The Weather Forecasting Forum

Plotting pressure in Hpa
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Author:  edwoodza [ Sat Jul 26, 2008 12:38 pm ]
Post subject:  Plotting pressure in Hpa

Anyone able to help a newbie on how to plot the pressure in hectopascals and not inch?
seems people this side cant understand anything other then hectopascals...simpletons

Author:  Peter [ Sun Jul 27, 2008 9:38 am ]
Post subject: 

I use DAWS and also have DA Equinox and both plot pressure in mb as standard.
1mb = 1 HPa and mb (HPa) is the standard international reporting unit.
I think only in North America are inches of Hg used as the rest of the world use HPa and deg C.

Scripting: H500 will give you temp etc at 500mb. Also SLP is Sea Level Pressure in mb.
DegC or degf temperature in whatever unit are specified ie. C or F


Author:  edwoodza [ Sun Jul 27, 2008 3:29 pm ]
Post subject: 

Hi there, thanks for the fast response.

RE pressure:
When i generate it i get the QNG (hpa) at the H or Low pressure then the lines radiating out give it to me in mb. ie 23, 21, 19 etc i would prefer them to read 1021, 1022, 1023 etc etc
I need all the lines scale to be in hpa.

1mb=100hpa, so somehow i need to be able to get it to show the correct values.

Author:  Peter [ Mon Jul 28, 2008 12:57 am ]
Post subject: 

1mb = 1hpa they are the same unit but different names.

The display you are seeing is the normal display and I do not know any way of changing it. Maybe someone else does but my DAWS and DA Equinox display as 21,22, and not as 1021, 1022mb.


Author:  edwoodza [ Mon Jul 28, 2008 9:26 am ]
Post subject: 

if anyone knows how it will be great as people down here are a little slow to anything they have not seen before

Author:  edwoodza [ Wed Jul 30, 2008 12:19 pm ]
Post subject: 

FINALLY think i found the solution
gives the pressure in 4 digits and not 2

(well it worked just now and now seems to be messing with me)

Author:  Grant shulman [ Sat Mar 28, 2009 10:30 am ]
Post subject: 

when hpa goes higher eg. 700-1005 does it means that the weather gets better or worse?

Author:  Greg Higgins [ Sat Mar 28, 2009 8:13 pm ]
Post subject: 

HPA has nothing to do with weather getting better of worse per se. It is a unit of measurement that is used in describing pressure. HPA and mb are the same, just different names. 500mb = pressure between 520 - 580mb / hpa.

Author:  Grant shulman [ Sun Mar 29, 2009 6:35 am ]
Post subject: 

Ah oky Thanks,because i bought this watch that gives you hpa pressure so i just want to know what do i use it for?

Author:  Greg Higgins [ Sun Mar 29, 2009 1:14 pm ]
Post subject: 

You could correlate the pressure to height (distance above sea level) to know your elevation. Sounds like an aviators watch. Make sure you keep it calibrated.

Greg Higgins

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