National Weather Service United States Department of Commerce

Tropical Storm Arthur and Heavy Rainfall in the South; Severe Weather in the Midwest

An outbreak of severe thunderstorms is expected across portions of Illinois and Indiana tonight. Intense tornadoes, swaths of damaging gusts, and hail in excess of 2 inches in diameter possible. Tropical Storm Arthur will continue to produce strong winds across coastal Upper Texas and Louisiana tonight, as well as potentially life-threatening flooding across southern Louisiana into Mississippi. Read More >

This is a loop of 3.9 micron satellite imagery. This is a near-infrared channel that is sensitive to temperatures.

The image at 0130Z (530 pm PST) shows a black spot at Mt St Helens, indicating very warm temperatures. The subsequent images show the cooling of the volcano, as well as the drifting ash cloud to the east.

Ash plume on satellite image loop