My guest is Joanna Donnelly meteorologist and author of From Malin Head to Mizen Head, a lovely book about the almost meditative experience that is Irish Sea Area Forecast. Hers is the voice Irish radio listeners will hear last thing at night and first thing in the morning. We talk Hecto Pascals, my favourite of all the Pascals, how maths finds some patterns on this giant sphere of ours and why its best to give bad news first.