We are currently being flooded (pun intended, sorry, we'll get our coat) by an unprecedented amount of traffic to the web server. Work is in progress to move to a newer, bigger and more powerful server, and we hope to have got that up and running within a few days.
In the meantime, please bear with us if the site seems slow. Find out here how your support can help.
(by percentage above normal high)
(by percentage below normal minimum)
(by absolute value above normal high)
(by absolute value below normal minimum)
Snapshot stats exclude seasonal streams (ie, those which are normally completely dry for at least part of the year), tidal locations and locations where insufficient recent data is available.