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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