It's already widely advertised...and in the wake of Hurricane Matthew in the Atlantic, the first significant seasonal storm is on the horizon for the Pacific Northwest. And it will be powerful...the National Weather Service comparing it to the Columbus Day Storm of 1962...and since I wasn't around back then, I had to look it up...turns out that it brought winds comparable to that of a Category 2, even Category 3, Hurricane. Well, hang on to your britches...this one will be windy (and rainy), but probably not quite as intense.
This storm will come in two waves...one Thursday, the other Saturday. Thursday looks rainier than Saturday, and Saturday looks windier than Thursday. Friday looks to have the best of both worlds.
Let's take a look...
Total Precipitable Water shows the amount of moisture you would get (in inches) if you were to take all of the water in the atmosphere during any given time and squeeze it out until it was completely dry. In most cases, anything over 2 inches is considered extremely high moisture content...and widespread heavy rains should be anticipated. So why does 2 inches of precipitable water create several more inches of rain? Because it usually has a source of moisture that continues to feed it. Just like your garden hose only holds a little bit of water inside it (i.e. it's precipitable water), it has a source to the water pipes, and if left on, can flood your garden.
In conclusion, it will be a storm that folks will remember. Panic, no...but be prepared and stay off the roads if possible, and definitely the ocean, beaches & low-lying areas. Heavy rain, high tides, and dangerously strong winds are a bad combination...likely leading to mud slides, downed trees, sinkholes, powerful sneaker waves, damaged & inoperable power lines...even structural damage.
As always, your authoritative weather source is the National Weather Service, and they are responsible for issuing any and all weather warnings, watches, and advisories, both out in the ocean and on land:
Meteorologist Dan Schreiber