Met office EMERGENCY warning for heavy snow issued!!!

This is something I have NEVER seen before.  An Emergancy warning of heavy snow including Kent.

The link at the top of the page will take you to the met office page but the Raw Data output is as follows;

NATIONAL SEVERE WEATHER WARNING SERVICE
EMERGENCY Flash Warning of
- Very Heavy Snowfall
For the following areas
- Essex (Severe)
- Gtr London (Severe)
- Kent (Severe)
- Medway (Severe)
- Southend-on-Sea (Severe)
- Thurrock (Severe)
Very heavy snowfall is expected across east London and parts of the
Thames estuary, south Essex and north Kent with 15cm of snow likely
in 3 hours. Major disruption is expected.
Issued by the Met Office at 22:08 on Thursday, 17th December 2009
Valid from 22:06 on Thursday, 17th December 2009
until 01:00 on Friday, 18th December 2009
For enquiries regarding this warning -
please contact the Met Office customer centre
- Phone: 0870 900 0100
- Fax : 0870 900 5050
- Email: enquiries@metoffice.gov.uk