April lived up to its name: Under the so-called “cold air drop” it rained more often, partly with local thunderstorms and a lower line of snow. Not much is left of it now: the full spring is really climbing again thanks to a southern exposure. A lot of sunshine, heat and dust of the Sahara (again!) Is the result until Friday. And after?
So far, April has been 0.4 degrees very hot in the middle of Germany compared to the average climate. But when we look at the map, we realize that there were big differences!
In the eastern half – but especially around the Bavarian border with the Czech Republic – temperatures in April have been very cold so far. In the west, on the other hand, positive anomalies (very hot) can be observed. At the southern ends we note a temperature deviation of about 1.0 degrees until yesterday (April 26). The anomalies are unlikely to change too much the rest of April.
Weather conditions for Thursday 28 April
The weather condition for Thursday afternoon is as follows: northwest of us is high, northeast of us is indicatively low. Between the two pressure structures, both the cold air from the north and the warm air from the south would reach us. However, since the highs and lows are further north, we are on the dry and hot side.
The equilibrium in the meteorological map (white lines), the lines of equal air pressure -in the case of high pressure- are very far apart, which speaks of a little wind and calm weather conditions with south flow. At an altitude of 1,500 m (850 hPa), warmer gas masses flow from the south. The remaining polar gas masses are still above northern Scandinavia and further north.
Here the isotherm of 0 degrees (air mass temperature) is above northern Germany and the air mass of 5 degrees is at the northern tip of the Alps. With sunshine and dry air, you can usually add about 15 degrees to the temperature of the air mass to get a rough estimate of the temperature on the ground. Then we would have around 15 degrees in the northern half and around 20 degrees in the south.
Weather forecast, Thursday (April 28) – Sunday (May 1)
A sunny and warm spring day awaits us on Thursday. After a cool night with low temperatures below 5 degrees, the intense sunshine warms the highs to 17 to 20 degrees. In the afternoon, individual clusters of clouds form over the mountains, which, however, hardly keep the sunshine away here.
Sahara dust again!
In addition, the Sahara sends us again sandy (and annoying?) Greetings: A thick pack of Sahara dust and sand is already announced at dusk on Thursday afternoon. On Friday, the sands of the Sahara are all there: A “cloud of dust from the Sahara” moves in a wide strip from North Africa along the Iberian Peninsula and France to Germany.
As a result, the sunshine is slightly cloudy (milky) – the risk of sunburn and sunburn is somewhat reduced by the concentration in the atmosphere. The south position will be closed at the weekend, so that the dusty air will gradually be washed away again by rainfall.
It is still very sunny on Friday. The sun shines most often in southeastern Germany. On the other hand, a dense cloud zone is approaching from the northwest and west. In the afternoon, at the latest in the afternoon, the clouds with the Sahara dust thicken in the south as well. With maximum temperatures from 18 to 21 degrees, the overall impression is spring and mostly beautiful (sunny).
At the weekend, the weather changes again: We enter more unstable layers of air (low pressure) and consequently increased rainfall.
This results in a lot of clouds on Saturday that will hardly give way to the sun. From the second half of the day it continues to rain from the dense clouds, which can be formed in less rainfall. It does not rain much, but in many places it gets temporarily wet! Depending on the activity and the duration of the rain, the temperature varies between 13 and 16 degrees.
In early May, dense clouds alternate with regional sunshine on Sunday. Usually, however, clouds are too present to allow the sun to shine for long periods of time.
In the morning and in the afternoon a shower season is formed, which is initially even further north than us and consequently overtakes us. The rains continue again and again. Maximum values are between 13 and 17 degrees.
Rainfall is up to 1 May
According to the GFS model, 1 to 15 liters per square meter of rainfall should reach the ground by Sunday afternoon. In the north sometimes nothing falls from the sky, in the south and at the edge of the Alps at least 5 to 15 l. In the Alps, 15 to 35 liters descend from the sky. Most of this rain falls on Saturday and the following night.
However, rainfall also has positive effects: Nature and the soil layers urgently need rain, and allergy sufferers can at least breathe relief when the Sahara pollen and dust are washed away by the atmosphere.