UPDATE at 10:30 pm

The National Weather Service has changed their forecast and now snow no longer looks likely in the lowland areas of Seattle in the next 24 hours. Here's
their updated forecast:

"Overnight: Rain, mainly after 4am. Low around 38. South southwest wind between 10 and 13 mph. Chance of precipitation is 80%.

Monday: Showers. High near 47. Southwest wind 9 to 16 mph becoming north. Chance of precipitation is 90%.

Monday Night: Rain showers likely before 10pm, then a chance of rain and snow showers. Snow level 1200 feet lowering to 500 feet. Mostly cloudy, with a low around 33. East southeast wind 5 to 7 mph becoming west. Chance of precipitation is 70%. Little or no snow accumulation expected.

Tuesday: A chance of rain and snow showers before 10am. Snow level 500 feet. Partly sunny, with a high near 45. North northwest wind around 11 mph. Chance of precipitation is 30%. Little or no snow accumulation expected.

Original post
Spring gets here on March 20 but winter is still with us and snow levels are likely to drop to 600 feet tomorrow as a cold front comes over the area. The National Wesather Service has issued a special weather statement in advance of the event.

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SEATTLE WA
144 PM PST SUN MAR 4 2012

144 PM PST SUN MAR 4 2012

...A STRONG COLD FRONT WILL SWEEP THROUGH WESTERN WASHINGTON LATE
TONIGHT AND MONDAY WITH LOW SNOW LEVELS AND LOCAL ACCUMULATIONS
NEAR SEA-LEVEL POSSIBLE...

A COLD FRONT WILL MOVE THROUGH WESTERN WASHINGTON MONDAY MORNING.
THE MAJORITY OF PRECIPITATION WITH THE FRONT WILL LIKELY FALL AS RAIN ACROSS THE LOWLANDS...BUT THERE IS A CHANCE THAT A CHANGE OVER TO WET SNOW COULD OCCUR DURING THE MORNING HOURS. SOME COMPUTER MODELS SUGGEST A SLUSHY 1-3 INCHES OF SNOW COULD ACCUMULATE QUICKLY...MAINLY EAST OF DOWNTOWN SEATTLE AND FROM NORTH SEATTLE ALONG THE I-5 CORRIDOR TO BELLINGHAM. AREAS ALONG THE NORTH COAST...EASTERN STRAIT OF JUAN DE FUCA...AND OVER THE SAN JUAN ISLANDS COULD ALSO SEE SIMILAR ACCUMULATIONS. DETAILS ARE STILL HIGHLY UNCERTAIN AS AMOUNTS AND DISTRIBUTION OF ANY SNOW ACCUMULATION WILL LIKELY VARY.

COLDER AIR WILL POUR INTO THE AREA MONDAY AFTERNOON THROUGH TUESDAY MORNING. THERE IS A GOOD CHANCE THAT THE PUGET SOUND CONVERGENCE ZONE WILL BECOME ACTIVE AFFECTING SNOHOMISH AND KING COUNTY FROM LATE MONDAY MORNING THROUGH MONDAY EVENING. ANOTHER CONVERGENCE ZONE COULD ALSO FORM FURTHER NORTH AFFECTING SKAGIT COUNTY AND THE ADMIRALTY INLET AREA. WET SNOW COULD FALL WITHIN ANY CONVERGENCE BANDS WITH SOME POSSIBLE LOCAL ACCUMULATIONS UP TO A COUPLE INCHES ABOVE 500 FEET DURING THE DAYTIME.

HOWEVER...TEMPERATURES WILL DROP FURTHER INTO THE 30S BY MONDAY EVENING SO IT IS POSSIBLE THAT A COUPLE INCHES OF SNOW ACCUMULATION COULD OCCUR DOWN TO SEA-LEVEL.

RAIN AND SNOW SHOWERS WILL END LATER MONDAY NIGHT WITH CLEARING EXPECTED. THIS WILL ALLOW TEMPERATURES TO DROP INTO THE MID 20S TO LOWER 30S. ANY WET PAVEMENT WILL LIKELY FREEZE OVERNIGHT POSSIBLY PRODUCING ICY SPOTS ON ROADWAYS FOR THE TUESDAY MORNING COMMUTE.