For France and Northwestern Europe maps only, the time in yellow in the upper-right corner is in local timezone.
The colors relates to the number of lightning strikes in the last 30 mins aggregated to 0.5 degree of horizontal resolution.
Also an overlay plot of last main synoptic (:00) hour METAR observed thunderstorms and cumulonimbus.
Decoding time stamp example:
150428/1500: year=15; month=04 (April); day=28; 1500=15:00 UTC
Disclaimer: Lightning data is provided without warranty of any kind as to accuracy or timeliness. Not for protection of life or property, nor valid for insurance quote claims.