Document: 6850 | Created: 21:55 04/19/2021 UTC | Page: 01
Description: VOLC | Ash Cloud Forecast       | Anchorage VAAC|
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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