Cold Showers Continue

April 17, 2007

SnapshotNice convective shower day today, although there were no lightning strikes anywhere west of the Cascades from Seattle to Californiad.  Plenty of hail though as a very cold upper-level trough is now overhead.  It’ll still be overhead tomorrow.  There is no obvious trigger for convection, so it should be strongly diurnal (based on daytime heating).
As I suspected yesterday, with a cold trough still basically overhead Thursday and Friday, it’ll be tough to avoid afternoon showers those days.  And now I see our RPM model shows afternoon convection over the Cascades and Coast Range Thursday afternoon.
More cool weather over the weekend with another trough, then HOPEFULLY a change towards higher 500mb heights will bring us milder and more seasonal late April weather next week.  Some models are showing that.
By the way, April 18th last year (tomorrow’s date) was the beginning of a 3 week stretch of warm and unusually dry weather.  Remember?  Wouldn’t that be nice!  Mark