557  
WWAK87 PAJK 120540  
SPSAJK  
 
SPECIAL WEATHER STATEMENT  
NATIONAL WEATHER SERVICE JUNEAU AK  
940 PM AKDT MON AUG 11 2025  
 
AKZ325-121800-  
CITY AND BOROUGH OF JUNEAU-  
940 PM AKDT MON AUG 11 2025  
   
.SUICIDE BASIN IS OVERTOPPING  
 
AS OF 10:00 PM 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 SLOW LOWERING OF WATER LEVELS. THIS MEANS THE BASIN IS AT FULL  
CAPACITY AND IN THE PAST IT HAS TAKEN UP TO 6 DAYS FROM THE START OF  
OVER-TOPPING, SUNDAY AUGUST 10TH, 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 10 AM MONDAY OR SOONER AS NEEDED.  
VISIT WEATHER.GOV/JUNEAU/SUICIDEBASIN FOR MORE INFORMATION.  
 
 
 
ERIN.BRUNSEN  
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