Marine forecast
Sumner Strait, AK
- current wind
- 10 kt NE
- Gusts
- 18 kt
- Air
- 48°F
- 72-hr peak
- 18 kt
- Peak seas
- 4 ft
Observed Tue 10:22 AM | PKZ035
- Gusts now
- 18 kt
- Air
- 48°F
- 72-hr peak
- 18 kt
- Peak seas
- 4 ft
In brief
At 10:22 am AKDT on Oct 13, 2026, NDBC station CDEA2 (Cape Decision, AK, 38 miles away) measured wind from the NE at 10 kt, gusting to 18 kt. The NWS forecast for Sumner Strait, AK issued at 3:42 am AKDT on Oct 13, 2026 reads, for today: “Light winds becoming N 10 kt in the afternoon. Seas 2 ft or less, except 4 ft near ocean entrances.” A Small Craft Advisory is in effect until Fri 1:00 AM.
Source: National Weather Service Juneau AK forecast; NDBC observations
Wind forecast · ktPeak 18 kt
Seas forecast · ftPeak 4 ft
Marine advisory
Small Craft Advisory in effect for Sumner Strait until Fri 1:00 AM.
Full text of this small craft advisory
* WHAT...Southeast winds 20 to 30 kt with gusts up to 45 kt and seas 7 to 12 ft expected. * WHERE...Sumner Strait. * WHEN...From 4 AM Thursday to 1 AM AKDT Friday. * IMPACTS...Conditions will be hazardous to small craft.
NWS marine forecast
| Period | Forecast |
|---|---|
| Today | Light winds becoming N 10 kt in the afternoon. Seas 2 ft or less, except 4 ft near ocean entrances. Patchy fog early in the morning. |
| Tonight | NW wind 10 kt in the evening becoming light. Seas 2 ft or less, except 4 ft near ocean entrances. |
| Wed | E wind 10 kt in the morning becoming light. Seas 2 ft or less, except 4 ft near ocean entrances. |
| Wed Night | E wind 25 kt. Gusts to 40 kt. Seas 5 ft. Rain. |
| Thu | E wind 25 kt. Seas 6 ft. |
| Fri | SE wind 20 kt. Seas 5 ft. |
| Sat | SE wind 15 kt. Seas 4 ft. |
Issued Tue 3:42 AM by Juneau AK (product CWFAJK).
Recent buoy conditions
| Time | Wind | Gust | Seas | Water |
|---|---|---|---|---|
| Tue 10:22 AM | 10 kt NE | 18 kt | — | — |
| Tue 9:22 AM | 11 kt NE | 17 kt | — | — |
| Tue 8:22 AM | 11 kt ENE | 16 kt | — | — |
| Tue 7:22 AM | 10 kt ENE | 22 kt | — | — |
| Tue 6:22 AM | 10 kt NE | 17 kt | — | — |
| Tue 5:22 AM | 7 kt NE | 15 kt | — | — |
| Tue 4:22 AM | 9 kt NE | 14 kt | — | — |
| Tue 3:22 AM | 7 kt NE | 12 kt | — | — |
| Tue 2:22 AM | 7 kt NE | 13 kt | — | — |
| Tue 1:22 AM | 8 kt ENE | 13 kt | — | — |
| Tue 12:22 AM | 6 kt ENE | 12 kt | — | — |
| Mon 11:22 PM | 8 kt ENE | 12 kt | — | — |
Observed Tue 10:22 AM at NDBC buoy CDEA2 (Cape Decision, AK), 38.2 miles away.
Frequently asked questions
What is the marine forecast for Sumner Strait today?
Today: Light winds becoming N 10 kt in the afternoon. Seas 2 ft or less, except 4 ft near ocean entrances. Patchy fog early in the morning.
Is there a small craft advisory for Sumner Strait?
Yes — small craft advisory in effect until Fri 1:00 AM.
What do the wind speeds in knots mean?
One knot is 1.15 mph. The National Weather Service issues a small craft advisory for sustained winds of roughly 22–33 knots or hazardous seas, a gale warning at 34–47 knots, and a storm warning at 48 knots and above. Exact advisory thresholds vary by forecast office and by water body — a bay reaches dangerous chop at a lower wind speed than open ocean.
Where does this forecast come from?
The forecast text is the National Weather Service's own marine bulletin for zone PKZ035, issued by Juneau AK, reproduced in full. The wind and seas charts are drawn from the NWS gridded forecast for a point inside the zone. Observations come from the nearest reporting NDBC buoy. We are not affiliated with NOAA or the National Weather Service.
Forecast: NOAA/NWS product CWFAJK, issued Tue 3:42 AM. Observations: NOAA National Data Buoy Center station CDEA2, read Tue 10:22 AM. Retrieved Oct 13, 11:42 AM. Conditions offshore change faster than any page can be rebuilt, so check the current NWS bulletin and your own instruments before going out.