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Meteorological Weather Quiz (OQ)

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onewithnature
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Re: Meteorological Weather Quiz (OQ)

Unread postby onewithnature » Fri Apr 10, 2009 1:59 am

Since no-one else has posted, I'll give it a go:

Sometimes one sees rain falling from a distant cloud, but the rain does not reach the ground. What is this phenomenon known as?
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Re: Meteorological Weather Quiz (OQ)

Unread postby onewithnature » Sat Apr 11, 2009 1:30 am

Hint: the term sounds like a sign of the Zodiac!
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Re: Meteorological Weather Quiz (OQ)

Unread postby LeapingLeopard » Sat Apr 11, 2009 8:34 pm

I'm not sure virgo capricorn or aries?

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Re: Meteorological Weather Quiz (OQ)

Unread postby onewithnature » Sun Apr 12, 2009 12:55 am

You're guessing LL; but I suppose that isn't disallowed :roll:

It IS one of those that the term is similar to, but which one, and what is the correct name for falling rain that doesn't reach the ground?
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Re: Meteorological Weather Quiz (OQ)

Unread postby Timepilot » Tue Apr 14, 2009 7:35 am

OWN, is'nt this called virga?

And no, I did'nt catch any flies - caught a couple of beaut trout though :P
“ Every year elephants were becoming scarcer and wilder south of the Zambezi, so that it had become impossible to make a living by hunting at all. ” FC Selous 1881

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Re: Meteorological Weather Quiz (OQ)

Unread postby onewithnature » Tue Apr 21, 2009 2:51 am

Timepilot :clap: :clap: Virga it is! :thumbs_up:

(Hope you buttered and garlicked that trout up, braaiing it in foil with tomatoes and onions and ...?)
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Re: Meteorological Weather Quiz (OQ)

Unread postby onewithnature » Tue Apr 21, 2009 2:54 am

Virga occurs when the falling rain falls through warm air that is hot enough to evaporate the droplets before they reach the ground. It looks like a dark curtain suspended in mid-air.
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Re: Meteorological Weather Quiz (OQ)

Unread postby onewithnature » Wed Apr 22, 2009 2:11 am

What is a rain shadow, and why does it happen?
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Re: Meteorological Weather Quiz (OQ)

Unread postby Timepilot » Wed Apr 22, 2009 3:44 am

A rain shadow is the dry area on the leeward (from prevailing winds) side of a mountain / hill range. The mountains block the prevailing winds from carrying the rain bearing clouds over the mountain creating a dry area.

(nope - returned them because I had no where to store them :( but it was fun catching them!
“ Every year elephants were becoming scarcer and wilder south of the Zambezi, so that it had become impossible to make a living by hunting at all. ” FC Selous 1881

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Re: Meteorological Weather Quiz (OQ)

Unread postby onewithnature » Wed Apr 22, 2009 3:52 am

TP :clap: :clap:

Just to add, the rain clouds normally discharge their precipitation as they climb the mountain on the side from where the clouds are coming. By the time they reach the top, their moisture is sufficiently spent to prevent any more rain falling on the other side of the mountain; thereby creating a dry area known as a rain shadow.
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Re: Meteorological Weather Quiz (OQ)

Unread postby Timepilot » Wed Apr 22, 2009 4:21 am

:redface: Yep, sorry OWN, forgot that bit.

Okay then, what is the definition of dew point temperature and how does it relate to relative humidity?
“ Every year elephants were becoming scarcer and wilder south of the Zambezi, so that it had become impossible to make a living by hunting at all. ” FC Selous 1881

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Re: Meteorological Weather Quiz (OQ)

Unread postby onewithnature » Wed Apr 22, 2009 6:12 am

The amount of water vapor in the air at any given time is usually less than that required to saturate the air. The relative humidity is the percentage of the actual humidity divided by the humidity that is required to saturate the air at any given temperature. The water vapour in air is usually measured in grams of water per cubic metre of air.

Simply put, relative humidity is the amount of moisture in the air compared to what the air can "hold" at a particular temperature. When the air is saturated with water vapour (i.e. cannot hold the amount there is), the excess condenses as dew on surfaces. There should be no wind and a cloudless sky for dew to condense out at the dew point.
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Re: Meteorological Weather Quiz (OQ)

Unread postby onewithnature » Wed Apr 22, 2009 6:36 am

How do snowflakes form into their amazingly fluffly, complex, symmetrical shapes?
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Re: Meteorological Weather Quiz (OQ)

Unread postby onewithnature » Wed Apr 22, 2009 6:37 am

Oops, Timepilot; I need to wait for your stamp of approval, or disappproval, as to the quality of my answer before posting my own. Ignore my question for now, then ...
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Re: Meteorological Weather Quiz (OQ)

Unread postby Timepilot » Wed Apr 22, 2009 8:00 am

No problemo OWN.

:hmz: That was a great answer :thumbs_up: .

However, one small correction.

Dew point temperature is a measure of the relative humidity as you have said, but it is the temperature where the air has cooled down sufficiently for dew to form. It is a measure of both dry bulb and wet bulb temperatures ( :wink: now that may get some people scurrying :whistle: )

Given this, dew can actually form even though the air is not saturated. When the dry bulb temperature is the same as the dew point then the air is saturated and the relative humidity is 100%.

As your answer was not technically wrong, we'll go with you as IT and your question is now back in play :tongue:

I won't answer - I hate snow :lol:
“ Every year elephants were becoming scarcer and wilder south of the Zambezi, so that it had become impossible to make a living by hunting at all. ” FC Selous 1881


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