hi interflug.
yes the term severe is standard.as they gather their information with sat survey or any other informations sources.
like this one.
http://www.star.nesdis.noaa.gov/smcd...y/TIAVN18a.GIF
.
but it s obvious that we don t received any messages from them if we re crossing the ITZ or the the bengal gulf during the monsoon.cause it will be useless .