Observing tips: Look west 30 to 60 minutes after sunset when the sun has dipped ~10 degrees below the horizon. If you see luminous blue-white tendrils spreading across the sky, you may have spotted a noctilucent cloud.
NOCTILUCENT CLOUDS INVADE THE USA: Summer is the season for noctilucent clouds. For sky watchers in the United States, “noctilucent summer” has just begun. On July 14th, a bright bank of electric-blue clouds rippled over the Canadian border into the USA. Greg Johnson of Seattle, Washington, photographed the display over the Puget Sound:
Dustin Guy of Seattle saw them too. “I witnessed the most vibrant NLC display that I’ve seen in a number of years,” he says. “They lit up the water of Lake Washington at 330 AM local time.”
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In the 19th century, you had to travel near Arctic latitudes to see these clouds. In recent years, however, they have been sighted as far south as Colorado and Kansas. The spread could be a result of climate change. July is usually the best month for NLCs. Sky watchers in the northern half of the USA should be alert for them for the next two weeks.
Observing tips: Look west 30 to 60 minutes after sunset when the sun has dipped ~10 degrees below the horizon. If you see luminous blue-white tendrils spreading across the sky, you may have spotted a noctilucent cloud.