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, including columns and plates. The refraction phenomena that can be generated by such crystals are well-described in many sources. The theory is given by Liou and Takano (1989). These light-refracting processes lead to the formation of a number of haloes and other optical phenomena. The most commonly

will experience near-normal conditions. Winds will strengthen across the far southwest, with strong and gusty easterly winds developing later in the day. The evening and overnight period will remain dry across most of the UK. However, light rain or drizzle is possible across the Shetland Islands

in between with temperatures returning to average. Further bands of rain will move across northern parts with strong winds at times. There could be some light, patchy rain in the south on Friday and Saturday before a drier and sunnier day on Sunday. For those going to Glastonbury, after a mild

:00) The northeast will enjoy some sunny spells, but scattered showers, potentially heavy, are forecast. Winds will be light, and temperatures will be closer to the seasonal average, peaking at 9°C. Fans should be ready for sudden downpours. Tottenham Hotspur vs Brentford (15:00) London

Tuesday will bring a mix of weather across the UK. Much of England and Wales can expect a dry day with sunny spells, particularly away from the northern and western fringes. Here, cloud will be more prevalent, with outbreaks of mainly light rain and drizzle, especially in the north-west

to the Climate Prediction Centre, La Niña conditions ate present with a La Niña Advisory issued. All indices are currently negative and point to La Niña conditions with some atmospheric response evident, with these conditions to remain over the coming few months, returning to neutral early next year. 3

of Metrology in Australia (BoM) have declared that La Niña is present. According to the latest forecasts, from the WMO Global Producing Centres for Seasonal Prediction, La Niña is the most likely outcome over the next few months. For January–March, the likelihood of returning to ENSO-neutral conditions

to be declared. In contrast, according to the Climate Prediction Centre, La Niña conditions are present with a La Niña Advisory issued. All indices are currently negative and point to La Niña conditions with some atmospheric response evident, with these conditions to remain over the coming few months

(November-January). However, other centres (such as BoM) have predictions which are much more finely balanced between ENSO-neutral and La Niña. Clearly, there is some uncertainty with predictions. Most likely is that ENSOneutral conditions will persist for the next couple of months, with any transition

, the rainfall patterns over the next 3-6 months are expected to be strongly influenced by the ongoing mature La Niña event across the tropical Pacific. 3-Month Outlook December to February - Rainfall The latest statement from the NOAA Climate Prediction Centre / NCEP states that “La Niña is likely