Document: 6850 | Created: 21:55 04/19/2021 UTC | Page: 01 Description: VOLC | Ash Cloud Forecast | Anchorage VAAC| _______________________________________________________________________ FVAK21 PAWU 191824 VAAAK1 VA ADVISORY DTG: 20210419/1822Z VAAC: ANCHORAGE VOLCANO: SEMISOPOCHNOI 311060 PSN: N5156 E17935 AREA: ALEUTIAN ISLANDS SUMMIT ELEV: 4006 FT (1221 M) ADVISORY NR: 2021/011 INFO SOURCE: HIMAWARI/GOES 17/AVO AVIATION COLOR CODE: ORANGE ERUPTION DETAILS: RESIDUAL VA FM 20210419/1500Z ERUPTION. OBS VA DTG: 19/1822Z OBS VA CLD: SFC/FL080 N5056 E17838 - N4825 E17837 - N4825 E17924 - N5058 E17927 - N5056 E17838 - N5056 E17838 MOV S 20KT. FCST VA CLD +6HR: 20/0022Z NO VA EXP. FCST VA CLD +12HR: 20/0622Z NO VA EXP. FCST VA CLD +18HR: 20/1222Z NO VA EXP. RMK: BREIF LOW-LVL ERUPTION AT SEMISOPOCHNOI YIELDING A VA SIGNAL. VA PLUME LARGELY DETATCHED FM VOLCANO SUMMIT AND APPEARS TO BE WKNG. NXT ADVISORY: WILL BE ISSUED BY 20210420/0022Z JAM APR 2021 AAWU FVAK21 PAWU 192034 VAAAK1 VA ADVISORY DTG: 20210419/2032Z VAAC: ANCHORAGE VOLCANO: SEMISOPOCHNOI 311060 PSN: N5156 E17935 AREA: ALEUTIAN ISLANDS SUMMIT ELEV: 4006 FT (1221 M) ADVISORY NR: 2021/012 INFO SOURCE: HIMAWARI/GOES 17/AVO AVIATION COLOR CODE: ORANGE ERUPTION DETAILS: NR CONTINUOUS LOW-LVL ERUPTIVE ACTIVITY. OBS VA DTG: 19/2032Z OBS VA CLD: SFC/FL080 N5202 E17922 - N5202 E17951 - N4650 E17925 - N4701 E17750 - N5202 E17922 MOV S 20KT. FCST VA CLD +6HR: 20/0232Z SFC/FL080 N5202 E17921 - N5202 E17951 - N4821 E17916 - N4839 E17805 - N5202 E17921. FCST VA CLD +12HR: 20/0832Z SFC/FL080 N5202 E17914 - N5202 E17952 - N4736 E17842 - N4738 E17744 - N5202 E17914 - N5202 E17914. FCST VA CLD +18HR: 20/1432Z NO VA EXP. RMK: NR CONTINUOUS LOW-LVL ERUPTIVE ACTIVITY AT SEMISOPOCHNOI. DISCRETE ERUPTIONS IDENTIFIED AT 19/1500Z AND 19/1950Z W/VA SIGNALS OBSERVED IN VARIOUS SATELLITE IMAGERIES. NXT ADVISORY: WILL BE ISSUED BY 20210420/0232Z JAM APR 2021 AAWU