16 July 2013
Wokingham 0900z 010 03kt 10km HZ 3Cs280 7Ci350
+22.1/+14.5 QFF 1023.5 0.0 in 3hr Total 7 okta
RMK COTRA Upper arc of contact to 22 deg halo.
Dry and fine since 15z yesterday, but with almost
complete cover of Ci/Cs for most of the time.

09-09 Screen max +29.1 min +14.2 grass min +11.2
Rain 0.0 Sun (00-24) 13.7 hr
AWS max +29.3 min +14.5


--
Bernard Burton

Wokingham Berkshire.

Weather data and satellite images at:
http://www.woksat.info/wwp.html

16 July 2013
Wokingham 0900z 010 03kt 10km HZ 3Cs280 7Ci350
+22.1/+14.5 QFF 1023.5 0.0 in 3hr Total 7 okta
RMK COTRA Upper arc of contact to 22 deg halo.
Dry and fine since 15z yesterday, but with almost
complete cover of Ci/Cs for most of the time.

09-09 Screen max +29.1 min +14.2 grass min +11.2
Rain 0.0 Sun (00-24) 13.7 hr
AWS max +29.3 min +14.5

Wokingham 1500z 220 04/10kt 40km 1Cu070 7Ci350
+28.8/+11.0 QFF 1021.7 -0.9 in 3hr total 7 okta
RMK 1Ci250 2Cs300 COTRA Cu hum Upper arc of contact
Fine and sunny since 09z.
Max temp so far +29.5 at 1432z

--
Bernard Burton

Wokingham Berkshire.

Weather data and satellite images at:
http://www.woksat.info/wwp.html

On Tuesday, 16 July 2013 16:17:15 UTC+1, Bernard Burton wrote:

16 July 2013 Wokingham 0900z 010 03kt 10km HZ 3Cs280 7Ci350 +22.1/+14.5 QFF 1023.5 0.0 in 3hr Total 7 okta RMK COTRA Upper arc of contact to 22 deg halo. Dry and fine since 15z yesterday, but with almost complete cover of Ci/Cs for most of the time. 09-09 Screen max +29.1 min +14.2 grass min +11.2 Rain 0.0 Sun (00-24) 13.7 hr AWS max +29.3 min +14.5 Wokingham 1500z 220 04/10kt 40km 1Cu070 7Ci350 +28.8/+11.0 QFF 1021.7 -0.9 in 3hr total 7 okta RMK 1Ci250 2Cs300 COTRA Cu hum Upper arc of contact Fine and sunny since 09z.. Max temp so far +29.5 at 1432z -- Bernard Burton Wokingham Berkshire. Weather data and satellite images at: http://www.woksat.info/wwp.html

The Cs is persistent, uniform and now remarkably thick, almost like As.. The sun is still strong enough to cast shadows but only just. There seems no obvious source of it. Any ideas?

Tudor Hughes, Warlingham, Surrey.

"Tudor Hughes" wrote in message
...
On Tuesday, 16 July 2013 16:17:15 UTC+1, Bernard Burton wrote:

16 July 2013 Wokingham 0900z 010 03kt 10km HZ 3Cs280 7Ci350 +22.1/+14.5
QFF 1023.5 0.0 in 3hr Total 7 okta RMK COTRA Upper arc of contact to 22
deg halo. Dry and fine since 15z yesterday, but with almost complete cover
of Ci/Cs for most of the time. 09-09 Screen max +29.1 min +14.2 grass min
+11.2 Rain 0.0 Sun (00-24) 13.7 hr AWS max +29.3 min +14.5 Wokingham 1500z
220 04/10kt 40km 1Cu070 7Ci350 +28.8/+11.0 QFF 1021.7 -0.9 in 3hr total 7
okta RMK 1Ci250 2Cs300 COTRA Cu hum Upper arc of contact Fine and sunny
since 09z. Max temp so far +29.5 at 1432z -- Bernard Burton Wokingham
Berkshire. Weather data and satellite images at:
http://www.woksat.info/wwp.html

The Cs is persistent, uniform and now remarkably thick, almost like As.
The sun is still strong enough to cast shadows but only just. There seems
no obvious source of it. Any ideas?

Tudor Hughes, Warlingham, Surrey.



Well Tudor, the evidence available is in the sat pics, and Trappes ascents.
From the sat pics it looks as if there may be a weak upper vortex working
its way north over France. On its north side the flow is very
anticyclonically curved, and there seems to also be fairly strong
acceleration downwind. This points to quite strong positive vorticity
advection, with its associated ascent. The Trappes sonde shows cooling and
moistening in the 400 to 200 mbar layer, attesting to the ascent. The nature
of the cloud on the sat images shows that on its southern edge it is quite
convective, and the Chilbolton radar also confirms this. Today convective
elements are between 7.5 and 8.5 km, and 10.0 to 11.5 km, and yesterday, on
the 15th, these merged for a time, probably what we see in the thicker areas
of CiCs. The flow downwind will continue to have weak ascent, maintaining
saturation and the presence of cloud, which I see on the current sat pics
has now extended over Poland. The cloud will only disperse when the flow at
cloud level starts to descend.

--
Bernard Burton

Wokingham Berkshire.

Weather data and satellite images at:
http://www.woksat.info/wwp.html

On Tuesday, 16 July 2013 19:27:14 UTC+1, Bernard Burton wrote:

"Tudor Hughes" wrote in message ... On Tuesday, 16 July 2013 16:17:15 UTC+1, Bernard Burton wrote: 16 July 2013 Wokingham 0900z 010 03kt 10km HZ 3Cs280 7Ci350 +22.1/+14.5 QFF 1023.5 0.0 in 3hr Total 7 okta RMK COTRA Upper arc of contact to 22 deg halo. Dry and fine since 15z yesterday, but with almost complete cover of Ci/Cs for most of the time. 09-09 Screen max +29.1 min +14.2 grass min +11.2 Rain 0.0 Sun (00-24) 13.7 hr AWS max +29.3 min +14.5 Wokingham 1500z 220 04/10kt 40km 1Cu070 7Ci350 +28.8/+11.0 QFF 1021.7 -0.9 in 3hr total 7 okta RMK 1Ci250 2Cs300 COTRA Cu hum Upper arc of contact Fine and sunny since 09z. Max temp so far +29.5 at 1432z -- Bernard Burton Wokingham Berkshire. Weather data and satellite images at: http://www.woksat.info/wwp.html The Cs is persistent, uniform and now remarkably thick, almost like As. The sun is still strong enough to cast shadows but only just. There seems no obvious source of it. Any ideas? Tudor Hughes, Warlingham, Surrey. Well Tudor, the evidence available is in the sat pics, and Trappes ascents. From the sat pics it looks as if there may be a weak upper vortex working its way north over France. On its north side the flow is very anticyclonically curved, and there seems to also be fairly strong acceleration downwind. This points to quite strong positive vorticity advection, with its associated ascent. The Trappes sonde shows cooling and moistening in the 400 to 200 mbar layer, attesting to the ascent. The nature of the cloud on the sat images shows that on its southern edge it is quite convective, and the Chilbolton radar also confirms this. Today convective elements are between 7.5 and 8.5 km, and 10.0 to 11.5 km, and yesterday, on the 15th, these merged for a time, probably what we see in the thicker areas of CiCs. The flow downwind will continue to have weak ascent, maintaining saturation and the presence of cloud, which I see on the current sat pics has now extended over Poland. The cloud will only disperse when the flow at cloud level starts to descend. -- Bernard Burton Wokingham Berkshire. Weather data and satellite images at: http://www.woksat.info/wwp.html

Thanks, Bernard. Obviously I should have looked a bit harder. The moisture on the Trappes ascent is very marked as is the convective nature of the cloud on the satpics.

Tudor Hughes, Warlingham, Surrey.