Section 3. Operations
OF SIGMETs, CWAs, AND PIREPs
CWSU meteorologist is the focal point for the review of SIGMETs to
determine application to the ARTCC area of responsibility and may
issue a CWA to modify or redefine the SIGMET information.
CWSU meteorologist may also issue a CWA in advance of a SIGMET when
the observed or the expected weather conditions meet SIGMET criteria
or when conditions do not meet SIGMET criteria but are considered
weather coordinator (WC) has the primary responsibility for the inter/intrafacility
dissemination of SIGMETs and CWAs and must ensure that sufficient
information is disseminated to facilitate the required alert
ATC facilities must relay the SIGMET and the CWA information to towers
under their jurisdiction.
WC is the focal point for handling PIREP requests and for the
dissemination of Urgent PIREPs within the ARTCC and to the terminal
ATC facilities without LSAS which are or may be affected.
CWSU meteorologist solicits PIREPs through the weather coordinator or
directly from the controllers when required. Both solicited and
unsolicited PIREPs that meet the Urgent PIREP criteria will be
distributed immediately via the Leased Service A System (LSAS).
classification: Categorize PIREPs as follows:
Weather phenomena reported by a pilot which represents a hazard or a
potential hazard to flight operations. Disseminate reports of the
following conditions as URGENT PIREPs:
funnel clouds, or waterspouts.
or extreme turbulence (including clear air turbulence).
level wind shear.
Defined as wind shear within 2,000 feet of the surface.
eruptions and volcanic ash clouds.
(g) Detection of sulfur gases (SO2 or
H2S), associated with volcanic activity, in the
The smell of sulfur gases in the cockpit may indicate
volcanic activity that has not yet been detected or
reported and/or possible entry into an ashbearing
cloud. SO2 is identifiable as the sharp, acrid odor of a
freshly struck match. H2S has the odor of rotten eggs.
other weather phenomena reported which are considered by the
specialist as being hazardous or potentially hazardous to flight
Classify as ROUTINE all PIREPs received except those listed above.
OF NOTAM DATA
traffic managers must coordinate with other air traffic facilities in
their area to ensure that adequate procedures are established for the
receipt and distribution of NOTAMs.
magnetic radials are used in planning airways/routes, conversion to
true radials is required for designation. The final magnetic radials
are not determined until the airspace action is charted. As a result,
differences from planned magnetic radials may occur in the conversion
of true to magnetic radials. Differences may also occur later due to
changes in the magnetic variation, which is recomputed every 5 years.
These differences could contribute to the misapplication of the VFR
altitude hemispheric rule. Therefore, ARTCC air traffic managers must
conduct a continuing review of the airway and jet route structures and
proposed new airspace cases and bring any differences to the attention
of the En Route and Oceanic Operations Service Area Office.
traffic managers must furnish personnel assigned Flight Data duties a
copy of FAAO JO 7110.10, Flight Service, and ensure they are
familiar with it.
TO MTR AND MOA PUBLISHED ACTIVITY SCHEDULES
ARTCCs must use the procedures as outlined in FAA
JO 7930.2, Notices to Airmen (NOTAM), Paragraph
612, Special Activity Airspace (SAA), when MTR
or MOA activity is scheduled to occur at other than
published or charted times.