Why did London stop the weather forecast during World War II?

On May 9th, 1945, an exciting news came from The New York Times, USA: "Londoners have heard the weather forecast." Hehe, didn't Londoners have weather forecasts before? No, Londoners have weather forecasts. However, due to the confrontation between the two armies during World War II, in addition to the strength factor, the climate often plays a decisive role in the outcome of the war. The weather in Britain changes greatly, so does the probability of rainfall. Wet and foggy, it is often impossible to reach out during the day. In this case, Germans will be very tired if they want to enter Britain. Therefore, the "changeable" weather in Britain is an advantage of war. The weather in Britain can be called "top secret" in the war. The "weather forecast" has been blocked since then. It was not until yesterday, 60 years ago, that is,1May 9, 945, that the weather in Britain shed its mysterious cloak and became public information for the first time in several years. The British air force department announced the weather of the day: the whole territory was low in pressure, and the overall temperature felt warmer, sometimes accompanied by thunderstorms! In just a few words, the British and foreigners living in Britain have found a long-lost sense of security.