October 12, 2009
Update on Montserrat volcano activity
Clouds and more clouds over US made true color satellite imagery not very useful today.
Luckily over the Caribbean Sea we could get a very nice image of Montserrat volcano with MODIS Terra (top, left) where we can see more ashes than yesterday. OMI SO2 measurements as of 18:30 UTC are below (top, right).
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Air quality was moderate to unhealthy in the west coast and moderate in Louisiana and Georgia (AIRNow, below). A zoom in the Northwest shows the code orange/red that persisted until at least around 4pm PDT.
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EPA with its regional air quality partnership have forecasted clean conditions (code green) for tomorrow in Philadelphia/Wilmington area. What makes this code green so special? According to them, with exception of September 18 when Philadelphia reached moderate levels of PM's, good conditions are prevailing since August 27 which makes up for the longest streak of good air quality since their daily forecasts started in October 2003. Breathe easy!