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KA-04 (Leo 4) - L-1 Day

Atlas V

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Valid Period

Dec 16, 2025 08:28 - 08:57 UTC (03:28 - 03:57 ET)

Issued

Sun Dec 14, 2025 at 18:30 UTC (13:30 ET)

Forecast Discussion

Space Launch Delta 45

A cold front will move across the Spaceport this evening, followed by strong high pressure building from the Midwest to the Ohio Valley on Monday. The pressure gradient between the departing front and the high building in will create windy conditions across the Spaceport this evening through Monday. These winds will quickly diminish Monday afternoon into the evening, as high pressure builds across the Southeast, helping to create mostly favorable weather conditions during the primary and backup launch opportunities.

Primary Launch Date

Launch Day

Primary Window

85%
PGO

Primary Concerns

  • Cumulus Cloud Rule

Additional Risk Criteria

CriteriaRisk Level
Solar ActivityLow

Backup Opportunities

24-Hour Delay

Backup Window

95%
PGO

Primary Concerns

  • Cumulus Cloud Rule

Additional Risk Criteria

CriteriaRisk Level
Solar ActivityLow