WEATHER: Weather Service says good chance of snow; Alaska cancels flights


NOTE: Our Puget Sound Weather Geek is currently in Arizona, but we managed to cobble this update together for him:


Live Image from Three Tree Point (viewable during daytime only): 

Click image to see larger version.

The National Weather Service on Sunday (Dec. 4) issued both a Winter Weather Advisory and Winter Storm Watch, warning of “snow showers down to sea-level through late Monday night,” starting Monday.

The Weather Service’s forecast for Monday calls for a 70% chance of snow:

“Snow showers likely. Mostly cloudy, with a low around 28. Calm wind becoming north around 5 mph in the evening. Chance of precipitation is 70%. New snow accumulation of around an inch possible.” 

In addition, Alaska Airlines has preemptively cancelled 20 flights Monday morning in preparation for wintry weather:

“The National Weather Service reports cold weather is moving in and with that light snow is forecasted in the lowlands,” Alaska said on its blog. “The nearly 1,300 passengers affected will automatically be rebooked onto later flights, and are urged to check the status of their flights on alaskaair.com before heading to the airport.”

Meteorologist Cliff Mass adds:

“Roughly 75% of the model runs are predicting an inch or two at Seattle-Tacoma Airport (452 ft). The temperatures on Monday are colder than we have had, but they are still on the margin near sea level and the water. So expect a substantial gradient with elevation (more on the hills).”

ww_msnow24-72-0000

Of this image for Tuesday morning, Dec. 6 (the blue indicates snowfall), Cliff Mass says: “The Puget Sound area gets a half to a few inches, with north Seattle to Everett getting more than the south Sound. Less near the water.”

As with most weather in the Northwest, it often snows more north of the city in the “convergence zone,” and as we all know, predicting the weather is never certain.

Here’s the Weather Service forecast for the next seven days:

  • Sunday night: A chance of rain and snow showers. Mostly cloudy, with a steady temperature around 39. South wind 7 to 9 mph. Chance of precipitation is 50%. Little or no snow accumulation expected.
  • Monday: Rain and snow showers. High near 40. South wind 9 to 14 mph. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.
  • Monday Night: Snow showers likely. Mostly cloudy, with a low around 28. Calm wind becoming north around 5 mph in the evening. Chance of precipitation is 70%. New snow accumulation of around an inch possible.
  • Tuesday: Mostly sunny, with a high near 37. Calm wind becoming north 5 to 9 mph in the morning.
  • Tuesday Night: Partly cloudy, with a low around 26. North northeast wind around 7 mph becoming east in the evening.
  • Wednesday: Mostly sunny, with a high near 40.
  • Wednesday Night: Snow likely, mainly after 4am. Mostly cloudy, with a low around 30. Breezy. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
  • Thursday: Rain and snow likely, becoming all rain after 10am. Cloudy, with a high near 41.
  • Thursday Night: Rain likely. Cloudy, with a low around 37. Breezy.
  • Friday: Rain likely. Cloudy, with a high near 45.
  • Friday Night: A chance of showers. Cloudy, with a low around 41.
  • Saturday: A chance of showers. Cloudy, with a high near 46.
  • Saturday Night: A chance of showers. Mostly cloudy, with a low around 38.
  • Sunday: A chance of showers. Mostly cloudy, with a high near 40.

And here’s the Winter Weather Advisory:

…WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 4 AM TO NOON PST MONDAY…
…WINTER STORM WATCH IN EFFECT FROM MONDAY AFTERNOON THROUGH LATE MONDAY NIGHT…

THE NATIONAL WEATHER SERVICE IN SEATTLE HAS ISSUED A WINTER STORM WATCH…WHICH IS IN EFFECT FROM MONDAY AFTERNOON THROUGH LATE MONDAY NIGHT.

* TIMING…SHOWERS WILL INCREASE MONDAY MORNING BETWEEN 4 AM AND NOON. SLIGHTLY WARMER TEMPERATURES WILL BRING MOSTLY RAIN SHOWERS BY AFTERNOON. COLDER AIR ARRIVES MONDAY EVENING WITH A PUGET SOUND CONVERGENCE ZONE PRODUCING SNOW SHOWERS DOWN TO SEA-LEVEL THROUGH LATE MONDAY NIGHT.

* SNOW AMOUNTS…A TRACE TO 2 INCHES ABOVE 500 FEET MONDAY MORNING. MONDAY NIGHT…LOCALLY UP TO 4 INCHES OF ADDITIONAL SNOW POSSIBLE FROM NORTH SEATTLE TO EVERETT AND EASTWARD TO THE FOOTHILLS INCLUDING THE BELLEVUE AREA. LITTLE OR NO SNOW ACCUMULATION ELSEWHERE AROUND THE METRO REGION NOT AFFECTED BY THE CONVERGENCE ZONE.

* SNOW LEVELS…MAINLY NEAR 500 FEET MONDAY MORNING…RISING IN THE AFTERNOON. SNOW LEVELS FALLING TO SEA-LEVEL MONDAY EVENING THROUGH LATE MONDAY NIGHT AS COLD NORTHERLY FRASER OUTFLOW DEVELOPS.

* IMPACTS…SLUSH ON SOME ROADWAYS ABOVE 500 FEET MAY CAUSE SLIPPERY DRIVING CONDITIONS MONDAY MORNING. TEMPERATURES FALLING INTO THE UPPER 20S MONDAY NIGHT WILL CAUSE ANY SNOW OR RECENT MOISTURE TO BECOME ICY DURING THE COMMUTES.

PRECAUTIONARY/PREPAREDNESS ACTIONS…

A WINTER WEATHER ADVISORY FOR SNOW MEANS THAT PERIODS OF SNOW COULD CAUSE TRAVEL DIFFICULTIES. USE CAUTION WHILE DRIVING.

A WINTER STORM WATCH MEANS THERE IS A POTENTIAL FOR SIGNIFICANT SNOW…SLEET…OR ICE ACCUMULATIONS THAT MAY IMPACT TRAVEL. CONTINUE TO MONITOR THE LATEST FORECASTS.

One good way to monitor the weather is by watching our Webcam Page – here are a few choice images:

Highline College’s MaST Center Webcam:

Highline College Student Union Building 8:

Des Moines Traffic Cameras:


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