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Hydrologic Outlook
National Weather Service Juneau AK
707 PM AKDT Sun Aug 10 2025


...SIGNS OF OVERTOPPING AT SUICIDE BASIN...

As of 6:50 PM the USGS web camera and laser gage in Suicide Basin
have started to show indications of over-topping the ice dam with
icebergs being pulled towards the overflow channel and very little
new water rise. This means the basin is at full capacity and in the
past it has taken up to 6 days for the outburst flooding event to
begin.

The water level in the basin will slowly fall as the overflow
channel erodes. A faster drop in water levels in the basin along
with a rise on Mendenhall Lake will indicate a sub-glacier release
and our office will issue a Flood Warning. From that point, the
outburst flooding event would take about 48 hours to peak.

Now is the time to finish up the flood preparation/planning and get
those plans "SET" so they can be put into action, and "GO" when a
Flood Warning is issued. Check back regularly for updates on this
evolving situation.

This product will be updated by 7 AM Monday or sooner as needed.

$$

erin.brunsen