过去一小时，北京怀柔、密云、顺义降水明显

Group 1 - Beijing is currently under a red rainstorm warning, with significant rainfall reported in Huairou, Miyun, and Shunyi [1] - From 13:00 to 19:00 on August 4, the average rainfall across the city was 1.5 mm, with a maximum of 18.5 mm recorded at the Daguanyuan in Xicheng [3] - The strongest rainfall is expected to impact areas such as Miyun, Shunyi, and Pinggu, with localized hourly rainfall potentially reaching 20 to 40 mm [5] Group 2 - The Central Meteorological Observatory has issued an orange rainstorm warning and a blue warning for severe convective weather, covering Beijing [5] - Forecasts indicate that from 20:00 on August 4 to 20:00 on August 5, parts of Beijing, Tianjin, and the Liaodong Peninsula may experience heavy to torrential rain [5] - The chief forecaster from the Central Meteorological Observatory noted that while there may be a lull in rainfall, strong convective rain bands are expected to develop and strengthen overnight [6]