High Wycombe has been reporting this nonsense for hours. Sigh!

--
Graham P Davis, Bracknell, Berks. Web-site: http://www.scarlet-jade.com/
"Nobody can get the truth out of me because even I don't know what it
is. I keep myself in a constant state of utter confusion." [Col. Flagg]
OS: Linux [openSUSE Tumbleweed]

Graham P Davis wrote:

High Wycombe has been reporting this nonsense for hours. Sigh!


My AWS has lots of rainfall 'saved up' in the funnel in the form of
snow. When the temperature finally rises it'll no doubt indicate a day
of mod/hvy rain, even though there may be no rainfall at all. Never
take anything at face value!

--
Norman Lynagh
Tideswell, Derbyshire
303m a.s.l.
https://peakdistrictweather.org
Twitter: @TideswellWeathr

On Sunday, 10 December 2017 11:07:17 UTC, Graham P Davis wrote:
High Wycombe has been reporting this nonsense for hours. Sigh!

--
Graham P Davis, Bracknell, Berks. Web-site: http://www.scarlet-jade.com/
"Nobody can get the truth out of me because even I don't know what it
is. I keep myself in a constant state of utter confusion." [Col. Flagg]
OS: Linux [openSUSE Tumbleweed]

You're quite right, as an ex-observer heavy snow would mean a visibility of a 1000 metres or less.

On Sunday, 10 December 2017 11:21:32 UTC, wrote:
On Sunday, 10 December 2017 11:07:17 UTC, Graham P Davis wrote:
High Wycombe has been reporting this nonsense for hours. Sigh!

--
Graham P Davis, Bracknell, Berks. Web-site: http://www.scarlet-jade.com/
"Nobody can get the truth out of me because even I don't know what it
is. I keep myself in a constant state of utter confusion." [Col. Flagg]
OS: Linux [openSUSE Tumbleweed]

You're quite right, as an ex-observer heavy snow would mean a visibility of a 1000 metres or less.

Then again in snow showers you can get 50 km in one direction and 500 m in another...

wrote:

On Sunday, 10 December 2017 11:07:17 UTC, Graham P Davis wrote:
High Wycombe has been reporting this nonsense for hours. Sigh!

--
Graham P Davis, Bracknell, Berks. Web-site:
http://www.scarlet-jade.com/ "Nobody can get the truth out of me
because even I don't know what it is. I keep myself in a constant
state of utter confusion." [Col. Flagg] OS: Linux [openSUSE
Tumbleweed]

You're quite right, as an ex-observer heavy snow would mean a
visibility of a 1000 metres or less.

In Tideswell, I find that moderate snow often reduces visibility to
300-500m. Heavy snow would almost always have a vis of less than 300m.

Heavy snow is defined as snow accumulating at a rate of more than 4
cm/hr. That doesn't often happen here.

--
Norman Lynagh
Tideswell, Derbyshire
303m a.s.l.
https://peakdistrictweather.org
Twitter: @TideswellWeathr

On 10/12/17 11:27, Norman Lynagh wrote:
wrote:

On Sunday, 10 December 2017 11:07:17 UTC, Graham P Davis wrote:
High Wycombe has been reporting this nonsense for hours. Sigh!

--
Graham P Davis, Bracknell, Berks. Web-site:
http://www.scarlet-jade.com/ "Nobody can get the truth out of me
because even I don't know what it is. I keep myself in a constant
state of utter confusion." [Col. Flagg] OS: Linux [openSUSE
Tumbleweed]

You're quite right, as an ex-observer heavy snow would mean a
visibility of a 1000 metres or less.

In Tideswell, I find that moderate snow often reduces visibility to
300-500m. Heavy snow would almost always have a vis of less than 300m.

Heavy snow is defined as snow accumulating at a rate of more than 4
cm/hr. That doesn't often happen here.


When I started observing at Wyton, the guidelines I was given was 1500m
or below for moderate snow and 200m for heavy.

The heaviest snow I've seen reduced the visibility below 50m - a bit
daunting when you're just having to start driving from Stowmarket to
Stansted for a night shift! There had been about 10cm accumulated at
Stowmarket in less than an hour.

The heaviest snow back at my old home of Rushden was an average of 15cm
per hour over a 4 hour period. I missed that as I was at Bracknell.

--
Graham P Davis, Bracknell, Berks. Web-site: http://www.scarlet-jade.com/
"Nobody can get the truth out of me because even I don't know what it
is. I keep myself in a constant state of utter confusion." [Col. Flagg]
OS: Linux [openSUSE Tumbleweed]

On Sunday, 10 December 2017 11:59:22 UTC, Graham P Davis wrote:
On 10/12/17 11:27, Norman Lynagh wrote:
wrote:

On Sunday, 10 December 2017 11:07:17 UTC, Graham P Davis wrote:
High Wycombe has been reporting this nonsense for hours. Sigh!

--
Graham P Davis, Bracknell, Berks. Web-site:
http://www.scarlet-jade.com/ "Nobody can get the truth out of me
because even I don't know what it is. I keep myself in a constant
state of utter confusion." [Col. Flagg] OS: Linux [openSUSE
Tumbleweed]

You're quite right, as an ex-observer heavy snow would mean a
visibility of a 1000 metres or less.

In Tideswell, I find that moderate snow often reduces visibility to
300-500m. Heavy snow would almost always have a vis of less than 300m.

Heavy snow is defined as snow accumulating at a rate of more than 4
cm/hr. That doesn't often happen here.


When I started observing at Wyton, the guidelines I was given was 1500m
or below for moderate snow and 200m for heavy.

I had 100m in moderate snow this morning, but I suspect there may have been very low stratus about - not that I could make out any detail of the sky!

--
Freddie
Fishpool Farm
Hyssington
Powys
296m AMSL
http://www.fishpoolfarmweather.co.uk/
https://twitter.com/FishpoolFarmWx for hourly reports

Norman Lynagh wrote:

Graham P Davis wrote:

High Wycombe has been reporting this nonsense for hours. Sigh!


My AWS has lots of rainfall 'saved up' in the funnel in the form of
snow. When the temperature finally rises it'll no doubt indicate a day
of mod/hvy rain, even though there may be no rainfall at all. Never
take anything at face value!


This happened to me last night. VP2 funnel blocked by ice was melted by
light rain and caused a brief spike to 85mm/hr.


--
Brian Wakem
Lower Bourne, Farnham, Surrey
http://www.brianwakem.co.uk/weather
Live obs @ 18:47:12 : 1.1C, DP 0.4C, RH 95%, 12.0 mm

On 10/12/17 11:07, Graham P Davis wrote:
High Wycombe has been reporting this nonsense for hours. Sigh!


And at 1000 this morning, they're back to 'heavy' snow with vis of
2800m! Tut tut.

--
Graham P Davis, Bracknell, Berks. Web-site: http://www.scarlet-jade.com/
"Nobody can get the truth out of me because even I don't know what it
is. I keep myself in a constant state of utter confusion." [Col. Flagg]
OS: Linux [openSUSE Tumbleweed]