1040 hPa anticyclone ?
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1040 hPa anticyclone ?
Bugger
I was hoping for a 1040hPa anticyclone, even though short lived, to develop over NZ this coming week but it looks as though the ECAL looks like to kick in again, with a shallow low, ruining our chances
Might get to 1039 hPa, somewhere, if we're lucky
There is nothing like an 1040hPa centred anticyclone
JohnGaul
NZ Anticyclone Appreciation Society
I was hoping for a 1040hPa anticyclone, even though short lived, to develop over NZ this coming week but it looks as though the ECAL looks like to kick in again, with a shallow low, ruining our chances
Might get to 1039 hPa, somewhere, if we're lucky
There is nothing like an 1040hPa centred anticyclone
JohnGaul
NZ Anticyclone Appreciation Society
JohnGaul
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Re: 1040 hPa anticyclone ?
Looks like that centre may be around the Gisborne area according to MetServive's future map.NZ Thunderstorm Soc wrote:
Might get to 1039 hPa, somewhere, if we're lucky
JohnGaul
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Re: 1040 hPa anticyclone ?
Yep. ...and it looks as though it will be off the coast of CanterburyKarshvardidgâh wrote:I see metservice has it going as high as 1041
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Re: 1040 hPa anticyclone ?
Just reporting in,been quite busy today.So sorry to hear of your loss John,my condolences to you and your family.Fairly clear here just a small amount of cloud over the banks and as such temp is now at 1.0c and falling, very light wind from South West 5.0kph and baro reading 1023mb and rising.Looking fairly interesting towards the end of the week,just hope its not going to be murky gray drizzle days again though.
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Re: 1040 hPa anticyclone ?
Met service is going 1042 now on latest future maps,smack bang over Canterbury. Bit of cloud coming up from south and off the coast.
Last edited by Lawrence on Tue 14/08/2007 08:34, edited 1 time in total.
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Re: 1040 hPa anticyclone ?
Has reached 1034.7 and still rising. This is an all time record for my station.
We had a frost here this morning but cloud and showers have come up from the south. We even had a couple of snow showers earlier.
We had a frost here this morning but cloud and showers have come up from the south. We even had a couple of snow showers earlier.
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Re: 1040 hPa anticyclone ?
Just making out some moderate to heavy showers making there way up the East coast on the M/S radar heading inland as they have been all morning,will be interesting to see if they make it or will the high pressure finally kill them off,seems like they are lessening.
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Re: 1040 hPa anticyclone ?
Still going up, trying to hit the 1040hPa mark here but my barometer is not all that correct
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Re: 1040 hPa anticyclone ?
If you are 50m above sea level, then your correction to station level pressure is only about 1mb, not 5mb!Karshvardidgâh wrote:1037mb here John at sea level reading,and 1032mb respectively and 0.6c.
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Re: 1040 hPa anticyclone ?
Sorry Tony, But thats not the information I have been using,Information could be wrong though,any one like to clear this upTonyT wrote: If you are 50m above sea level, then your correction to station level pressure is only about 1mb, not 5mb!
Cheers
Hydrostatic Equation, that relates changes in pressure to changes in height. This equation is as follows
^p=-rho*g*^z
where ^p is the change in pressure and ^z is the corresponding change in height in m. Rho, as above, is air density and g is gravity held constant at 9.8 m/s2. If we want to make a quick calculation of what vertical distance in meters that corresponds to a change in pressure of 1 millibar (0.1 cb) near sea level where the density is 1.2*10-3 t/m3, we get the following result:
0.1 cb= - 1.2*10-3 t/m3 * 9.8 m/s2 * ^z
Solving for ^z, we get 8.5m. In other words, a change in height of 8.5 meters near sea level, as you go up in the atmosphere, results in a reduction (thus the minus sign in equation above) in pressure of 1 millibar. If your location is 34 meters (111 feet) above sea level you will have to add 4 millibars to your barometric pressure reading to get an estimate of the sea level value.
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Re: 1040 hPa anticyclone ?
Head asplodes...Karshvardidgâh wrote:...Hydrostatic Equation, that relates changes in pressure to changes in height. This equation is as follows
^p=-rho*g*^z
where ^p is the change in pressure and ^z is the corresponding change in height in m. Rho, as above, is air density and g is gravity held constant at 9.8 m/s2. If we want to make a quick calculation of what vertical distance in meters that corresponds to a change in pressure of 1 millibar (0.1 cb) near sea level where the density is 1.2*10-3 t/m3, we get the following result:
0.1 cb= - 1.2*10-3 t/m3 * 9.8 m/s2 * ^z
Solving for ^z, we get 8.5m. In other words, a change in height of 8.5 meters near sea level, as you go up in the atmosphere, results in a reduction (thus the minus sign in equation above) in pressure of 1 millibar. If your location is 34 meters (111 feet) above sea level you will have to add 4 millibars to your barometric pressure reading to get an estimate of the sea level value.
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Re: 1040 hPa anticyclone ?
Reached 1036mb / hPa here now - slowly catching up to you guys down south - unusual event and shape of the Anticyclone...
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Re: 1040 hPa anticyclone ?
I tried an online calculator which said that SLP of 1015mb gives a correction of about 6MB for 50m ASL.
Sounds rather high to me! Over to someone else!
Sounds rather high to me! Over to someone else!
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Re: 1040 hPa anticyclone ?
yes, approaching my previous record high baro of 10.37.4 on the 8th sep 2004
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Re: 1040 hPa anticyclone ?
Sorry, you are correct. I misread 50 metres for 50 feet Is Rolleston really 50m above msl?
As a rule of thumb, allow 1mb for 10m of altitude.
As a rule of thumb, allow 1mb for 10m of altitude.
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Re: 1040 hPa anticyclone ?
it gets complicated if you live in Colorado, being in the middle of the continent and at 6000 feet above sea level and with intense artic high pressure and very cold temperatures, they have to use field pressure (QFE), which is temperature compensated pressure...in those cicumstances a simple offset to sea level for the altitude does not work accurately
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Re: 1040 hPa anticyclone ?
Exactly Rupert - I have it done as a polynomial calculation and the answer is 6.06hPa or mbRWood wrote:I tried an online calculator which said that SLP of 1015mb gives a correction of about 6MB for 50m ASL.
Sounds rather high to me! Over to someone else!
HTH...
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Re: 1040 hPa anticyclone ?
Hi Tony,TonyT wrote: Is Rolleston really 50m above msl?
Yes,some parts of Rolleston are, it depends which part of the town you live in.For instance Amberley town center is 44m ASL,but just to the north it rises to 100m ASL.You can aquire this information fromhttp://www.nztopoonline.linz.govt.nz/we ... viewer.htmZoom in and look for the relative figure nearest your base.
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Re: 1040 hPa anticyclone ?
peaked here at 1036.7 (which is a station record for my 1.5 year duration)
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Re: 1040 hPa anticyclone ?
[quote="Karshvardidgâh
Hi Tony,
Yes,some parts of Rolleston are, it depends which part of the town you live in.For instance Amberley town center is 44m ASL,but just to the north it rises to 100m ASL.You can aquire this information fromhttp://www.nztopoonline.linz.govt.nz/we ... viewer.htmZoom in and look for the relative figure nearest your base. [/quote]
Is that free or not? Miles of legalistic junk...
Hi Tony,
Yes,some parts of Rolleston are, it depends which part of the town you live in.For instance Amberley town center is 44m ASL,but just to the north it rises to 100m ASL.You can aquire this information fromhttp://www.nztopoonline.linz.govt.nz/we ... viewer.htmZoom in and look for the relative figure nearest your base. [/quote]
Is that free or not? Miles of legalistic junk...
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Re: 1040 hPa anticyclone ?
It's free. And brilliant. It makes my job a little easier too.RWood wrote:Is that free or not? Miles of legalistic junk...
Last edited by Gary Roberts on Wed 15/08/2007 12:58, edited 1 time in total.