Cumulus Support

Posted: **Thu 10 Dec 2009 6:42 pm**

Hi Steve cod you tell me at what level in hpa
wood each of these happen
Rising very rapidly
Rising quickly
Rising
Rising slowly
Steady
Falling slowly
Falling
Falling quickly
Falling very rapidly
Thanks

Posted: **Thu 10 Dec 2009 6:56 pm**

Here's the code; hopefully self-explanatory:

Code: Select all

  if HourlyPressureChangeMB > 6 then
    presstrendstr := Risingveryrapidly
  else if HourlyPressureChangeMB > 3.5 then
    presstrendstr := Risingquickly
  else if HourlyPressureChangeMB > 1.5 then
    presstrendstr := Rising
  else if HourlyPressureChangeMB > 0.1 then
    presstrendstr := Risingslowly
  else if HourlyPressureChangeMB > -0.1 then
    presstrendstr := Steady
  else if HourlyPressureChangeMB > -1.5 then
    presstrendstr := Fallingslowly
  else if HourlyPressureChangeMB > -3.5 then
    presstrendstr := Falling
  else if HourlyPressureChangeMB > -6 then
    presstrendstr := Fallingquickly
  else
    presstrendstr := Fallingveryrapidly;

Posted: **Fri 11 Dec 2009 11:00 am**

According to Davis Instruments (manual), for their Vantage Pro2 and Vantage Pro2 Plus consoles:

Barometric Trend (3 hour):

5 Arrow Positions:
- Rising Rapidly
- Rising Slowly
- Steady
- Falling Slowly
- Falling Rapidly

Change Rates:
- Rapidly: ≥.06” H; 1.5 mm Hg; 2 hPa; 2mb
- Slowly: ≥.02” H; 0.5 mm Hg; 0.7hPa; 0.7mb

Posted: **Fri 11 Dec 2009 2:19 pm**

steve wrote:Here's the code; hopefully self-explanatory:

That'll teach me to refactor code on the fly. Those figures apply to the three-hourly change in pressure (not the hourly change), and the cut-offs are those used by the UK Met Office. So the code actually looks like this (only the variable name has changed):

Code: Select all

  if ThreeHourlyPressureChangeMB > 6 then
    presstrendstr := Risingveryrapidly
  else if ThreeHourlyPressureChangeMB > 3.5 then
    presstrendstr := Risingquickly
  else if ThreeHourlyPressureChangeMB > 1.5 then
    presstrendstr := Rising
  else if ThreeHourlyPressureChangeMB > 0.1 then
    presstrendstr := Risingslowly
  else if ThreeHourlyPressureChangeMB > -0.1 then
    presstrendstr := Steady
  else if ThreeHourlyPressureChangeMB > -1.5 then
    presstrendstr := Fallingslowly
  else if ThreeHourlyPressureChangeMB > -3.5 then
    presstrendstr := Falling
  else if ThreeHourlyPressureChangeMB > -6 then
    presstrendstr := Fallingquickly
  else
    presstrendstr := Fallingveryrapidly;

Apologies for the confusion.

Posted: **Thu 10 Feb 2011 8:57 pm**

Hi Steve
if use cumulus pressure names is unchecked
so davis name are used what that code look like
beau

Posted: **Thu 10 Feb 2011 9:09 pm**

n9mfk wrote:Hi Steve
if use cumulus pressure names is unchecked
so davis name are used what that code look like

I don't know for certain; Cumulus just reads the string from the Davis code. But I assume it's the same as Ray has posted above.

Cumulus Support

presure trend ?

presure trend ?

Re: presure trend ?

Re: presure trend ?

Re: presure trend ?

Re: presure trend ?

Re: presure trend ?