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name="query" value=""><br> <input class="buttons" type="submit" name="submit" value="Search"> </td> <td valign="top"> <input type="checkbox" name="def"> Search Definitions<br> <input type="checkbox" name="case">case sensitive </td> </tr> </table> </form> <a href="/web/20090403084329/http://amsglossary.allenpress.com/glossary/preface1">First Edition Preface</a>  <a href="/web/20090403084329/http://amsglossary.allenpress.com/glossary/preface2">Second Edition Preface</a>  <a href="/web/20090403084329/http://amsglossary.allenpress.com/glossary/acknowledge">Acknowledgments</a> </td> </tr> </table> <table width="550" cellpadding="5"> <tr> <td> <br><br><hr> <table> <tr> <td valign="top"><li></td> <td><b><font color="#007177">diamond dust</font></b>Small <a href="/web/20090403084329/http://amsglossary.allenpress.com/glossary/search?id=ice-crystal1">ice crystals</a> falling from an apparently cloudless sky, (often, but not always, at night). <dd>Crystals originate from air having a higher <a href="/web/20090403084329/http://amsglossary.allenpress.com/glossary/search?id=moisture-content1">moisture content</a> above a <a href="/web/20090403084329/http://amsglossary.allenpress.com/glossary/search?id=thermal-inversion1">thermal inversion</a> aloft, where <a href="/web/20090403084329/http://amsglossary.allenpress.com/glossary/search?id=mixing1">mixing</a> leads to <a href="/web/20090403084329/http://amsglossary.allenpress.com/glossary/search?id=nucleation1">nucleation</a> and growth of crystals at temperatures near −40°C. </td></tr></table> </td></tr></table></body></html> </td></tr></table></body></html>