The 17,800 foot volcano, Popocatepetl, that forms part of the SE ring of mountains around Mexico City let off a huge plume of ash Friday morning. We are in the WSW part of the city, so no ash has reached us (yet?). Popocatepetl is not dormant but is almost always blowing jets of steam. Its neighbor, Itzacihuatl, also in the 17,000 foot range, is dormant and has been for many years.
Even without the ash in the sky, Mexico City's air is so dirty right now that we can't see the mountains. So we didn't see the ash plume, but yesterday on the drive home the gray air looked darker to the south (towards the volcano), and it looked like the dirtiness had hit an air wall (like you could see where the upper winds picked up the ash).
http://conexiontotal.mx/2011/06/03/despierta-el-popo-y-emite-fumarola-habra-lluvia-de-ceniza/
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