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. This air mass is characterised by frequent showers at any time of the year. In the winter months when instability (convection) is most vigorous over the sea, hail and thunder are common across much of the western and northern side of the British Isles. However, eastern Britain may see fewer showers

FZ Freezing (followed by DZ, FG or RA) G G Gust GEN Generally GND Ground GR Hail (5 mm or more in diameter) GS Small hail or snow pellets H H High pressure centre HPA Hectopascals HVY Heavy HZ Haze I IC Ice crystals (diamond dust) ICE Icing INS Inches (on F2309) INTSF Intensifying IRVR Instrumented

generally form in the most unstable cumulonimbus, meaning that there is also a chance of hail, heavy rain and lightning in the vicinity, and if the air is cold enough during winter they can produce snow. Sometimes mammatus may form on other cloud types which produce no rain, though this is far less

of these showers could be quite heavy, with the risk of lightning and hail mixed in with them too. Although many of us will likely stay dry and avoid them." Met Office Deputy Chief Meteorologist Dan Harris commented: “The forecast later this weekend and into the early part of next week comes with larger

Europe, in collaboration with Météo France Merging radar precipitation rates and accumulations with other observations such as rain gauges to improve accuracy. Development of new products using dual polarisation data, such as a 3D hydrometeor (eg rain, hail, snow, ice crystals) classification and 2D

: The empirical relationship between radar reflectivity and rainfall rate is fixed whereas in reality this is highly dependent on precipitation type and is very different for rain and hail. Last updated: 11 February 2013 © Crown Copyright

rain will be accompanied by hail, thunderstorms and gusty winds, leading to flooding and difficult driving conditions.”  Tuesday’s low-pressure system contains the remnants of Hurricane Humberto, bringing with it warm and humid air.  This system will clear eastwards later on Tuesday, however low

Office. He said: “Some within the warning area could see torrential rain, perhaps even reaching 40mm of rainfall within the hour. Later in the warning period there is a risk of large hail, frequent lightning and gusty winds.” The Met Office’s David Oliver comments on the longer-term outlook. He said

torrential rain, hail and lightning strikes. Lightning can cause power cuts and disrupt other utilities and services. Torrential rain and hail can lead to flooding and make driving difficult – with big differences in road conditions from one place to another. Training Community responders and the voluntary

showers by Saturday afternoon and again on Sunday. These will bring the chance of hail and gusty winds for some places, as well as torrential downpours for a few. This will be the first meaningful rainfall for many places across the UK for several weeks.  As is often the case, many places will either miss