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Weather Banter » Weather Related Newsgroups » uk.sci.weather (UK Weather) > Bizarre dewpoint change...
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Old March 15th 14, 04:17 PM posted to uk.sci.weather
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Default Bizarre dewpoint change...
Here's something from my VP earlier this afternoon :

Date/Time Temp Rel.Hum Dewpoint
15/03/2014 14:10 14.8 65 8.3
15/03/2014 14:11 14.8 63 7.8
15/03/2014 14:12 14.8 63 7.8
15/03/2014 14:13 14.8 56 6.1
15/03/2014 14:14 14.8 53 5.3
15/03/2014 14:15 14.8 52 5.0
15/03/2014 14:16 14.8 51 4.8
15/03/2014 14:17 14.8 51 4.8
15/03/2014 14:18 14.9 50 4.5
15/03/2014 14:19 14.9 50 4.6
15/03/2014 14:20 15.0 49 4.4
15/03/2014 14:21 15.1 48 4.1
15/03/2014 14:22 15.1 47 3.9
15/03/2014 14:23 15.2 46 3.6
15/03/2014 14:24 15.2 46 3.7
15/03/2014 14:25 15.2 45 3.4
15/03/2014 14:26 15.3 45 3.4
15/03/2014 14:27 15.3 45 3.5
15/03/2014 14:28 15.4 45 3.5
15/03/2014 14:29 15.4 46 3.9
15/03/2014 14:30 15.4 47 4.2
15/03/2014 14:31 15.5 49 4.8
15/03/2014 14:32 15.5 52 5.7
15/03/2014 14:33 15.6 57 7.1
15/03/2014 14:34 15.6 57 7.1
15/03/2014 14:35 15.6 58 7.4

And not a weather front in sight - what could have caused such a rapid
drop & rise in dewpoint?

--

Paul Hyett, Cheltenham
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Old March 15th 14, 04:34 PM posted to uk.sci.weather
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Default Bizarre dewpoint change...
Nothing here but my VP2 is only set for 15 minute datasets.

Date Time Temp Hum DP
15/03/2014 12:30 16.3 67 10.1
15/03/2014 12:45 16.6 65 9.9
15/03/2014 13:00 16.9 65 10.3
15/03/2014 13:15 17.2 61 9.6
15/03/2014 13:30 17.4 60 9.6
15/03/2014 13:45 17.6 60 9.6
15/03/2014 14:00 17.7 61 10.0
15/03/2014 14:15 17.9 55 8.8
15/03/2014 14:30 18.0 54 8.3
15/03/2014 14:45 17.8 57 8.9
15/03/2014 15:00 17.5 57 8.4
15/03/2014 15:15 17.0 60 8.7
15/03/2014 15:30 16.5 60 8.3
15/03/2014 15:45 16.1 61 8.3
15/03/2014 16:00 15.7 61 7.8

--
Nick G
Otter Valley, Devon
20 m amsl
http://www.ottervalley.co.uk
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Old March 15th 14, 05:16 PM posted to uk.sci.weather
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Default Bizarre dewpoint change...
Vidcapper wrote:

Here's something from my VP earlier this afternoon :

Date/Time Temp Rel.Hum Dewpoint
snip data

And not a weather front in sight - what could have caused such a rapid
drop & rise in dewpoint?



I have per-minute data from my vp2 - my dew point has been up and down like
a yoyo all day: http://www.brianwakem.co.uk/misc/dp.jpeg



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Brian Wakem
Lower Bourne, Farnham, Surrey
http://www.brianwakem.co.uk/weather/latest_obs.txt
http://www.brianwakem.co.uk/weather/...am%20Vale.html


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Old March 15th 14, 10:39 PM posted to uk.sci.weather
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Default Bizarre dewpoint change...
On 15/03/2014 16:17, Vidcapper wrote:
Here's something from my VP earlier this afternoon :

Date/Time Temp Rel.Hum Dewpoint
15/03/2014 14:10 14.8 65 8.3
15/03/2014 14:11 14.8 63 7.8
15/03/2014 14:12 14.8 63 7.8
15/03/2014 14:13 14.8 56 6.1
15/03/2014 14:14 14.8 53 5.3
15/03/2014 14:15 14.8 52 5.0
15/03/2014 14:16 14.8 51 4.8
15/03/2014 14:17 14.8 51 4.8
15/03/2014 14:18 14.9 50 4.5
15/03/2014 14:19 14.9 50 4.6
15/03/2014 14:20 15.0 49 4.4
15/03/2014 14:21 15.1 48 4.1
15/03/2014 14:22 15.1 47 3.9
15/03/2014 14:23 15.2 46 3.6
15/03/2014 14:24 15.2 46 3.7
15/03/2014 14:25 15.2 45 3.4
15/03/2014 14:26 15.3 45 3.4
15/03/2014 14:27 15.3 45 3.5
15/03/2014 14:28 15.4 45 3.5
15/03/2014 14:29 15.4 46 3.9
15/03/2014 14:30 15.4 47 4.2
15/03/2014 14:31 15.5 49 4.8
15/03/2014 14:32 15.5 52 5.7
15/03/2014 14:33 15.6 57 7.1
15/03/2014 14:34 15.6 57 7.1
15/03/2014 14:35 15.6 58 7.4

And not a weather front in sight - what could have caused such a rapid
drop & rise in dewpoint?

Might be something to do with the wind, what were the speeds and directions?
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Old March 16th 14, 07:15 AM posted to uk.sci.weather
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Default Bizarre dewpoint change...
On 15/03/2014 22:39, Metman2012 wrote:
On 15/03/2014 16:17, Vidcapper wrote:
Here's something from my VP earlier this afternoon :

Date/Time Temp Rel.Hum Dewpoint
15/03/2014 14:10 14.8 65 8.3
15/03/2014 14:11 14.8 63 7.8
15/03/2014 14:12 14.8 63 7.8
15/03/2014 14:13 14.8 56 6.1
15/03/2014 14:14 14.8 53 5.3
15/03/2014 14:15 14.8 52 5.0
15/03/2014 14:16 14.8 51 4.8
15/03/2014 14:17 14.8 51 4.8
15/03/2014 14:18 14.9 50 4.5
15/03/2014 14:19 14.9 50 4.6
15/03/2014 14:20 15.0 49 4.4
15/03/2014 14:21 15.1 48 4.1
15/03/2014 14:22 15.1 47 3.9
15/03/2014 14:23 15.2 46 3.6
15/03/2014 14:24 15.2 46 3.7
15/03/2014 14:25 15.2 45 3.4
15/03/2014 14:26 15.3 45 3.4
15/03/2014 14:27 15.3 45 3.5
15/03/2014 14:28 15.4 45 3.5
15/03/2014 14:29 15.4 46 3.9
15/03/2014 14:30 15.4 47 4.2
15/03/2014 14:31 15.5 49 4.8
15/03/2014 14:32 15.5 52 5.7
15/03/2014 14:33 15.6 57 7.1
15/03/2014 14:34 15.6 57 7.1
15/03/2014 14:35 15.6 58 7.4

And not a weather front in sight - what could have caused such a rapid
drop & rise in dewpoint?

Might be something to do with the wind, what were the speeds and
directions?

Almost non-existent & variable.

--

Paul Hyett, Cheltenham
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Old March 16th 14, 09:45 AM posted to uk.sci.weather
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Default Bizarre dewpoint change...
On 15/03/14 16:17, Vidcapper wrote:
what could have caused such a rapid drop & rise in dewpoint?

I reckon it is just a bit of variation in the humidity of the airmass.

--
Freddie
Castle Pulverbatch
Shropshire
221m AMSL
http://www.hosiene.co.uk/weather/
http://twitter.com/PulverbatchWx for hourly reports
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Old March 16th 14, 10:46 AM posted to uk.sci.weather
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Default Bizarre dewpoint change...
On 16/03/2014 09:45, Freddie wrote:
On 15/03/14 16:17, Vidcapper wrote:
what could have caused such a rapid drop & rise in dewpoint?

I reckon it is just a bit of variation in the humidity of the airmass.


If so, I never realised there could be *that* much variability in a
supposedly stable airmass?

--

Paul Hyett, Cheltenham
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Old March 16th 14, 12:08 PM posted to uk.sci.weather
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Default Bizarre dewpoint change...
On Sun, 16 Mar 2014 10:46:00 +0000, Vidcapper
wrote:
If so, I never realised there could be *that* much variability in a
supposedly stable airmass?

It's quite common - I've seen similar each of the 7 years I've had my
VP.

--
Freddie
Castle Pulverbatch
Shropshire
221m AMSL
http://www.hosiene.co.uk/weather/
http://twitter.com/PulverbatchWx for hourly reports
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Old March 16th 14, 12:27 PM posted to uk.sci.weather
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Default Bizarre dewpoint change...

"Vidcapper" wrote in message
...
On 16/03/2014 09:45, Freddie wrote:
On 15/03/14 16:17, Vidcapper wrote:
what could have caused such a rapid drop & rise in dewpoint?

I reckon it is just a bit of variation in the humidity of the airmass.


If so, I never realised there could be *that* much variability in a
supposedly stable airmass?

If the temperature fell when the humidity rose then the air density could
remain unchanged and no convection would result.

Cheers, Alastair.



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Old March 16th 14, 06:27 PM posted to uk.sci.weather
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Default Bizarre dewpoint change...
Vidcapper wrote:

Here's something from my VP earlier this afternoon :

Date/Time Temp Rel.Hum Dewpoint
15/03/2014 14:10 14.8 65 8.3
15/03/2014 14:11 14.8 63 7.8
15/03/2014 14:12 14.8 63 7.8
15/03/2014 14:13 14.8 56 6.1
15/03/2014 14:14 14.8 53 5.3
15/03/2014 14:15 14.8 52 5.0
15/03/2014 14:16 14.8 51 4.8
15/03/2014 14:17 14.8 51 4.8
15/03/2014 14:18 14.9 50 4.5
15/03/2014 14:19 14.9 50 4.6
15/03/2014 14:20 15.0 49 4.4
15/03/2014 14:21 15.1 48 4.1
15/03/2014 14:22 15.1 47 3.9
15/03/2014 14:23 15.2 46 3.6
15/03/2014 14:24 15.2 46 3.7
15/03/2014 14:25 15.2 45 3.4
15/03/2014 14:26 15.3 45 3.4
15/03/2014 14:27 15.3 45 3.5
15/03/2014 14:28 15.4 45 3.5
15/03/2014 14:29 15.4 46 3.9
15/03/2014 14:30 15.4 47 4.2
15/03/2014 14:31 15.5 49 4.8
15/03/2014 14:32 15.5 52 5.7
15/03/2014 14:33 15.6 57 7.1
15/03/2014 14:34 15.6 57 7.1
15/03/2014 14:35 15.6 58 7.4

And not a weather front in sight - what could have caused such a rapid
drop & rise in dewpoint?

Would I be correct in thinking that dewpoint is not measured, but calculated
from temperature and humidity?



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