the visibility
must be observed and forecast to be 5 nautical miles or greater;
the peak
wind speed, regardless of direction, may not be observed or forecast
to exceed 20 knots;
the peak
cross wind shall not be observed or forecast to exceed 15 knots,
12 knots at night. If the mission duration is greater than nine
days, the limit is 12 knots, day or night;
an observed
or forecast cloud ceiling must be 10,000 feet or higher;
observed
scattered cloud layers below 10,000 feet must not exceed 2/10 sky
coverage;
landing
in or near precipitation is not acceptable;
the deorbit
burn shall not occur if thunderstorm, lightning, or precipitation
activity is observed within 30 nautical miles of the Shuttle Landing
Facility;
detached
opaque thunderstorm anvils less than three hours old must not be
observed or forecast to be within 20 nautical miles of the Shuttle
Landing Facility, or within 10 nautical miles of the flight path
when the orbiter is within 30 nautical miles of the runway.