Then 2 such events in one month?
If jetstream immediately to the south of a low that deepens by =24mb in
24 hours sufficiently defined such an event.
Local weather station to me, Southampton Docks
www.sotonmet.co.uk/
archives bit on there for 27/28 March shows a minimum of 967.0mB ,
dropped 26.8mB in 24 hours (may be GMT/BST confusion )

N_Cook wrote:

Then 2 such events in one month?
If jetstream immediately to the south of a low that deepens by =24mb in
24 hours sufficiently defined such an event.
Local weather station to me, Southampton Docks
www.sotonmet.co.uk/
archives bit on there for 27/28 March shows a minimum of 967.0mB ,
dropped 26.8mB in 24 hours (may be GMT/BST confusion )


At my station the pressure dropped 24mb in 9hrs 28mins.

2016-03-27 19:38:00 998.1mb
2016-03-28 05:06:00 974.1mb



--
Brian Wakem
Lower Bourne, Farnham, Surrey
http://www.brianwakem.co.uk/weather

Brian Wakem wrote:

N_Cook wrote:

Then 2 such events in one month?
If jetstream immediately to the south of a low that deepens by =24mb in
24 hours sufficiently defined such an event.
Local weather station to me, Southampton Docks
www.sotonmet.co.uk/
archives bit on there for 27/28 March shows a minimum of 967.0mB ,
dropped 26.8mB in 24 hours (may be GMT/BST confusion )


At my station the pressure dropped 24mb in 9hrs 28mins.

2016-03-27 19:38:00 998.1mb
2016-03-28 05:06:00 974.1mb


A drop of 24mb in 24hrs has happened 15 times at my station since I
started per-minute logging in August 2013.

9hrs 28mins is the fastest.


27/03/2016 19:38 - 28/03/2016 05:06 : 998.1 974.1 : 09:28
08/03/2016 20:01 - 09/03/2016 05:45 : 1008.9 984.9 : 09:44
26/01/2014 04:08 - 26/01/2014 13:57 : 1015.5 991.5 : 09:49
26/12/2014 12:10 - 26/12/2014 21:59 : 1027.2 1003.2 : 09:49
23/12/2013 03:29 - 23/12/2013 16:38 : 1011.5 987.5 : 13:09
25/01/2014 23:57 - 26/01/2014 13:33 : 1016.1 992.1 : 13:36
22/12/2013 23:58 - 23/12/2013 15:21 : 1013.5 989.5 : 15:23
27/01/2015 18:51 - 28/01/2015 11:58 : 1024.7 1000.7 : 17:07
28/01/2015 22:25 - 29/01/2015 15:39 : 1001.2 977.2 : 17:14
27/10/2013 09:37 - 28/10/2013 04:04 : 1005.9 981.9 : 18:27
14/02/2014 03:30 - 14/02/2014 21:58 : 999.4 975.4 : 18:28
25/12/2014 23:59 - 26/12/2014 19:37 : 1032.6 1008.6 : 19:38
01/01/2016 08:51 - 02/01/2016 05:02 : 1021.1 997.1 : 20:11
13/02/2014 23:52 - 14/02/2014 20:33 : 1000.4 976.4 : 20:41
05/02/2016 22:10 - 06/02/2016 21:16 : 1009.7 985.7 : 23:06


But I supposed the definition of explosive cyclogenisis is where the central
pressure drops 24mb in 24hrs rather than at a specific point where the low
is moving over.



--
Brian Wakem
Lower Bourne, Farnham, Surrey
http://www.brianwakem.co.uk/weather

On Wednesday, 30 March 2016 15:24:19 UTC+1, Brian Wakem wrote:
Brian Wakem wrote:



But I supposed the definition of explosive cyclogenisis is where the central
pressure drops 24mb in 24hrs rather than at a specific point where the low
is moving over.



--
Good point. Katie was nothing like a bomb even though vigorous. I think the term is a bit naff anyway because bombs explode outwards whereas these lows implode, the very opposite.

Tudor Hughes, Warlingham, Surrey.

On Wed, 30 Mar 2016 11:56:34 +0100, N_Cook wrote:

Then 2 such events in one month?
If jetstream immediately to the south of a low that deepens by =24mb in
24 hours sufficiently defined such an event.
Local weather station to me, Southampton Docks
www.sotonmet.co.uk/
archives bit on there for 27/28 March shows a minimum of 967.0mB ,
dropped 26.8mB in 24 hours (may be GMT/BST confusion )

What Brian and Tudor said, but I should mention that the Southampton
Docks site linked is currently reporting atmospheric pressure about 7
mb too low, and was on Monday too.

It's currently 1009 mb here, at Calshot and at Southampton and Hurn
airports too... so the 1002 mb reported by Southampton Docks is
clearly wrong.

--
Dave
Fareham (W)

On 30/03/2016 17:18, Dave Ludlow wrote:
On Wed, 30 Mar 2016 11:56:34 +0100, N_Cook wrote:

Then 2 such events in one month?
If jetstream immediately to the south of a low that deepens by =24mb in
24 hours sufficiently defined such an event.
Local weather station to me, Southampton Docks
www.sotonmet.co.uk/
archives bit on there for 27/28 March shows a minimum of 967.0mB ,
dropped 26.8mB in 24 hours (may be GMT/BST confusion )

What Brian and Tudor said, but I should mention that the Southampton
Docks site linked is currently reporting atmospheric pressure about 7
mb too low, and was on Monday too.

It's currently 1009 mb here, at Calshot and at Southampton and Hurn
airports too... so the 1002 mb reported by Southampton Docks is
clearly wrong.


Not surprising, ABP/Southampton Docks Board records are not included on
this site
http://www.surgewatch.org/sites/get/
embarrassing as sited at the NOC Southampton.
Somewhere on that site it explains why, or used to , not found just now.
"A particular issue with older events are consistency issues with the
vertical datum used at that time, in relation to modern datums. These are
reasons we chose to leave this type of addition to a subsequent stage. "
and
"These tide gauges are operated for example by port authorities (such as
at Southampton where a new digitised record has been extended back
to 1935). However, because they do not form part of the National
Network, such data can be of lower quality and require extensive and
time-consuming quality control measures. That is the main reason we did
not include this data at this stage."

On Wednesday, 30 March 2016 18:42:56 UTC+1, N_Cook wrote:
On 30/03/2016 17:18, Dave Ludlow wrote:
On Wed, 30 Mar 2016 11:56:34 +0100, N_Cook wrote:

Then 2 such events in one month?
If jetstream immediately to the south of a low that deepens by =24mb in
24 hours sufficiently defined such an event.
Local weather station to me, Southampton Docks
www.sotonmet.co.uk/
archives bit on there for 27/28 March shows a minimum of 967.0mB ,
dropped 26.8mB in 24 hours (may be GMT/BST confusion )

What Brian and Tudor said, but I should mention that the Southampton
Docks site linked is currently reporting atmospheric pressure about 7
mb too low, and was on Monday too.

It's currently 1009 mb here, at Calshot and at Southampton and Hurn
airports too... so the 1002 mb reported by Southampton Docks is
clearly wrong.


Not surprising, ABP/Southampton Docks Board records are not included on
this site
http://www.surgewatch.org/sites/get/
embarrassing as sited at the NOC Southampton.
Somewhere on that site it explains why, or used to , not found just now.
"A particular issue with older events are consistency issues with the
vertical datum used at that time, in relation to modern datums. These are
reasons we chose to leave this type of addition to a subsequent stage. "
and
"These tide gauges are operated for example by port authorities (such as
at Southampton where a new digitised record has been extended back
to 1935). However, because they do not form part of the National
Network, such data can be of lower quality and require extensive and
time-consuming quality control measures. That is the main reason we did
not include this data at this stage."

It is a chance to experience alternatives as the volcanic activity in the background peaks tom... later today. And then be followed with the sob of line-storms.
Should be fun.