<#presstrendval>?

[n9mfk]

Hi Steve,
is <#presstrendval> a 3 hr value or a 1 hr value?
thanks Beau

[steve]

It's the average rate of change over the previous three hours; in other words, the difference between the pressure now and the pressure three hours ago, divided by three. The web tag just gives this figure from the main screen:

Pomona - pomona_2011-10-06_17-20-40.png

[n9mfk]

Hi Steve,
wood -0.003 be Falling slowly?

[gemini06720]

Beau, what is the value (term) in either/both the <#presstrend> and/or the <#presstrendenglish> tags!

Beau, maybe you should make a habit of writing down notes of some of the information posted in the forums!

A while back, Steve (or someone else) posted information about the MET Office pressure trend terms...

The default 'AJAX-PHP Saratoga templates' are using the following:

Code: Select all

langBaroTrend:
  "Steady",  // pressure trend >= -0.7 and pressure trend  <= 0.7
  "Rising Slowly",  // pressure trend > 0.7 and pressure trend < 2.0
  "Rising Rapidly",  // pressure trend >= 2.0
  "Falling Slowly",  // pressure trend < -0.7 and pressure trend > -2.0
  "Falling Rapidly"  // pressure trend <= -2.0

The MET Office equivalent pressure trend terms - not sure about the 'Steady' one:

Code: Select all

langBaroTrendMET:
  'Rising very rapidly', // pressure trend >  6.0
  'Rising quickly',  // pressure trend >  3.5
  'Rising',  // pressure trend >  1.5
  'Rising slowly',  // pressure trend >  0.1
  'Steady',  // pressure trend >  0.1 and pressure trend > -0.1
  'Falling slowly',  // pressure trend > -0.1
  'Falling',  // pressure trend > -1.5
  'Falling quickly',  // pressure trend > -3.5
  'Falling very rapidly'  // pressure trend > -6.0

The following information was posted (I think) - again, not sure about the 'Steady' one:

• // The official barometric trends (9) from the UK MET Offices
  // Rising (very) rapidly = Pressure change of more than 6.0 hPa in the preceding three hours ( >= 6.0 )
  // Rising quickly = Pressure change of 3.6 to 6.0 hPa in the preceding three hours ( > 3.5 and <= 6.0 )
  // Rising = Pressure change of 1.6 to 3.5 hPa in the preceding three hours ( > 1.5 and <= 3.5 )
  // Rising slowly = Pressure change of 0.1 to 1.5 hPa in the preceding three hours ( > 0.1 and <= 1.5 )
  // Steady = No pressure change in the preceding three hours ( >= -0.1 and <= 0.1 )
  // Falling slowly = Pressure change of > 0.1 to 1.5 hPa in the preceding three hours ( < -0.1 and >= -1.5 )
  // Falling = Pressure change of 1.6 to 3.5 hPa in the preceding three hours ( < -1.5 and >= -3.5 )
  // Falling quickly = Pressure change of 3.6 to 6.0 hPa in the preceding three hours ( < -3.5 and > -6.0 )
  // Falling (very) rapidly = Pressure change of more than 6.0 hPa in the preceding three hours ( <= -6.0 )

[n9mfk]

Hi Ray
i been using that code but at -0.003 i was get undefined
an cumulus was reading Falling slowly
so i was checking to see if -0.003 be Falling slowly
beau

[gemini06720]

Beau, a pressure trend of -0.003 would mean the pressure is 'Steady' as it is less than -0.1 (or -0.100) used for 'Falling slowly'.

[steve]

-0.003 inHg/hr = -0.1 mb/hr = -0.3 mb in 3 hours = falling slowly