IMD has warned of heavy to moderate rain in Delhi-NCR through Sept 6, with thunderstorms and below-normal day temperatures. The Yamuna has crossed the danger mark, forcing closures at Old Railway Bridge and disrupting cremations at Nigambodh Ghat. Himachal and Uttarakhand face extremely heavy rain risk; Punjab has shut all educational institutions until Sept 7. Flights are disrupted as airlines caution travelers.