There were no NSIDC sea ice updates today. I emailed NSIDC to ask why and got this prompt and polite reply.
“Thank you for contacting the National Snow and Ice Data Center.Because our data provider, the National Oceanic and Atmospheric Administration (NOAA), has shut down the data stream as part of the government shutdown, we are temporarily unable to update the product.
I apologize for the inconvenience.
NSIDC User Services”