Convergence Zone strikes again

Convergence Zone strikes again
Updated Wednesday 10:00 p.m.

What's new and now: The Convergence Zone is now sliding south into northern King County and the snow is starting to end in Everett. The Zone will continue to drop a steady snow into northern King County as it weakens. A HEAVY SNOW WARNING remains in effect until 4 a.m. for southern Snohomish County. So far, snow totals range from 4-9" with an additional 1-3" possible overnight.


The Convergence Zone strikes again -- for the second time!

Convergence zones are sort of a weather forecaster's arch enemy because they're really unpredictable, and when you involve snow, it's even worse.

For tonight, we're tossing out the original snow forecasts in deference to the second Convergence Zone of the day, which is dumping a steady snow in southern Snohomish County Wednesday evening.

Snow totals in that area ranged from 4-9" as of 8 p.m. with snow continuing to fall. Lake Stevens was the winner so far with 9", while Mukilteo had 4" and Marysville was up to 5".

A HEAVY SNOW WARNING is in effect until 4 a.m. for Everett and the rest of central and southern Snohomish County for an additional 1-3" overnight.

The Zone is expected to slowly slide south and east overnight toward Shoreline and Northern King County to perhaps as far south as Seattle/Bellevue -- looks like the Eastside will get more than Seattle as Seattle will just be on the southwestern edge of the moisture -- but the zone will weaken as it does so. Those areas will also then see some snow overnight, but we're not expecting the same snow totals that the Everett area has seen so far (maybe 1-3" total).

Outside the Zone, we're looking at random snow showers with little or no accumulation. Best chance for these showers are in the foothills above 400 feet where you could eke out an inch or two depending on the intensity of the shower, but unlike the Zone, these showers will be passing and won't stick around too long. A SNOW ADVISORY, which just means accumulating snow is possible, is in effect until 4 a.m. for the Cascade foothills and Hood Canal area.

Another concern we have for tonight is ice. Looks like temperatures are going to drop into the 20s and low 30s, so could make for a tricky morning commute, even in areas where it hasn't snowed.

The snow party first moved into the Cascade foothills during Tuesday night. We had reports of a little snow overnight in North Bend, Snoqualmie, Fall City and Preston. One viewer in Snoqualmie reported about 2" of accumulation there as well. Light accumulations were also reported from Eatonville to Morton, and on the higher hills around Quinault and Willapa. And some coastal areas also reported a dusting to an inch.

By early Wednesday morning, that Puget Sound Convergence Zone formed in northern Snohomish and southern Skagit County, proving enough oomph to kick out 1-2" of snow up there in the higher elevations.

That Zone intensified and sank south into the rest of Snohomish County and northern King County later Wednesday morning, and reports of snow were coming in from places like Everett, Mill Creek, Snohomish, Mukilteo, Shoreline, Clearview and Kenmore. Snohomish and Clearview were reporting about 3" as of 10 a.m.

DOT cameras in the area showed that the major roadways did OK, but some of the smaller roads especially east of Mill Creek and Snohomish, were having problems. DOT crews closed SR 9 at SR 96 south of Snohomish for a short time due to excessive snow.

Outside the Zone, snow showers fell in the eastern foothill areas of east King, Pierce and Snohomish Counties. Graham, Cumberland, and Black Diamond reported some light accumulations late Wednesday morning. Even Seattle saw a few snowflakes today, but it was brief and didn't stick.

Then came Wednesday evening, and a very strong shower brought a swath of hail, snow and lightning across the northern Kitsap Peninsula and then into Snohomish and Northern King County. Reports are as much as 2-3 inches of snow from this squall on Camano Island, Mukilteo, and in Stanwood, with near whiteout conditions reported in Silverlake Wednesday evening. That then transformed into a second Convergence Zone, which brought heavy snow to the Everett/south Snohomish County areas once again.

We gradually lose the moisture by Thursday morning, with just some lingering rain/snow showers early, and then drying for the midday and early afternoon hours. Highs will stay cool, but will warm a touch to the mid 40s.

Speaking of warming, that's definitely the case as we go forward. Our next storm begins to push inland on Thursday evening and night, but this is a much warmer storm. Temperatures Thursday night won't drop much, and then by Friday, we're up near 50 with a steady, moderate rain and all snow chances go away as snow levels rise to 5,000 feet.

Even a bit warmer for Saturday with rain early, tapering to showers by afternoon. Temperatures will reach the low 50s.

Just a few lingering showers for Sunday with temps into the low 50s again.

Another wet day expected Monday, and then showers linger into Tuesday. Long range forecasts shed some hope for a dry Wednesday, but we'll see.