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Starlink 10-31 -

Falcon 9

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Valid Period

May 21, 2026 09:26 - 13:26 UTC (05:26 - 09:26 ET)

Issued

Wed May 20, 2026 at 13:00 UTC (09:00 ET)

Forecast Discussion

Space Launch Delta 45

Forecast Discussion: No major changes were made to the forecast today. An Atlantic surface high pressure nosed over southeast US continues to drive our local weather pattern. This feature will promote gentle to moderate east to southeasterly flow leading up to the day of launch. Despite this flow promoting moisture advection from the Atlantic, peak rain chances will be focused inland during the afternoon hours while the sea breeze boundary is displaced away from the east coast. A slow-moving disturbance over the Bahamas is helping supply this moisture and may also generate some convection in the early morning hours. These showers and associated clouds will be our main concern for violation of weather constraints on both the main and backup windows with focus on the Cumulus Cloud Rule. The latest high-resolution model runs currently note very little development of showers near T-0 leading to a slight improvement in POV values.

Primary Launch Date

Launch Day

Primary Window

90%
PGO

Primary Concerns

  • Cumulus Cloud Rule

Additional Risk Criteria

CriteriaRisk Level
Booster Recovery WeatherLow
Solar ActivityLow

Backup Opportunities

24-Hour Delay

Backup Window

85%
PGO

Primary Concerns

  • Cumulus Cloud Rule

Additional Risk Criteria

CriteriaRisk Level
Booster Recovery WeatherLow
Solar ActivityLow