### Introduction
Cross-country flight planning relies on an accurate assessment not only of current weather, but also how the weather will change over over time and across the route of flight. Studying weather theory allows a pilot to understand why certain condition develop, and to make their own predictions about how the situation will evolve. Chapter 12 of the [[PHAK]] is a particularly good resource for understanding weather theory. In this lesson we'll learn how to obtain, process and understand pre-flight weather briefings, and use weather data.
**Pre-Lesson Reading/Homework:** [[~ PPL Pre-Lesson Reading]]
**Builds On:** [[PPL1.3 Weather Briefs and Preflight Planning]]
**Schedule:** Ground 1.5 hr
Practice on multiple flights
> [!note]
> Can be completed at the same time as with [[PPL4.6 Pilotage and Dead Reckoning]].
### Lesson Elements
> [!info]- Structure of XC Lessons...
> Lessons [[PPL4.2 Advanced Airport Operations|PPL4.2]], [[PPL4.3 Flight Planning, Navigation Systems, and Other XC Equipment|PPL4.3]], [[PPL4.4 Aircraft Performance and Weight+Balance|PPL4.4]], [[PPL4.5 Advanced Weather Briefs and Preflight Planning|PPL4.5]], & [[PPL4.6 Pilotage and Dead Reckoning|PPL4.6]] can be thought of as building out each part of a flight plan.
>
> ![[XC Syllabus Topics On Flight Plan.pdf]]
1. Weather and Weather Briefings
1. Weather theory -- see [[Aviation Weather Handbook]] for best resources
1. > [!youtube] Overview from [[King Schools]]
> 
2. [[Air Mass]]es and [[Front]]s
1. [[Winds Around Pressure Systems.svg]]
2. [[Isobars Reveal Pressure Gradient.svg]]
3. Warm, Cold, Stationary, and Occluded Fronts
> [!youtube] Published by [@KeithMeldahl](https://www.youtube.com/@KeithMeldahl)
> 
3. [[Atmospheric Stability]] ([[Temp Lapse Rates Effect on Stability.jpeg]]^[The 3°C per 1000ft is the dry adiabatic lapse rate and 0.5°C is the dew point lapse rate, used in this image. See Chap 12/13 of [[Aviation Weather Handbook]] for more info.])
1. "As air ascends through the atmosphere, the average rate of temperature change is 2 °C (3.5 °F) per 1,000 feet." - [[PHAK Ch12]]
2. [[Convective Turbulence Avoidance.jpeg]]
4. [[Thunderstorm]]s
5. [[Wind shear]]
6. [[Ice Hazards and Aircraft Icing|Ice]]
7. Other critical weather situations
2. Interpreting [[weather radar]]
3. Weather briefings in depth
1. Structure of weather briefings
2. Adverse conditions: [[TFR]]s, [[NOTAM]]s, [[SIGMET]]s, [[AIRMET]]s^[And other [[Inflight Aviation Weather Advisories]]], etc.
3. Current weather
4. Forecasts: [[Area Forecast Discussion]], [[TAF]]s, [[Winds Aloft]], [[MOS]]
4. Types of [[weather brief|weather briefings]] from Flight Service
1. Outlook
2. Standard
3. Abbreviated
5. [Too Much Weather: How to Choose Which Resource to Use and When](https://www.faa.gov/blog/clearedfortakeoff/too-much-weather-how-choose-which-resource-use-and-when) from the [[FAA]]
2. Review of [[All Available Information Concerning That Flight]]^[Similar to [[NWKRAFT]]]
1. Alternate selection
3. Other topics related to cross-country planning and flying
1. [[Human Factors]]
2. How to share expenses? [[AC 61-142]] and [[FAR 61.113 Private Pilot Privileges and Limitations]]^[Good WINGS program online [here](https://www.faasafety.gov/gslac/ALC/course_content.aspx?cID=1093)]
3. Flight Services Enroute
4. [[VFR]] flight plans for search and rescue
1. When to use them
2. How to file
3. How to activate and close
5. Estimating visibility in flight^[Some suggestions from [[AOPA]] in [this article](https://www.aopa.org/news-and-media/all-news/2008/april/flight-training-magazine/basic-vfr)]
### Completion Standards
Learner should develop working knowledge of weather theory, and understand sources of weather information for pre-flight planning.
### Resources
- [[Private Pilot ACS]] Sections I.C, I.D
- [[Aviation Weather Handbook]]
- [[AC 91-92]]
*Return to [[~ PPL Lesson Plan Outline|Table of Contents]]^*