CoodaShooda
for full explanations of the codes
http://www.fesa.wa.gov.au/internet/d...aspx?MenuID=42
Here is a summary
BLUE ALERT - Precaution
A cyclone may produce gales within 48 hours. The community should commence taking precautions.
YELLOW ALERT - Action
There is a significant risk that destructive winds will occur in your area and you should take action.
RED ALERT - Shelter
Destructive winds are likely to occur very soon and you should move immediately to shelter.
ALL CLEAR – WITH CAUTION
The wind and storm surge danger has passed, although ground hazards may still exist.
Or
Blue Alert - QF etc Cancel Services
Yellow Alert - Local IFR service stop
Red Alert - Your VFR Charter Operator is the only one flying