Raindrops are falling on ..........

Dear Bloggers,

Last Saturday night I had to work and the weather forecast is not really something to write home about. The evening is peaceful and sometimes it rains a bit. After my break I drive from Heerenveen to Drachten on line 20 and it starts to rain harder and harder. When I drive from Drachten Leeuwarden starts to thunder. The horizon is fully illuminated by the flashes of lightning and it is still a beautiful natural picture.Als I start to drive back from Leeuwarden, the rain is downpouring from the sky and several streets are flooded with water. The harsh winds make my job as a driver quite interesting. Below you can read the forecast of last saturday.

Lots of rain is coming
For outdoor activities, the weather over the next two days is extremely precarious. In the back room we see with some feelings of pity precipitation calculations. It could well be that a number of Dutch regions soon 50-80 millimeters of rain gauges come. The first heavy rainfall moved through the Southeast today, within and tonight will gradually cover a significant part of the Netherlands. I think about that whole thing and then some hanging and some are very unstable in the air heavy rain and thunderstorms. And all because a bubble of cold air in the upper layers of the atmosphere in conjunction with the pile up of colder and warmer air.

Hole in the upper air
The 'source cause' of this wet weather is called a upper air hole. This is an area of about 5 to 10 km altitude, which is pretty cold, colder than over other areas in Europe. That well in recent days from the north pushed southward and is now over France and Switzerland at 5 km above the surface temperatures around -20/-21 degrees. Such an area with low temperatures leading to rising motion of air to the ground. The air at the ground as it were drawn up. And where air rises from the ground, forms a low pressure area. Since the heaviest lift movements on the east side of a pit place, are now low pressure zone over Switzerland, Germany and Luxembourg.

Slide over each other air masses
Besides the aforementioned 'hole' there is another physical phenomenon that will bring precipitation to our cause, namely that the different air masses meet. On the ground because a north wind blows, while at 1500 meters above ground on a north-easterly winds and 4 to 5 km altitude the wind blowing from the east. With winds from different directions, there is some height relatively warm air raised over a relatively less warm air flows / slides. The air on the ground from the North Sea (west of Denmark), the air at some height has its origins in Denmark and northern Germany. The air moves from the east over the relatively cooler air is thereby forced back and some extra lift. That bit of upliftment leads to an additional impetus for the formation of precipitation. In other words, partly arises and intensifies the rainfall over the country.

How much will fall?
As said before the afternoon and evening from the southeast progressively fewer locations rain (partly the result, partly within the slide). Then, the night almost anywhere in the rain. The expected rain tomorrow amounts to 08.00 hours vary mostly between 10 and 70 millimeters. Most of wetness in the western, central and southern expected.

Tomorrow during the day, it seems that the precipitation zone over the west and southwest will drag. In the central and more eastern parts of the country dry for some time, possibly with a faint sun there. Do arise in the unstable atmosphere just as several heavy showers, accompanied by reasonable chance of thunderstorms and hail. The expected rainfall will tomorrow daytime (from 08.00 to 20.00) between 5 and 25 millimeters vary. Thereafter it tomorrow and during the night to Tuesday in many places quite wet.

Then the precipitation zone over the western part of the country yet again, by becoming a land wind from west to east it will slide over us. This seems to happen Tuesday, Wednesday and then again from the same corner after a rain area in draws. In short, until Wednesday there will be locally heavy rainfall to come down. Who out again, doing well to the weather forecast to follow. In addition, this situation again in his sights very difficult to get. Small changes in positioning of the rain area, can have a huge impact on the expected weather.

For the first time in my life I'm glad I've come home again without any damage, when I crawl into bed enjoying the rain lashes the window. To get the sound of the humming of the motor out of my head I decided to watch some TV. To my surprise, there is only snow on the screen, a consequence of the last thunderstorm hit which ended with a large bang.

The Old Sailor,


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