SEARCH

SEARCH BY CITATION

image

Figure 1. After a mostly sunny New Year's Day, sunshine was at a premium during the quiet, mild spell that characterised the opening days of 2013. However, as the weather pattern changed, the 9th – the day before a 16-day cold spell began – was sunny over much of the country, as this visible image at 1229 utc (

courtesy of the University of Dundee

) illustrates. Cloud from a cold front did linger near the south coast, and there was convective cloud in the northwest and a few fog patches further south.

Download figure to PowerPoint

image

Figure 2. The snowy day of 19 January is depicted on page 82. Here, we focus on the end of the cold spell, showing the precipitation pattern at 2200 utc on 25 January (

courtesy of meteox.co.uk

). As deep depressions took over in the north Atlantic, strong winds, rain and snow spread from the west, giving blizzards in some northern and central regions, especially in the hills, but mostly only rain in the south. Later in the night there were icy surfaces as skies cleared over the cold ground.

Download figure to PowerPoint

image

Figure 3. The effect of deep cold air over relatively warm seas is highlighted in this image on the morning of 27 January, showing lightning activity over the past 24 hours (

courtesy of the Icelandic Met Office, from the UK’s lightning detection network

). There was an interesting thundery outbreak amongst widespread frontal rain over Wales, and locally further east, on the evening of the 26th, and thunder occurred in scattered locations over the British Isles on every day for the rest of the month.

Download figure to PowerPoint

image

Figure 4. This image for 2109 utc (

courtesy of the University of Dundee

) on 30 January shows the cloud that brought the penultimate rain area of a very wet last week of the month. It moved smartly eastwards across Northern Ireland, England and Wales during the night, and more slowly north across Scotland on the 31st. At the time of this image, there was heavy rain and some thunder over Ireland. Much convective cloud can be seen around 20°N, and heavy showers followed the rain area.

Download figure to PowerPoint