if trend > 6.0:
        return _('rising very rapidly')
    elif trend > 3.5:
        return _('rising quickly')
    elif trend > 1.5:
        return _('rising')
    elif trend >= 0.1:
        return _('rising slowly')
    elif trend < -6.0:
        return _('falling very rapidly')
    elif trend < -3.5:
        return _('falling quickly')
    elif trend < -1.5:
        return _('falling')
    elif trend <= -0.1:
        return _('falling slowly')
    return _('steady')

function press_trend(trend) {
if (trend > 6.0)
	{
        return "in aumento molto rapido";
    }
    else if (trend > 3.5)
    {
        return "in rapido aumento";
    }
    else if (trend > 1.5)
    {
        return "in aumento";
    }
    else if (trend >= 0.1)
    {
        return "in lento aumento";
    }
    else if (trend < -6.0)
    {
        return "in diminuzione molto rapida";
    }
    else if (trend < -3.5)
    {
        return "in rapida diminuzione";
    }
    else if (trend < -1.5)
    {
        return "in diminuzione";
    }
    else if (trend <= -0.1)
    {
        return "in lenta diminuzione";
    }
    else
    {
   		return "stabile";
    }
}

# compute pressure trend
            new_data['pressure_trend'] = None
            if new_data['rel_pressure']:
                target = new_data['idx'] - HOURx3
                while (len(pressure_history) >= 2 and
                       abs(pressure_history[0][0] - target) >
                       abs(pressure_history[1][0] - target)):
                    pressure_history.popleft()
                if (pressure_history and
                        abs(pressure_history[0][0] - target) < HOUR):
                    new_data['pressure_trend'] = (
                        new_data['rel_pressure'] - pressure_history[0][1])