Wednesday's weather in Estonia will stay colder than had been seen recently, with a move back to more wintry conditions seen starting Tuesday Maaleht reported.

A new study led by the University of Tartu suggests that anthropogenic aerosols may also influence clouds by converting cloud droplets to ice at temperatures below zero degrees Celsius.

Factories can trigger snow nearby - by "freezing" clouds ... Prof Toll, of the University of Tartu, Estonia, said: "Water freezes at zero degrees Celsius, right? "In fact, cloud droplets can ...

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"We ask those traveling in Tartu to be careful and not to venture to the riverside on the thin ice that has formed there. We recommend avoiding the riverside sidewalks," the agency said in a statement ...