August 19, 2014

Smoke over the Northern Plains; Dust over the Southern

The EPA AQI loop, below left, shows areas of Moderate AQI across the Mid-Atlantic, Great Lakes, Southeast, Mississippi Valley, and southern Plains, as well as the Pacific Southwest, the Pacific Northwest, the northern Rocky Mountain, and the northern Plains. Spots of Unhealthy for Sensitive Groups are also visible in northern California and Idaho before disappearing in the evening, with the Idaho patch reaching Unhealthy before dropping. The HMS fire and smoke imagery, below right, shows smoke over northern California, the northern Rockies and Plains, the Great Lakes, and the Mid-Atlantic, which may be related to the higher AQIs in these regions.

The smoke plume over the northern Plains is visible in the MODIS Terra image below left. The NRL NAAPS forecast, below right, shows sulfates may be behind the elevated AQIs in the east and southeast, while dust may be responsible for those in the south.

Posted by John Sullivan at August 19, 2014 11:59 PM
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