Graphical Severe Weather Warnings in South Australia
The Bureau of Meteorology has upgraded severe thunderstorm warning services in four states (NSW, Queensland, Victoria and SA) to provide map-based warnings via the internet. In conjunction with this, the Bureau in South Australia has upgraded severe weather warnings in a similar manner. The new Severe Weather Warnings contain maps which complement the warning text and help people to more easily picture the areas under threat from severe weather.
Severe Weather warnings are provided for potentially hazardous or dangerous weather that is not directly related to severe thunderstorms, tropical cyclones or bushfires.
In South Australia, severe weather warnings are provided for
Severe Weather Warnings for South Australia
The Bureau of Meteorology issues Severe Weather Warnings whenever severe weather (as defined above) is occurring in an area or is expected to develop or move into an area. The warnings describe the area under threat and the expected hazards. Warnings are issued with varying lead-times, depending on the weather situation, and range from just an hour or two up to about 24 hours.
Warnings are distributed widely to the media and emergency services, and are available to the public via the internet and various telephone and fax-based services. A coloured image is available with the warning on the internet, which shows the area at risk in map format. This service is provided for all parts of South Australia.
Here is an example, which shows what these warnings look like.
Important things to note:
The area covered by the Warning is shaded yellow and represents the area where there is a potential threat from severe weather. The area may consist of all or part of one or several weather forecast districts.
The issue time is the time that the Bureau of Meteorology transmitted the Warning. It is displayed near the top of the warning text and also in the top right hand corner of the map, in local South Australian time; that is Central Standard Time (CST) or Central Daylight Savings Time (CDT).
Validity Period and Update Frequency
Severe weather warnings in South Australia are valid for up to 24 hours. The warnings are updated at least every 3 hours, but more frequently if the situation warrants. The expected issue time of the next Warning is given in the text.
The divisions on the chart indicate the boundaries of the Bureau’s weather forecast districts. Districts are labelled with an abbreviation, as follows: