Forecast for Tuesday, June 27

Issued: Sunday, June 25 Launch Weather Officer: 30th Weather Squadron Synoptic Discussion: "A low pressure center West of San Francisco becomes stationary with an elongated trough stretched across the Eastern Pacific. Energy associated with this system coupled with moisture from the South creates broken layers of mid and upper cloud. A weak surface eddy South of the Channel Islands will decay during the early afternoon having little effect on range weather. A dominant Southwesterly flow in the lower levels persists over the Central Coast, and surface winds remain Southwesterly at 10 - 15 knots while marine layer stratus dominates. Upper level winds are light and Southerly at 25 - 30 knots." 24 Hour Scrub Forecast: "The low moves little overnight and the associated trough tracks only slightly Eastward. The marine layer will continue to dominate with very low ceilings and visibility during the evening and overnight hours, while surface winds stay Southwesterly at 10 - 15 knots. Mid and upper levels dry out with winds Southerly 20 - 25 knots." Clouds: Stratus at 200 feet and tops at 1,200 feet with 8/8ths sky coverage; Altocumulus at 17,000 feet and tops at 21,000 feet with 5/8ths sky coverage; Cirrus at 35,000 feet and tops at 37,000 feet with 3/8ths sky coverage Visibility: One-half mile Launch Pad Winds: Southwesterly from 220-250 degrees at 10 to 15 knots Temperature: 55 to 60 degrees F Weather: Fog Probability of Violating Weather Constraints: 20 percent Concerns: Thick clouds and liftoff winds

Forecast for 24-hour delay

Wednesday's Probability of Violating Constraints: 10 percent Concerns: Liftoff winds