Significant cold has returned to much of Europe following a mild stretch, paving the way for outbreaks of snow through at least the start of next week.
Icy and snow-covered roadways will disrupt ground travel in some areas.
Air traffic will be subject to flight delays and cancellations.
Much of central and western Europe will have days of temperatures running 10 to 15 degrees F below normal.
Widespread snow, locally heavy, will fall in U.K., Germany, the Low Countries and France, to name a few.
Even in southern Europe, parts of Italy, Spain and the Balkan Peninsula, will be subject to potentially heavy snow.
One storm, ponderous and "double barreled," will dump a foot or more of heavy mountain snow, between Wednesday and Friday, over an area from the Pyrenees region of Spain and France, through much of Italy, eastward into such Balkan lands as Croatia, Bosnia and Hercegovina, Serbia, Montenegro and Greece.
Some lowland cities, in Italy and elsewhere, will also get heavy snowfall.
Another storm may lay down heavy snow Friday and Saturday in a swath over U.K. and France to the western Alps.
The cold, unsettled weather could drag on well into next week as well.
The first shot of snow hit the U.K. early Monday before spreading to the Low Countries, western
Germany and northern France overnight and Tuesday, when the instigating storm began to reorganize over the northwestern Mediterranean basin.
New snowfall in the city of Amsterdam, Netherlands, covers the statue of a pious woman, according to the AP caption. Snowfall as of Tuesday, Jan. 15, was 5-6 cm, or about 2 inches. (AP Photo/Peter Dejong)
The plum rains are known as "meiyu" in China, the "baiyu" or "tsuyu" in Japan, and the "jangma" in the Koreas. The heart of the plum rain season stretches from early June to mid-July, with a tendency to shift south to north across the affected area.
In the wake of the mid-June cloudbursts, most of Pakistan to northwestern India last week saw a return to dry, hot weather typical of the weeks leading up to the Monsoon onset. It was as if the Monsoon withdrew to its "normal" position for the latter half of June.
The 38.5 degree C (101 degrees F) reading Tuesday in Ajaccio, Corsica, may have been tops in Europe.
Monsoon Onset was June 13th, 2013, in Delhi, almost two weeks earlier than average. The June 15th onset at Karachi and Islamabad was more like three week ahead of schedule.
In Pakistan, hit-or-miss downpours missed the Sindh capital, Karachi. One did hit Pad Idan, where it left 60 mm of rain Wednesday. This was more than 20 times greater than the normal June rainfall.
It is still possible that this scenario is over wrought as to the intensity and spread of rain in Pakistan and northwestern India. However, it is the hunch of the present forecaster that some very unusual weather is going to unfold in the Subcontinent during the next week!