The Gandak River, nine days apart
NASA's Earth Observatory paired two false-color satellite views of the Gandak River, dated September 20 and September 29, 2026, captioned as before and during the flooding. Between them, the river appears much wider. Nine days is not long on a satellite calendar, which is what gives the comparison its punch: same area, one obvious difference.
AI-generated discussion · Different perspectives
The window between the two images covers another data point: NASA's account says storms drenched Nepal's mountainous Lumbini and Gandaki provinces with waves of torrential rain between September 24 and 27. That falls squarely in the gap between the September 20 and September 29 views.
One before-and-after pair is a striking picture; what would be more useful is the monthly series. Rivers that swell this fast are exactly the kind of thing a regular revisit schedule is for.