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• Tropical cyclone forecast verification - measures of error

  strengthening or weakening (positive if better than chance). Central pressure bias - mean bias in the forecast central pressure See below for a diagrammatic explanation of track error statistics.  Sign conventions DPE values are always positive ATE values are positive if the forecast position lies ahead

• Snow Survey of Great Britain

  at the station, days with snow lying and the total depth of undrifted snow at the station, normally at about 09 GMT. Observers also sent, where possible, notes on snow cover in the surrounding hills or mountains at various heights (at intervals of about 150 metres) even if snow cover did not extend

• Decadal forecast 2012

  are shown as white curves, with red shading representing their probable range, such that the observations are expected to lie within the shading 90% of the time. The most recent forecast (thick blue curve with thin blue curves showing range) starts from November 2012. All data are rolling annual mean

• Bitterly cold nights ahead before milder conditions move in through the weekend

  night is expected tonight with temperatures dipping as low as -16°C where we have lying snow in Scotland and northern England. Temperatures will also be well below freezing across much of the UK so there is a continued risk of ice overnight and through Friday morning’s rush hour. “Milder air

• wales_-climate-met-office.pdf

  is linked closely with temperature, with falls rarely occurring if the temperature is higher than 4 °C. The numbers of days with snow falling and snow lying increase with latitude and altitude, so values reflect topography. Snow is comparatively rare near sea level in Wales, but much more frequent over

• wales_-climate-met-officepdf

  is linked closely with temperature, with falls rarely occurring if the temperature is higher than 4 °C. The numbers of days with snow falling and snow lying increase with latitude and altitude, so values reflect topography. Snow is comparatively rare near sea level in Wales, but much more frequent over

• Decadal forecast 2013

  , such that the observations are expected to lie within the shading 90% of the time. The most recent forecast (blue) starts from November 2013. All data are rolling annual mean values. The gap between the black curves and blue shading arises because the last observed value represents the period November

• Decadal forecast 2018

  , from the Coupled Model Intercomparison Project phase 5 (CMIP5), that have not been initialised with observations are shown in green. In all cases, the shading represents the probable range, such that the observations are expected to lie within the shading 90% of the time. The most recent forecast

• (Product name) for (Area)

  Station Based Monthly Planning Averages for LERWICK (Lat=60.14N Long=1.18W) 1-in-10 year values - based on station data between 1961 and 2020 Month Daily rainfall total (mm) Days with rainfall >5mm Days with air frost Days with snow lying at 0900 UTC January 206.1 18 15 12 February 170.7 14 16 12

• southern-england_-climate-met-office.pdf

  to February 2006, when about 75% of the normal rainfall occurred over the area, making it the driest such period since 1932/34. Snowfall The occurrence of snow is linked closely with temperature, with falls rarely occurring if the temperature is higher than 4 °C. For snow to lie for any length of time