NASA is hoping to launch a new infrared space observatory on Friday, but cloudy weather could delay the flight.

The Wide-field Infrared Survey Explorer (WISE) is slated to lift off atop a Delta II rocket from Vandenberg Air Force Base in California on Dec. 11 between 9:09:33 a.m. and 9:23:51 a.m. EST (1409 and 1423 GMT).

Unfortunately, thick clouds and rain are forecasted, prompting NASA to give the weather an 80 percent chance of preventing the launch. Even if liftoff is delayed for 24 hours, the forecast looks to be similar.

“We’ve got some challenging weather ahead of us,” said launch director Chuck Dovale during a Wednesday briefing.

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