0:00:03 > 0:00:05Hello. Low pressure systems, weather fronts, isobars,
0:00:05 > 0:00:08some sunshine and some early-morning mist and fog -
0:00:08 > 0:00:12the weather for the next week or so is a classic autumnal mix-up.
0:00:12 > 0:00:15And it is often, no matter which way you measure it,
0:00:15 > 0:00:19as of Thursday, because Thursday marks the autumn equinox.
0:00:19 > 0:00:22All to do with the position of the Earth rotating around the sun,
0:00:22 > 0:00:25and it's in such a position on Thursday
0:00:25 > 0:00:27that day and night are pretty much equal,
0:00:27 > 0:00:28so from now on,
0:00:28 > 0:00:31the nights will be longer than the days.
0:00:31 > 0:00:34We are pretty much in autumn, and you can
0:00:34 > 0:00:37tell by weather fronts out in the Atlantic.
0:00:37 > 0:00:40The first of those fronts fizzling out during Thursday,
0:00:40 > 0:00:43just bringing cloud across central areas
0:00:43 > 0:00:45and a few showers tracking eastwards.
0:00:45 > 0:00:47Either side of that, some September sunshine
0:00:47 > 0:00:50lifting temperatures potentially over 20 degrees
0:00:50 > 0:00:52across East Anglia and the south-east,
0:00:52 > 0:00:54more typical values elsewhere 15 to 17.
0:00:54 > 0:00:57There'll be showers in the far north-west.
0:00:57 > 0:00:59We'll see a few more showers in the evening
0:00:59 > 0:01:00across Northern Ireland, Scotland,
0:01:00 > 0:01:02north-west England,
0:01:02 > 0:01:04but for many, it will be a dry night
0:01:04 > 0:01:05and a cooler night
0:01:05 > 0:01:08across the south and the east.
0:01:08 > 0:01:09Some mist and fog,
0:01:09 > 0:01:11but that will clear quickly and for most,
0:01:11 > 0:01:13Friday is a fine, bright, dry day
0:01:13 > 0:01:14with sunny spells.
0:01:14 > 0:01:16Notice the wind starting to pick up,
0:01:16 > 0:01:19another weather system in the far north-west.
0:01:19 > 0:01:21Temperatures 15 to 19 Celsius.
0:01:21 > 0:01:23That weather system drifts to the north of the UK,
0:01:23 > 0:01:25but its trailing weather front
0:01:25 > 0:01:27is the main player through the weekend.
0:01:27 > 0:01:30Lots of isobars, so winds picking up,
0:01:30 > 0:01:32and this front bringing a lot of heavy rain,
0:01:32 > 0:01:35looks particularly soggy over western Scotland.
0:01:35 > 0:01:39Turning wet across western parts of England and Wales.
0:01:39 > 0:01:41Ahead of that front, southerly winds
0:01:41 > 0:01:43yet again sucking up some warmth,
0:01:43 > 0:01:45so we could, with hazy sunshine,
0:01:45 > 0:01:47reach 23 degrees Celsius.
0:01:47 > 0:01:49Some uncertainty about the timing of that front,
0:01:49 > 0:01:51but it could be draped across East Anglia
0:01:51 > 0:01:53and the south-east on Sunday morning,
0:01:53 > 0:01:55potentially a damp start here.
0:01:55 > 0:01:57It clears and then we see sunny spells,
0:01:57 > 0:01:58a bit of a breeze,
0:01:58 > 0:01:59temperatures close to the average
0:01:59 > 0:02:02because we've got more of a westerly influence.
0:02:02 > 0:02:05There'll be plenty of showers on Monday,
0:02:05 > 0:02:07and behind me, things are
0:02:07 > 0:02:10getting complicated out in the Atlantic,
0:02:10 > 0:02:13and that's the main problem next week. Why so?
0:02:13 > 0:02:16Well, not to do with this storm, Lisa,
0:02:16 > 0:02:18but more to do with this storm, Karl.
0:02:18 > 0:02:20It is a tropical depression.
0:02:20 > 0:02:22It'll intensify and drift northwards.
0:02:22 > 0:02:27As it does so, it's likely to get close to Bermuda through the weekend
0:02:27 > 0:02:30and potentially may become a hurricane.
0:02:30 > 0:02:33When these kind of storms start to drift north,
0:02:33 > 0:02:35they interact with our weather
0:02:35 > 0:02:37because they interact with the jet stream,
0:02:37 > 0:02:39that fast-moving ribbon of air high up.
0:02:39 > 0:02:41Usually, the jet stream drives the system
0:02:41 > 0:02:43at the ground,
0:02:43 > 0:02:45but when you've got something with as much energy as
0:02:45 > 0:02:46a tropical storm,
0:02:46 > 0:02:48or potentially a hurricane,
0:02:48 > 0:02:49that can influence the jet stream,
0:02:49 > 0:02:51so it adds to complications
0:02:51 > 0:02:53and uncertainty, so the jet stream
0:02:53 > 0:02:55tending to come in like this
0:02:55 > 0:02:57through much of next week,
0:02:57 > 0:02:59which means the wettest,
0:02:59 > 0:03:00windiest weather will be across
0:03:00 > 0:03:02more northern parts of the UK,
0:03:02 > 0:03:04but we are also going to be
0:03:04 > 0:03:05on the warm side of that jet,
0:03:05 > 0:03:07and there's the potential
0:03:07 > 0:03:09to draw up someone warm air,
0:03:09 > 0:03:10especially around the
0:03:10 > 0:03:12middle part of the week.
0:03:12 > 0:03:14I'm using words like "potential"
0:03:14 > 0:03:16and "possibly" because of Karl,
0:03:16 > 0:03:19and the interaction grows the uncertainty
0:03:19 > 0:03:22so generally next week, often quite blustery,
0:03:22 > 0:03:23the wettest in the north-west,
0:03:23 > 0:03:25but Karl adds uncertainty,
0:03:25 > 0:03:27hints it might get a bit warmer.
0:03:27 > 0:03:30We'll definitely be keeping you posted.
0:03:32 > 0:03:33Watch this. It is amazing.