// Station · 2h 10m ago · STALE

VTCN

Nan Airport

CAT VFR

WIND 170° / 4 kt

VIS 6+ SM

CEILING Few/scattered only

T/Td 28°C / 25°C

ALTIM 29.59 inHg

ELEV 685 FT

18.8079°N / 100.7830°E

WIND

170°4 kt

VTCN · 685 FT

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

METRIC

NOW · 13Z

+6H

+12H

+18H

WIND

170°/4

VIS

6+ SM

CEILING

—

LAYERS

FEW030 SCT045

T / Td

28 / 25

ALTIM

29.59"

// Interpretation

VFR with light winds at 170°/4 kt. Visibility 6+ SM and a few at 3,000 ft, and scattered at 4,500 ft. Would shift to MVFR if the ceiling drops to 3,000 ft or visibility below 5 SM.

Loading TAF forecast narrative…

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

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// Raw observation METAR string + decoded

METAR VTCN 111300Z 17004KT 130V200 9999 FEW030 SCT045 28/25 Q1002 NOSIG

VTCN · day 11 at 13:00 UTC · wind from 170° at 4 kt · visibility 6+ SM · a few clouds at 3,000 ft · scattered layer at 4,500 ft · temp 28°C / dewpoint 25°C · altimeter 29.59" Hg

// Runway analysis · computed from current METAR wind

Wind 170° @ 4 kt

ALL USABLE · WINDS CALM

WIND

170°4 kt

HEADWIND CAUTION · HIGH XW AVOID · TAILWIND

ALL RUNWAYS · CALM WINDS 2 ends

02 HDG 020° —CALM —— 6,562'

20 HDG 200° —CALM —— 6,562'

Pattern altitude: 1,685 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 +15°C

2,800FT

+2,115 FT ABOVE FIELD ELEV

// DA · LAST 24 HOURS ↗ +500 FT

24h AGO18h12h6hNOW

FIELD ELEV685 FT OAT+28°C ISA DELTA+15°C PRESSURE ALT1,016 FT

// Performance equivalent Your aircraft will perform as if it's at a field 2,800 ft high on a standard ISA day — that's +2,115 ft above VTCN's actual elevation.

// 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.

// Cloud layers · 2 reported · highest to lowest

// Reported layers (highest → lowest)

SCT045

Scattered · base 4,500 ft AGL · ~3–4 oktas

FEW030

Few · base 3,000 ft AGL · ~1–2 oktas

// Computed

CEILING— HIGHEST LAYER4,500 ft TOTAL COVERAGE~48% (mixed) FREEZING LEVEL14,826 ft VFR MARGINunlimited

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

22:47ZSUNRISE

05:23ZSOLAR NOON

11:59ZSUNSET

12:23ZCIVIL END

CURRENT15:10Z DAYLIGHT REMAINING0m VFR NIGHT BEGINS12:23Z (past) DAY LENGTH13h 11m

Waning Crescent

ILLUMINATION11% MOONRISE20:13Z MOONSET09:24Z FULL MOON IN18 days

// Nearest reporting stations · 2 shown · 100 NM (sparse area)

VTCT

VFR

Mae Fah Luang - Chiang Rai International Airport · Chiang Rai

WIND: 180° / 4 kt
VIS: 6+ SM
CEILING: SCT045
DIST: 86 NM NW
AGE: 10m ago

VTUL

MVFR

Loei Airport

WIND: VRB / 1 kt
VIS: 6+ SM
CEILING: OVC030
DIST: 98 NM SE
AGE: 1h 10m ago

// Area map · 100 NM radius · CartoDB Dark Matter + aeronautical overlay

AIRSPACE

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