GEOMAGNETIC STORM: A minor (Kp=5) geomagnetic storm is in progress as Earth enters a stream of solar wind flowing from a coronal hole on the sun. High-latitude sky watchers should be alert for auroras.
PERSEID FIREBALLS: New research by NASA's Meteoroid Environment Office shows that among all annual meteor showers the Perseids are the #1 source of fireballs. The first Perseid fireballs of 2013 are arriving now. Earth is entering a stream of debris from parent comet 109P/Swift-Tuttle, and meteoroids are hitting the top of the atmosphere at 135,000 mph. Petr Horálek photographed this Perseid streaking along the backbone of the Milky Way over Úpice, Czech republic, on August 3rd:
The maximum is coming. Meteor rates should remain low for the next week as Earth penetrates the sparse outskirts of the debris stream, then skyrocket to ~100 meteors per hour as the calendar turns to the second week of August. Forecasters expect maximum Perseid activity on the nights of August 12-13. [meteor radar] [NASA: Perseid fireballs].