ADVISORY: High Tides May Lead To Minor Flooding Tues./Wed.


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The National Weather Service issued an unusual Advisory Monday (Jan. 18th) – this one for a “minor tidal overflow” that will be in effect for Puget Sound Tuesday morning and possibly again Wednesday morning.

According to the report, “very high astronomical tides combined with lower than normal atmospheric pressures” as well as high winds may cause some flooding.

So, if you live near the shoreline and your street/yard/area has a tendency to flood, you might want to put out some sandbags just in case.

Here’s the actual advisory:

… Coastal Flood Advisory for minor tidal overflow is in effect for Puget Sound and the north interior from 5 am to 11 am PST Tuesday…

The National Weather Service in Seattle has issued a coastal Flood Advisory for minor tidal overflow from Puget Sound to the north interior… which is in effect from 5 am to 11 am PST Tuesday.

Minor tidal overflow may occur along some of the shorelines and nearby low-lying areas around Puget Sound and the north interior Tuesday morning… around the time of high tide. Minor tidal overflow is caused by very high astronomical tides combined with lower than normal atmospheric pressures. The Table below shows time of high tide for areas around Puget Sound… along with the normal tide table value and the expected total tide.

Time of tide table expected expected location high tide value anomaly total tide

  • Seattle 7:30 am 12.2 ft 1.6 ft 13.8 ft
  • Port Townsend 7:06 am 9.1 ft 1.8 ft 10.9 ft
  • Bellingham 8:12 am 9.6 ft 1.9 ft 11.5 ft

Minor tidal overflow problems usually begin at 13.5 feet around Seattle and 11.5 feet around Bellingham… and the current forecasts for those areas just meet or exceed those levels. In addition… the atmospheric pressure could be a little lower than forecast… and local winds may cause water to pile up along shorelines more than expected… possibly higher than the expected total tide values. Southeast winds 20 to 30 knots are forecast over the northern inland waters Tuesday morning as another deep low pressure system moves northward offshore. Winds over the waters of Puget Sound are expected to be south 10 to 20 knots Tuesday morning.

Another very high astronomical tide will occur Wednesday morning. The forecast tides for Wednesday morning are slightly lower than for Tuesday… but computer model forecasts indicate the anomaly will still be large enough so that minor tidal overflow problems remain a possibility.

Precautionary/preparedness actions…

Minor tidal over flow can cause local flooding along shorelines and nearby low-lying areas.

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