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• mwr_2025_06_for_printpdf

  pressure dominant and unsettled weather, in a sharp change from previous months. A series of Atlantic weather systems brought rain in the first week, at times heavy. Temperatures began to increase in the second week and high pressure returned to bring more settled conditions, although there were still

• caa-case-study-1---high-pressure.pdf

  is the cloud base associated with it? Does it produce rain and if so, how much of it is reaching the ground? How much does it affect the visibility? Anticyclones (high pressure) are normally associated with clear skies and good weather, so it is often assumed that there are no aviation hazards

• Wet and windy weekend for many

  From the early hours of Saturday morning, a band of heavy rain will gradually move in from the southwest and transition northeast through the day, with the potential for some surface water flooding where rain falls on saturated ground. A number of warnings for rain have been issued. Wind

• Briefing on Arctic & Antarctic sea ice - August 2026

  ) 925 hPa temperature over the Arctic. Sea level pressure and temperature data are from the ERA5 reanalysis (Hersbach et al., 2017). The 925 hPa temperature represents conditions around 800 m above sea level and shows the position of warm/cool airmasses more clearly than the surface temperature

• mwr_2025_07_for_print.pdf

  pressure covered the UK and heavy showers developed widely. In Northern Ireland, significant surface water flooding was reported in Enniskillen where many roads were reported impassable for a time. In Manchester a tram line in the Didsbury area was reported closed for a time due to flooding, while

• mwr_2025_07_for_printpdf

  pressure covered the UK and heavy showers developed widely. In Northern Ireland, significant surface water flooding was reported in Enniskillen where many roads were reported impassable for a time. In Manchester a tram line in the Didsbury area was reported closed for a time due to flooding, while

• Briefing on Arctic and Antarctic sea ice - June 2019

  on average (Figure 5a). The surface temperature anomalies were associated with a pattern of higher-than-average sea level pressure over the North American continent, and lower-than-average sea level pressure over much of the Arctic Ocean itself, and the north coast of Siberia, with regions of mild

• Arctic and Antarctic end-of-season report - October 2025

  emitted from the Earth’s surface; the precise algorithm used to convert the microwave signal to ice fraction leads to differences in the measured extent. In 2025, this uncertainty is likely even higher than normal due to a recent change in the satellite sensor used to produce the two indices. Figure 1

• mwr_2025_09_for_print.pdf

  of the month. There were also periods of strong winds and heavy downpours, sometimes associated with thunderstorms, at several points in the month. Settled conditions crept in with high pressure on the 21st, but the rain returned on the 27th, widespread but particularly heavy over the west coast of Scotland

• mwr_2025_09_for_printpdf

  of the month. There were also periods of strong winds and heavy downpours, sometimes associated with thunderstorms, at several points in the month. Settled conditions crept in with high pressure on the 21st, but the rain returned on the 27th, widespread but particularly heavy over the west coast of Scotland