<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/008222de-06f1-451e-996e-3ed184b97946/38BE61CA-76EE-4423-BDDE-E803D1CBF1D3/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://www.collthings.co.uk/2008/06/10-very-rare-clouds.html" href="http://www.collthings.co.uk/2008/06/10-very-rare-clouds.html" style="font-size: 11px;">www.collthings.co.uk</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.collthings.co.uk/2008/06/10-very-rare-clouds.html"><SPAN>1. Nacreous Clouds</SPAN></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.collthings.co.uk/2008/06/10-very-rare-clouds.html">These rare clouds, sometimes called mother-of-pearl clouds, are 15 - 25km (9 -16 miles) high in the stratosphere and well above tropospheric clouds.</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.collthings.co.uk/2008/06/10-very-rare-clouds.html"><div align="center"><img src="http://content9.clipmarks.com/blog_cache/www.collthings.co.uk/img/72037F15-6F0B-4493-AEFC-A5E9785C27F2" alt="" /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.collthings.co.uk/2008/06/10-very-rare-clouds.html"><SPAN>2. Mammatus Clouds</SPAN></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.collthings.co.uk/2008/06/10-very-rare-clouds.html"><div align="center"><img src="http://content6.clipmarks.com/blog_cache/www.collthings.co.uk/img/258C5C36-71F7-4DE3-829E-7C798FCAC2B7" alt="" /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.collthings.co.uk/2008/06/10-very-rare-clouds.html"><div align="center"><img src="http://content7.clipmarks.com/blog_cache/www.collthings.co.uk/img/85380DC1-78DA-4702-AE72-F2D962B52E94" alt="" /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.collthings.co.uk/2008/06/10-very-rare-clouds.html"><DIV>Sometimes very ominous in appearance, <A href="http://en.wikipedia.org/wiki/Mammatus_cloud">mammatus clouds</A> are harmless and do not mean that a tornado is about to form - a commonly held misconception. In fact, mammatus are usually seen after the worst of a thunderstorm has passed.</DIV></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.collthings.co.uk/2008/06/10-very-rare-clouds.html"><div align="center"><img src="http://content8.clipmarks.com/blog_cache/www.collthings.co.uk/img/DB704DFB-75F8-4E15-A646-C409C448C3A2" alt="" /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.collthings.co.uk/2008/06/10-very-rare-clouds.html"><SPAN>3. Altocumulus Castelanus</SPAN></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.collthings.co.uk/2008/06/10-very-rare-clouds.html"><div align="center"><img src="http://content9.clipmarks.com/blog_cache/www.collthings.co.uk/img/8CBD59D7-057D-4310-9709-55696BE9760A" alt="" /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.collthings.co.uk/2008/06/10-very-rare-clouds.html"><SPAN>4. Noctilucent Clouds</SPAN></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.collthings.co.uk/2008/06/10-very-rare-clouds.html"><div align="center"><img src="http://content6.clipmarks.com/blog_cache/www.collthings.co.uk/img/026C5AD9-0F87-420D-970F-AC94B4F8D347" alt="" /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.collthings.co.uk/2008/06/10-very-rare-clouds.html"><div align="center"><img src="http://content7.clipmarks.com/blog_cache/www.collthings.co.uk/img/49A53CBF-02E6-43C9-9B73-A648FCE59102" alt="" /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.collthings.co.uk/2008/06/10-very-rare-clouds.html"><SPAN>5. Mushroom Clouds</SPAN></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.collthings.co.uk/2008/06/10-very-rare-clouds.html"><div align="center"><img src="http://content8.clipmarks.com/blog_cache/www.collthings.co.uk/img/8A854162-F095-4C20-88ED-A695053E978D" alt="" /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.collthings.co.uk/2008/06/10-very-rare-clouds.html"><SPAN>6. Cirrus Kelvin-Helmholtz</SPAN></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.collthings.co.uk/2008/06/10-very-rare-clouds.html"><div align="center"><img src="http://content9.clipmarks.com/blog_cache/www.collthings.co.uk/img/C9C97362-49FD-43BC-A58A-B7B3AA60B50D" alt="" /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.collthings.co.uk/2008/06/10-very-rare-clouds.html"><SPAN>7. Lenticular Clouds</SPAN></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.collthings.co.uk/2008/06/10-very-rare-clouds.html"><div align="center"><img src="http://content6.clipmarks.com/blog_cache/www.collthings.co.uk/img/83E02592-3854-40E1-84F7-96F3FF0CA7A9" alt="" /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.collthings.co.uk/2008/06/10-very-rare-clouds.html">Lenticular clouds sometimes form at the crests of these waves. Under certain conditions, long strings of lenticular clouds can form, creating a formation known as a wave cloud.</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.collthings.co.uk/2008/06/10-very-rare-clouds.html"><SPAN>8. Roll Clouds</SPAN></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.collthings.co.uk/2008/06/10-very-rare-clouds.html"><div align="center"><img src="http://content7.clipmarks.com/blog_cache/www.collthings.co.uk/img/38C5E6B9-4F98-4346-986E-D82940F4AEF3" alt="" /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.collthings.co.uk/2008/06/10-very-rare-clouds.html">Cool air sinking air from a storm cloud’s downdraft spreads out across the surface with the leading edge called a gust front.</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.collthings.co.uk/2008/06/10-very-rare-clouds.html"><div align="center"><img src="http://content8.clipmarks.com/blog_cache/www.collthings.co.uk/img/39158E38-D4B5-46F6-AF68-1B570D8C7FEE" alt="" /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.collthings.co.uk/2008/06/10-very-rare-clouds.html"><div align="center"><img src="http://content9.clipmarks.com/blog_cache/www.collthings.co.uk/img/18191880-9EC4-415D-8B2E-6D15F640D93C" alt="" /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.collthings.co.uk/2008/06/10-very-rare-clouds.html"><SPAN>9. Shelf Clouds</SPAN></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.collthings.co.uk/2008/06/10-very-rare-clouds.html"><div align="center"><img src="http://content6.clipmarks.com/blog_cache/www.collthings.co.uk/img/242B0150-3689-47CD-BFB5-185510BEA255" alt="" /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.collthings.co.uk/2008/06/10-very-rare-clouds.html"><div align="center"><img src="http://content7.clipmarks.com/blog_cache/www.collthings.co.uk/img/BE02A9D5-95EC-4B06-BAD9-CD8035488B40" alt="" /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.collthings.co.uk/2008/06/10-very-rare-clouds.html"><SPAN>10. Stratocumulus Clouds</SPAN></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.collthings.co.uk/2008/06/10-very-rare-clouds.html"><div align="center"><img src="http://content8.clipmarks.com/blog_cache/www.collthings.co.uk/img/1AA7FBFC-E50D-4895-AAF6-89F7E222E201" alt="" /></div></blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;">&nbsp;</td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/38BE61CA-76EE-4423-BDDE-E803D1CBF1D3/blog/" title="blog or email this clip"><img src="http://content9.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>

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