Forecast for Thursday, December 7

Issued: Monday, December 4 Launch Weather Officer: Kathy Winters, 45th Weather Squadron Synoptic Discussion: "A cold front is moving through Central Florida causing low clouds, fog, and isolated areas of light rain. Weather will clear behind the front this evening as high pressure builds in to the north, bringing cooler weather for the rest of the week. The boundary will be over South Florida on launch day and will migrate back toward Central Florida the following two days causing higher winds, a low cloud ceiling, and a chance for isolated showers. "Our primary concern for launch day is a low cloud ceiling." Clouds: Stratus scattered at 3,000 feet with tops at 4,500 feet and 3/8ths sky coverage; Altostratus scattered at 8,000 feet with tops at 10,000 feet and 3/8ths sky coverage; and Cirrus broken at 20,000 feet with tops at 22,000 feet and 5/8ths sky coverage Visibility: 7 miles Launch Pad Winds: Northwesterly from 330 degrees at 10 gusting to 15 knots Temperature: 58 degrees F Relative Humidity: 77 percent Weather: None Probability of Violating Weather Constraints: 20 percent Concerns: Low cloud ceiling

Times of note

Thursday's launch window: 9:31-9:41 p.m. EST Thursday's target liftoff time: 9:35:45 p.m. EST Friday's launch window: 9:08-9:18 p.m. EST Friday's target liftoff time: 9:13:13 p.m. EST Saturday's launch window: 8:42-8:52 p.m. EST Saturday's target liftoff time: 8:47:31 p.m. EST

Forecast for 24-hour delay

Friday's Probability of Violating Constraints: 60 percent Concerns: Low cloud ceiling, isolated showers, winds at launch pad 39B and crosswinds at Shuttle Landing Facility

Forecast for 48-hour delay

Saturday's Probability of Violating Constraints: 60 percent Concerns: Low cloud ceiling, isolated showers, winds at launch pad 39B and crosswinds at Shuttle Landing Facility