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    'Eruptive Pulse' of Chile's Calbuco Volcano Forces Evacuations

    By By Miguel Perez, AccuWeather En Español Staff Writer
    May 04, 2015, 4:26:23 AM EDT

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    Following back-to-back, major eruptions of the Calbuco volcano in southern Chile, which occurred for the first time in 42 years on April 22, the volcano registered a third eruptive pulse, or an explosive eruptive plume, Thursday.

    According to CIMAT - Early Warning Monitoring Information Center, Calbuco registered the third pulse of the eruption and forced preventive evacuations in the affected area.

    "Unlike eruptions last week, winds above the volcano directed ash from Thursday’s eruption to the east-southeast of the volcano and not toward Buenos Aires and Santiago,” AccuWeather.com Senior Meteorologist Kristina Pydynowski said.

    Through a new report issued Thursday, the National Emergency Office (Onemi) gave details on the number of evacuees and the effects the new eruptive pulse produced. Solid activity increased at 1:09 p.m. Thursday, Chilean time, according to the National Service of Geology and Mining (Sernageomin).

    Asífueel pulsoeruptivodel 30 de abrilde 2015 en el #VolcánCalbuco. Vía@Sernageomin pic.twitter.com/LjP1hD3Jau

    — Sernageomin(Chile) (@Sernageomin) May 1, 2015

    From a central mass of the volcano, a column of gas, consisting of steam and pyroclastic material was expelled. Due to increased Calbuco's volcanic activity, Onemi said it was necessary to evacuate people who were in an exclusion zone around 20 kilometers.


    Evacuees are residents of areas including Correntoso, Chapo Lake, Inlet, Colonia Tres Puentes and Waterfall. All were away from high-risk areas, according to the report. "However, if there is another eruption this weekend, a shift in the winds could carry the ash northward toward Buenos Aires and Montevideo, Uruguay. If this occurs, airline passengers should prepare for possible flight delays and cancellations," Pydynowski added.

    Volcanic ash is extremely dangerous to airplanes.

    First Calbuco Eruption in 42 Years Suspends Flights in Buenos Aires
    WATCH: Hiker Captures Dramataic Moment of Calbuco's Eruption
    VIDEO: Volcano Ash Covers Parts of Chile

    According to Thursday's release from the National Geology and Mining (Sernageomin) of Chile, the plume of Calbuco Volcano is low.

    AccuWeather.com Senior Meteorologist Kristina Pydynowski said a stable band of rain could develop during the first part of Friday.

    “Meanwhile, residents will also have to deal with steady rain through the first part of Friday with snow falling on the summit of the volcano. Rainfall will average 0.25 to 0.50 of an inch (6 to 12 mm) before tapering into a spotty shower for the afternoon. The rain threatens to combine with the ash to create dangerous debris flows, known as lahars," she said.

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