Weather Flashcards
What is the difference between handling air carriers and GA aircraft in
bad weather?
Air carriers can generally handle encounters with adverse
weather much better than GA, air carriers are expected to
handle a certain amount of in-flight weather phenomena where
as GA are expected to avoid hazardous weather and exit the
conditions ASAP
What advantages do air carrier pilots and aircraft have over GA?
• 2 pilots, more experience in bad weather
• Must meet their equipage and engineering standards, airborne
weather radar (is not as good as ground radar), de-icing and
anti-icing equipment
Provide additional services to the extent possible contingent only
upon what?
• Higher priority duties, limitations to radar, volume of traffic,
frequency congestion, controller workload
• Additional services include weather dissemination
What are ATC responsibilities in regards to weather?
Be familiar with weather conditions when coming on duty and
stay aware while on duty, advise pilot of hazardous weather that
may impact operations within 150 NM of their sector, solicit
PIREPS, relay PIREPS in a timely manner, relay all operationally
significant PIREPS to the facility weather coordinator
When must you solicit PIREPS?
- When requested or weather is or is forecast to be:
- Ceilings at or below 5000 ft (include base and top)
- Visibility at or less than 5 miles (surface and aloft)
- Thunderstorms and related phenomena
- Turbulence (moderate or greater)
- Icing (light or greater)
- Wind shear
- Volcanic ash clouds
What would be considered an URGENT PIREP?
• Tornados, funnel clouds, waterspouts
• Severe or extreme turbulence (including CAT)
• Severe icing
• Hail
• Low level wind shear (within 2,000 ft of surface)
• Volcanic eruptions and volcanic ash clouds
• Any other weather phenomena reported which are considered
by you to be hazardous or potentially hazardous to flight
operations
What must the controller do when a PIREP is received?
Record, classify and disseminate when any of the above
conditions are reported
What should be recorded with a PIREP?
Time, aircraft position, aircraft type, altitude, icing type/intensity
and air temp in which icing is occuring
Who should you relay PIREPs to in a timely manner?
All concerned aircraft and weather coordinator
What is done with urgent PIREPs?
• Immediately broadcasted over the frequency and distributed via
local and national directives
• As a radar associate you are responsible to immediately ensure
that urgent PIREPS are forwarded to facility weather coordinator
by passing the information to your supervisor and then verbally
coordinating with other sectors/facilities that may be affected by
the hazardous weather
Define Urgent PIREP.
Weather phenomenon reported by a pilot which represents a
hazard or a potential hazard to flight operations
What should be issued when giving weather information?
• Pertinent information observed/reported weather or chaff areas
• Echo intensity when available- moderate heavy extreme
• Radar navigational guidance and or approve deviations around
weather or chaff areas when requested
• Weather and chaff information by defining the areas of coverage
in terms of azimuth and distance from aircraft
What should you do when a deviation cannot be approved as
requested?
• If situation permits suggest an alternate course of action
Who should receive PIREPs?
All affected pilots, controllers, and facilities
What actions are required by the controller?
• Advise pilots of hazardous weather that may impact operations
within 150 NM of their sector or area of jurisdiction
• Become familiar with and stay aware of current weather
conditions in your sector and surrounding sectors when coming
on duty and throughout your shift
• Issue pertinent weather information including echo intensity
when that information is available to the pilot on observed/
reported weather or chaff areas
How are forecasts of aviation weather differentiated?
By the target audience
Define AIRMET.
• A concise description of the occurrence or expected occurrence
of specified en route weather phenomena which may affect the
safety of aircraft operations, but at intensities lower than those
which require the issuance of a SIGMET
• Intended for the dissemination to all pilots in flight to enhance
safety and are particular concern to operators and pilots of
aircraft sensitive to phenomena described and to pilots without
instrument ratings
Define SIGMET.
• A concise description of the occurrence or expected occurrence
of specified en route weather phenomena which may affect
safety of aircraft operations
• Provides aircraft operators and crews notice of potentially
hazardous en route phenomena such as thunder storms and
hail, turbulence, icing, sand and dust storms, tropical cyclones,
and volcanic ash
• Intended for all pilots
What are convective SIGMETs issued for?
• Thunderstorms in the lower 48 states (other states regular
SIGMET)
Define CWA.
• Center weather advisory is an aviation weather warning for
conditions meeting or approaching national in flight advisory
(AIRMET SIGMET Convective SIGMET) criteria.
• An unscheduled in flight, flow control, air traffic, and crew
advisory. By nature of its short lead time the CWA is not a flight
planning product. It is generally a short term forecast for
conditions beginning within the next 2 hours
• Issued by national weather service at center weather service
units
What is a CWSU?
A joint FAA/NWS weather support team located in all en route
centers. The team consists of NWS meteorologists and FAA
traffic management personnel
When do you not have to broadcast to pilots of hazardous weather
within 150 NM?
When the aircraft on your frequency will not be affected
What should be done upon receipt of hazardous flight information
within commissioned HIWAS areas?
Broadcast a HIWAS alert on all frequencies except emergency
frequencies
What should be done upon receipt of hazardous flight information
NOT within commissioned HIWAS areas?
Advise pilots of the availability of hazardous weather advisories
with instructions to request further information from flight watch
or flight service
Define HIWAS.
A continuous recorded hazardous in flight weather forecast
broadcasted to airborne pilots over selected VOR outlets defined
as HIWAS broadcast areas
As a radar associate what is your responsibility in regards to receiving
SIGMETS, AIRMETS, CWAsetc?
• Must ensure the radar controller is made aware of them in a
timely manner
• Controllers must electronically acknowledge hazardous weather
information messages which may be received via the SIGMET or
GI views after appropriate action has been taken
What are the most hazardous icing conditions?
Encounters with freezing rain FZRA and freezing drizzle FZDZ
no aircraft is evaluated for these conditions
Can ground based weather radar and airborne weather radar systems
provide precise real time information on areas of ice?
NO
Icing forecasts are heavily dependent upon what?
PiREPS
What is structural icing? When does it form? And what are the 2
conditions necessary for it to form?
• Ice that forms on the surface
• +2 and -20 degrees c
• Visible moisture and temperature at which the moisture hits the
aircraft must be 0 degrees c or colder
When does icing occur?
365 days a year
How does structural icing affect an aircraft?
Reduces aircraft efficiency by either slowing the aircraft down or
forcing it downward