The Defense Meteorological Satellite Program has been particularly important for understanding when a hurricane is about to rapidly intensify, a dangerous situation for coastal communities.

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NOAA’s Office of Satellite and Product Operations described the reason for turning off the flow of data as a need to mitigate “a significant cybersecurity risk.”

The three satellites have already operated for longer than planned.

The DMSP satellites were launched between 1999 and 2009 and were designed to last for five years. They have now been operating for more than 15 years. The United States Space Force recently concluded that the DMSP satellites would reach the end of their lives between 2023 and 2026, so the data would likely have gone dark soon.

Are there replacements for the DMSP satellites?

Three other satellites in orbit – NOAA-20, NOAA-21 and Suomi NPP – have a microwave instrument known as the advanced technology microwave sounder.

The advanced technology microwave sounder, or ATMS, can provide data similar to the special sensor microwave imager/sounder, or SSMIS, but at a lower resolution. It provides a more washed-out view that is less useful than the SSMIS for pinpointing a storm’s location or estimating its intensity.