Snowy In Cascades; 80s Possible Next Week

April 23, 2014

10pm Wednesday…

Quite a dump of snow in the Cascades this afternoon/evening.

Sophie Hood Snow Totals

Looks like a foot or so has fallen so far above about 5,000′, with lighter amounts (just a few inches) down in the passes.  The snow level has zoomed up to around 6,000′ this evening in advance of the cold that moves through late tonight.  I expect another 3-5″ with the showers tomorrow, but no snow back down to the passes until tomorrow night.  This snow is overdue, because we’d typically see about 2′ of snow each April at Government Camp.  Check out the past 6 years up there…those were some cold/snowy Aprils around 2010!

MarkSnow_GovtCampApril

Here in the lowlands a very wet afternoon/evening as expected.  The rain was slow to arrive but now it’s here to stay through sunrise.

Thursday will be a showers and sunbreaks sort of day, same thing for Friday.  One more cold front moves into the Pacific Northwest Saturday and then a warm front drags across Sunday.  Then after ALL THAT, we see some warmer and drier weather.

By Tuesday and Wednesday a strong upper-level ridge will build right along the West Coast in advance of a cold digging upper-level trough in the east Pacific.  The GFS has finally come around to the sharper ridging the ECMWF has been showing.

MarkJetStream

We haven’t seen this pattern so far this spring with such highly amplified troughs and ridges.  It appears it won’t stick around long, but it will be a dramatic change with offshore flow and sunshine.  The ECMWF continues to be the warmest, showing 850mb temps +14 next Wednesday with easterly wind all the way to the beaches with a thermal trough.  That would give us a high temperature of 80-85 degrees in Portland.  I didn’t go that wild with temps (yet), but the main point is that we’ll likely see our warmest temps so far this spring for the last two days of April.  That’s AFTER 4 more days of wet weather.

Here are the 850mb ensemble charts from the 18z GFS and 12z ECMWF showing the sharp jump in upper-level temps the middle of next week:

tseries_850t_000-360_Portland

tseries_850t_000-384_Portland

 

Chief Meteorologist Mark Nelsen