Cold, Unstable Air Brings Snowfall Downward To Higher Hills Roughly The Puget Audio Region
Unusually mutual depression temperature air has moved over the northeast Pacific together with the Pacific Northwest, creating unstable conditions together with snowfall descending to the higher hills.
During the by hr (10 AM), snowfall was reported at Paine Field inwards Everett (604 ft) together with at Sea-Tac Airport (452 ft). At Peter Benda's family inwards Bellevue (1300 ft), snowfall was accumulating inwards a winter-like scene.
Using the capabilities of the City of Seattle's SNOWWATCH app, nosotros tin flame run into that the freezing degree this morning time has dropped to almost 1300 ft (see plot of temperatures inwards a higher house SEA-TAC airdrome below), which agency the snowfall degree would endure roughly 300 ft (below that degree at that spot would endure entirely rain).
Cold air has moved inwards aloft, associated alongside an upper-level depression pressure level centre that is centered W of Vancouver Island (see 500 hPa--around 18,000 ft-- conditions map below for v AM Fri morning).
Here is a temperature map at roughly 10,000 ft (700 hPa)--you tin flame run into the mutual depression temperature air aloft (purple colors) associated alongside the low.
With mutual depression temperature air aloft together with warming temperatures at the surface (it IS belatedly March), at that spot is a really large alter of temperature alongside peak together with that promotes instability: having the lower atmosphere suspension upward into upward moving thermals together with sinking air to a greater extent than or less them. Just similar inwards your hot cereal pot when yous plough on the burner. Upward motion results inwards cumulus, cumulus congestus, together with cumulonimbus clouds, resulting inwards intermittent heavy showers. Maybe some soft hail or graupel if yous are lucky.
You tin flame run into the instability inwards the visible satellite picture this morning. The small-scale elements are the anvils from convective clouds.
The work for lowland snowfall lovers is that low-level air is coming off the warm body of body of water (which is almost 50F), making it equally good warm for snow, together with specially accumulating snow, to accomplish sea level.
The threat of calorie-free lowland snowfall over the hills is non over yet. Tomorrow morning, the upper degree depression together with its surface reflection volition approach together with deed S of us (see surface conditions map at 8AM Saturday), alongside cool air over western Washington. Very weak onshore flow. There volition endure plenty upward motion to promote some showers of snowfall together with rain.
The latest UW WRF model piece of work shows some calorie-free snowfall getting closed to sea degree for the 24h ending v PM Saturday. Enjoy the snowflakes...this could endure your final thought of them until adjacent winter.
During the by hr (10 AM), snowfall was reported at Paine Field inwards Everett (604 ft) together with at Sea-Tac Airport (452 ft). At Peter Benda's family inwards Bellevue (1300 ft), snowfall was accumulating inwards a winter-like scene.
Using the capabilities of the City of Seattle's SNOWWATCH app, nosotros tin flame run into that the freezing degree this morning time has dropped to almost 1300 ft (see plot of temperatures inwards a higher house SEA-TAC airdrome below), which agency the snowfall degree would endure roughly 300 ft (below that degree at that spot would endure entirely rain).
Here is a temperature map at roughly 10,000 ft (700 hPa)--you tin flame run into the mutual depression temperature air aloft (purple colors) associated alongside the low.
With mutual depression temperature air aloft together with warming temperatures at the surface (it IS belatedly March), at that spot is a really large alter of temperature alongside peak together with that promotes instability: having the lower atmosphere suspension upward into upward moving thermals together with sinking air to a greater extent than or less them. Just similar inwards your hot cereal pot when yous plough on the burner. Upward motion results inwards cumulus, cumulus congestus, together with cumulonimbus clouds, resulting inwards intermittent heavy showers. Maybe some soft hail or graupel if yous are lucky.
You tin flame run into the instability inwards the visible satellite picture this morning. The small-scale elements are the anvils from convective clouds.
Perhaps a to a greater extent than impressive thought is from the infrared satellite picture (the shading shows the temperature of the cloud tops, alongside white beingness the highest). Cold, deep convection over together with off our coast.
The work for lowland snowfall lovers is that low-level air is coming off the warm body of body of water (which is almost 50F), making it equally good warm for snow, together with specially accumulating snow, to accomplish sea level.
The threat of calorie-free lowland snowfall over the hills is non over yet. Tomorrow morning, the upper degree depression together with its surface reflection volition approach together with deed S of us (see surface conditions map at 8AM Saturday), alongside cool air over western Washington. Very weak onshore flow. There volition endure plenty upward motion to promote some showers of snowfall together with rain.
The latest UW WRF model piece of work shows some calorie-free snowfall getting closed to sea degree for the 24h ending v PM Saturday. Enjoy the snowflakes...this could endure your final thought of them until adjacent winter.
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