| Topic: |
Science > Physics |
| User: |
"Dr. Pastor" |
| Date: |
22 Apr 2006 06:00:27 PM |
| Object: |
About clouds? |
On blue sky I see 4, 6 "puff" of clouds.
Why those clouds do not disperse quickly?
Why did they form at all at the first case?
Thanks for any guidance.
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| User: "" |
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| Title: Re: About clouds? |
22 Apr 2006 06:55:02 PM |
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Dr. Pastor <elpX@adsihqx.com> wrote:
On blue sky I see 4, 6 "puff" of clouds.
Why those clouds do not disperse quickly?
Why did they form at all at the first case?
Thanks for any guidance.
They form because the temperature at that altitude is below the dew point.
They don't disperse because the temperature is below the dew point.
Air cools at about 5.4 F per 1000 feet.
The dew point cools at about 1 F per 1000 feet.
The average convergence is therefore about 4.4 F per 1000 feet.
If you take the surface temperature minus the surface dew point and
divide by 4.4 and multiple by 1000, you have the appoximate altitude
of the base of the clouds.
Don't know the surface temperature and dewpoint at your location?
Go to http://adds.aviationweather.noaa.gov/metars/ and pick the airport
closest to you.
Aren't you glad you asked?
--
Jim Pennino
Remove .spam.sux to reply.
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| User: "Hero" |
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| Title: Re: About clouds? |
22 Apr 2006 06:28:53 PM |
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Dr. Pastor schrieb:
On blue sky I see 4, 6 "puff" of clouds.
Why those clouds do not disperse quickly?
Quick is relative.
In very dry air the clouds, which form behind an
aeroplane high up, disperse within a few seconds.
This a sign for sunny weather.
In moist air they might stay on for hours, until in the
evening the whole sky is covered with these lines.
Most often the weather will turn to rain within a day.
Why did they form at all at the first case?
Clouds often form, when moist airmasses are
rising due to sunshine and they reach a layer,
which is colder - so the moisture condensates into
something, what You experience as fog, into droplets
of water.
Thanks for any guidance.
Welcome.
Hero
PS. What's:
....@adsihqX.com ?
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