Forecast for Thursday, April 20

Issued: Tuesday, April 18 Launch Weather Officer: 45th Weather Squadron Synoptic Discussion: "Gusty westerly winds to 25 knots will continue through early afternoon associated with a frontal boundary approaching Central Florida this afternoon. The weak boundary will stall in South Central Florida Tuesday evening and remain over the peninsula through launch day. There is a small chance of an isolated thunderstorm throughout the MLP roll and launch opportunities associated with the quasi-stationary boundary. "For the MLP roll on Wednesday expect East winds gusting to 15 knots. "For launch day, a broad area of lower pressure persists over Central and North Florida. Expect West winds through mid-afternoon becoming Easterly gusting to 18 knots during the window. There is a chance of isolated showers and a small chance of an isolated thunderstorm associated with the boundary located over the peninsula. "The primary concerns for launch day are thick clouds and disturbed weather associated with the boundary. Proton flux for 10 MeV energetic particles is forecast at normal background levels. "Conditions remain similar in the event of a 24 hour delay with thick clouds and disturbed weather the principle concerns." Clouds: Strato-Cumulus Scattered at 2,500 feet with tops at 4,500 feet; and Cirrus Broken at 25,000 feet with tops at 28,000 feet Visibility: 7 miles Launch Pad Winds: Easterly from 090 degrees at 12 to 18 knots Temperature: 78-82 degrees F Relative Humidity: 70 percent Weather: Isolated Showers Solar Activity: Low Probability of Violating Weather Constraints: 30 percent Concerns: Thick clouds associated with isolated showers and disturbed weather

Forecast for 24-hour delay

Friday's Probability of Violating Constraints: 30 percent Concerns: Thick clouds associated with isolated showers and disturbed weather

Times of note

Thursday's launch window: 4:27-7:16 p.m. EDT (2027-2316 GMT) Friday's launch window: 4:22-7:16 p.m. EDT (2022-2316 GMT)