Note: My subsequent weblog will likely be on the sudden stratospheric warming over the Arctic and the implications for the long-term climate forecast. Major modifications within the massive scale climate circulation within the providing!
As promised, a potent atmospheric river has hit our area, with very heavy precipitation on the upwind (windward) sides of regional terrain.
Let be start by displaying you a satellite-based view of complete atmospheric moisture from late yesterday. Purple and pink are the best quantities. Satellites can sense water vapor content material based mostly on the emission of radiation by water vapor.
You can see the plume of moisture heading into us from the southwest. Amazingly, our moisture plume may be traced again 1000’s of miles to the western Pacific close to the Philippines and Indonesia: the area of the warmest water on the planet, generally known as the nice and cozy pool.
The map beneath exhibits the precipitation for the previous 24 h (ending eight AM). Some areas on the south and southwest facet of the Olympics have gotten 5-6 inches thus far, as have some rain gauges within the mountains of SW Washington. Around Seattle about 1.5 inches have fallen, whereas only some tenths of an inch have moist the bottom over northern Whidbey Island within the rain shadow. Seattle already has had 5.12 inches this month and by the top of the day we are going to attain the everyday month-to-month complete (5.57 inches). A complete month’s rain in lower than half a month!
Weather radars can be utilized as remotely sensing rain gauges by making some assumptions. Here is the “storm complete” for the previous two days from the Camano Island radar. You can see the profound rainshadow to the northeast of the Olympics, with a few tenth of an inch at its core. But 3-5 inches not far-off west of the Hood Canal.
Several of you’ve got emailed me, asking in regards to the present degree of our reservoirs. As of yesterday, Seattle’s water provide was in good condition (see beneath), with above-normal cumulative precipitation, above regular snowpack, and far above regular water storage. Today will present a considerable water addition.
But what in regards to the drought-sensitive Yakima River Reservoir System, so crucial for agriculture within the east? (see beneath). Currently above regular and WAY above final 12 months.
And Washington State’s snowpack is in good condition, as proven beneath and famous in earlier blogs, and Oregon is simply barely beneath regular.
The backside line: water sources and snowpack are in good condition for our area at this level, one thing not shocking for a La Nina Year.
Many of you’re asking about chilly and snow within the lowlands. I’ll discuss this in future blogs, however the newest forecasts are projecting a flip to radically cooler situations by the top of the month. As a teaser, right here is the anticipated 7-day snowfall ending January 29th. Yes, lowland snow. But do not get too excited but…. forecast ability is marginal that far out. Seattle and different municipalities ought to be sure the plows and salt provides are in good order.