The last 3 mid-week eruptions have been Tuesday, Tuesday night, and Wednesday respectively and weekend eruptions have been advancing about one day a week too (Thursday night, Saturday, Sunday). So, the most likely is Wednesday night or Thursday if it keeps up the same pattern. Of course it's a geyser so it will probably do something different. Based on the just under 3 - to - 5 day intervals recently, the broader chance would be mid-day Wednesday through Friday. And then it could do something completely different, but I hope it stays nice and cooperative. Good luck! Graham. From: geysers-bounces at lists.wallawalla.edu [mailto:geysers-bounces at lists.wallawalla.edu] On Behalf Of Ott, Stephen Sent: Monday, August 24, 2009 1:49 PM To: Geyser Observation Reports Subject: RE: [Geysers] Fan & Mortar 8/23/09 I have a flexible schedule this week to be in the Upper Geyser Basin. Based upon past experience, is there a 'best guess' on which day Fan and Morter may erupt next? Thanks. Stephen _____ From: geysers-bounces at lists.wallawalla.edu on behalf of David Monteith Sent: Sun 8/23/2009 6:28 PM To: Geyser Reports Subject: [Geysers] Fan & Mortar 8/23/09 Fan and Mortar erupted 8/23/09 at 1254 _______________________________________________ Geysers mailing list Geysers at lists.wallawalla.edu -------------- next part -------------- An HTML attachment was scrubbed... URL: </geyser-list/attachments/20090825/f280d122/attachment.html>