Forecasts made within AvnFPS are sent by a transmission server. When you press the OK button in the Send Dialog, the content of the forecast editor is split into separate TAFs which are then put in the transmission queue (that is, written to a file in the directory xmit/pending). The transmission servers checks the queue every N seconds. When the transmission time is reached, the forecast is disseminated. The transmission server will then notify all instances of AvnWatch whether the transmission succeeded. The AvnWatch's Queue button will flash for a while and the status of the transmission will be displayed in the Status Bar at the bottom of the Monitor. If the transmission fails, the Queue button will change its color from green to red. You can view the status by clicking on the button. This will display the Transmission Queue Dialog, see Section 2.2, “Server Status Indicators”. To retransmit a forecast, select the bad option, highlight the failed entry (listed in the bottom window), and press Retransmit. The forecast will be moved back to the pending queue and the transmission server will attempt to send it again.

	Note
	The transmission server does not actually transmit the forecast. It simply invokes AWIPS utility handleOUP.pl and checks for the return status. If the forecasts are not transmitted, one should check handleOUP.pl log file, on the system where the server runs. Most likely it will be px2.

Important

If you scheduled a forecast to be transmitted at a future time, you can easily pull it from the queue if changing weather condition warrant its modification. Any time you load a forecast into the editor, it checks whether there is a similar TAF waiting in the pending queue. If so, it is pulled out from the queue and loaded into the editor. So, you always can modify a forecast, even if AvnFPS is restarted.

The transmission server collects information on forecasts sent by the WFO for verification purposes. A product with WMO ID header NXUS98 CCCC, where CCCC is your site id, is sent every 6 hours over the WAN where its collected as part of the Stats-On-Demand service.