Chapter 9. FAA Weather Services
Section 1. General
9-1-1. PURPOSE
Surface meteorological observations are filed at scheduled and unscheduled intervals with stations having sending capability to WMSC for dissemination on the Service A domestic aviation weather system. These reports are aviation routine weather reports (METAR) and aviation selected special weather (SPECI). All reports will include a report type and the six-digit time of the observation. Computer sorting and validation requires exact adherence to format and procedure at all times.
9-1-2. SCHEDULED TRANSMISSION TIMES
a.METAR REPORTS. Prepare and code METAR reports for transmission between H+55 and H+00.
1.M1FC entry, use TA mask and specify H in the time field.
2.AISR entry, use /T procedures between H+46 and H+54. Use /D procedure between H+55 and H+00.
3.OASIS entry, use the Transmit Weather Observation dialog box. If the Hold box is checked, OASIS will hold the METAR report(s) until the listed METAR Transmit Time parameter.
b.SPECI AND DELAYED OR CORRECTED REPORTS. Transmit SPECI, delayed or corrected reports as soon as possible after H+00.
1.M1FC entry, use TA mask and leave the time field blank.
2.AISR entry, use /D procedure.
3.OASIS entry, use the Transmit Weather Observation dialog box, leaving the Hold box unchecked.
9-1-3. DISTRIBUTION
Most meteorological and NOTAM data exchanged outside of the facility is dependent on the Weather Message Switching Center Replacement (WMSCR). It is important to adhere to strict format and procedures during normal operations, as well as during system interruption periods.
a.Circuit interruption. Notify your tie-in facility, the AISR Customer Service Center, WMSCR and, if appropriate, the GS-200 Host facility of all outages. The M1FC AFSS facility should notify their FSDPS, AWP, and the appropriate telco servicing company. The OASIS AFSS facility should notify WMSCR and/or NADIN and the appropriate telco servicing company.
b.All outage reports should refer to the correct circuit and/or equipment identification numbers. Facilities should obtain and record ticket numbers provided by AISR or the telco authority.
c.AISR and WMSCR telephone numbers are as follows:
1.AISR HELPDESK 866-466-1336.
2.WMSCR (KNKAWMSC):
Atlanta 770-210-7931.
Salt Lake City 801-320-2045.
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