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Cumulonimbus clouds

. More commonly known as thunderclouds, cumulonimbus is the only cloud type that can produce hail, thunder and lightning. The base of the cloud is often flat, with a very dark wall-like feature hanging underneath, and may only lie a few hundred feet above the Earth's surface.  How do cumulonimbus


Stay safe in thunder and lightning

can occur at any time of the year but it is during the summer months when thunderstorms in the UK are most likely to produce large hail, gusty winds and torrential downpours that can cause disruption to transport networks and damage property. One of the most notable aspects of thunderstorms can

NCIC Monthly Summary

, blustery and prolonged in some other areas, also turning heavy and thundery in places with hail, and snow over hills, the maximum at Blencathra (Cumbria) struggling to 5.7 °C. The 5th started chilly, mostly sunny and dry, though showers in western areas soon spread eastwards to cover most parts

Heavy Rainfall 8 June 1957

of Wales was exceptionally heavy and ccompanied by hail and thunder at times. Northern England along with much of Scotland and Northern Ireland had a mainly dry start to the day with sunny spells but showers, again some on the heavy side with the odd rumble of thunder, developed through the day, heaviest


Cold with springtime wintry showers

see our recently updated National Severe Weather Warnings pages. In the north, showers will bring a mix of sleet, snow and hail, which could be seen even at low levels at times. Some accumulation of snow is likely, particularly at night and at higher elevations. In the south some wintry showers

Definitions of codes

) 15 Heavy rain 16 Sleet shower (night) 17 Sleet shower (day) 18 Sleet 19 Hail shower (night) 20 Hail shower (day) 21 Hail 22 Light snow shower (night) 23 Light snow shower (day) 24 Light snow 25 Heavy snow shower (night) 26 Heavy snow shower (day) 27 Heavy snow 28 Thunder shower (night) 29 Thunder


Hail/thunderstorms over east Devon - 29/30 October 2008 Heavy and thundery downpours over east Devon, with flooding and travel disruption... An area of low pressure and associated frontal system over south-west England at 0000 UTC on 30 October 2008 (see chart below), resulted in localised

Ottery St Mary Hailstorm 29 to 30 October 2008

29 - 30 October 2008 (Hail and thunderstorms over East Devon) Weather chart for 0000 UTC on 30 October 2008 General summary An area of low pressure passed over South West England at around midnight on 30 October 2008. The frontal system associated with the low pressure system brought heavy rain


Ice is simply water substance in a solid form. It occurs in the atmosphere and on the earth's surface and can take many different forms such as ice pellets, snow, hoar frost, rime, glaze and hail. Ice can form over the surface of garden ponds, lakes and even rivers during exceptionally cold periods

Derby Day Thunderstorm 31 May 1911

, across parts of South East England. Significant weather event • 17 people killed along with 4 horses • 159 flashes of sheet or fork lightning in a 15 minute period around 17.30 recorded at Epsom • Hail 1½ to 2 inches in diameter fell at Sutton • Landslides closed both the Great Western Railway at Park

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