FVXX27 KWBC 201217 VOLCANIC ASH ADVISORY ISSUED: 2003JUN20/1200Z VAAC: WASHINGTON VAAC VOLCANO: MESSAGE TO USERS LOCATION: XX AREA: XX REMARKS: THE AIR FORCE WEATHER AGENCY IS ISSUING THIS MESSAGE ON BEHALF OF THE WASHINGTON VAAC. AFWA AND THE WASHINGTON VAAC ARE CONDUCTING A COORDINATED OPERATIONAL BACKUP TEST FROM 20/1200Z- 20/2000Z. PLEASE BE AWARE THAT AFWA WILL ISSUE ANY NECESSARY VOLCANIC ASH ADVISORIES ON BEHALF OF THE WASHINGTON VAAC DURING THIS TIME FRAME. NNNN