Accessing "value" value in CartoCSS

In a Torque layer you only have value parameter, but it's only accesible in order to be compared in CartoCSS selectors, but you can't use its value

Test case:

Dataset: https://team.cartodb.com/u/solutions/tables/metar_db
The idea is to render the meteo data there in a torque layer (time field: t) using temp as color param and visibility as radius param. In order to achieve that, I have generated an aggregated field in my table called torque :

update metar_db set torque = 255 *(round(temp/4)+ round(visibility/500)/100 - min )/ (max-min)

Being min= -1, max = 8 from round(temp/4)+ round(visibility/500)/100

Then I try to extract both cat_temp = temp/4 and cat_visibility=visibility/500 and render color and radius using this CartoCSS:

/** torque_cat visualization */

Map {
-torque-frame-count:256;
-torque-animation-duration:30;
-torque-time-attribute:"t";
-torque-aggregation-function:"max(torque)";
-torque-resolution:1;
-torque-data-aggregation:linear;
}

#metar_db{
  comp-op: source-over;
  marker-fill-opacity: 0.9;
  marker-line-color: #FFF;
  marker-line-width: 0;
  marker-line-opacity: 1;
  marker-type: ellipse;
  marker-width: 6;
  marker-fill: #0F3B82;
}
#metar_db[frame-offset=1] {
 marker-width:8;
 marker-fill-opacity:0.45; 
}
#metar_db[frame-offset=2] {
 marker-width:10;
 marker-fill-opacity:0.225; 
}
#metar_db [ value <= 255] {
   marker-fill: #B10026;
   marker-width: value - 226.6666666667;
}
#metar_db [ value <= 226.6666666667] {
   marker-fill: #E31A1C;  
   marker-width: value - 198.3333333333;
}
#metar_db [ value <= 198.3333333333] {
   marker-fill: #FC4E2A;
   marker-width:value - 170;
}
#metar_db [ value <= 170] {
   marker-fill: #FD8D3C;
   marker-width: value - 141.6666666667;
}
#metar_db [ value <= 141.6666666667] {
   marker-fill: #FEB24C;
   marker-width: value - 113.3333333333;
}
#metar_db [ value <= 113.3333333333] {
   marker-fill: #FED976;
   marker-width: value - 85;
}
#metar_db [ value <= 85] {
   marker-fill: #FFFFB2;
   marker-width: value -56.6666666667;
}
#metar_db [ value <= 56.6666666667] {
   marker-fill: #FFFFB2;
   marker-width: value - 28.3333333333;
}
#metar_db [ value <= 28.3333333333] {
   marker-fill: #FFFFB2;
   marker-width: value;
}
#metar_db [ value <= 0] {
   marker-fill: #FFFFB2;
    marker-width: 10;
}

But I get an error message like: Invalid value for marker-width, the type float is expected. value (of type keyword) was given.

CartoDB / torque

Accessing "value" value in CartoCSS #249