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Showing results for tags 'pressure'.
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As regards pressures, airmass and fronts. 1. In SUMMER is an Occluded Front is an area of squeezed walm air pushed above to masses of moving cooler air thus forming quite unstable conditions in that area? If so is an occluded front more liable to produce a greater risk of unsettled weather ie : hail and thunder with strong gusts over a longer period of time than just a moving cold front pushing a warm mass. 2. In the WINTER a cold front can cause snow depending on the amount of moisture in the walm mass area or at the front edge? 3. In the summer high pressure is generally warm fair weather but in the winter cool settled weather is the norm? 4. Low pressure regardless the time of year is unsettled but not always stormy? I respect there maybe more 'machanics' behind what I say but is the basic principle right? I know some of these questions seem basic but I have always deamed the above to be correct and I just need a bit of clarity to help my selfeducation as sometimes the weather models / forecasts confuse or conflict ones train of thought.
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Was browsing through the modis (terra) near real-time subsets when I spotted something a little out of place on the thumbnail images between Australia and Antarctica. I then had to have a gander at at a larger pic to see what it was, then look at the aqua version, taken a little later to see if it was still there. I thought the contrast between the clear skies and the ring of cloud surrounding it was quite spectacular! A quick check for other satellite imagery on the BOM site, gave a IR image of the same area, showing the same circle, though not as clearly defined. And the explanation for it was a simple high pressure system! I realise it's not anywhere near as spectacular as some other shots (especially some of the storm chase pics!) but I find it impressive that a simple high pressure system can produce something that looks so impressive and slightly ominous too, like something punched a huge hole through the clouds!
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[b]No this isn't an entry about the fall of social taboos! [/b][color=#000080]In fact I am talking about fahrenheit! This week parts of the north-east will experience temperatures in the mid 60s fahrenheit (17-19c). It doesn't sound impressive, but bear in mind temperatures have struggled to get past 12c during the last few weeks, and the brisk northerly winds have made it feel like February![/color] [color=#000080]Happily the weather improves this week, and although those of us on the east coast will see more cloud and lower temperatures, it will nontheless be a substantial improvement. What happens after this weeks warmth is anyones guess, but a return to the cold dross we have seen for most of May looks unlikely, thankfully.[/color] [color=#800000]On to sport, and a big congratulations to York City for their [url="http://www.bbc.co.uk/sport/0/football/18049175"]play-off win[/url] over Luton Town yesterday. York now return to the football league after an 8-year absence, and while you have to feel sorry for poor ol' Luton, it is terrific to see York back where they belong.[/color] [color=#800000]Plenty of golf action occured yesterday, with the booming Belgian Nicolas Colsaerts [url="http://www.usatoday.com/sports/golf/story/2012-05-20/volvo-world-match-play-championship-nicolas-colsaerts-beats-graeme-mcdowell/55093180/1"]beating[/url] Graeme McDowell in the Volvo Matchplay Final. Colsaerts takes home his biggest paycheque to date and moves to just outside the top 30 in the world rankings. Meanwhile, Jason Dufner [url="http://seattletimes.nwsource.com/html/golf/2018252094_golf21.html"]won[/url] the corresponding PGA Tour event in Americaland.[/color] [color=#006400]On a wildlife note, it has been more than a little disappointing on the insect front. I still haven't seen one damselfly or dragonfly adult yet, and although I did see a few butterflies around during late March and early April, the first (and in some cases only) generations on the wing have really [url="http://www.bbc.co.uk/nature/18101581"]suffered[/url] in the brutal weather. Happily, birdlife hasn't suffered too much, with plenty of swallows, swifts, house and sand martins about - great to see![/color] [b]That's all from me for now, thanks for reading[/b] [img]http://cdn.nwstatic.co.uk/forum//public/style_emoticons/default/dirol.gif[/img]