The final month has been significantly colder than regular over the area, with japanese Washington being notably frigid. The coldest air this season will arrive on Sunday.
To place you within the correct temper, check out a plot of the distinction in our each day temperatures from regular over the previous month (see beneath). Jap Washington has been frigid, with temperatures 6-12 F beneath regular, whereas western Washington has been 2-6F beneath regular.
This distinction will get much more dramatic in the course of the coming days.
Our area will keep reasonably chilly and decidedly dry by way of Saturday.
However on Sunday afternoon by way of Monday morning, chilly air and excessive stress will push southward from British Columbia, as illustrated by the floor chart at 4 AM Monday. (beneath). The traces indicated sea stage stress and the colours present the temperature at round 2500 ft above the floor. Blue, purple, brown and white colours are chilly sufficient to snow.
Northwest Washington and japanese Washington are the coldest in our state at the moment. Insane chilly over the BC inside and east of the Rockies.
Listed here are the forecast temperatures at SeaTac Airport for the subsequent week based mostly on the NOAA/Nationwide Climate Service NBM prediction (which makes use of many fashions and information sources). Monday and Tuesday would have highs solely reaching the mid to higher 30s and lows within the 20s.
What about Jap Washington? MUCH colder. At Pasco, for instance, the temperatures will fall into the kids at night time, and single digits will likely be widespread.
What about snow?
The primary probability will likely be on Sunday because the chilly air pushes southward. Right here is the forecast for complete snowfall by way of Sunday at 4PM. Some snow within the mountains and japanese WA, however solely scattered snow in western Washington. Bellingham, the San Juans, and the northeast facet of the Olympics are the very best bets.
The snowfall from the lower-resolution European Middle mannequin (for the 24h ending 4 AM Monday) suggests the potential for a band of convergence zone snow over Puget Sound….however nothing dramatic. Some fashions had beforehand predicted a second snow occasion, however most are backing away from it.
In any case, I’ll hold an in depth watch on the snow potential. And as we get nearer, I’ll have extra highly effective instruments obtainable.
