// Station · 54m ago

VLLN

Luang Namtha Airport

CAT LIFR

WIND 090° / 2 kt

VIS 0.62 SM

CEILING OVC at 1,000 ft

T/Td 20°C / 20°C

ALTIM 30.12 inHg

WX BR

ELEV 1,968 FT

20.9670°N / 101.4000°E

LOCATION · Luang Namtha, LA

WIND

090°2 kt

VLLN · 1,968 FT

// Current + 24h forecast · METAR loaded · TAF loading…

METRIC

NOW · 01Z

+6H

+12H

+18H

WIND

090°/2

VIS

0.62 SM

CEILING

OVC010

LAYERS

OVC010

T / Td

20 / 20

ALTIM

30.12"

// Interpretation

LIFR — visibility 0.62 SM. Light winds at 090°/2 kt, visibility 0.62 SM, overcast at 1,000 ft. Reported weather: mist (BR). Mist is water droplets thinning visibility to between 5/8 and 6 SM — the moist, lighter cousin of fog. LIFR is the lowest standard category. Would improve to IFR above 500 ft and 1 SM.

Loading TAF forecast narrative…

SOURCES · NOAA Aviation Weather Center METAR (TAF loading…)

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// Raw observation METAR string + decoded

METAR VLLN 130100Z 09002KT 1000 BR OVC010 20/20 Q1020 NOSIG

VLLN · day 13 at 01:00 UTC · wind from 090° at 2 kt · visibility 0.62 SM · overcast at 1,000 ft · temp 20°C / dewpoint 20°C · altimeter 30.12" Hg · weather: mist (BR)

// Runway analysis · computed from current METAR wind

Wind 090° @ 2 kt

ALL USABLE · WINDS CALM

WIND

090°2 kt

HEADWIND CAUTION · HIGH XW AVOID · TAILWIND

ALL RUNWAYS · CALM WINDS 2 ends

18 HDG 180° —CALM —— 5,249'

36 HDG 360° —CALM —— 5,249'

Pattern altitude: 2,968 ft MSL (1,000 ft AGL). Verify pattern direction and altitude with the chart supplement before flying. // On calm winds (<3 kt), all runways are usable — favor the longest or whatever the pattern calls for.

// Density altitude · ISA +8°C

2,800FT

+832 FT ABOVE FIELD ELEV

// DA · LAST 24 HOURS loading…

FIELD ELEV1,968 FT OAT+20°C ISA DELTA+8°C PRESSURE ALT1,767 FT

// Performance equivalent Operating here right now feels like operating at VLSN (Sam Neua Airport, elev 3,281 ft) on a standard ISA day.

// Aircraft performance impact MINOR

TAKEOFF ROLL CLIMB RATE

Single-engine propC172, PA-28, Cherokee

+28%

-20%

Turbo / high-perf pistonSR22T, Bonanza, Mooney

+20%

-13%

Light jetCJ4, Phenom 300, M2

+11%

-8%

Approximate using ~10% perf loss / 1,000 ft DA for normally aspirated, scaled by powerplant type. Verify with your aircraft's POH for accurate numbers — especially above 5,000 ft DA where these rules of thumb diverge. Severity rating assumes a standard altimeter setting (29.92" Hg / 1013 hPa); a non-standard setting shifts the effective altitude by roughly 1,000 ft per 1" Hg of deviation.

// Cloud layers · 1 reported · highest to lowest

// Reported layers (highest → lowest)

OVC010

Overcast · base 1,000 ft AGL · 8 oktas

// Computed

CEILING1,000 ft AGL HIGHEST LAYER1,000 ft TOTAL COVERAGE~100% (overcast) FREEZING LEVEL12,069 ft VFR MARGIN-2,000 ft

// Sun & Moon · times in Z · bar = local day (UTC+7)

23:10ZSUNRISE

05:01ZSOLAR NOON

10:53ZSUNSET

11:16ZCIVIL END

CURRENT01:54Z DAYLIGHT REMAINING8h 58m VFR NIGHT BEGINS11:16Z (9h 21m) DAY LENGTH11h 43m

Waxing Crescent

ILLUMINATION3% MOONRISE00:32Z MOONSET12:16Z FULL MOON IN13 days

// Nearest reporting stations

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// Area map · 60 NM radius · CartoDB Dark Matter + aeronautical overlay

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