Last Known Eruption
50d 20h 18m ago

Latest Eruptions

Eruption DurationInterval
31 Aug 2019 @ 112524d 17h 17m
06 Aug 2019 @ 18082m
06 Aug 2019 @ 18062m
06 Aug 2019 @ 18043m
06 Aug 2019 @ 18012m
06 Aug 2019 @ 17594m
06 Aug 2019 @ 17557m
06 Aug 2019 @ 17482m
06 Aug 2019 @ 17462m
06 Aug 2019 @ 174412m
06 Aug 2019 @ 17323m
06 Aug 2019 @ 17291m
06 Aug 2019 @ 17282m
06 Aug 2019 @ 17262m
06 Aug 2019 @ 1724~2s 6m
06 Aug 2019 @ 17183m
06 Aug 2019 @ 17153m
06 Aug 2019 @ 17121m
06 Aug 2019 @ 171122m
06 Aug 2019 @ 16492m
06 Aug 2019 @ 16474m
06 Aug 2019 @ 16432m
06 Aug 2019 @ 16413m
06 Aug 2019 @ 16381m
06 Aug 2019 @ 16371m
06 Aug 2019 @ 16362m
06 Aug 2019 @ 16341m
06 Aug 2019 @ 16332m
06 Aug 2019 @ 16312m
06 Aug 2019 @ 16292m
06 Aug 2019 @ 16272m
06 Aug 2019 @ 16254m
06 Aug 2019 @ 16214m
06 Aug 2019 @ 16176m
06 Aug 2019 @ 16112m
06 Aug 2019 @ 16097m
06 Aug 2019 @ 16025m
06 Aug 2019 @ 15571m
06 Aug 2019 @ 15562m
06 Aug 2019 @ 15541m
06 Aug 2019 @ 15531m
06 Aug 2019 @ 15522-3s2m
06 Aug 2019 @ 15506m
06 Aug 2019 @ 15442m
06 Aug 2019 @ 15423m
06 Aug 2019 @ 15392m
06 Aug 2019 @ 15375m
06 Aug 2019 @ 15323m
06 Aug 2019 @ 15291m
06 Aug 2019 @ 15281m
06 Aug 2019 @ 15272m
06 Aug 2019 @ 15251m
06 Aug 2019 @ 15241m
06 Aug 2019 @ 15231m
06 Aug 2019 @ 15221m
06 Aug 2019 @ 15212m
06 Aug 2019 @ 15196m
06 Aug 2019 @ 15137m
06 Aug 2019 @ 15061m
06 Aug 2019 @ 15051d 1h 24m
05 Aug 2019 @ 13414m
05 Aug 2019 @ 13371m
05 Aug 2019 @ 13368m
05 Aug 2019 @ 13283m
05 Aug 2019 @ 13256m
05 Aug 2019 @ 13192m
05 Aug 2019 @ 13179m
05 Aug 2019 @ 13082m
05 Aug 2019 @ 13069m
05 Aug 2019 @ 125710m
05 Aug 2019 @ 12472m
05 Aug 2019 @ 12452m
05 Aug 2019 @ 12435m
05 Aug 2019 @ 12381m
05 Aug 2019 @ 12372m
05 Aug 2019 @ 12351m
05 Aug 2019 @ 12342m
05 Aug 2019 @ 12321m
05 Aug 2019 @ 12314m
05 Aug 2019 @ 12271m
05 Aug 2019 @ 122615m
05 Aug 2019 @ 12112m
05 Aug 2019 @ 12094m
05 Aug 2019 @ 12052m
05 Aug 2019 @ 120319h 38m
04 Aug 2019 @ 162512m
04 Aug 2019 @ 161325m
04 Aug 2019 @ 15484m
04 Aug 2019 @ 154413m
04 Aug 2019 @ 153126m
04 Aug 2019 @ 15051m
04 Aug 2019 @ 15041m
04 Aug 2019 @ 15032h 25m
04 Aug 2019 @ 123811m
04 Aug 2019 @ 12272m
04 Aug 2019 @ 122515m
04 Aug 2019 @ 121017m
04 Aug 2019 @ 11531m
04 Aug 2019 @ 11521m
04 Aug 2019 @ 11516m

Interval Statistics

Interval Count100
Min1m
Max24d 17h 17m
Mean6h 28m
Median2m

Latest Notes

Note IDStart Time (US/Mountain)End Time (US/Mountain)EntrantNote
13099 07 Aug 2019 @ 1900 07 Aug 2019 @ 1926 JSJ No activity at all from Middle Sister, but I've seen pauses much longer than this recently. No other activity in the entire Three Sister complex, except Three Crater eruptions.
13083 06 Aug 2019 @ 1505 06 Aug 2019 @ 1808 JSJ All closed intervals. Occasional blipping or roiling in lieu of an eruption. All eruptions were single brief bursts, with one double burst. One or two were ~2-3 seconds in duration.
13054 05 Aug 2019 @ 1203 05 Aug 2019 @ 1341 JSJ All closed intervals. Some roiling and blipping events. All eruptions were single short bursts of varying sizes.
13027 04 Aug 2019 @ 1027 04 Aug 2019 @ 1625 JSJ All closed intervals. Under constant observation during this time.
12384 06 Jul 2019 @ 1305 --- DanS Domed water. Did not erupt.
9091 09 Jul 2018 @ 1145 09 Jul 2018 @ 1218 Micah Kipple Occasional bubbling vent just on the south edge of the crater towards south sister.
5288 23 Aug 2017 @ 1117 23 Aug 2017 @ 1155 Tara Under observation during this time, no eruptions.
EntrySourceLinkComment
06 Aug 2019 @ 1505 JSJ https://www.youtube.com/watch?v=_iWPkqVV0Sc#t=4m02s Clips 17-37 of this video compilation (= time stamp 4:02 to the end) show Middle Sister Spring eruptions on 6 August 2019.
04 Aug 2019 @ 1027 JSJ https://www.youtube.com/watch?v=_iWPkqVV0Sc Clips 1-16 of this video compilation (= beginning to time stamp 4:01) show Middle Sister Spring eruptions on 4 August 2019.
Baseline does not exist.


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