Formula for determining cloud bases
#1
On Reserve
Thread Starter
Joined APC: Oct 2008
Posts: 20
Formula for determining cloud bases
Does anyone have the formula for determing the cloud bases?
Think I heard something like this: Temperature minus dewpoint divided by 4.4, then multiplyed by 1000. It did seem to work.......
Think I heard something like this: Temperature minus dewpoint divided by 4.4, then multiplyed by 1000. It did seem to work.......
#2
I believe that's correct, and I want to say for some reason or another that only works with cumulus bases. But I could be wrong.
#3
Line Holder
Joined APC: Sep 2008
Position: Cessna 172 Right Seat
Posts: 71
Yeah this seems to be the same formula I remember. I also remember that there was something in there about cumulus bases but I'm not 100% about that either. Hehe multipilot is an @$$ chief CFI. Sweet.
#7
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Joined APC: Jun 2008
Position: Reclined
Posts: 2,168
temp - DP X either 200 (if using C) or 400 (if using F)
If reading temps from a digital ATIS, use the T000000 series of numbers for the exact temp spread.... IE temp 6 C and Dewpoint 7 C in the ATIS can be found again at the end as T056074 meaning 5.6 degrees C temp and 7.4 degrees C on the DP... the difference being 1.8. 1.8 x 200 = 360 feet estimated bases... with just the ATIS 6/7 you'd come up with 200 for the bases and be significantly off....
yes, if you HAVE to be mr perfect, use the 4.4 and 2.2 OR 440 feet and 220 feet per degree.
If reading temps from a digital ATIS, use the T000000 series of numbers for the exact temp spread.... IE temp 6 C and Dewpoint 7 C in the ATIS can be found again at the end as T056074 meaning 5.6 degrees C temp and 7.4 degrees C on the DP... the difference being 1.8. 1.8 x 200 = 360 feet estimated bases... with just the ATIS 6/7 you'd come up with 200 for the bases and be significantly off....
yes, if you HAVE to be mr perfect, use the 4.4 and 2.2 OR 440 feet and 220 feet per degree.
#8