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- 04:00 PDT/PST
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Not Much Change
Generally, there isn't any big change on the way in the next couple of days. In the Gulf of Alaska, an area of low pressure will linger and give showers to northern BC and the Yukon. In the south, a ridge of high pressure offshore will continue to bring an onshore flow to the coast and close to seasonal temperatures. The southeastern interior is the exception, where scattered afternoon thunderstorms are possible. Daytime highs will drop a few degrees over the next couple of days.
It's not until Wednesday when a more significant change is forecast. A cold front will bring some showers or thunderstorms, mostly to the central and northern interior but also possible in the southern interior too.
The 500mb animation displayed above shows an upper low over southern Alaska and an upper trough swinging into northern BC tonight and Monday. This brings cooler air (indicated by the dashed blue lines), showers and possible thunderstorms to the northern half of BC and the Yukon. On Tuesday, there's not much change and the broad upper low remains over the Alaska Panhandle. An upper trough over the Pacific swings around the base of the upper low late Tuesday to reach the BC coast early Wednesday morning and moves into the BC interior Wednesday afternoon. This will provide favourable conditions for thunderstorm development.