Private Pilot · Chapter 9 of 14

Aviation Weather Services

12 free practice questions from the 325 in this chapter of StudyWren Aviation. Pick an answer and check it to see the explanation and its FAA source. Part of the free Private Pilot practice test.

Weather Briefings PAR-09-017

You complete your weather briefing entirely online through 1800wxbrief.com. Which element of a standard voice briefing will you NOT receive from this online self-briefing?

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The answer is C: The briefer's "VFR flight not recommended" advisory

The Aviation Weather Handbook notes that the VNR advisory is not provided via the internet. A self-briefing pilot must judge for themselves whether conditions make VFR flight doubtful. Online briefings still include forecasts and NOTAMs.

Source: FAA-H-8083-28B Sec. 3.3.1.1 ACS PA.I.C

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In-Flight Weather Sources PAR-09-021

Many FSSs use remote communications outlets (RCOs) that share one frequency at several locations. When calling through an RCO, what should you include so the specialist uses the correct transmitter?

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The answer is B: Your location or the name of the outlet, and the frequency you expect a reply on

Because an FSS may transmit on the same frequency from more than one location, the AIM asks pilots to state their location and the frequency on which they expect a reply (for example, "receiving Decatur one two two point three").

Source: AIM 4-2-3 ACS PA.I.C

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METAR & SPECI Decoding PAR-09-061

METAR KABQ 182152Z 27018G27KT 10SM TS SCT080CB BKN150 28/M01 A3008 RMK AO2 LTG DSNT NW TSB38 TS SW MOV NE SLP067 T02831011 In the body of this report, what does "TS" by itself indicate?

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The answer is C: A thunderstorm without precipitation at the station

TS may be coded alone when a thunderstorm has no associated precipitation, a dry thunderstorm. With precipitation it is combined, as in TSRA. Distant lightning is reported in remarks as LTG DSNT.

Source: FAA-H-8083-28B Sec. 24.4.3.8.3 ACS PA.I.C

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Pilot Weather Reports PAR-09-095

OKC UA /OV IRW270015/TM 1832/FL065/TP C172/SK SCT030-TOP050/TA 08/TB LGT/RM DURD What do /FL065 and /SK SCT030-TOP050 indicate?

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The answer is B: Altitude 6,500 MSL; scattered layer, bases 3,000 and tops 5,000 MSL

Altitudes in PIREPs are in hundreds of feet MSL unless otherwise noted. The /SK group gives cloud cover, base and top (TOP), also MSL. Pilots report altitudes from the altimeter, which reads MSL.

Source: FAA-H-8083-28B Sec. 24.5.1.4 Sec. 24.5.1.6 AIM 7-1-14 ACS PA.I.C

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Terminal Aerodrome Forecasts PAR-09-116

TAF KGRI 180520Z 1806/1906 13012KT P6SM BKN120 WS015/22045KT FM181400 18015G25KT P6SM SCT050 FM181900 21018G28KT 5SM -SHRA BKN035 TEMPO 1821/1823 P6SM NSW SCT040 FM190100 28010KT P6SM SKC What does the TEMPO group mean?

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The answer is C: From 2100 to 2300 UTC the showers will temporarily stop; visibility over 6 SM

NSW (no significant weather) is used only in a TEMPO group. It shows when significant weather from a previous group, here -SHRA, is temporarily expected to end. Only the elements that change temporarily are included.

Source: FAA-H-8083-28B Sec. 27.4.2.7 Sec. 27.4.2.10.2 ACS PA.I.C

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Graphical Forecasts for Aviation PAR-09-140

The Aviation Clouds Forecast shows broken clouds with bases at 045 over an area where the terrain is about 1,500 feet MSL. About how high above the ground are the forecast bases?

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The answer is A: About 3,000 feet AGL

The Aviation Clouds Forecast gives cloud heights in hundreds of feet MSL, unlike METAR and TAF heights, which are AGL. 045 is 4,500 feet MSL, and 4,500 - 1,500 = 3,000 feet AGL.

Source: FAA-H-8083-28B Sec. 27.5 ACS PA.I.C

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AIRMETs & G-AIRMETs PAR-09-146

AIRMET Tango is issued for which conditions?

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The answer is A: Moderate turbulence, sustained surface winds of 30 knots or more, and LLWS

AIRMET Tango describes moderate turbulence, sustained surface winds of 30 knots or more, and non-convective low-level wind shear potential below 2,000 feet AGL. Severe turbulence and severe icing are SIGMET phenomena.

Source: FAA-H-8083-28B Sec. 26.3.1.2 AIM 7-1-6 ACS PA.I.C

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SIGMETs & Convective SIGMETs PAR-09-174

A Convective SIGMET polygon is shown on your EFB map. What should you understand about it?

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The answer is A: It is a snapshot at issuance; storms keep moving with the stated movement vector

The polygon outlines the area or line of thunderstorms at the H+55 issuance time. During the valid time, the area moves according to the movement vector. Fast-moving storms may end up outside the polygon before the next update.

Source: FAA-H-8083-28B Sec. 26.2.4.2 ACS PA.I.C

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Winds & Temperatures Aloft Forecast PAR-09-185

An FB forecast gives 9,000 ft: 3020+02 and 12,000 ft: 3232-04. Using linear interpolation and rounding direction to the nearest degree, what wind and temperature would you expect at 11,000 feet?

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The answer is A: About 313° at 28 knots, minus 2 °C

11,000 feet is two-thirds of the way from 9,000 to 12,000. Direction: 300 + (20 × 2/3) ≈ 313°. Speed: 20 + (12 × 2/3) = 28 knots. Temperature: +2 + (-6 × 2/3) = -2 °C. Taking the midpoint (310°, 26 knots, -1 °C) treats 11,000 as halfway, a common error.

Source: FAA-H-8083-28B Sec. 27.2.1.1.1 ACS PA.I.C

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Surface Analysis Chart PAR-09-205

A station model on a surface analysis chart shows a pressure tendency of -15 with a falling symbol. What does it indicate?

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The answer is C: Sea level pressure has fallen 1.5 mb over the past 3 hours

The pressure trend gives the change in sea level pressure over the past 3 hours in tenths of millibars, plus a symbol showing how it changed. -15 is a fall of 1.5 mb in 3 hours.

Source: FAA-H-8083-28B Sec. 25.2.3.4.9 ACS PA.I.C

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Prognostic & Significant Weather Charts PAR-09-210

On the Low-Level SIGWX chart, how are areas of IFR and MVFR conditions depicted?

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The answer is B: IFR enclosed by a solid line; MVFR by a scalloped line; VFR not outlined

IFR areas are outlined with a solid (red) line and MVFR areas with a scalloped (blue) line. VFR areas are not depicted. Colors may vary by website or provider.

Source: FAA-H-8083-28B Sec. 27.9.1.2.1 ACS PA.I.C

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Radar & Satellite PAR-09-231

An animated radar loop shows blotchy echoes that "bloom up" and fade randomly with no continuity of motion, while real showers nearby move steadily. What are the blotchy echoes most likely to be?

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The answer is A: Anomalous propagation (AP), false ground echoes from a bent radar beam

AP is an extended pattern of ground echoes caused by superrefraction bending the beam to the ground. When animated, AP blooms up and dissipates randomly, while thunderstorms move with a smooth, continuous motion.

Source: FAA-H-8083-28B Sec. 15.2.13 ACS PA.I.C

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