I haven't yet seen swallows over Bristol, though we saw them in Pembrokeshire last week. But the swifts arrived a few days ago, and occasionally you can hear their screams as they zoom around the houses. I thought that it is usually the swallows who get heree first, and wondered if there is any weather lore that relates to their relative arrival times.
If in doubt, make something up. So:
Swifts before swallows
Sunny intervals with scattered showers to follow
Swallows before swifts
You'll probly get snowdrifts
Easy, this folk wisdom lark.
I am all packed up and ready to go to Dublin. Not with swallows' wings, but with those of Ryanair.