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  1. As I'm sure you're aware, lightning bolts can display a wide variety of colours ranging from lilac, white and blue, to even more exotic colours like yellow, orange and even green. There are many causes for this wide variety of colours. This ranges from the temperature of the lightning to atmospheric and environmental conditions, as mentioned below: Lilac/purple lightning Lilac or purple-tinted lightning is usually the most commonly observed colour. It is often caused by precipitation, so the observation of it most likely means that the thunderstorm generating it will be a high-precipitation storm. Lilac lightning is also rumoured to produce louder thunder, though this is disputed. Blue lightning Blue lightning bolts tend to be the hottest lightning bolts to occur on earth. They are also some of the more commonly observed colours (after lilac lightning). Atmospheric-wise, they maybe caused by small amounts of dust in the atmosphere. This is because these dust particles scatter the light coming from the lightning, in a similar way to how molecules in the atmosphere scatter the sun's light, making the sky also look blue. White lightning The light radiated by virtually all lightning bolts is white. This means that to observe it, the air must be free of pollutants and dust which can scatter and refract light - so essentially you're seeing the lightning with very little interference from the atmosphere. White lightning is also the some of the hottest lightning that occurs on earth (after blue lightning). Yellow lightning Yellow lightning bolts are much more uncommon and tend to be cooler than blue, white and lilac lightning bolts are. They also tend to be indicative of dry thunderstorms, so the presence of yellow-tinted lightning could mean that an approaching thunderstorm is a low-precipitation storm. Other colours Other colours of lightning have also been reported. Orange and red lightning has been observed and these bolts tend to be some of the coldest lightning. These colours also tend to be observed near the base of the lightning, as it strikes the ground. Green-tinted lightning is also occasionally seen, and this may be caused by the lightning heating up certain gases in the air, giving it a greenish tint. Well that was a bit of fulminology for you there. I hope you stuck with it, and thanks for reading.
  2. During the 28th the weather was rather humid, but there were no signs in our part of the approaching chaos that was to hit the hythe/kent area that night, even though the forecasts warned of possible storms. By late evening about 10pm, I could hear rumbles and decided to look outside to see if it was a Thunderstorm or just some old person putting the bin out. Sure enough from then on, it turned from the odd flash, to strikes and flashes every few mins. One of the most amazing storms I have ever seen in my life. What was really gutting though, was I didn't have a fully charged camera and missed out on many strikes that not only knocked our power out, but set car alarms off!
  3. Lightning from the 1st July 2015 thunderstorm from Irlam, UK
  4. This video shows a thunderstorm roll through, along with a bunch of weird but interesting cloud formations. The storm was frontal.
  5. I'm one of those people who can feel so completely alive durng a thunderstorm but find them incredibly relaxing too. I know that people finding storms relaxin and using the sounds as sleep aids is incredibly common and I was wondering if anyone knew the science behind it?
  6. A shiny new thread as we head into the second half of July and the mid point of the summer. What a summer it has been. We started the summer with a lot of thunderstorms as June came in with a bang. Unfortunately as June came to a close and we moved into July the temperatures dropped and so did the storm risk. The most thundery early June I can remember has been balanced by the poorest early July I can remember. This looks like it is all set to change though as temperatures rise and summer returns. Temperatures are already rising across the south and this building warmth and humidity will spread northwards through the early part of the coming week, with the heat likely peaking on Tuesday. The first 30c is very likely this week. The increasing heat and humidity also looks likely, on current modelling, to culminate in the possibility of some dramatic thunderstorms. The thoughts of Weather09 in the previous thread provide a good view of what we could expect from current modelling, seen on page 140 of the thread. The very high CAPE values being modeled for Tuesday are unlikely to be realised with strong ridging. It is currently late Tuesday night into Wednesday the period of interest (subject to change of course). Pin pointing an area to be at risk at this range is pointless. I am thinking this thread is going to get busy with lots of excitement, forecasts and thoughts regarding what is likely to happen, even what you are hoping will happen. I am hoping it will be busy with lots of reports of thunderstorms and convective activity by the middle of this week and beyond. I think most of us would not want to see it fill up with "why do I always miss out", "nothing here", "wishing for no storms" or other moaning posts that should be in the correct moaning thread like the one below. Good luck to all those that want a storm. A chart showing MLCAPE for early Wednesday, just to get the excitement flowing
  7. Hey all, I made a tornado compilation quite a while back (December 5th 2015) and I was very proud of my first compilation about tornadoes but, unfortunately it didn't get as much as attention I was hoping for on my youtube channel and that disappointed me a bit so I thought that I'll share it on here with people who have similar interests. https://www.youtube.com/watch?v=HC6wiS5GXkI sorry about the screen resolution I tried to fix it but It seemed that I'd have to start all over again to get it to fix with the correct resolution so I just kept it as it is.
  8. The 27th May had held promise of thunderstorms and for some there had been. Unfortunately for me I was never in the right place at the right time. The combination of busy Friday evening roads and storms that were lasting no longer than a few minutes put pay to me finding success. Luckily, the 28th May also showed hope and this time I could get myself in position before the storms developed. I had driven a long way from Derby to Bristol and so decided stopping over and chasing the next day was the right thing to do. I did not want to go home with nothing! It was not the most comfortable night sleeping, I managed about two hours laid across my back seat. I was not going to let this deter me from another day of chasing though. Waiting for the first developments Despite a few distant flashes overnight from weak storms over the south west Midlands there was little storm activity close by during the night time hours. I had stayed over near to Warminster in Wiltshire at the side of country road near to Heytesbury. As dawn broke I could see glimmers of blue in the skies above, but the land was shrouded in a thin mist and temperatures were at a cool 10c. I decided to drive into Warminster and get fuel for the car, fuel for myself (breakfast) and then headed back to Heytesbury to take a short walk around the fields there. It was around 10:30am that the mist started to clear and the sun came out. Once the sun broke through the temperatures rocketed, by midday they were up at 20c. This isn't that high but with high humidity too it was feeling very warm and sweaty. By midday I had travelled west and stopped in the pretty little town of Mere for some lunch. Thinking the risk looked higher further west in Somerset I took a drive westwards to a picturesque little village called Redlynch just south of Bruton in Somerset. This was a great setting to watch the cumulus clouds in the skies above develop and so I stayed here for a couple of hours, taking another walk as I waited for something to happen. It took a while for the first showers to develop. When they did they were light and did not seem to be showing signs of developing any further. I knew that at around 4pm it was too early to be worrying about another bust day but have to admit the slightest worry was creeping in. By now I was sat not far from Martock. My plan was to stay close to the A303 as this would provide easy access west or east to intercept northwestward moving cells. Ilminster Pulse Storm A short while later I heard a rumble of thunder to my west. I could not see a storm on the radar and with my views somewhat obscured by houses, I could not see a storm either. Even so, I knew what I had heard and so headed for the A303 westbound. The next radar update showed cells had erupted along the A303 and the one I was hearing was just to my southwest and heading in the direction of Ilminster. By the time I reachd the A303 I had a view of dark skies to my southwest and was certain this was the storm I had heard. As I approached Ilminster the rain was getting heavier and soon I was under the cell I had been chasing. By this stage I had not seen any lightning but the rain became torrential and the radar showed it was still intensifying. A bright flash of lightning then filled the sky followed immediately by a bang of thunder which I heard despite being inside the car and driving under now torrential rain. For the next few minutes I drove through a torrential storm with small hail and some gusty winds. I did not see any more lightning but could see on the radar that there was lightning being detected. I was soon ahead of the storm, the advantage of having a fast road against a slow moving storm, and was able to park up not far from Combe St Nicholas to view the storm moving in. As the storm rolled towards me there were a few feint flashes of lightning and thunder. What was surprising is how loud the thunder was despite the lightning being rather weak and the storm seemed a distance away. Unfortunately, just minutes after setting up to film the storm move in it died out as quickly as it had developed. Frustrating, but most of its action had been happening whilst i was in the car. Even so, I was satisfied that I had at least seen something. Checking once more on the radar I could see there were now numerous heavy showers and storms. They were pulse storms and were firing up at one location before dying suddenly and firing up elsewhere. Chasing these storms was going to be difficult. I decided I needed to follow the main line of showers as they very slowly headed northwards in the hope I could be under one when it pulsed up into a storm. Luckily I had decided to head in the right direction for what was about to develop. Bridgwater & Quantock Hills Storm Sitting not far from Taunton and nearby the M5 I saw on the radar that a storm had erupted and was heading towards Bridgwater. Another cell had erupted near to Minehead. These cells looked good on the radar and I knew I could get into the one near Bridgwater very quickly by using the M5. Moments later I was heading up the M5 with a dark grey, brown sky ahead and the occasional feint flash. Once I arrived at Bridgwater I could see a well formed storm to the southwest with more feint flashes. In order to film the storm I needed to be closer to it but not under it and so I drove west and came to rest near the village of Cannington. With my camcorder set up looking west I was now witnessing an active thunderstorm. The storm had a very defined precipitation core and there were frequent flashes of lightning from it. The lightning was feint and all the flashes were intracloud but the thunder was loud and the storm had the look of a strong storm. I expect underneath the storm the lightning would have been brighter and the rain torrential. I was getting a fantastic view though, despite the now low light causing problems trying to focus my camcorder. Driving westwards towards the Quantock Hills I could see more frequent flashes of lightning. It was now very dark despite the time only just approaching 8pm. I pulled up again to the film the storm from a different angle, I was now in front of it rather than alongside it. The storm was exhibiting the same characteristics, frequent but feint flashes of lightning and beautiful sounding thunder crackling across the sky. The rain was light where I was, which meant I could stand and film the storm without getting too wet. My plan was to now drive into the storm, but as I approached it appeared that it had reached its full potential and was now in its dying phase. Luckily it did not die as quickly as the previous storms, and I was able to spend a short while driving underneath it as it dropped a couple of bolts. These were the only CG bolts I had seen during the day with virtually all of the lightning having been intra cloud up to this point. As I chased the storm over the Quantock hills it finally died out, although was still producing some heavy rainfall. During its strongest phase this storm was producing torrential rainfall, as can be seen from the radar grabs below. I have no doubt there were hailstones in there too considering the bright echoes being returned. I had stayed outside the precipitation core in order to be able to get some visibility of the storm. As I was following the storm I could see the amount of water left behind on the roads and the resultant flooding. Another storm had broken out further south and my plan was to drive back towards Taunton in order to intercept this one, but this was not possible as my route had been completely blocked by deep floodwater. Some roads had been turned to rivers. In all a very good day for storms over Somerset. They were pulse storms and this made spending any time with them and getting the footage more difficult, but they were also slow moving and so I was able to get to them with relative ease. For a day in May I was satisfied, some good storms to quench the appetite before the arrival of summer.
  9. It had been a quiet season so far with very limited chase opportunities. Today looked like being the best day for a while with widespread thundery showers quite likely. The risk of organised storms was low due to very little wind shear and fast storm motion. It was not the best day to attempt chasing, today would require me being in the right place at the right time. My target area was around the Humber, although exactly where I would place myself was not yet decided. I set off just after 1pm, heading north from Derby towards the Humber. By this time there were already numerous showers around and some of these had already turned thundery around London and much further north towards the borders. I stuck to my original thoughts though and three hours later I was sat just to the south of the Humber near the town of Barton-upon-Humber. For the next hour my disappointment began to grow as there was very little thunderstorm activity around me, but to add to the frustration there were heavy showers close to home in Derby and these had started to show lightning. As I kept refreshing the radar I could see the showers were developing and then falling apart again... today looked like being a disappointment. All I use for internet on the go is my Nokia Lumia mobile, a 3 Network MiFi dongle and a Netweather Extra subscription – it's not an expensive set up. Around 5pm I noticed an area of showers to the west which were developing and showing signs of holding together. I then noticed the first lightning strike being detected and decided to head just a short distance south to intercept. I did not need to travel far but I was aware the showers were moving quickly and so I moved fast. Around half way between Barton-upon-Humber and Brigg I could see the dark clouds moving in with some very unstable looking clouds ahead of me. As I approached I saw my first flash of lightning to my west and so I came off the main road and found somewhere I could stop and observe away from the distracting sounds of a busy road. Upon finding a decent stopping point I found myself under a dark, billowing storm cloud with some flashes of lightning and growls of thunder being muffled slightly by the strong and gusting wind. Soon after arriving I saw a nice CG drop from the back end of the gust front which was moving over. I now decided to set up my camera looking at where most of the lightning was whilst I was able to sit in the dry of the car as the rain and wind moved in. I use a GoPro Hero 3+ camera which can be housed in a waterproof case. I also use an external microphone (bought separately) attached to the outside of the casing. As the storm moved over most of the lightning seemed to be within the clouds and the rain not particularly heavy but the winds were blasting the rain into my windscreen. It was as the rain began to die down that a few pea sized hailstones started dropping and there was a huge flash just behind me (and the camera) with instant ground shaking thunder. It appeared the storm had now moved so I switched my camera to a new position and as I was setting it up a nice bolt struck close in front with more very loud thunder. The storm was intensifying and I was treated to some nice lightning and thunder whilst a few more hailstones fell from the sky. The following are two captures of the same lightning strike After about 7 or 8 minutes of standing watching the storm I decided to get back in the car and chase. The storm was moving fast and I was never going to catch it but as I drove behind the storm it was clear the core had travelled just a quarter of a mile away from me as the ground was covered by hailstones, making the road icy, and there was a lot of spray and minor flooding. Driving at the rear of the storm I noticed a couple more flashes of lightning but it seemed the activity had began to die down once more. What was interesting was the fact my car thermometer was reading just 4c, some 10c drop from before the storm had come over. Soon after, the sun peeked out through the departing storm clouds and this allowed a gorgeous double rainbow to appear. I was able to stop and observe this rainbow against a black stormy back drop, listening to the sound of distant thunder rumbling away. After this storm moved on towards Grimsby I noticed on the radar that there were numerous thundery showers around and so I drove south through Lincolnshire, passing a couple of heavy showers with more hail. There was also a single CG from one of these as I was driving down the A15. Around an hour later as I was nearby to Coningsby I noticed a nice looking storm cloud with a lowering gust front at its front. This storm cloud looked very photogenic but never went on to produce thunder, although may have done before I found it. Even so, I parked up just ahead of it and watched it pass overhead. It did produce some gusty winds and hail as it passed directly overhead. By this time it was getting late in the day and the sun was setting on what ended up in being a good chase day. Just before it ended, the day had one more treat in store, and this was a beautiful sunset behind another heavy shower.
  10. From the album: Thunderstorms

    Up at 3am to catch this powerful thunderstorm as it skirts up the east side of the Island.

    © 2014 Joshua Risker

  11. From the album: Thunderstorms

    One of the two thunderstorms I got to see whilst on holiday in Greece, July/ August 2014.

    © 2014 Joshua Risker

  12. Sprites are a form of lightning (yes I'm talking about a form of lightning, not the drink!) that occur in the mesosphere above thunderstorms in the troposphere. They are often triggered by discharges between the thundercloud below and the Earth. Despite all of this, they are rarely documented. There have only been a few instances of them being observed, like the image below that was taken from an aircraft in July 1994.
  13. Hello, wasn't sure if this will be any interest to anyone but though I'd might post it. I have big interest in weather and tsunamis so personally was very interested when I found out this, I hope it not off topic "Folkestone (Kent) and Brighton (Sussex), 20 July 1929 — large tsunami-like wave struck the Kent and Sussex coasts, busy with tourists, and drowned two people, at Brighton and Worthing the wave was accompanied by sudden downpours of rain and high winds, but at Folkestone and Hastings, where one person drowned at each, the weather was clear and the unexpected wave was estimated to be c. 3.5 and 6 m high, respectively. Douglas (1929) suggests the wave was caused by a squall-line travelling up the English Channel, coincident with thunderstorms, and so may be referred to as a meteotsunami." http://www.hadesign.co.uk/worthing_history/history_pages/html/Wish_you_were_not_here.html http://www.bgs.ac.uk/research/highlights/2011/tsunamiSWEngland2011.html
  14. Any invests that from the in the Atlantic basin in 2012 will be discussed in this thread. more then a little out of season but we have 90L
  15. From the album: Storm Pictures

    Explosive development around early afternoon with intense rain and thunder shortly after this shot.
  16. I managed to grab a quick shot of this on my phone. Strange formation!
  17. From the album: Isle of Man Scenics

    Moonrise over the small lagoon, Groudle. This photo was taken the night before an early morning thunderstorm!
  18. xSnow

    Thunderstorm A5

    From the album: Thunderstorms UK

    Dark cloud, not much activity really.
  19. xSnow

    Thunderstom A

    From the album: Thunderstorms UK

    Strange Towering Cumulus clouds, and a possible Multicell Cloud!

    © Daniel

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