The Met Office takes a weekly look at the science behind the UK and global weather headlines.

In this week's episode we hear how Swallows race ahead of changing Spring conditions and are changing their migration patterns. We also hear about the conditions that led to the arrival of Saharan dust in the UK this week and an explanation of equinox and equilux.

Presenter: Clare Nasir

Editor: Adrian Holloway

The Met Office is the United Kingdom's national weather service. Our website carries the latest UK and global weather forecasts, detailed information on weather types, climate science and UK weather records for previous months, seasons and years.

www.metoffice.gov.uk