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Rob K
  • Rob K
  • Advanced Member Topic Starter
21 August 2014 10:50:47

Just had a look at the overnight minima and several stations in southern England recorded subzero grass minima:


 


http://www.met.reading.ac.uk/~brugge/amextremes.html


 


12-hour values ending 2014Aug21-0600GMT 
Min Grass 12h Yesterday
Temp Min Rain Sun Location
(C) (C) (mm) (h)

5.6 3 .2 05.3 Shawbury
3.4 2 .0 //./ Shobdon
3.4 0 .2 Hereford Credenhill
4.2 -2 tr Pershore <------
5.5 3 tr //./ Coleshill
6.5 3 .0 //./ Church Lawford
5.3 3 .0 //./ Little Rissington
5.5 2 .2 05.7 Brize Norton
2.7 -1 .0 Benson <------
6.7 0 .2 High Wycombe
6.3 5 .0 05.4 Wittering
6.4 4 .0 //./ Holbeach
5.6 2 .0 Marham
8.1 .. .2 Weybourne
5.8 5 tr //./ Bedford
5.8 2 .0 //./ Rothamsted
5.0 1 tr 06.4 Wattisham
5.2 3 .2 Andrewsfield
8.0 5 .0 Shoeburyness
8.9 6 001.0 Chivenor
6.8 1 .0 03.4 Filton
6.3 4 .0 //./ Liscombe
11.5 7 .0 Scilly St Marys
8.0 3 .0 07.4 Camborne
6.4 1 .0 Culdrose RNAS
7.8 4 .0 //./ Cardinham
6.0 2 .0 Plymouth
5.9 3 tr Dunkeswell
4.8 1 .0 11.8 Yeovilton
6.0 2 .0 Northolt
5.5 -1 .0 06.6 Lyneham <------
3.5 -1 .0 Larkhill <------
4.2 -1 .0 Boscombe Down <------

4.5 3 .0 Middle Wallop
6.8 2 .2 07.8 Odiham
4.7 1 .0 South Farnborough
3.6 2 .0 08.1 Charlwood
.0 St James Park
7.6 3 .0 07.0 Heathrow
7.1 2 .0 //./ Kenley
8.3 .. Gravesend
9.0 .. Langdon Bay
7.8 5 .0 //./ Manston
12.1 10 .0 Isle of Portland
2.7 -1 .0 10.3 Bournemouth Hurn <------
10.7 8 .0 St Catherines Point
5.7 1 .0 //./ Thorney Island
8.0 .. Solent MRSC
5.0 .. .0 Shoreham
6.1 3 .0 07.2 Herstmonceux

Yateley, NE Hampshire, 73m asl
"But who wants to be foretold the weather? It is bad enough when it comes, without our having the misery of knowing about it beforehand." — Jerome K. Jerome
Frost Hollow
21 August 2014 11:04:18

There will be some interesting minima over the weekend with some air forts up here for sure Saturday night

doctormog
21 August 2014 15:30:34
I'm not sure about widespread but definitely notably chilly for August.

http://www.weatheronline.co.uk/weather/maps/current?LANG=en&CONT=euro&LAND=UK®ION=0003&SORT=2&UD=0&INT=24&TYP=tminboden&ART=kartealle&RUBRIK=akt&DATE=--&CEL=C&SI=mph 

Looks like a chilly ground min at Great Dun Fell... 😉
Quantum
21 August 2014 16:08:55

Why is benson always on that list. Its almost like someone cursed it. 


2023/2024 Snow days (approx 850hpa temp):
29/11 (-6), 30/11 (-6), 02/12 (-5), 03/12 (-5), 04/12 (-3), 16/01 (-3), 18/01 (-8), 08/02 (-5)

Total: 8 days with snow/sleet falling.

2022/2023 Snow days (approx 850hpa temp):

18/12 (-1), 06/03 (-6), 08/03 (-8), 09/03 (-6), 10/03 (-8), 11/03 (-5), 14/03 (-6)

Total: 7 days with snow/sleet falling.

2021/2022 Snow days (approx 850hpa temp):

26/11 (-5), 27/11 (-7), 28/11 (-6), 02/12 (-6), 06/01 (-5), 07/01 (-6), 06/02 (-5), 19/02 (-5), 24/02 (-7), 30/03 (-7), 31/03 (-8), 01/04 (-8)
Total: 12 days with snow/sleet falling.
doctormog
21 August 2014 16:13:27

Why is benson always on that list. Its almost like someone cursed it. 

Originally Posted by: Quantum 



It's a "frost hollow" - or to look at it simplistically because of the nature of the site the denser colder air "pools" there.
Medlock Vale Weather
21 August 2014 17:54:20

Anyone know what happened to Redhill? I know that station was a frost hollow.


Alan in Medlock Valley - Oldham's frost hollow. 103 metres above sea level.
What is a frost hollow? http://www.weatheronline.co.uk/reports/wxfacts/Frost-hollow.htm 
Essan
21 August 2014 18:01:35


Why is benson always on that list. Its almost like someone cursed it. 


Originally Posted by: doctormog 



It's a "frost hollow" - or to look at it simplistically because of the nature of the site the denser colder air "pools" there.

Originally Posted by: Quantum 



So, for some reason, is Pershore (Throckmorton) - it is often several degrees colder than anywhere else in the area (including Pershore College) and not at all representative.


Redhill was dropped some years ago, I think because it was so unrepresentative .....   Pershore on the other hand is a CET station


Andy
Evesham, Worcs, Albion - 35m asl
Weather & Earth Science News 

Anyone who is capable of getting themselves made President should on no account be allowed to do the job - DNA
Cumbrian Snowman
21 August 2014 18:07:06


Day after Tomorrow stuff on GDF, perhaps it was -2.7   just forgot the decimal point ?


 


Rob K
  • Rob K
  • Advanced Member Topic Starter
21 August 2014 18:11:49


Anyone know what happened to Redhill? I know that station was a frost hollow.


Originally Posted by: Medlock Vale Weather 


 


It closed down some years ago. 2006, I think, and was replaced with Charlwood. Thread on NW: http://forum.netweather.tv/topic/56149-meto-update-scientist-acquires-raw-station-data/page-4


 


Interesting little snippet here on the location: http://f1.nwstatic.co.uk/forum/uploads/monthly_08_2009/post-2-12497458621374.jpg


Yateley, NE Hampshire, 73m asl
"But who wants to be foretold the weather? It is bad enough when it comes, without our having the misery of knowing about it beforehand." — Jerome K. Jerome
Medlock Vale Weather
21 August 2014 18:13:09



Why is benson always on that list. Its almost like someone cursed it. 


Originally Posted by: Essan 



It's a "frost hollow" - or to look at it simplistically because of the nature of the site the denser colder air "pools" there.

Originally Posted by: doctormog 



So, for some reason, is Pershore (Throckmorton) - it is often several degrees colder than anywhere else in the area (including Pershore College) and not at all representative.


Redhill was dropped some years ago, I think because it was so unrepresentative .....   Pershore on the other hand is a CET station


Originally Posted by: Quantum 


Ah, I see. It's a bit like here where we can be 5C colder than places just a few miles away. This is far more prominant at night under clear skies and calm winds during cool/cold spells. To some people that is unrepresentative but it gives an indication of how conditions especially temperatures can be incredibly varied over relative short distances due to the topography of the land.


Alan in Medlock Valley - Oldham's frost hollow. 103 metres above sea level.
What is a frost hollow? http://www.weatheronline.co.uk/reports/wxfacts/Frost-hollow.htm 
Medlock Vale Weather
21 August 2014 18:15:36



Anyone know what happened to Redhill? I know that station was a frost hollow.


Originally Posted by: Rob K 


 


It closed down some years ago. 2006, I think, and was replaced with Charlwood. Thread on NW: http://forum.netweather.tv/topic/56149-meto-update-scientist-acquires-raw-station-data/page-4


 


Interesting little snippet here on the location: http://f1.nwstatic.co.uk/forum/uploads/monthly_08_2009/post-2-12497458621374.jpg


Originally Posted by: Medlock Vale Weather 


Cheers Rob


Alan in Medlock Valley - Oldham's frost hollow. 103 metres above sea level.
What is a frost hollow? http://www.weatheronline.co.uk/reports/wxfacts/Frost-hollow.htm 
bledur
21 August 2014 19:22:46

Hurn airport near Bournemouth also gets lower minimums than places close by. As it says in the article about Redhill it is due to the sandy soil and topography.

DEW
  • DEW
  • Advanced Member
21 August 2014 19:45:26


Hurn airport near Bournemouth also gets lower minimums than places close by. As it says in the article about Redhill it is due to the sandy soil and topography.


Originally Posted by: bledur 


Besides the 'usual suspects' below zero with their sandy soil and topography, I find some of the zeroes just as impressive, when they come from coastal locations where the sea ought to be giving them a boost. St Catherine's Down, IoW - you could be sticking out into the sea much further south than that - and it's on chalk, not sand..


War does not determine who is right, only who is left - Bertrand Russell

Chichester 12m asl
Caz
  • Caz
  • Advanced Member
21 August 2014 21:01:53




Why is benson always on that list. Its almost like someone cursed it. 


Originally Posted by: Medlock Vale Weather 



It's a "frost hollow" - or to look at it simplistically because of the nature of the site the denser colder air "pools" there.

Originally Posted by: Essan 



So, for some reason, is Pershore (Throckmorton) - it is often several degrees colder than anywhere else in the area (including Pershore College) and not at all representative.


Redhill was dropped some years ago, I think because it was so unrepresentative .....   Pershore on the other hand is a CET station


Originally Posted by: doctormog 


Ah, I see. It's a bit like here where we can be 5C colder than places just a few miles away. This is far more prominant at night under clear skies and calm winds during cool/cold spells. To some people that is unrepresentative but it gives an indication of how conditions especially temperatures can be incredibly varied over relative short distances due to the topography of the land.


Originally Posted by: Quantum 

Exactly what I keep pointing out as the same happens here and it's pretty obvious topography has a lot to do with it.  We very rarely match the temps or weather of our nearest official station at Nottingham, 20 miles away.


One afternoon in 2010, our parish got totally snowed in very quickly and a colleague at our Nottingham office rang to say they were sending me a delivery.  I explained they wouldn't get through to us because the roads were blocked and they were very surprised because they'd only had a dusting there.


Still, they have to put the stations somewhere and no doubt they roughly represent a region on average.


Market Warsop, North Nottinghamshire.
Join the fun and banter of the monthly CET competition.
Medlock Vale Weather
21 August 2014 22:23:07





Why is benson always on that list. Its almost like someone cursed it. 


Originally Posted by: Caz 



It's a "frost hollow" - or to look at it simplistically because of the nature of the site the denser colder air "pools" there.

Originally Posted by: Medlock Vale Weather 



So, for some reason, is Pershore (Throckmorton) - it is often several degrees colder than anywhere else in the area (including Pershore College) and not at all representative.


Redhill was dropped some years ago, I think because it was so unrepresentative .....   Pershore on the other hand is a CET station


Originally Posted by: Essan 


Ah, I see. It's a bit like here where we can be 5C colder than places just a few miles away. This is far more prominant at night under clear skies and calm winds during cool/cold spells. To some people that is unrepresentative but it gives an indication of how conditions especially temperatures can be incredibly varied over relative short distances due to the topography of the land.


Originally Posted by: doctormog 

Exactly what I keep pointing out as the same happens here and it's pretty obvious topography has a lot to do with it.  We very rarely match the temps or weather of our nearest official station at Nottingham, 20 miles away.


One afternoon in 2010, our parish got totally snowed in very quickly and a colleague at our Nottingham office rang to say they were sending me a delivery.  I explained they wouldn't get through to us because the roads were blocked and they were very surprised because they'd only had a dusting there.


Still, they have to put the stations somewhere and no doubt they roughly represent a region on average.


Originally Posted by: Quantum 


Indeed, over the years including 1962-63 I've noticed that the Pennine hills of Bleaklow and Kinder Scout block snow for parts of South Manchester, but just a few miles north and the snow seems to get over more freely over slightly smaller hills and it covers the North Manchester, Oldham and Rochdale areas more easily. This was especially apparent during Winter 2012-13, when TWO members in South Manchester were frustrated with a lack of snow, yet here it was like a Winter wonderland, I even showed a motorway webcam a few times over the Winter near here, they were gobsmacked at the difference of only 10 miles or so.


Alan in Medlock Valley - Oldham's frost hollow. 103 metres above sea level.
What is a frost hollow? http://www.weatheronline.co.uk/reports/wxfacts/Frost-hollow.htm 
Rob K
  • Rob K
  • Advanced Member Topic Starter
22 August 2014 11:02:21


Besides the 'usual suspects' below zero with their sandy soil and topography, I find some of the zeroes just as impressive, when they come from coastal locations where the sea ought to be giving them a boost. St Catherine's Down, IoW - you could be sticking out into the sea much further south than that - and it's on chalk, not sand..


Originally Posted by: DEW 


St Catherines had a grass min of 8C, not zero. Think you might have been looking at the rainfall column? 


Another couple of grass frosts last night with Leuchars and Spadeadam both recording "-0", i.e. between -0.1 and -0.5C.


Yateley, NE Hampshire, 73m asl
"But who wants to be foretold the weather? It is bad enough when it comes, without our having the misery of knowing about it beforehand." — Jerome K. Jerome
Russwirral
22 August 2014 11:07:33
crazy to think that we went the majority of last winter without a ground frost.

And yet we get one in August.

love the weather in Britain.
picturesareme
22 August 2014 15:41:47


Besides the 'usual suspects' below zero with their sandy soil and topography, I find some of the zeroes just as impressive, when they come from coastal locations where the sea ought to be giving them a boost. St Catherine's Down, IoW - you could be sticking out into the sea much further south than that - and it's on chalk, not sand..

Originally Posted by: Rob K 


St Catherines had a grass min of 8C, not zero. Think you might have been looking at the rainfall column?UserPostedImage
Another couple of grass frosts last night with Leuchars and Spadeadam both recording "-0", i.e. between -0.1 and -0.5C.

Originally Posted by: DEW 



1C at Thorney though.

Thorney is basically a bit of flat marshy land, its surrounded by sea water that's circa 18-19C at the moment.
DEW
  • DEW
  • Advanced Member
23 August 2014 06:51:32


Besides the 'usual suspects' below zero with their sandy soil and topography, I find some of the zeroes just as impressive, when they come from coastal locations where the sea ought to be giving them a boost. St Catherine's Down, IoW - you could be sticking out into the sea much further south than that - and it's on chalk, not sand..

Originally Posted by: picturesareme 


St Catherines had a grass min of 8C, not zero. Think you might have been looking at the rainfall column?UserPostedImage
Another couple of grass frosts last night with Leuchars and Spadeadam both recording "-0", i.e. between -0.1 and -0.5C.

Originally Posted by: Rob K 



1C at Thorney though.

Thorney is basically a bit of flat marshy land, its surrounded by sea water that's circa 18-19C at the moment.

Originally Posted by: DEW 


oops But Thorney is unexpected.


War does not determine who is right, only who is left - Bertrand Russell

Chichester 12m asl
picturesareme
23 August 2014 08:58:17


Besides the 'usual suspects' below zero with their sandy soil and topography, I find some of the zeroes just as impressive, when they come from coastal locations where the sea ought to be giving them a boost. St Catherine's Down, IoW - you could be sticking out into the sea much further south than that - and it's on chalk, not sand..

Originally Posted by: DEW 


St Catherines had a grass min of 8C, not zero. Think you might have been looking at the rainfall column?UserPostedImage
Another couple of grass frosts last night with Leuchars and Spadeadam both recording "-0", i.e. between -0.1 and -0.5C.

Originally Posted by: picturesareme 



1C at Thorney though.

Thorney is basically a bit of flat marshy land, its surrounded by sea water that's circa 18-19C at the moment.

Originally Posted by: Rob K 


oops But Thorney is unexpected.

Originally Posted by: DEW 



Indeed very unexpected and unusual.
23 August 2014 09:13:52

Bournemouth Hurn managed a grass frost again this morning with -1C and an air temperature of 4.0C. Benson had 3.4C with a -0C grass temperature so also just managed a frost as did a few other places.


Coldest air temperature seems to be Shap Fell with 1.3C

ARTzeman
23 August 2014 11:39:51

Expecting the frost For Sunday morning.....






Some people walk in the rain.
Others just get wet.
I Just Blow my horn or trumpet
bledur
23 August 2014 13:23:44


Bournemouth Hurn managed a grass frost again this morning with -1C and an air temperature of 4.0C. Benson had 3.4C with a -0C grass temperature so also just managed a frost as did a few other places.


Coldest air temperature seems to be Shap Fell with 1.3C


Originally Posted by: Global Warming 

. Yes frost here this morning in the lower lying fields. I am about 20 miles north of Hurn. Thats two frosts so far in this spell. If we get another tonight that will be the most frosts i can remember in August in 50 odd years.

23 August 2014 20:00:10

It is going to be a real chilly one tonight. At 1900 Benson was already 2.5C colder than at the same time yesterday evening. Exactly the same with my readings as well.


Aviemore already at 7.6C at 2000

24 August 2014 07:14:00

Katesbridge in Northern Ireland recorded an air minimum of at least -1.8C this morning and possibly lower.


That is the first air frost of the season. Lowest August minimum for Northern Ireland on record.


Coldest in Southern England was Benson at 2.1C.


Places like Pershore, Benson and Bournemouth AP recording their third grass frost in the last week.

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