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SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE JUNEAU AK
736 AM AKDT MON AUG 11 2025
AKZ325-120345-
CITY AND BOROUGH OF JUNEAU-
INCLUDING THE CITY OF JUNEAU
736 AM AKDT MON AUG 11 2025
..SIGNS OF OVERTOPPING AT SUICIDE BASIN
AS OF 7:30 AM MONDAY, THE USGS WEB CAMERA AND LASER GAGE IN
SUICIDE BASIN CONTINUE 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.
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