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Strange cold spot?

Strange cold spot?

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Message 102 - Posted: 5 Aug 2004, 19:52:19 UTC
Last modified: 5 Aug 2004, 19:52:51 UTC

Hi, it think it isn't normal that there is a cold spot in the afternoon above the sahara in Africa.

Took a look a this screen:

<img src="http://www.statsfreakz.net/strange.gif">
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Message 175 - Posted: 6 Aug 2004, 11:54:45 UTC - in response to Message 102.  

&gt; Hi, it think it isn't normal that there is a cold spot in the afternoon above
&gt; the sahara in Africa.


Same thing with my run !! A cold spot (betwwen -12 and -24°C) appears in tropical areas in Africa then disappears and appears again... Its position is not fixed, it is between Chad and Mauritania.

And yes, I think that is a bit weird. But maybe it is due to the initial conditions of the run and the phenomenon will disappear.
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Message 195 - Posted: 6 Aug 2004, 14:36:55 UTC - in response to Message 175.  

&gt; &gt; Hi, it think it isn't normal that there is a cold spot in the afternoon
&gt; above
&gt; &gt; the sahara in Africa.
&gt;
&gt;
&gt; Same thing with my run !! A cold spot (betwwen -12 and -24°C) appears in
&gt; tropical areas in Africa then disappears and appears again... Its position is
&gt; not fixed, it is between Chad and Mauritania.

I'm getting a more extreme version of his on a couple of runs.

The worst is run 005_000024990 (late April/early May 1812), which starts with a cold cell in the east of India at 0430, covers most of the sub-continent at 0730, and develops cold areas at either coast of Saudi Arabia. Its track across Africa starts in Sudan at 0930 and leaves Mauritania at 1930.

Run 004_000014989 is not quite so extreme. It skips Saudi Arabia but does have a day time cold spot on the Egyptian Mediterranean coast.
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Message 198 - Posted: 6 Aug 2004, 14:57:39 UTC

I appear to have a cold Australia -

<img src="http://members.lycos.co.uk/fillado/cpdn.gif">
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Message 316 - Posted: 7 Aug 2004, 14:28:46 UTC - in response to Message 195.  

Looking at the visualisations again I think the problem is not cold spots. It's starting to look more like a colour mapping discrepancy at the top end of the scale to me. I'm now getting these spots all over the place surrounded by cells at greater than 30C on 3 different models.

<a href="http://climateapps2.oucs.ox.ac.uk/cpdnboinc/team_display.php?teamid=3"><img src="http://www.teampicard.net/templates/fisubice/images/phpbb2_logo.jpg"></a>
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Message 322 - Posted: 7 Aug 2004, 15:24:18 UTC
Last modified: 7 Aug 2004, 15:32:04 UTC

<img src="http://www.flexbeta.net/betaguy/cool%20africa.PNG"><br />
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Message 342 - Posted: 7 Aug 2004, 18:16:58 UTC - in response to Message 322.  

hmmm, my guess is it's "out of bounds" hot-spots (looks like Saharan Africa so that would make sense). we'll double-check this in the vis code.

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Message 654 - Posted: 10 Aug 2004, 16:44:01 UTC

Also in my model 00ct_000025446_0 strange white Spots in hot areas like Africa or India. Maybe also "out of bounds" temperatue-areas.
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