As "Gemei" gradually weakens and dissipates, the residual water vapor will begin to run to the northeast of China from tomorrow, which will bring a large wave of rain to this area. Tomorrow, there will be a very deep westerly trough in the western part of North China moving eastward, this westerly trough is not simple, it can attract the monsoon water vapor from the south to run up, and on the other hand, it can also make the subtropical high temporarily shrink back, so that the high-pressure dam in the Beijing-Tianjin-Hebei region is not so hard, and the rain belt can also go north smoothly.
Speaking of which, we have to talk about these numerical forecasts, which are still a bit different in terms of rainfall forecasts in northern China. United States numerical forecasts have predicted relatively obvious precipitation holes in eastern Shanxi, southern Hebei, western and northern Shandong, which means that there may not be much rain in these places. The European numerical forecast is more uniform, and there will be rain in almost the whole of North China. As for our domestic forecasts, we still prefer to refer to European numerical forecasts, so the rainfall area is reported more extensively.
But having said that, the Beijing-Tianjin-Hebei and Shandong regions have been very hot recently, and this rain may have a strong convective nature, that is, the kind of showers and thundershowers, and the rainfall in some areas may not be as much as forecasted, so you have to be psychologically prepared.
Now that Gemei has weakened, but its remnants of water vapor are still doing something here, let's take a good look at what happens next. People in the North and Northeast China, you have to take precautions against the rain. Especially in those places that are prone to water accumulation, you must clean the drainage system in advance to avoid rainwater coming and turning your home into a swimming pool.
Speaking of rainfall in North China, we have to mention the westerly trough. This thing is like a guide, carrying the water vapor north. And it's also very good at playing a strategy, attracting water vapor while squeezing out the subtropical high, so that the rain belt can move north unimpeded. However, this matter is not so simple, after all, the weather is unpredictable.
Going back to numerical forecasting, the forecast in the United States says that it may not rain much in eastern Shanxi, southern Hebei, western and northern Shandong, but rather as if a hole has been dug. The forecast for Europe is even more even, with rain falling in almost all of northern China. At present, our domestic forecasts are more inclined to European numerical forecasts, so the rainfall area is quite extensive.
However, you also have to know that the temperature in Beijing-Tianjin-Hebei and Shandong has been quite high recently, and the rainfall may have a strong convective nature, that is, the kind of showers and thundershowers, and the rainfall in local areas may not be as much as forecasted, so you must be psychologically prepared. Remember to bring an umbrella when you go out, don't get wet by this sudden heavy rain!