Sky watchers across northern Europe are reporting a vivid display of noctilucent clouds on July 31st. Nické Eriksson sends this sunset image from Karlstad, Sweden:
Noctilucent Clouds
© Nické Eriksson
"It reminded me of a magic carpet," says Eriksson.

Normally the coming of August signals a downturn in sightings of noctilucent clouds (NLCs). The northern noctilucent daisy is brightest in June and July. This year, however, might be different. So far, 2013 has been one of the best years ever for these strange clouds at the edge of space. Sightings could continue long after than usual end of NLC season.

Observing tips: Look west 30 to 60 minutes after sunset when the sun has dipped 6o to 16o below the horizon. If you see luminous blue-white tendrils spreading across the sky, you've probably spotted a noctilucent cloud.