I just changed my Weather block code, which I got from the snippets section to this new one from The Weather Channel.
In a Javascript/html block just enter this code:
<center><table cellpadding="0" cellspacing="0">
<tr>
<td align="center" width="120">
<a href="http://www.weather.com?par=internal&code=1025899396&site=logo&promo=english"><img border="0" src="http://image.weather.com/pics/oap/slogo.gif"></a>
</td>
</tr>
<tr>
<td align="center" width="120">
<form target="_blank" method="post" action="http://www.weather.com/cgi-bin/uncgi/zip_city_search.cgi?par=internal&code=1025899396&site=logo&promo=english">
<table cellpadding="0" cellspacing="0">
<tr>
<td valign="center" width="120" colspan="2">
<font face="Arial, Helvetica, Chicago, Sans Serif" color="#004371" size="2"> Enter city or US Zip </font>
</td>
</tr>
<tr>
<td width="40" align="left" valign="bottom">
<input name="destination" type="text" size="8" value="">
</td>
<td width="20" align="left" valign="bottom">
<input type="image" src="http://image.weather.com/pics/button_go.gif" width="26" height="23" border="0" alt="go!" value="Go City">
</td>
</tr>
</table>
</form>
</td>
</tr>
</table></center>
I registered on their site to get the code, they have other versions -
http://www.weather.com/services/oap.html?from=servicesindex