I notice the current system in the North Sea must be whipping up the
waves. Gullfax is reporting hurricane-force sustained winds (76mph).

Gullfax Platform (10 m, Norway) 92 mph
Oseberg (15 m, Norway) 81 mph

As an aside, does the Beaufort scale refer to 1-min or 10-min sustained
winds? I'm assuming 1-minute sustained seeing as the hurricane force
category (73 or 74mph+ depending on where you read it) would then be in
keeping with the US definitions of when a tropical storm becomes a
hurricane.

Richard

Norman Lynagh wrote:


In the above case it would be appropriate to describe the wind as Force
8 with squalls to 45 knots and peak gusts above 50 knots.


Meanwhile, on this side of the North Sea, the wind is Force 6, with gusts to 7.

A bit of a breeze then.


--
Gianna

In message .com,
Richard Dixon writes
I notice the current system in the North Sea must be whipping up the
waves. Gullfax is reporting hurricane-force sustained winds (76mph).

Gullfax Platform (10 m, Norway) 92 mph
Oseberg (15 m, Norway) 81 mph

As an aside, does the Beaufort scale refer to 1-min or 10-min sustained
winds? I'm assuming 1-minute sustained seeing as the hurricane force
category (73 or 74mph+ depending on where you read it) would then be in
keeping with the US definitions of when a tropical storm becomes a
hurricane.

Richard

The Scale was originally based on the appearance of the sea rather than
on actual wind speeds. Because the seastate responds relatively slowly
to changes in wind speed the Beaufort forces at sea are generally
assumed to be 1-hour means. Therefore, in a Force 8, for example, there
may be spells of a few minutes with the mean speed as high as 45 knots
or more or as low as 30 knots or lower even though the 1-hour mean
remains within the 34-40 knot Force 8 range..

In the above case it would be appropriate to describe the wind as Force
8 with squalls to 45 knots and peak gusts above 50 knots.

Definitions on land are somewhat different. A gale is deemed to have
occurred on land if the mean speed is 34 knots or more for a period of
at least 10 minutes (at least I think that is the current UKMO
definition - others may know better)

Norman
(delete "thisbit" twice to e-mail)
--
Norman Lynagh Weather Consultancy
Chalfont St Giles 85m a.s.l.
England

Norman Lynagh wrote:

Definitions on land are somewhat different. A gale is deemed to have
occurred on land if the mean speed is 34 knots or more for a period of
at least 10 minutes (at least I think that is the current UKMO
definition - others may know better)

Interesting - I think this rings a bell with another thread in the
past. Certainly suggests that "hurricane force" winds measured over
land have different definitions in the UK and US: UK measuring by
10-min sustained and US measuring by 1-min sustained. I've seen a 1.12
factor for converting between the two that suggests a UK sustained wind
of 66mph (about 57kt) would probably be around hurricane force in US
"money".

Richard

In message .com,
Richard Dixon writes

Norman Lynagh wrote:

Definitions on land are somewhat different. A gale is deemed to have
occurred on land if the mean speed is 34 knots or more for a period of
at least 10 minutes (at least I think that is the current UKMO
definition - others may know better)

Interesting - I think this rings a bell with another thread in the
past. Certainly suggests that "hurricane force" winds measured over
land have different definitions in the UK and US: UK measuring by
10-min sustained and US measuring by 1-min sustained. I've seen a 1.12
factor for converting between the two that suggests a UK sustained wind
of 66mph (about 57kt) would probably be around hurricane force in US
"money".

Richard

Yes, the subject is bedevilled by confusion over the different
definitions used in different parts of the world and even different
definitions used by various bodies in the same country. There is no
"correct" system, which means that it is very important to make it clear
what definitions are being used on any particular occasion.

Norman
(delete "thisbit" twice to e-mail)
--
Norman Lynagh Weather Consultancy
Chalfont St Giles 85m a.s.l.
England

MCC wrote:

Don't know the actual wind speed in Shetland but a Bristow's Tiger
helicopter has been blown over at Scatsta airport.
http://news.bbc.co.uk/1/hi/scotland/...st/6102566.stm

Gusting to 101mph at Oseberg in Southern Norway. Slightly confusing as
relatively nearby, Oslo is only 40mph.

Anyone with local knowledge here?!

Richard

"Richard Dixon" wrote in message
ups.com


Gusting to 101mph at Oseberg in Southern Norway. Slightly confusing as
relatively nearby, Oslo is only 40mph.

Anyone with local knowledge here?!

Richard

No local knowledge but it like it's in the North Sea.
http://www.offshore-technology.com/p.../oseberg2.html

Jon.



--
Posted via Mailgate.ORG Server - http://www.Mailgate.ORG

"Jon O Rourke" wrote in message

No local knowledge but it like it's in the North Sea.
http://www.offshore-technology.com/p.../oseberg2.html

Jon.

or even "looks like" it's in the North Sea..







--
Posted via Mailgate.ORG Server - http://www.Mailgate.ORG

Looking at a map, Oseborg looks like it is on an exposed island just off the
mainlands North Sea coast, whereas Oslo is pretty sheltered on a fjord-like
inlet, with mountains to it's west. I spose given the right conditions Oslo
get some strong lee-wave winds from the west, or strong funnelled winds from
the south but not at the moment it seems.

Stu

"Richard Dixon" wrote in message
ups.com...

MCC wrote:

Don't know the actual wind speed in Shetland but a Bristow's Tiger
helicopter has been blown over at Scatsta airport.
http://news.bbc.co.uk/1/hi/scotland/...st/6102566.stm

Gusting to 101mph at Oseberg in Southern Norway. Slightly confusing as
relatively nearby, Oslo is only 40mph.

Anyone with local knowledge here?!

Richard

Jon O Rourke wrote:

"Jon O Rourke" wrote in message

No local knowledge but it like it's in the North Sea.
http://www.offshore-technology.com/p.../oseberg2.html

Jon.

or even "looks like" it's in the North Sea..


Or "like it's in the North Sea, man."

--
Graham Davis
Bracknell