Final jump to the breeding areas?

After a stopover of almost four weeks in Caspian Sea, transmitter bird Hilf decided yesterday evening (18 May) was time to leave and head further north into Siberia, Russia. It seems she picked a good day for migrating north as there were pretty strong southerly winds blowing, which gave her very favourable tail wind as is visualized in the picture below.

tailwinds

So far, birds were rather alike in their timing of migration and their migration route. Will we see the same? Is this this the right moment for the other birds to go? Are all birds heading for the same area? Hopefully we will find out soon.