Flight Training - May 2012 - 40
WEATHER
By Jack Williams
TAFS ARE VALID for only a 5 statute mile radius around the airport of origin.
THUNDERSTORMS COME IN MANY FORMS
n March 29, 2011, the National Transportation Safety Board recommended the FAA work with the National Weather Service to revise AC 00-24B, Thunderstorms, by including explanations of the terms used to describe severe thunderstorms, such as “bow echo,” “derecho,” and “MCS.”
The letter resulted from NTSB investigations of fatal accidents that it blamed in part on pilots’ lack of understanding of the terms, used by meteorologists to describe espeWEATHER’S MANY SCALES Since the 1970s, meteorologists have cially dangerous been talking about these scales of weather phenomena: thunderstormrelated weather. • Microscale: approximately a mile or less across, such as turbulence “Pilots need to near a runway from wind blowing around nearby buildings and trees. be provided guid• Storm scale: phenomena 10 to 30 miles across, such as individual ance that explains scattered thunderstorms. • Mesoscale: systems up to a few hundred miles across. these terms • Synoptic-scale: systems more than a few hundred miles across, because without such as winter storms with fronts. such guidance, • Planetary scale: phenomena a thousand or more miles across or long, they will not such as upper-air jet streams that can circle the globe. be able to fully understand the weather condition information provided in convective outlooks and mesoscale information products—nor the effects such weather phenomena, such as rapidly changing winds, can have on the flying environment,” the NTSB said. The revision has yet to be made. It’s easy to see why students and instructors who rely on FAA weather texts—including the thunderstorms advisory circular, and the weather chapter in the Pilots’ Handbook of Aeronautical Knowledge—wouldn’t recognize those terms, because they apply to a scale of weather events FAA materials do not mention: the mesoscale.
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Flight Training - May 2012
Table of Contents for the Digital Edition of Flight Training - May 2012
Flight Training - May 2012
Weather
President’s Perspective
Right Seat
Letters
Working Class
How It Works
News Training Products
After the Checkride
News
Since You Asked
ASI News
News
News AOPA Action
Final Exam Member Products
Flying Carpet
You Were Ready for This
The Right Stuff
Jesse and David's Excellent Adventure
Technique
Checkride
Flight Lesson
Game Changer
Career Advisor
Tech Talk
Atta Boy!
What Is Stick-And-Rudder Flying?
Where Was I?
Advertiser Index
Debrief
Flight Training - May 2012 - Flight Training - May 2012
Flight Training - May 2012 - Cover2
Flight Training - May 2012 - 1
Flight Training - May 2012 - 2
Flight Training - May 2012 - 3
Flight Training - May 2012 - President’s Perspective
Flight Training - May 2012 - 5
Flight Training - May 2012 - Right Seat
Flight Training - May 2012 - 7
Flight Training - May 2012 - Letters
Flight Training - May 2012 - 9
Flight Training - May 2012 - Working Class
Flight Training - May 2012 - 11
Flight Training - May 2012 - How It Works
Flight Training - May 2012 - News Training Products
Flight Training - May 2012 - After the Checkride
Flight Training - May 2012 - News
Flight Training - May 2012 - Since You Asked
Flight Training - May 2012 - 17
Flight Training - May 2012 - ASI News
Flight Training - May 2012 - News
Flight Training - May 2012 - News AOPA Action
Flight Training - May 2012 - Final Exam Member Products
Flight Training - May 2012 - Flying Carpet
Flight Training - May 2012 - 23
Flight Training - May 2012 - You Were Ready for This
Flight Training - May 2012 - 25
Flight Training - May 2012 - 26
Flight Training - May 2012 - 27
Flight Training - May 2012 - 28
Flight Training - May 2012 - 29
Flight Training - May 2012 - The Right Stuff
Flight Training - May 2012 - 31
Flight Training - May 2012 - 32
Flight Training - May 2012 - 33
Flight Training - May 2012 - Jesse and David's Excellent Adventure
Flight Training - May 2012 - 35
Flight Training - May 2012 - 36
Flight Training - May 2012 - 37
Flight Training - May 2012 - Technique
Flight Training - May 2012 - 39
Flight Training - May 2012 - 40
Flight Training - May 2012 - 41
Flight Training - May 2012 - 42
Flight Training - May 2012 - Checkride
Flight Training - May 2012 - 44
Flight Training - May 2012 - 45
Flight Training - May 2012 - Flight Lesson
Flight Training - May 2012 - Game Changer
Flight Training - May 2012 - Career Advisor
Flight Training - May 2012 - 49
Flight Training - May 2012 - Tech Talk
Flight Training - May 2012 - Atta Boy!
Flight Training - May 2012 - Where Was I?
Flight Training - May 2012 - 53
Flight Training - May 2012 - Advertiser Index
Flight Training - May 2012 - 55
Flight Training - May 2012 - 56
Flight Training - May 2012 - 57
Flight Training - May 2012 - 58
Flight Training - May 2012 - 59
Flight Training - May 2012 - 60
Flight Training - May 2012 - 61
Flight Training - May 2012 - 62
Flight Training - May 2012 - 63
Flight Training - May 2012 - Debrief
Flight Training - May 2012 - Cover3
Flight Training - May 2012 - Cover4
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