The information on Severe Weather Information Centre (SWIC) website is based on advisories issued by Regional Specialized Meteorological Centres (RMSCs), Tropical Cyclone Warning Centres (TCWCs), and official warnings issued by National Meteorological and Hydrological Services (NMHSs) for their respective countries or regions. The information is free for re-use by media or other websites. When doing so, it should be indicated that they are issued by the respective Tropical Cyclone RSMCs, TCWCs or NMHSs.
Official warnings in Common Alerting Protocol (CAP) format issued by NMHSs are incorporated in the SWIC 2.0. By early October 2018 when the beta version of SWIC 2.0 was launched, official CAP warnings issued by more than 60 NMHSs are displayed on the SWIC 2.0 employing a Geographical Information System (GIS)-based map. If no warning is found on land on the SWIC 2.0 map, it may be due to other reasons apart from no warning is in effect for that area. The reasons include but not limited to (i) warnings are issued but not made available in CAP format; and (ii) CAP feeds published are not accessible. Users may enable the layers "CAP warnings under construction" and "CAP feeds not accessible" under Settings (the 2nd button near the upper right-hand corner) to acknowledge the situation.
Users must be mindful that not all sea areas are covered by CAP warnings in this beta website of SWIC 2.0, though CAP warnings on the sea are also provided by some NMHSs. Users may turn on the layer of "Satellite Image" under Settings to get hold on major weather systems on sea.
Owing to technical reasons, some CAP warnings cannot be displayed on the map for some countries or territories. In those cases, a warning symbol filled with colour with highest level of severity, i.e. , , , or , will be displayed for the countries or territories on the map instead. CAP warnings issued by the NMHS will be listed out by following the hyperlink on the warning symbol.
In CAP warnings, core elements including urgency, severity and certainty are provided to facilitate better user understanding and response. In addition, the ISO 22324 is an international standard to provide guidelines for colour codes to indicate severity of hazard in public warnings. The SWIC 2.0 website makes use of the ISO 22324 to provide a visual effect on the map display to enable users to identify warnings with different level of severity quickly. In accordance with ISO 22324 guidelines and CAP standards, CAP warnings with severity of extreme, severe, moderate, and minor are coded in red, orange, yellow, and cyan respectively on the map display. Users should be mindful that colour of CAP warnings on the SWIC 2.0 map display is not directly related to the colour of warnings issued by some NMHSs.