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Viasat 3F3 - L-1 Day

Falcon Heavy

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Valid Period

Apr 29, 2026 14:06 - 15:51 UTC (10:06 - 11:51 ET)

Issued

Tue Apr 28, 2026 at 15:15 UTC (11:15 ET)

Forecast Discussion

Space Launch Delta 45

Forecast Discussion: A north to south oriented area of high pressure will nose its way down the eastern seaboard today before centering offshore Florida into Wednesday. Available moisture is very limited to the lowest parts of the atmosphere, which should limit the threat for any more Atlantic showers the rest of today. Winds veer southerly or even south-southwesterly into Wednesday with the high settling southwards, with increasing mid-level moisture as an upper-level disturbance moves to the north. No significant precipitation threat is currently expected on Wednesday, but mid and upper-level cloud cover will be on the increase. The Thick Cloud Layers Rule will be the main concern for a Wednesday morning attempt. A very slow-moving front reaches North Florida Thursday morning with models considerably less progressive with this feature than in previous runs. Stronger offshore flow will limit east coast sea breeze development to well after the backup window, if at all, with the front too far north to provide a boost to shower development without additional daytime heating. The main concern for the backup opportunity will remain for Thick Cloud Layers Rule violations with the continuing upper jet and frontal induced mid-level cloudiness, though Cumulus Clouds may play a role late in the window with a few more hours of heating.

Primary Launch Date

Launch Day

Primary Window

90%
PGO

Primary Concerns

  • Thick Cloud Layers Rule

Additional Risk Criteria

CriteriaRisk Level
Booster Recovery WeatherLow
Solar ActivityLow

Backup Opportunities

24-Hour Delay

Backup Window

85%
PGO

Primary Concerns

  • Thick Cloud Layers Rule
  • Cumulus Cloud Rule

Additional Risk Criteria

CriteriaRisk Level
Booster Recovery WeatherLow
Solar ActivityLow