// Station · 1h 4m ago · STALE

VLVT

Wattay International Airport

CAT MVFR

WIND CALM

VIS 3.1 SM

CEILING BKN at 5,000 ft

T/Td 27°C / 22°C

ALTIM 29.68 inHg

WX BR

ELEV 564 FT

17.9851°N / 102.5667°E

LOCATION · Vientiane, LA

WIND

000°0 kt

VLVT · 564 FT

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

METRIC

NOW · 16Z

+6H

+12H

+18H

WIND

CALM

VIS

3.1 SM

CEILING

BKN050

LAYERS

BKN050

T / Td

27 / 22

ALTIM

29.68"

// Interpretation

MVFR — visibility 3.1 SM. Winds calm, visibility 3.1 SM, broken at 5,000 ft. Reported weather: mist (BR). Mist is water droplets thinning visibility to between 5/8 and 6 SM — the moist, lighter cousin of fog. Would drop to IFR below 1,000 ft ceiling or 3 SM visibility, or rise back to VFR above 3,000 ft and 5 SM.

Loading TAF forecast narrative…

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

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// Raw observation METAR string + decoded

METAR VLVT 251600Z 00000KT 5000 BR BKN050 27/22 Q1005 NOSIG

VLVT · day 25 at 16:00 UTC · winds calm · visibility 3.1 SM · broken layer at 5,000 ft · temp 27°C / dewpoint 22°C · altimeter 29.68" Hg · weather: mist (BR)

// Runway analysis · computed from current METAR wind

Wind CALM

ALL USABLE · WINDS CALM

WIND

000°calm

HEADWIND CAUTION · HIGH XW AVOID · TAILWIND

ALL RUNWAYS · CALM WINDS 2 ends

13 HDG 130° —CALM —— 9,843'

31 HDG 310° —CALM —— 9,843'

Pattern altitude: 1,564 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 +14°C

2,400FT

+1,836 FT ABOVE FIELD ELEV

// DA · LAST 24 HOURS loading…

FIELD ELEV564 FT OAT+27°C ISA DELTA+14°C PRESSURE ALT806 FT

// Performance equivalent Operating here right now feels like operating at VLLN (Luang Namtha Airport, Luang Namtha, elev 1,968 ft) on a standard ISA day.

// Aircraft performance impact MODERATE

TAKEOFF ROLL CLIMB RATE

Single-engine propC172, PA-28, Cherokee

+24%

-17%

Turbo / high-perf pistonSR22T, Bonanza, Mooney

+17%

-11%

Light jetCJ4, Phenom 300, M2

+10%

-7%

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)

BKN050

Broken · base 5,000 ft AGL · ~5–7 oktas

// Computed

CEILING5,000 ft AGL HIGHEST LAYER5,000 ft TOTAL COVERAGE~75% (mostly covered) FREEZING LEVEL14,200 ft VFR MARGIN+2,000 ft

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

22:55ZSUNRISE

05:13ZSOLAR NOON

11:30ZSUNSET

11:52ZCIVIL END

CURRENT17:04Z DAYLIGHT REMAINING18h 26m VFR NIGHT BEGINS11:52Z (18h 48m) DAY LENGTH12h 34m

Waxing Gibbous

ILLUMINATION94% MOONRISE08:59Z MOONSET21:34Z FULL MOON IN2 days

// Nearest reporting stations

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

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