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• Seasonal forecasts and climate drivers resources

  high-pressure systems to dominate, resulting in calmer, drier weather. What causes the jet stream? The jet stream exists mainly due to temperature contrasts between the equator and the poles. In the northern hemisphere, cold air lies to the north of the jet stream, while warmer air is to the south

• mogreps-uk-parameters-may-2019.pdf

  ) Instantaneous snow depth water equivalent Liquid water equivalent (LWE) depth of the snow lying on the surface (ground). Typically water is 10 times as dense as snow so multiplying by 10 gives an approximate depth of the snow although wet snow can be significantly denser and powder snow much less

• mogreps-uk-parameters-may-2019pdf

  ) Instantaneous snow depth water equivalent Liquid water equivalent (LWE) depth of the snow lying on the surface (ground). Typically water is 10 times as dense as snow so multiplying by 10 gives an approximate depth of the snow although wet snow can be significantly denser and powder snow much less

• mwr_2023_03_for_print_v2pdf

  of 40cm in some higher-lying Sheffield suburbs. There was also significant transport disruption with road closures and several thousand affected by power outages in Northern Ireland. A similar combination of road closures and local power outages affected parts of North Wales. After a battle between

• WMO485titlepage

  ), the ROC curve and the standardized area under the curve (such that perfect forecasts give an area of 1 and a curve lying along the diagonal gives 0.5) should be provided. For Level 2 information (gridded values), the standardized area under the ROC curve should be provided. 2.2 Reliability diagrams

• mo-state-of-uk-climate-2015-v3.pdf

  2002. Year 2015 is ranked 16th and for the UK overall lies directly on the smoothed trend-line (Figure 4). Nevertheless, while year 2015 might be considered near normal in comparison to the most recent decade, it would still be a notably warm year compared to the first eight decades of the series

• mo-state-of-uk-climate-2015-v3pdf

  2002. Year 2015 is ranked 16th and for the UK overall lies directly on the smoothed trend-line (Figure 4). Nevertheless, while year 2015 might be considered near normal in comparison to the most recent decade, it would still be a notably warm year compared to the first eight decades of the series

• climate-risk-report-for-sea---v6-final-april-2026.pdf

  and environmental contamination in low-lying areas, especially those lacking adequate drainage and faecal waste management (3.3.4). Over 20 million urban residents are already 4 at high risk from flash floods, mainly in Viet Nam (10 million), Cambodia (4 million), and Indonesia (3 million). In densely populated

• public-weather-service-customer-supplier-agreement-2025-30-websitepdf

  each meteorological element is ‘correct’. For example, an 80% score means the forecast is right 80% of the time. Green – March 2026 36-month score shows long term improvement in the accuracy of this parameter (exceeds March 2023 score). Amber – March 2026 36-month score lies within tolerance band

• climate-risk-report-for-sea---v6-final-april-2026pdf

  and environmental contamination in low-lying areas, especially those lacking adequate drainage and faecal waste management (3.3.4). Over 20 million urban residents are already 4 at high risk from flash floods, mainly in Viet Nam (10 million), Cambodia (4 million), and Indonesia (3 million). In densely populated