for several hours before the front arrives. As they say round here - when it rains, it rains! Incidentally, the Rhondda river - which is about 50 metres from my garden - rose almost a metre in a couple of hours. I got a flood alert text from the Welsh EA, so went to have a look. Although it had risen, it was still 3-4 metres below "banks full", so plenty of capacity for rainfall events such as these.

IIRC you hail from around here, don't you?

--
Freddie
Ystrad
Rhondda
148m AMSL
http://www.hosiene.co.uk/weather/
https://twitter.com/YstradRhonddaWx for hourly reports (very few tweets getting through currently)
Stats for the month so far: https://www.hosiene.co.uk/weather/st...201812DEC.xlsx

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Old December 7th 18, 12:46 PM posted to uk.sci.weather
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Default [OBS] Ystrad, Rhondda - Fri 07 Dec 2018

1200z: 27015KT 30km Recent rain shower 4CU020 (1CI250) 8.2/4.7 QFF 1002.2 rising.
SYNOP: 11580 42715 10082 2047 40022 52012 60031 72586 84201 333 84820=
A few slight rain showers this morning. Variable amounts of cumulus congestus, and a F4-5 westerly breeze - gusty at times. Very good visibility away from showers.

--
Freddie
Ystrad
Rhondda
148m AMSL
http://www.hosiene.co.uk/weather/
https://twitter.com/YstradRhonddaWx for hourly reports (very few tweets getting through currently)
Stats for the month so far: https://www.hosiene.co.uk/weather/st...201812DEC.xlsx
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Old December 7th 18, 03:41 PM posted to uk.sci.weather
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Default [OBS] Ystrad, Rhondda - Fri 07 Dec 2018

1500z: 25012KT 30km 2CU025 1CB030 7.8/4.0 QFF 1002.8 faling.
SYNOP: 41580 22512 10078 20040 40028 50006 70181 82900 333 82825 81930=
A few slight rain showers this afternoon, with variable amounts of convective cloud, very good visibility, and a F4 westerly wind which has just started to back WSW'ly. Maximum temperature so far today is 8.7 (0900z).

Update: moderate hail shower at 1520z - turned the ground white and was rather painful! Stones less than 5 mm.

--
Freddie
Ystrad
Rhondda
148m AMSL
http://www.hosiene.co.uk/weather/
https://twitter.com/YstradRhonddaWx for hourly reports (very few tweets getting through currently)
Stats for the month so far: https://www.hosiene.co.uk/weather/st...201812DEC.xlsx


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Old December 7th 18, 04:35 PM posted to uk.sci.weather
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Default [OBS] Ystrad, Rhondda - Fri 07 Dec 2018

IIRC you hail from around here, don't you?

Yes, Cardiff and Swansea, so just half of your ave ann rainfall. Growing up in the early '80s I could not believe Lamb's weather types showing a decline in the westerlies. As you say, those lingering cold fronts are the main culprit, bringing warm conveyor belt rain for hours on their eastern flank. Only since then have I realised that it was probably a rise in the SW weather type that drove the rainfall increase (at least on the wettest days) - or, to put another way, a rise in Tropical maritime as opposed to Polar maritime air masses.

Julian Molesey Surrey
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