Spills · oil

Mendenhall glacier flood outburst 2026; juneau, alaska

NOAAORR-11198

issued: 2026-08-11 00:00Z
status: cancelled 2026-08-25 00:00Z
self-cancels: 2026-08-25 00:00Z
authority: NOAA OR&R
sea: The Coastal Waters of Southeast Alaska and British Columbia
position: 58.496, -134.532
source: incidentnews · first seen 2026-09-03 15:09Z

Original warning text

Mendenhall Glacier Flood Outburst 2026; Juneau, Alaska.
Juneau, AK, USA.
1. A glacial lake outburst has occurred at Suicide Basin on the Mendenhall Glacier. The basin is releasing. Flooding is expected along Mendenhall Lake and River late Wednesday evening into early Thursday morning. A crest between 16.1 and 16.6 ft in Major Flood Stage is expected between 5 am and 9 am Thursday, 8/13/2026. People living in the potential inundation area (~1,900 residences) are advised to evacuate today (8/12/2026). No NOAA facilities are located in the evacuation area. Previous to this event, the U.S. Coast Guard requested guidance on the fate and trajectory of a worst case discharge of the fuel storage tanks in the inundation zone.
2. THREAT: OIL.
3. POSITION 58.496N 134.532W. NOAA INCIDENTNEWS 11198: https://incidentnews.noaa.gov/incident/11198

This area · spills & pollution incidents

92 within 180 nm since 1986 · 6 in the last 12 months · 0 in force now

On july 23, 2026, the U.S2026-07-23
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On 9/24/25, the U.S2025-09-24
2025 mendenhall glacier flood event; juneau, alaska2025-08-12

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