NOAA station 9458519, Alaska
Chowiet Island, Semidi Island tide chart
Saturday, October 31Alaska Daylight Time
NOAA harmonic station (NOAA’s page for this station, opens in a new tab)Rising, about 3.7 ft now
As of 4:15 AM AKDT
- Next
- High 7.1 ft at 7:16 AMin 3h 1m
- Then
- Low 4.2 ft at 12:11 PMin 7h 56m
Low, passed
12:29 AM
-1.0 ft
- Next
High
7:16 AM
7.1 ft
Low
12:11 PM
4.2 ft
High
6:16 PM
9.1 ft
The week ahead
This week’s tides at Chowiet Island, Semidi Island
Every high and low for the next seven days, in feet above MLLW. The 30-day table below has the rest of the month.
| Day | Tide curve | Highs | Lows | Range |
|---|---|---|---|---|
| Sat, Oct 31Range 10.1 ft | 7:16 AM 7.1 ft6:16 PM 9.1 ft | 12:29 AM -1.0 ft12:11 PM 4.2 ft | 10.1 ft | |
| Sun, Nov 1Range 8.3 ft | 7:28 AM 6.9 ft6:30 PM 8.1 ft | 1:32 AM -0.2 ft12:32 PM 4.5 ft | 8.3 ft | |
| Mon, Nov 2Range 6.9 ft | 8:40 AM 7.1 ft8:01 PM 7.5 ft | 1:46 AM 0.6 ft2:21 PM 4.3 ft | 6.9 ft | |
| Tue, Nov 3Range 6.5 ft | 9:43 AM 7.6 ft9:31 PM 7.2 ft | 3:01 AM 1.1 ft3:56 PM 3.4 ft | 6.5 ft | |
| Wed, Nov 4Range 6.7 ft | 10:34 AM 8.2 ft10:50 PM 7.3 ft | 4:06 AM 1.5 ft5:03 PM 2.2 ft | 6.7 ft | |
| Thu, Nov 5Range 7.7 ft | 11:16 AM 8.8 ft11:54 PM 7.6 ft | 5:01 AM 1.8 ft5:54 PM 1.1 ft | 7.7 ft | |
| Fri, Nov 6Range 9.2 ft | 11:54 AM 9.3 ft | 5:47 AM 2.1 ft6:36 PM 0.1 ft | 9.2 ft |
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Chowiet Island, Semidi Island tide table for the next 30 days
Every high and low for the next month, with the daily tidal range.
| Day | Highs | Lows | Range |
|---|---|---|---|
| Sat, Oct 31Range 10.1 ft | 7:16 AM 7.1 ft6:16 PM 9.1 ft | 12:29 AM -1.0 ft12:11 PM 4.2 ft | 10.1 ft |
| Sun, Nov 1Range 8.3 ft | 7:28 AM 6.9 ft6:30 PM 8.1 ft | 1:32 AM -0.2 ft12:32 PM 4.5 ft | 8.3 ft |
| Mon, Nov 2Range 6.9 ft | 8:40 AM 7.1 ft8:01 PM 7.5 ft | 1:46 AM 0.6 ft2:21 PM 4.3 ft | 6.9 ft |
| Tue, Nov 3Range 6.5 ft | 9:43 AM 7.6 ft9:31 PM 7.2 ft | 3:01 AM 1.1 ft3:56 PM 3.4 ft | 6.5 ft |
| Wed, Nov 4Range 6.7 ft | 10:34 AM 8.2 ft10:50 PM 7.3 ft | 4:06 AM 1.5 ft5:03 PM 2.2 ft | 6.7 ft |
| Thu, Nov 5Range 7.7 ft | 11:16 AM 8.8 ft11:54 PM 7.6 ft | 5:01 AM 1.8 ft5:54 PM 1.1 ft | 7.7 ft |
| Fri, Nov 6Range 9.2 ft | 11:54 AM 9.3 ft | 5:47 AM 2.1 ft6:36 PM 0.1 ft | 9.2 ft |
| Sat, Nov 7Range 10.3 ft | 12:46 AM 7.8 ft12:28 PM 9.7 ft | 6:27 AM 2.4 ft7:13 PM -0.6 ft | 10.3 ft |
| Sun, Nov 8Range 10.9 ft | 1:30 AM 8.0 ft1:00 PM 9.9 ft | 7:02 AM 2.7 ft7:49 PM -1.0 ft | 10.9 ft |
| Mon, Nov 9Range 11.0 ft | 2:09 AM 8.1 ft1:32 PM 9.9 ft | 7:36 AM 3.0 ft8:23 PM -1.1 ft | 11.0 ft |
| Tue, Nov 10Range 10.9 ft | 2:47 AM 8.0 ft2:03 PM 9.8 ft | 8:09 AM 3.3 ft8:57 PM -1.1 ft | 10.9 ft |
| Wed, Nov 11Range 10.4 ft | 3:25 AM 7.8 ft2:35 PM 9.6 ft | 8:40 AM 3.6 ft9:32 PM -0.8 ft | 10.4 ft |
| Thu, Nov 12Range 9.7 ft | 4:04 AM 7.5 ft3:07 PM 9.3 ft | 9:12 AM 3.9 ft10:08 PM -0.4 ft | 9.7 ft |
| Fri, Nov 13Range 8.8 ft | 4:45 AM 7.2 ft3:40 PM 8.8 ft | 9:45 AM 4.2 ft10:46 PM 0.0 ft | 8.8 ft |
Show days 15 to 30Hide days 15 to 30 | |||
| Sat, Nov 14Range 7.7 ft | 5:31 AM 6.9 ft4:17 PM 8.3 ft | 10:21 AM 4.5 ft11:27 PM 0.6 ft | 7.7 ft |
| Sun, Nov 15Range 3.0 ft | 6:22 AM 6.6 ft5:00 PM 7.7 ft | 11:08 AM 4.7 ft | 3.0 ft |
| Mon, Nov 16Range 6.0 ft | 7:19 AM 6.6 ft6:00 PM 7.1 ft | 12:14 AM 1.1 ft12:16 PM 4.8 ft | 6.0 ft |
| Tue, Nov 17Range 5.2 ft | 8:15 AM 6.8 ft7:23 PM 6.5 ft | 1:08 AM 1.6 ft1:54 PM 4.6 ft | 5.2 ft |
| Wed, Nov 18Range 5.2 ft | 9:05 AM 7.2 ft8:50 PM 6.4 ft | 2:09 AM 2.0 ft3:21 PM 3.9 ft | 5.2 ft |
| Thu, Nov 19Range 5.4 ft | 9:48 AM 7.8 ft10:08 PM 6.5 ft | 3:09 AM 2.4 ft4:22 PM 2.8 ft | 5.4 ft |
| Fri, Nov 20Range 6.9 ft | 10:28 AM 8.4 ft11:15 PM 6.9 ft | 4:03 AM 2.6 ft5:11 PM 1.5 ft | 6.9 ft |
| Sat, Nov 21Range 8.9 ft | 11:06 AM 9.1 ft | 4:52 AM 2.8 ft5:54 PM 0.2 ft | 8.9 ft |
| Sun, Nov 22Range 10.7 ft | 12:12 AM 7.5 ft11:45 AM 9.8 ft | 5:37 AM 2.9 ft6:37 PM -0.9 ft | 10.7 ft |
| Mon, Nov 23Range 12.3 ft | 1:02 AM 7.9 ft12:25 PM 10.4 ft | 6:21 AM 3.0 ft7:20 PM -1.9 ft | 12.3 ft |
| Tue, Nov 24Range 13.4 ft | 1:50 AM 8.2 ft1:05 PM 10.9 ft | 7:03 AM 3.2 ft8:04 PM -2.5 ft | 13.4 ft |
| Wed, Nov 25Range 13.8 ft | 2:37 AM 8.3 ft1:48 PM 11.1 ft | 7:47 AM 3.3 ft8:50 PM -2.7 ft | 13.8 ft |
| Thu, Nov 26Range 13.6 ft | 3:25 AM 8.3 ft2:33 PM 11.1 ft | 8:33 AM 3.4 ft9:38 PM -2.5 ft | 13.6 ft |
| Fri, Nov 27Range 12.7 ft | 4:15 AM 8.1 ft3:22 PM 10.7 ft | 9:22 AM 3.5 ft10:27 PM -2.0 ft | 12.7 ft |
| Sat, Nov 28Range 11.1 ft | 5:07 AM 7.9 ft4:15 PM 9.9 ft | 10:18 AM 3.7 ft11:18 PM -1.2 ft | 11.1 ft |
| Sun, Nov 29Range 5.1 ft | 6:02 AM 7.8 ft5:14 PM 8.9 ft | 11:21 AM 3.8 ft | 5.1 ft |
Conditions at Chowiet Island, Semidi Island
From the National Weather Service forecast for this spot, with today's sunrise and sunset.
Any date, past or future
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About Chowiet Island, Semidi Island tides
Chowiet Island, Semidi Island is a NOAA harmonic tide station (9458519): its predictions come from the tidal constituents NOAA derived from water levels measured at this spot. Heights are in feet above MLLW (Mean Lower Low Water), the datum of US nautical charts, so they line up with charted depths.
In the next 30 days, Chowiet Island, Semidi Island has two highs and two lows on 26 days and three turns on 4 days, and the daily range runs from 3.0 to 13.8 ft. That is a mixed tide: two highs and two lows on most days, of clearly different heights.
Use the curve above to time a harbor entrance, a beach walk, fishing a moving tide or clearing a shallow bar, and remember that wind, air pressure and river flow can push the real water level above or below the prediction. The daily tidal range in the tables shows how much water moves each day: bigger ranges around the new and full moon mean stronger currents.
Frequently asked
What time is high tide in Chowiet Island, Semidi Island today?+
Today (Saturday, October 31), high tide at Chowiet Island, Semidi Island is at 7:16 AM (7.1 ft), 6:16 PM (9.1 ft). Heights are referenced to MLLW (Mean Lower Low Water).
What time is low tide in Chowiet Island, Semidi Island today?+
Today, low tide at Chowiet Island, Semidi Island is at 12:29 AM (-1.0 ft), 12:11 PM (4.2 ft).
What tidal datum do these Chowiet Island, Semidi Island tide heights use?+
All heights are given in feet relative to MLLW (Mean Lower Low Water), the standard NOAA chart datum for US tidal waters. A tide of 0.0 ft equals the chart datum; negative tides fall below it.
How accurate are these tide predictions?+
Chowiet Island, Semidi Island is a NOAA harmonic station (9458519), so these are NOAA's harmonic predictions for this spot, which are very accurate for the astronomical tide. Real water levels can still differ with wind, air pressure and river flow, so check conditions before you get underway.
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