Appendix B. National Weather Service
(NWS) Radiosonde/HIBAL Flights
Use the procedures in this appendix for
National Weather Service (NWS) radiosonde balloon releases.
B-2. NWS RADIOSONDE
Issue as Aeronautical Information at least 30 minutes prior to the release
of a NWS radiosonde balloon under the following conditions:
Delayed Release. A radiosonde balloon that will be released later than the
scheduled times of 1130 or 2330 UTC.
Special Observations. A release that will be made at times other than those
specified for the scheduled observations (1130 or 2330 UTC).
The Aeronautical Information must contain the following information:
The balloon release time.
The time the balloon is expected to reach 10,000 MSL, using an average rate
of climb of 800 feet per minute.
The locations of radiosonde balloon release points are listed in the