Balloon Trajectory Forecasts

Which initial GFS model time?
The forecast is extracted from the Global Forecast System (GFS) which is run four times per day. The times listed are Universal Time.

Which forecast period?
The valid time for the forecast is the sum of the model initialization time and the forecast period.

What location?
  Latitude: Longitude:
Values must be decimal degrees with west negative.

Balloon Ceiling: meters

Calculate drop speed
  Gondola mass [kg]
  Chute diameter [m]
  Drag coefficient

Output Format: