STS-100 Launch Day Weather Forecast 19 Apr 2001

ISSUED: Thursday, April 19, 2001

VALID: Thursday, April 19, 2001 2:41 p.m. EDT

Synopsis: Surface high pressure over the southeast will bring northeast to
east surface winds; an upper level ridge of high pressure will create dry,
stable conditions aloft.

At the 2:41 p.m. launch time on Thursday:

Clouds: Few cumulus, scattered, 2/8 sky coverage at 4,000 – 7,500 feet

Scattered cirrus, 3/8 sky coverage at 25,000 – 28,000
feet

Visibility: 7 + miles

Wind at the launch pad: NE / 10 – 15 knots

SLF: NE /
9-14 knots

Temperature: 72 degrees – Dewpoint: 54 degrees

Relative Humidity: 53%

Weather concerns: slight chance of RTLS crosswind violation at SLF

Probability of weather prohibiting launch: 10%

24-hour delay: 10%

48-hour delay: 10%

Solid Rocket Booster Recovery Area:

Wind: N/8-10 knots Seas: 2 – 3 feet Water Temperature: 75 degrees

Sunrise: 6:54 a.m. Sunset: 7:51 p.m.

Launch forecast by USAF45th Weather Squadron, Cape Canaveral Air Force
Station

SLF Wind Forecast by National Weather Service Space Flight Meteorology
Group, JSC