But surely a localized forecast is more relevant to the average viewer than a national one?
There are a couple of other posts in this thread along these lines. If anything, in an age of weather apps on smartphones, it's probably the local forecast on TV which is slowly becoming less necessary than it was. There are a multitude of people who might be interested in a national forecast, especially near the end of the week, when anyone who's going away over the weekend will want to see a national forecast spanning the next couple of days at least. Quite often the national forecaster can give a wider context which is of interest too (although the US story last night was indeed tenuous!)
When I've seen the "nations" do this in the past, they often zoom out quickly to show the UK in the middle of the following day, before zooming back in and carrying on with an otherwise entirely local forecast. David Braine, at least, had the foresight to separate the regional from the national altogether last night.
To the people who say there are other sources for your weather, it's the forecast after the main news of the night and every other BBC1 bulletin is followed by an in-depth national weather forecast. It's not a big ask. Especially when it's actually being made and shown to half the audience.
Steve Williams gave kudos