Hazards of online dating
The spokesman added: "As skies clear on Thursday night there is also potential for widespread ice to form quite rapidly on untreated surfaces.
"As a developing area of low pressure moves east across southern Britain on Thursday there is potential for rain to turn rapidly to snow as cold air is drawn in.
"There is a chance of snow settling with disruption to road, rail and air services as well as interruptions to power supplies and other utilities - this more likely across East Anglia and southeast England.
"Associated heavy rain and strong winds may prove additional hazards." The updated warning refers to a slight increase to the risk of disruption from snow, and says ice could also present a hazard.
The Thera volcanic events and subsequent ashfall probably sterilized the island, as occurred on Krakatoa.
Only the Mount Tambora volcanic eruption of 1815, Lake Taupo's Hatepe eruption around 180 CE, and perhaps the Baekdu Mountain eruption around 970 CE released more material into the atmosphere during historic times.
Heavy rain and strong winds could also worsen the conditions.
The northern part of the caldera was refilled by the volcanic ash and lava, then collapsed again.
The Minoan eruption of Thera, also referred to as the Thera eruption or Santorini eruption, was a major catastrophic volcanic eruption with a Volcanic Explosivity Index (VEI) of 6 or 7 and a dense-rock equivalent (DRE) of 60 km It devastated the island of Thera (now called Santorini), including the Minoan settlement at Akrotiri and communities and agricultural areas on nearby islands and the coast of Crete with a related earthquake and tsunami.
There are no clear ancient records of the eruption, which may have inspired certain Greek myths, Geological evidence shows the Thera volcano erupted numerous times over several hundred thousand years before the Minoan eruption.
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This "key plan" indicates coverage of the Goad 1901 series of fire insurance maps of Glasgow that were originally produced to aid insurance companies in assessing fire risks.
On Santorini, there is a 60 m (200 ft) thick layer of white tephra that overlies the soil clearly delineating the ground level before the eruption.