Posted: 09/05/2013 10:38 AM by Brisebois
About as good as it gets for May with a full latitude upper ridge extending from the Pacific Northwest to eastern Alaska.
Only minor tweaks to the forecast today. Under the ridge the marine influence should be at a relative minimum for the inner south coast Friday morning. A very minor shortwave may set off isolated convection as it transits the southern interior Friday evening.
Still a major pattern change expected Saturday as the front currently offshore edges towards the coast. Prefer the slower GFS/CDN Glob timing bringing rain to the lower mainland Saturday evening. Initially at least this will be a high theta-w
system and slow moving so fairly copious amounts can be expected over the south coast Saturday night and Sunday. The interior will most likely see its main rain event Monday as the lagging upper trough moves through.
Edited: 09/05/2013 11:44 AM by Wu
No convection today under strong upr ridge. LAM 06z run shows some cells will develop over swrn interior late tomorrow and REG 12z run shows those cells will move eastwards and produce isolated showrs over the southest corner tomorrow overnight. It is still uncerntain at this time for the development of those cells as airmass looks too dry