.... started ~0740Z ... steady slight ... main effect to dampen roads
.... slight / patchy covering tarmac paths ... visibility reduced due
to general haze/mist ~ 4 km: OAT = +0.7°C.

Martin.


--
Martin Rowley
West Moors, East Dorset (UK): 17m (56ft) amsl
Lat: 50.82N Long: 01.88W
NGR: SU 082 023

On 30/11/10 08:02, Martin Rowley wrote:
... started ~0740Z ... steady slight ... main effect to dampen roads
... slight / patchy covering tarmac paths ... visibility reduced due
to general haze/mist ~ 4 km: OAT = +0.7°C.

A few tiny snow grains in the air in Evershot, melting on the tarmac.
Certainly not dampening the roads. OAT -0.8C @ 0815.

Hugh

--

Hugh Newbury

www.evershot-weather.org

"Martin Rowley" wrote ...
(0800Z report) ... started ~0740Z ... steady slight ... main effect
to dampen roads ... slight / patchy covering tarmac paths ...
visibility reduced due to general haze/mist ~ 4 km: OAT = +0.7°C.


.... (0900Z): off and on very light snow much of past hour, but
recently turned to sleet as temperature has come up a little: current
OAT =+1.1°C/DP= -0.6°C, so the wet bulb is highly marginal. Visibility
now up to 8 km; OVC AS (that has thickened), with Sc/St fra
underneath. Most of what little snow there was has melted now. No
impact on roads/paving.

Martin.


--
Martin Rowley
West Moors, East Dorset (UK): 17m (56ft) amsl
Lat: 50.82N Long: 01.88W
NGR: SU 082 023

"Martin Rowley" wrote ...
(0800Z report) ... started ~0740Z ... steady slight ... main effect
to dampen roads ... slight / patchy covering tarmac paths ...
visibility reduced due to general haze/mist ~ 4 km: OAT = +0.7°C.
... (0900Z): off and on very light snow much of past hour, but
recently turned to sleet as temperature has come up a little:
current OAT =+1.1°C/DP= -0.6°C, so the wet bulb is highly marginal.
Visibility now up to 8 km; OVC AS (that has thickened), with Sc/St
fra underneath. Most of what little snow there was has melted now.
No impact on roads/paving.


.... (1000Z): PPN past hour has been rain/snow mixed (very light) or
drizzle as temperature has slowly risen ... currently OAT = +1.3°C.
All earlier fragmentary lying snow has melted - all surfaces damp.
Current -RASN. It'll need advection of colder air, or sustained
heavier PPN to give us anything dramatic I suspect.

Martin.


--
Martin Rowley
West Moors, East Dorset (UK): 17m (56ft) amsl
Lat: 50.82N Long: 01.88W
NGR: SU 082 023

... (1000Z): PPN past hour has been rain/snow mixed (very light) or
drizzle as temperature has slowly risen ... currently OAT = +1.3°C.
All earlier fragmentary lying snow has melted - all surfaces damp.
Current -RASN. It'll need advection of colder air, or sustained
heavier PPN to give us anything dramatic I suspect.

.... (1130Z): PPN ceased not long after above report - cloud character
becoming more convective - shallow Cu, underneath thick Ci and
residual Ac. OAT now up to 2.1°C.

Martin.

--
Martin Rowley
West Moors, East Dorset (UK): 17m (56ft) amsl
Lat: 50.82N Long: 01.88W
NGR: SU 082 023

... (1000Z): PPN past hour has been rain/snow mixed (very light) or
drizzle as temperature has slowly risen ... currently OAT = +1.3°C.
All earlier fragmentary lying snow has melted - all surfaces damp.
Current -RASN. It'll need advection of colder air, or sustained
heavier PPN to give us anything dramatic I suspect.
... (1130Z): PPN ceased not long after above report - cloud
character becoming more convective - shallow Cu, underneath thick Ci
and residual Ac. OAT now up to 2.1°C.


.... (1300Z): deepening Cu produced shower rain/snow mixed & snow
pellets from 1225Z, then the cloud transformed to layer type (though
no doubt Cu there / can't see it), and we've got light snow flakes
now - no impact surface/minimal impact visibility. OAT =
+2.0°C/DP=-0.4°C

Martin.


--
Martin Rowley
West Moors, East Dorset (UK): 17m (56ft) amsl
Lat: 50.82N Long: 01.88W
NGR: SU 082 023

[ correction for subject ]
... (1000Z): PPN past hour has been rain/snow mixed (very light)
or drizzle as temperature has slowly risen ... currently OAT =
+1.3°C. All earlier fragmentary lying snow has melted - all
surfaces damp. Current -RASN. It'll need advection of colder air,
or sustained heavier PPN to give us anything dramatic I suspect.
... (1130Z): PPN ceased not long after above report - cloud
character becoming more convective - shallow Cu, underneath thick
Ci and residual Ac. OAT now up to 2.1°C.


... (1300Z): deepening Cu produced shower rain/snow mixed & snow
pellets from 1225Z, then the cloud transformed to layer type (though
no doubt Cu there / can't see it), and we've got light snow flakes
now - no impact surface/minimal impact visibility. OAT =
+2.0°C/DP=-0.4°C
Martin.




--
Martin Rowley
West Moors, East Dorset (UK): 17m (56ft) amsl
Lat: 50.82N Long: 01.88W
NGR: SU 082 023

... (1300Z): deepening Cu produced shower rain/snow mixed & snow
pellets from 1225Z, then the cloud transformed to layer type (though
no doubt Cu there / can't see it), and we've got light snow flakes
now - no impact surface/minimal impact visibility. OAT =
+2.0°C/DP=-0.4°C


.... (1355Z): after another 10-15 minutes of 'proper' flake aggregates,
snow ceased. Surfaces damp - cloud breaking - weak sunshine
occasionally through thin upper cloud. OAT=+1.9°C.

Martin.


--
Martin Rowley
West Moors, East Dorset (UK): 17m (56ft) amsl
Lat: 50.82N Long: 01.88W
NGR: SU 082 023

... (1300Z): deepening Cu produced shower rain/snow mixed & snow
pellets from 1225Z, then the cloud transformed to layer type
(though
no doubt Cu there / can't see it), and we've got light snow flakes
now - no impact surface/minimal impact visibility. OAT =
+2.0°C/DP=-0.4°C
... (1355Z): after another 10-15 minutes of 'proper' flake
aggregates, snow ceased. Surfaces damp - cloud breaking - weak
sunshine occasionally through thin upper cloud. OAT=+1.9°C.


.... (1550Z): individual flakes of snow from shallow-depth Cu passing
across, thin Ac above and extensive CiCs above that. OAT currently
+1.4°C/DP-0.8°C. No snow on any surfaces, which latter are damp. The
wind just a shade 'keener' now.

Martin.


--
Martin Rowley
West Moors, East Dorset (UK): 17m (56ft) amsl
Lat: 50.82N Long: 01.88W
NGR: SU 082 023

"Martin Rowley" wrote in message
news
... (1300Z): deepening Cu produced shower rain/snow mixed & snow
pellets from 1225Z, then the cloud transformed to layer type (though
no doubt Cu there / can't see it), and we've got light snow flakes
now - no impact surface/minimal impact visibility. OAT =
+2.0°C/DP=-0.4°C
... (1355Z): after another 10-15 minutes of 'proper' flake aggregates,
snow ceased. Surfaces damp - cloud breaking - weak sunshine occasionally
through thin upper cloud. OAT=+1.9°C.


... (1550Z): individual flakes of snow from shallow-depth Cu passing
across, thin Ac above and extensive CiCs above that. OAT currently
+1.4°C/DP-0.8°C. No snow on any surfaces, which latter are damp. The wind
just a shade 'keener' now.

Martin.

It's always so marginal with you Martin. Thanks for the reports, been useful
to know ground truth upwind.

Will
--