There's a series of notifications regarding changes to forecast zones to occur on 30-Mar-2021.
SCN21-02 Updated: Changes to Public and Fire Forecast Zones for WFO
Columbia, SC, effective March 30, 2021
https://www.weather.gov/media/notification/pdf2/scn21-02cae_zone_changeaaa.pdfSCN21-03: Changes to Public Forecast Zones for Weather Forecast Office
Honolulu effective March 30, 2021
https://www.weather.gov/media/notification/pdf2/scn21-03hfo_zone_change.pdfSCN20-04: Changes to Public and Fire Forecast Zones for NWS Weather Forecast Office
Houston/Galveston, TX, effective March 30, 2021
https://www.weather.gov/media/notification/pdf2/scn21-04hgx_zone_change.pdfSCN21-05: Changes in Fire and Public Zones for NWS Weather Forecast Office
Jacksonville, FL, effective March 30, 2021
https://www.weather.gov/media/notification/pdf2/scn21-05jax_zone_change.pdfSCN21-06: Changes to Public and Fire Weather Zones for NWS Weather Forecast Office
New Orleans/Baton Rouge, LA, effective March 30, 2021
https://www.weather.gov/media/notification/pdf2/scn21-06lix_zone_change.pdfSCN21-07: Changes to Fire Weather Forecast Zones for NWS Weather Forecast Office
Miami, FL, effective March 30, 2021
https://www.weather.gov/media/notification/pdf2/scn21-07mfl_fwx_zone_change.pdfSCN21-08: Changes to Fire Weather Forecast Zones for WFO
Reno, NV, effective March 30, 2021
https://www.weather.gov/media/notification/pdf2/scn21-08rev_fwx_zone_change.pdfSCN21-09: Changes to Public Forecast Zones for WFO
Salt Lake City, UT, effective March 30, 2021
https://www.weather.gov/media/notification/pdf2/scn21-09slc_zone_change.pdfSCN21-05 Updated: Changes in Fire and Public Zones for WFO
Jacksonville, FL, for Clay, Duval and Putnam Counties in Florida, effective March 30, 2021
https://www.weather.gov/media/notification/pdf2/scn21-05jax_zone_changeaaa.pdfSCN21-03 Updated: Changes to Public Forecast Zones for Weather Forecast Office
Honolulu effective March 30, 2021
If your WFO is listed, check the associated PDF for changes in the zones -- you'll likely have to change the Forecast zone used for advforecast2.php and in nws-alerts if your current zone is changed. I'll keep this list up as more messages arrive from the NWS.
https://www.weather.gov/media/notification/pdf2/scn21-03hfo_zone_changeaaa.pdfEdit: add Jacksonville, FL notice
Edit: add Honolulu, HI notice