ST. PATRICK'S DAY GEOMAGNETIC STORM: The strongest geomagnetic storm of the current solar cycle is underway now. Sky watchers in Scandinavia, Iceland, Greenland, Canada and all upper-tier US States should be alert for auroras after nightfall. As St. Patrick's Day came to an end in Maine, Northern Lights were visible even before the sky faded to black. The ongoing storm was sparked by the arrival of a CME during the early hours of March 17th (04:30 UT). The impact of the cloud rattled Earth's magnetic field, and in a matter of hours a severe G4-class (Kp=8) storm was underway. Skies turned shamrock-green over many US states including Iowa, Minnesota, Wisconsin, Montana, the Dakotas and Washington.