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They are estimating 1-2.5ft waves on the Oregon coast. SO not as much as a decent storm.
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It looks more like a swelling of tides, not just one big wave. One report said Hawaii had seen some waves 3' high at 2:30am HST today. Hopefully she is doing well!
local news says "sunami" to arrive about 8:30 expect 1 - 3 ft. waves. maybe slightly larger. run for your lives!
They are estimating 1-2.5ft waves on the Oregon coast. SO not as much as a decent storm.
It is not the height of the wave that matters in a tsunami. It is the amount of water behind it (wave length) it and how far inland it travels. They don't always stop on the beach like normal ocean waves. The farther inland it travels, particularly in populated areas, the more debris it tends to carry out to sea when the wave recedes. Then subsequent waves are a churning mass of water and debris which are particularly dangerous to anyone trapped in the water.Seaside reports 2 to 3 foot waves!
Off shore bottom structures also effect both wave height and volume, greatly effecting the results! In Japan, the measured hight was far more then anything ever seen, but it's total volume didn't match the first three waves, it was only after the last of the waves hit that the flood followed! Some areas had humongous waves, but little volume, and other areas saw massive flooding with out the yuge waves!It is not the height of the wave that matters in a tsunami. It is the amount of water behind it (wave length) it and how far inland it travels. They don't always stop on the beach like normal ocean waves. The farther inland it travels, particularly in populated areas, the more debris it tends to carry out to sea when the wave recedes. Then subsequent waves are a churning mass of water and debris which are particularly dangerous to anyone trapped in the water.
"Tsunamis have a small wave height offshore, and a very long wavelength (often hundreds of kilometres long, whereas normal ocean waves have a wavelength of only 30 or 40 metres),[34]which is why they generally pass unnoticed at sea, forming only a slight swell usually about 300 millimetres (12 in) above the normal sea surface. They grow in height when they reach shallower water, in a wave shoaling process described below. A tsunami can occur in any tidal state and even at low tide can still inundate coastal areas." from wikipedia.
Here is a good video from Japan showing how a very small in height wave becomes particularly destructive as the massive amount of water gets channeled up a river estuary.
DAMN! That at the start seemed like nothing but after a while was amazing to see how bad it gets.It is not the height of the wave that matters in a tsunami. It is the amount of water behind it (wave length) it and how far inland it travels. They don't always stop on the beach like normal ocean waves. The farther inland it travels, particularly in populated areas, the more debris it tends to carry out to sea when the wave recedes. Then subsequent waves are a churning mass of water and debris which are particularly dangerous to anyone trapped in the water.
"Tsunamis have a small wave height offshore, and a very long wavelength (often hundreds of kilometres long, whereas normal ocean waves have a wavelength of only 30 or 40 metres),[34]which is why they generally pass unnoticed at sea, forming only a slight swell usually about 300 millimetres (12 in) above the normal sea surface. They grow in height when they reach shallower water, in a wave shoaling process described below. A tsunami can occur in any tidal state and even at low tide can still inundate coastal areas." from wikipedia.
Here is a good video from Japan showing how a very small in height wave becomes particularly destructive as the massive amount of water gets channeled up a river estuary.
Posted in other thread, repeated here.In Hawaii, the Pacific Tsunami Warning Center reported waves slamming ashore
from half a meter (a foot) in Nawiliwili, Kauai, to 80 centimeters (2.7 feet) in Hanalei.
Wow, a whole foot tall wave.
But it did slam ashore so..................
Could you imagine something like that ripping up the Columbia and Willamette rivers, wiping out all the river communities plus a good portion of low level Portland.It is not the height of the wave that matters in a tsunami. It is the amount of water behind it (wave length) it and how far inland it travels. They don't always stop on the beach like normal ocean waves.
Here is a good video from Japan showing how a very small in height wave becomes particularly destructive as the massive amount of water gets channeled up a river estuary.