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New WAFC SIGWX Verification When developing the new automated WAFS SIGWX forecasts, checks have been made to ensure that the forecast areas of cumulonimbus cloud, icing and turbulence provided within these forecasts have a good level of accuracy and are at least as good as, if not better than

Volcanic Ash – T+0 annotated satellite image Issued 1015 UTC on Fri 18 May 2018 LOW CONFIDENCE- Areas of cloud may soon obscure forward edge of plume HIGH CONFIDENCE- Large gaps in cloud means VA is clearly visible in satellite imagery © Crown copyright Met Office

to support you with discussing tornadoes. What is a tornado? A tornado is a rapidly rotating column of air that reaches between the base of a storm cloud and the Earth’s surface. They form in very unsettled weather conditions as part of severe thunderstorms. Many conditions need to be present

Following a couple of days with sunny spells and showers, the showers most prevalent across Scotland and northern England, conditions are likely to turn briefly more settled on Wednesday for most, before weather fronts slowly introduce more cloud and outbreaks of rain from the Atlantic later

. During the day a rain band pushed slowly south but for Wales, central southern and South West England it remained dry with sunny intervals and patchy cloud, the best of the sunshine was across Devon and Cornwall and parts of South Wales. It was a windy and cool day everywhere with moderate to fresh

EXERCISE EXERCISE EXERCISE VOLCICE Volcanic Ash T+0 annotated satellite image Issued 1000 UTC on Fri 12 Jun 2020 LOW CONFIDENCE ✂ Meteorological cloud is inhibiting view of ash in satellite imagery HIGH CONFIDENCE ✁ IMO ground-based radar detected ash cloud to height of 18km © Crown copyright Met Office

Volcanic Ash – T+0 annotated satellite image Issued 1550 UTC on Fri 19 Oct 2018 VOLCICE EXERCISE LOW CONFIDENCE- Meterological cloud in vicinity of Kverkfjoll partially obscuring view of ash cloud. LOW CONFIDENCE- PIREP reported VA at FL180 at 19/1530 UTC. Ash not discernible on imagery. VOLCICE EXERCISE © Crown copyright Met Office

Volcice Exercise – 1230 UTC annotated satellite image Issued 1230 UTC on Tue 15 Dec 2015 EXERCISE LOW CONFIDENCE- VA plume observed by C-band radar in Keflavik rising to 7km, but cloud covering the volcano LOW CONFIDENCE- Cloud to the north of the volcano is masking any ash emitted EXERCISE EXERCISE © Crown copyright Met Office

Thursday begins on an unsettled note, particularly in the far southeast, where heavy showers and thunderstorms are expected during the morning. These will gradually clear offshore, making way for a more widespread band of cloud and rain moving in from the north and west. As this system progresses

persistent across western and northwestern Scotland, particularly over windward hills and mountains. Coastal gales are likely along the west coast of Scotland, where a National Severe Weather Warning is in force. As the day progresses, this cloud and rain will gradually extend into parts of northwest Wales