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CRS-21 - L-1 Day

Falcon 9

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Valid Period

Dec 5, 2020 16:34 - 16:45 UTC (11:34 - 11:45 ET)

Issued

Fri Dec 4, 2020 at 13:00 UTC (08:00 ET)

Forecast Discussion

Space Launch Delta 45

Expect increasing cloud and shower coverage today and tonight as a low pressure system along the Central Gulf Coast slides into the Deep South. A weakening cold front is expected to push through Central Florida prior to the launch window Saturday, with most of the associated rainfall impacting the Spaceport Friday night and early Saturday morning. However, a measure of cloud cover may linger behind the front across Central Florida during the launch window. Primary weather concerns during the launch window will be the Cumulus Cloud Rule, and Thick Cloud Layer Rule. Behind the departing front, weak high pressure will move over Florida, maintaining mostly dry conditions across north and central portions of the state. However, a weak low pressure system will develop across the Central Gulf, which will potentially send an influx of mid-level clouds across the state Sunday. The primary weather concerns during the backup launch window will be the Thick Cloud Layer Rule and Cumulus Cloud Rule.

Primary Launch Date

Launch Day

Primary Window

50%
PGO

Primary Concerns

  • Cumulus Cloud Rule
  • Thick Cloud Layer Rule

Additional Risk Criteria

CriteriaRisk Level
Upper-Level Wind ShearModerate
Booster Recovery WeatherHigh
Solar ActivityLow

Backup Opportunities

24-Hour Delay

Backup Window

70%
PGO

Primary Concerns

  • Thick Cloud Layer Rule
  • Cumulus Cloud Rule

Additional Risk Criteria

CriteriaRisk Level
Upper-Level Wind ShearModerate
Booster Recovery WeatherLow
Solar ActivityLow