Lesson 10 Weather Cont Flashcards
What is the objective of the lesson?
To introduce weather information services and how to interpret aviation weather reports and forecasts prepared by the National Weather Service
What are the three steps in the forecasting process?
- Observation of raw data
- Processing of raw data in one place
- Dissemination of data
What does OCTA stand for and what does it do?
OCTA shoots lasers that divide the sky into 8 pieces to determine sky conditions
Define persistence forecast.
A forecast based on the current weather continuing
What is a trend forecast?
Assumes a weather system will continue a track and speed
What is a climatological forecast?
Based on weather norms for an area
What is an analogue forecast?
Uses historical weather charts to compare with current weather conditions
What is a METAR?
An observation of current surface weather reported in an international format
How often are METARs issued?
On a regularly scheduled basis unless significant weather changes occur
What is a special METAR (SPECI)?
Issued at any time between routine METAR reports due to significant weather changes
What does TAF stand for?
Terminal Aerodrome Forecast
What is the validity period for a TAF?
24-30 hours
What are AIRMETs?
Inflight weather advisories to all general aviation aircraft
What categories can AIRMETs be classified into?
- Tango: turbulence
- Zulu: moderate icing
- Sierra: IFR conditions
What is a SIGMET?
Inflight advisories concerning non-convective weather that is potentially hazardous to all aircraft
What does a Convective SIGMET describe?
Hazardous convective weather affecting the safety of flights
What are the three types of briefings provided by Flight Service Stations?
- Standard
- Abbreviated
- Outlook
What is the Surface Analysis Chart?
Issued every 3 hours, depicts general weather conditions including isobars and pressure systems
What does the Radar Summary Chart depict?
Computer-generated image of radar echoes and severe weather watch areas
What types of images do satellites provide for pilots?
- Visible
- Infrared
- Water Vapor
What is AWOS?
Automated Weather Observing System
What is the primary weather observation system in the US?
ASOS - Automated Service Observing System
What does the ATIS provide?
Recorded airport information including active runways and special instructions
What is the purpose of a weather check?
To determine the safety of flight and be aware of potential hazards during flight
