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Updated: Sunday, 5:20 p.m.
An atmospheric river stalling over Western Washington today dumped mountain snow and steady rain over the region, shattering long-standing precipitation records in the lowlands. As of 5 pm, Sea-Tac airport had nearly an inch and a half of rain, far surpassing the 1974 March 15th record of 1.2" of rain. The precipitation continues for our Sunday night, so we’ll continue to add more to the buckets as our Sunday winds down.
The snow has (finally!) been heavy in the mountains, with over 6" of new snow in the last several hours at the Mt. Baker ski resort. Heavy snow will continue to pile up over the north Cascades and Olympics through Sunday night. It is also gusty–winds will top out around 40 -50 mph near some of the southern beach communities tonight, while winds in the Sound will gust between 30 and 40 mph before midnight.
Thereafter, we’ll dry out into our Monday, with just a few lingering showers alternating with the sunshine. Highs will make it back into the middle 50s by the afternoon.
Another disturbance due in on St. Patrick’s Day will bring clouds and rain to the lowlands. Snow will fall again in the Cascades, but the heavier amounts will only fall in the higher ski resorts–Snoqualmie Pass will unfortunately (unless you have to cross it) stick with mainly rain.
A relatively dry and warm spell takes over late in the week, and with just a few showers–mainly closer to the Canadian border–we’ll bump back into the 60s by Thursday and Friday.
However, the trend for wet-weather-on-the-weekends appears to want to stick around. A pair of March storms will drive through next Saturday and Sunday, so at this point, it looks like both weekend days will be wet at times.
Have a great night,
Meteorologist Shannon O’Donnell
The KOMO4 Forecast Team