Possible volcanic ash emissions were reported for Santiaguito, but no ash plume was observed due to weather clouds as of 21 September 2026, 02:10 UTC. Forecasts suggest continued southeast movement of any ash through the next six hours.Original VAAC bulletin:FVXX22 at 02:56 UTC, 21/09/26 from KNESVA ADVISORYDTG: 20260921/0253ZVAAC: WASHINGTONVOLCANO: SANTA MARIA 342030PSN: N1445 W09133AREA: GUATEMALASOURCE ELEV: 12287 FT AMSLADVISORY NR: 2026/562INFO SOURCE: GOES-19. NWP MODELS. ERUPTION DETAILS: PSBL VA EMS EST VA DTG: 21/0210ZEST VA CLD: SFC/FL140 N1447 W09132 - N1440 W09126- N1437 W09132 - N1446 W09134 - N1447 W09132 MOVSE 5KT FCST VA CLD +6HR: 21/0800Z SFC/FL140 N1446 W09132- N1439 W09120 - N1434 W09126 - N1446 W09134 -N1446 W09132 FCST VA CLD +12HR: 21/1400Z NO VA EXPFCST VA CLD +18HR: 21/2000Z NO VA EXPRMK: VA EMS NOT OBS ON STLT DUE TO WX CLDS BUTEMS MAY CONT. NWP MDL SUG A GEN SE MVMT THRU T+6. ...EVANSNXT ADVISORY: WILL BE ISSUED BY 20260921/0900Z