NOUS41 KWBC 161520 PNSWSH Service Change Notice 21-30 National Weather Service Headquarters Silver Spring MD 320 PM EDT Tue March 16, 2021 TO: Subscribers:     -NOAA Weather Wire Service     -Emergency Managers Weather Information Network     -NOAAPort     Other NWS Partners and Employees FROM: Captain James Crocker, NOAA      Director, Surface and Upper Air Division Office of Observations SUBJECT: NWS Upper Air Station at Chatham, MA, to permanently close