From the Cliffs Public Weather Blog
Cliff Mass
A major atmospheric river event will be held tomorrow (Sunday) and Monday, with heavy precipitation sounds in the mountains and southern areas.
The latest predictions from the UW WRF model predict that the cascade reacts up to 10 inches, while the Southern Western Australia Cascade hits the hardest (see below). By contrast, the deep rain shadow will extend from the Northeast Olympics to Bellingham.
It is now obvious that there will be severe flooding in some places. For example, NOAA/NWS River forecast center is predicting major floods on the Snoqualmie River near Carnation.
Want to see something spectacular? Go to Snoqualmie Falls on Monday. If you can get there.
Atmospheric rivers in our region are associated with warm, humid air in the south, southwest and west.
NOAA The weather satellite can sense water vapor, which is very evident in the water vapor image this morning (below). A large amount of water vapor is moving.
Like the UW WRF model, numerical weather prediction models can cleverly predict this water vapor plume, releasing large amounts of water as the air is forced to pass through the massive terrain of our region.
Meteorologists' favorite atmospheric river diagnosis is Integrated water vapor transport (IVT)this is the wind speed of the water vapor, which is vertically in the vertical direction (this is the source of the comprehensive). This quantity is closely related to the potential of regional rainfall.
The predictions for Sunday morning IVT are shown below, and the arrows show the direction and magnitude of the large amount of values of moisture transfer, but will not break the record anyway.
Such moisture feathers are usually very warm as well. In fact, to obtain greater value, they must remain warm because the amount of moisture can be maintained depends on the temperature (warm air may keep more water vapor than cold air).
Atmospheric river formation in our area When strong southwestern atmospheric wind currents appear, a large amount of water vapor is removed from the subtropical zone.
The atmospheric flow pattern that does this is usually characterized by strong low pressure areas of the Gulf of Alaska and western Southern California.
Not surprisingly, this is exactly the 10 a.m. pattern forecast on Sunday, with a level of about 5,000 feet (below). Due to the high and low pressures to the south, strong pressure/height changes are generated, resulting in strong southwest flow.
What’s interesting about atmospheric rivers is that they are like ordinary rivers… Not only does the water enter the river at the beginning, but there is a fusion of water vapor along the way, which is no different from a stream and flowing into the river throughout the path.
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