FVAK20 PANC 191940 VAAAK0 VOLCANIC ASH ADVISORY - ALERT ALASKA AVIATION WEATHER UNIT NATIONAL WEATHER SERVICE ANCHORAGE AK ISSUED 1940 UTC MONDAY FEBRUARY 19 2001 BY ANCHORAGE VAAC VOLCANO: CLEVELAND/SMITHSONIAN NUMBER 1101-24/SEQUENCE NUMBER 01-01/AREA ALEUTIAN ISLANDS ALASKA/52 DEG 50 MIN N/169 DEG 57 MIN W/ HEIGHT 1730 METERS/5674 FEET SOURCES OF INFORMATION: AVO/SATELLITE IMAGERY ERUPTION DETAILS: SATELLITE INDICATION OF 191645 UTC ASH CLOUD DESCRIPTION: COMPOSITION UNKNOWN. EST HGT IS FL300 BASED ON INFORMATION RECEIVED FROM NESDIS. ASH CLOUD TRAJECTORY: TOP OF ASH PLUME MOVG NW APROX 25 KT.. LOWER ASH PLUME MOVG SE APROX 30 KT. 18 HOUR OUTLOOK: ASH PLUME EXPECTED TO STRETCH OUT AND BE LOCATED 50 NM EITHER SIDE OF A LINE FM 5500 N/17000 W TO 4700 N/16730 W. THIS IS BASED ON THE PUFF MODEL. ADDITIONAL INFORMATION: LOCAL AREA WINDS ARE UNDER 10 KTS AT THE SFC AND CLOUD COVER IS EXTENSIVE UP TO APPROXIMATELY FL100. NEXT SCHEDULED ADVISORY 0200 UTC 20 FEB 2001 UNLESS CONDITIONS WARRANT A SPECIAL ADVISORY. DSH FEB 2001 AAWU ===== FVAK20 PANC 192304 VAAAK0 VOLCANIC ASH ADVISORY - ALERT #2 ALASKA AVIATION WEATHER UNIT NATIONAL WEATHER SERVICE ANCHORAGE AK ISSUED 1940 UTC MONDAY FEBRUARY 19 2001 BY ANCHORAGE VAAC VOLCANO: CLEVELAND/SMITHSONIAN NUMBER 1101-24/SEQUENCE NUMBER 01-01/AREA ALEUTIAN ISLANDS ALASKA/52 DEG 50 MIN N/169 DEG 57 MIN W/ HEIGHT 1730 METERS/5674 FEET SOURCES OF INFORMATION: ALASKA VOLCANO OBSERVATORY/SATELLITE IMAGERY/ AND PIREPS ERUPTION DETAILS: CONTINUOUS ERUPTION SINCE 1500 UTC 19 FEB 2001. ASH CLOUD DESCRIPTION: ASH COMPOSITION UNKNOWN. ASH CLOUD APPEARS TO BE IN TWO DISTINCT LAYERS. TOPS OF LOWER LAYER REPORT BY PILOT AT FL100 AND MOVG SE. TOP OF UPPER LAYER EST AT FL250-300 MOVG NNW BASED ON SATELLITE INTERPRETATION AND PIREPS. AT 192112 UTC..PILOT REPORTS VOLCANO STILL PRODUCING A MUSHROOM CLOUD. ASH CLOUD TRAJECTORY: TOP OF ASH PLUME MOVG N-NW APROX 30 KT.. LOWER ASH PLUME MOVG SE APROX 30 KT. 18 HOUR OUTLOOK: ASH PLUME IS CURRENTLY LOCATED IN AN AREA FROM 5500N/17100W TO 4300N/16200W TO 5250N/17000W TO 5500N/17100W. THRU 18 HOURS IT IS EXPECTED TO ENCOMPASS AN AREA 100 NM EITHER SIDE OF A LINE FM 5800N/168W TO 4200N/16200W. ADDITIONAL INFORMATION: LOCAL AREA WINDS ARE UNDER 10 KTS AT THE SFC AND CLOUD COVER IS EXTENSIVE UP TO APPROXIMATELY FL100. LIGHT ASHFALL HAS BEEN REPORTED AT NIKOLSKI SINCE 192100 UTC. NEXT SCHEDULED ADVISORY 0500 UTC 20 FEB 2001 UNLESS CONDITIONS WARRANT A SPECIAL ADVISORY. DSH FEB 2001 AAWU =====