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CHAPTER 5:  SECOND-RELEASE PROCEDURES

A. FAILURE OF FLIGHT TO REACH 400MB

There are many circumstances that may occur that will require a second release.  For example, the RRS system may not detect release of the sonde.  The sonde or ground equipment may fail prior to the balloon reaching 400 hPa.  The balloon may be forced down due to icing or leak gas and fail to reach 400 hPa.

If the flight has failed to reach 400 hPa, the RWS system will provide a warning stating that the flight failed.  Follow the dialog boxes to power down the UPS and end the first flight.  Click on “File” -> “New Flight.”  A window will pop up asking if you want to proceed with a second release for this flight time.  Click “Yes.”  

The remaining steps for a second release are generally the same as for any other flight.  However, there are a couple of minor differences and things to keep in mind.

B. NEW FREQUENCY

A different frequency must be selected for the new sonde.  Refer to Table 1.1 for the appropriate wires to cut.  During the baseline process, the new frequency must be manually entered in the TRS Display.  DO NOT CLICK “SCAN.”   Using Scan may cause the SPS to lock onto the original sonde and not the new one.  To enter the frequency, click the “Set” button.

C. LAUNCH WINDOW

For the standard synoptic release times of 00z/12z, the launch windows are 2300-0029 UTC/1100-1229 UTC.  For special releases, the launch window begins 30 minutes prior to observation time, as opposed to 1 hour for a standard release.  For example, the launch window for an 18z release would be from 1730-1829 UTC.  Any release beyond the launch window will have the next synoptic hour assigned to it.

D. SEND NEW TAP

If a TAP is required, a new one must be sent out 15 minutes prior to the new release.

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