FVXX27 KNES 191600 VA ADVISORY DTG: 20170519/1600Z VAAC: WASHINGTON VOLCANO: USER MESSAGE PSN: XX AREA: XX RMK: THE 557TH WEATHER WING IS ISSUING THIS MESSAGE ON BEHALF OF THE WASHINGTON VAAC. THE WASHINGTON VAAC IS CONDUCTING A SCHEDULED BACKUP. PLEASE BE AWARE THAT 557 WW WILL ISSUE ANY NECESSARY VOLCANIC ASH ADVISORIES ON BEHALF OF THE WASHINGTON VAAC UNTIL FURTHER NOTICE. NNNN