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General Weather/Earth Sciences Topics => Other Weather Topics => Topic started by: attherubicon on March 28, 2021, 09:38:29 PM

I’v see this formula in several places for estimating the height of cloud bases:
CB ≈ (T  Td)*1000/4.4
I’m puzzled by the 4.4. I would expect a number for the dry adiabatic lapse rate, but Not 4.4

I’v see this formula in several places for estimating the height of cloud bases:
CB ≈ (T  Td)*1000/4.4
I’m puzzled by the 4.4. I would expect a number for the dry adiabatic lapse rate, but Not 4.4
From the Cloud Base Calculator site:
The rate at which air cools is estimated at 5.4°F per 1000 feet of altitude. The dew point decreases slower  at about 1.0°F per 1000 feet. That means that per 1000 feet, the spread decreases by 4.4°F.

Thank you.

I’v see this formula in several places for estimating the height of cloud bases:
CB ≈ (T  Td)*1000/4.4
I’m puzzled by the 4.4. I would expect a number for the dry adiabatic lapse rate, but Not 4.4
The rate at which air cools is estimated at 5.4°F per 1000 feet of altitude.
Just as an FYI, known as "standard lapse rate".