METAR Quiz: Decode and Read Aviation Weather Reports
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High-Frequency METAR Decoding Errors (and How to Stop Making Them)
Most wrong answers in METAR quizzes come from a small set of repeatable decoding traps. Fixing them is less about memorization and more about reading each group in the correct context (U.S. vs international format) and knowing which groups drive operational decisions.
Mixing up wind direction rules
- Confusing VRB with a variable range: VRB03KT means direction is variable at 3 kt; 180V240 is a direction range appended when variability criteria are met.
- Over-reading gusts: In 23012G22KT, “12” is the steady speed; “G22” is the peak gust value, not an average.
- Misunderstanding calm: 00000KT is calm winds, not “wind from 000°.”
Visibility and RVR unit slips
- Assuming everything is statute miles: U.S. METARs often use SM, but international METARs may use meters (e.g., 9999).
- Ignoring RVR variability/tendency: R06/1200V1800FT varies between 1200 and 1800 ft; R23/0600U includes a trend (U = upward).
Ceiling misinterpretation
- Calling SCT a ceiling: Only BKN, OVC, or VV establish a ceiling. SCT020 BKN040 has a ceiling of 4,000 ft AGL.
- Forgetting AGL vs MSL context: METAR cloud heights are reported as hundreds of feet AGL (e.g., BKN040).
Temperature/altimeter decoding shortcuts that backfire
- Missing the “M” sign: M02/M06 is −2°C / −6°C, which changes icing and frost risk assessment.
- Misreading altimeter precision: A2992 is 29.92 inHg; Q1013 is 1013 hPa—don’t mix unit systems mid-brief.
METAR Decode-At-a-Glance Reference (Print-Friendly)
Print note: This reference is designed to be printable—use your browser’s print option to print or save as a PDF for offline study.
Canonical METAR order (what to expect, left to right)
- Type: METAR or SPECI
- Station: ICAO identifier (e.g., KJFK)
- Time: DDHHMMZ (UTC/Zulu)
- Modifier: AUTO, COR (as applicable)
- Wind: dddff(f)GggKT or VRBffKT; calm = 00000KT
- Visibility: U.S. typically xSM (fractions allowed); “P6SM” = more than 6 SM
- RVR (if reported): Rrr/####FT, optional V#### variability and U/D/N tendency
- Present weather: intensity + descriptor + phenomena (e.g., -SHRA, +TSRA, FZFG)
- Sky condition: FEW/SCT/BKN/OVC + height (hundreds of ft AGL) + type (CB/TCU when applicable); vertical visibility = VV###
- Temp/dew point: TT/DD in °C; M = minus (e.g., M03/M07)
- Altimeter: A#### inHg (U.S.); Q#### hPa (international)
- Remarks: begins with RMK (U.S.-specific detail often lives here)
Ceiling rule (quiz-critical)
Ceiling = the lowest layer reported as BKN, OVC, or VV. FEW and SCT are not ceilings.
Wind quick reads
- 23012G22KT = wind from 230° (true), 12 kt sustained, gusts 22 kt
- dddVddd = direction varies between two values (e.g., 180V240)
Pressure conversion (when you must switch units)
- inHg ≈ hPa × 0.02953
- hPa ≈ inHg ÷ 0.02953
Present weather code structure (read from left to right)
- Intensity: - (light), no symbol (moderate), + (heavy)
- Descriptors (examples): TS (thunderstorm), SH (showers), FZ (freezing), BL (blowing)
- Phenomena (examples): RA (rain), SN (snow), DZ (drizzle), FG (fog), BR (mist)
Operational METAR Drills: Decisions Driven by Wind, Ceiling, and RVR
Use these short prompts to practice the same “decode → interpret → decide” workflow the quiz expects. Read the METAR group, extract the operationally relevant number, then state the decision impact in one sentence.
Drill set (answer out loud or in writing)
- Crosswind + gust factor: You see 27015G25KT with runway 22 in use. What are the sustained vs gust speeds, and what’s your immediate crosswind/gust planning adjustment?
- Calm-wind trap: A night departure shows 00000KT 1/2SM FG VV002. What does the wind group actually mean, and what is the ceiling you must treat as controlling?
- Ceiling misread: METAR includes SCT020 BKN040. What ceiling is reported, and why is the SCT layer not the ceiling?
- RVR variability: Landing runway 06 with R06/1200V1800FT. What is the lowest RVR you must plan against, and what does the “V” change operationally?
- RVR trend letter: Departure runway 23 shows R23/0600U. What does the “U” mean, and why shouldn’t it substitute for the actual minimum value in a go/no-go decision?
- Freezing risk from temp/dew: METAR contains M02/M06 with -DZ. What is the temperature, and what hazard does light drizzle below freezing imply for surfaces and airframe?
- International visibility: You’re reading a non-U.S. METAR that shows visibility 9999. What does that represent, and why is it not “9,999 meters exactly”?
- Altimeter/QNH switch: You receive Q1013 while configured to set inches of mercury. What conversion step do you take before setting your altimeter, and what error are you preventing?
Self-check rule: If you can’t point to the exact characters in the report that drove your decision (e.g., “BKN,” “VV,” “V,” “U,” “M”), re-decode before you commit.
Five METAR Skills That Transfer Directly to Checkrides and IFR Ops
- Extract the controlling values: treat the lowest RVR in a variable group and the lowest BKN/OVC/VV layer as the operational limit, not the “best-case” number.
- Separate sustained wind from gusts: in dddSSGggKT, plan performance and handling for the steady speed and the gust spread (gust minus steady).
- Don’t invent ceilings: FEW and SCT describe coverage but do not create a ceiling; ceilings come only from BKN/OVC/VV.
- Guard your unit system: visibility may be SM or meters, pressure may be A#### (inHg) or Q#### (hPa); one wrong assumption can cascade into a wrong minima or altimeter setting.
- Read the sign on temperature/dew point: the “M” changes the entire icing/frost interpretation and often explains why fog/stratus persists near the field.
METAR Decoding Glossary (with Mini Examples)
- METAR
- A routine aerodrome weather observation in a standardized coded format. Example: “METAR KDEN 231753Z …”
- SPECI
- An unscheduled special observation issued for significant changes between routine reports. Example: “SPECI KATL 231712Z …”
- Wind group (dddff(f)GggKT)
- Wind direction (degrees, rounded to the nearest 10) and speed in knots; optional gusts. Example: “23012G22KT” = 12 kt sustained, gusts 22 kt.
- VRB
- Wind direction is variable (not a fixed direction). Example: “VRB03KT” = variable direction at 3 kt.
- Prevailing visibility
- The dominant visibility value reported for the airport surface observation. Example: “3SM” = 3 statute miles.
- 9999 visibility
- International code indicating visibility is 10 km or more. Example: “9999” means ≥10,000 m, not exactly 9,999 m.
- RVR (Runway Visual Range)
- Measured visibility along a specific runway, typically in feet in U.S. METAR. Example: “R28L/2600FT” = 2,600 ft RVR on runway 28L.
- RVR tendency (U/D/N)
- Trend of RVR: Up, Down, or No change. Example: “R23/0600U” = 600 ft and improving.
- Ceiling
- The height AGL of the lowest BKN/OVC layer or VV (vertical visibility). Example: “SCT020 BKN040” ceiling is 4,000 ft AGL.
- M (minus) in temperature/dew point
- Indicates below 0°C. Example: “M02/M06” = −2°C / −6°C.
Authoritative References for METAR Format, Coding, and Decoding
- FAA Aeronautical Information Manual (AIM), Chapter 7 Section 1Includes the FAA “Key to Aerodrome Forecast (TAF) and Aviation Routine Weather Report (METAR)” and related weather reporting guidance.
- FAA-H-8083-28A Aviation Weather Handbook (FAA landing page)FAA’s consolidated weather reference, with METAR decoding and operational interpretation.
- FAA-H-8083-28A Aviation Weather Handbook (PDF)Downloadable handbook for offline study and note-taking.
- NOAA Aviation Weather Center (AWC) — Data HelpOfficial NOAA overview of METAR content and how AWC presents observational datasets.
- NWS METAR/SPECI Code Format with Remarks (WSOH)National Weather Service reference showing coded groups and common remarks conventions used in surface aviation observations.
METAR Decoding FAQ: Wind, Visibility, RVR, Ceiling, and International Differences
In 23012G22KT, what number is the steady wind speed?
12 kt. The wind group is read as direction (230°), sustained speed (12), and then optional gusts (G22). Treat gusts as peak values that can affect control inputs and landing distance, but they do not replace the sustained wind speed when the question asks for “steady.”
What’s the difference between VRB03KT and 180V240?
VRB03KT means the wind direction is variable (not a stable direction) at 3 knots. 180V240 is a separate variability range appended to a directional wind (e.g., 21010KT 180V240) to show the wind is fluctuating between two directions; it’s not a substitute for the main wind group.
What does 00000KT actually tell you?
Calm wind. It is not “wind from 000 degrees.” In calm conditions, crosswind isn’t the issue—your attention typically shifts to low visibility, runway contamination, and the possibility of fog or localized wind shifts not captured in the calm average.
How do you interpret 9999 visibility in international METARs?
Visibility of 10 km or more. It’s a threshold code, not a precise distance. The quiz often targets this because pilots accustomed to U.S. “SM” formatting may mistakenly read it as “9,999 meters” instead of “≥10,000 meters.”
What does the “U” mean in R23/0600U, and does it let you use a higher value?
U = upward tendency (improving RVR). It does not replace the reported value for decision-making. You still plan against the controlling number (here, 600 ft), and you use the trend to anticipate whether conditions are improving or degrading while you coordinate timing and alternates.
Which cloud amounts count as a ceiling in METAR reporting?
Only BKN (broken), OVC (overcast), or VV (vertical visibility) define a ceiling. FEW and SCT provide cloud coverage context but do not establish the ceiling used for flight category and many IFR operational decisions.
