// Station · 4h 2m ago · STALE

VTCN

Nan Airport

CAT VFR

WIND VRB / 2 kt

VIS 6+ SM

CEILING BKN at 4,500 ft

T/Td 25°C / 25°C

ALTIM 29.71 inHg

ELEV 685 FT

18.8079°N / 100.7830°E

WIND

VRB2 kt

VTCN · 685 FT

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

METRIC

NOW · 13Z

+6H

+12H

+18H

WIND

VRB/2

VIS

6+ SM

CEILING

BKN045

LAYERS

FEW007 BKN045

T / Td

25 / 25

ALTIM

29.71"

// Interpretation

VFR — ceiling 4,500 ft. Light winds at variable/2 kt, visibility 6+ SM, a few at 700 ft, and broken 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 251300Z VRB02KT 9999 FEW007 BKN045 25/25 Q1006 NOSIG

VTCN · day 25 at 13:00 UTC · wind variable at 2 kt · visibility 6+ SM · a few clouds at 700 ft · broken layer at 4,500 ft · temp 25°C / dewpoint 25°C · altimeter 29.71" Hg

// Runway analysis · computed from current METAR wind

Wind VRB @ 2 kt

ALL USABLE · WINDS CALM

WIND

VRB2 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 +12°C

2,300FT

+1,615 FT ABOVE FIELD ELEV

// DA · LAST 24 HOURS loading…

FIELD ELEV685 FT OAT+25°C ISA DELTA+12°C PRESSURE ALT898 FT

// Performance equivalent Your aircraft will perform as if it's at a field 2,300 ft high on a standard ISA day — that's +1,615 ft above VTCN's actual elevation.

// Aircraft performance impact MODERATE

TAKEOFF ROLL CLIMB RATE

Single-engine propC172, PA-28, Cherokee

+23%

-16%

Turbo / high-perf pistonSR22T, Bonanza, Mooney

+16%

-10%

Light jetCJ4, Phenom 300, M2

+9%

-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 · 2 reported · highest to lowest

// Reported layers (highest → lowest)

BKN045

Broken · base 4,500 ft AGL · ~5–7 oktas

FEW007

Few · base 700 ft AGL · ~1–2 oktas

// Computed

CEILING4,500 ft AGL HIGHEST LAYER4,500 ft TOTAL COVERAGE~83% (mostly covered) FREEZING LEVEL13,311 ft VFR MARGIN+1,500 ft

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

23:02ZSUNRISE

05:20ZSOLAR NOON

11:38ZSUNSET

12:00ZCIVIL END

CURRENT17:02Z DAYLIGHT REMAINING18h 35m VFR NIGHT BEGINS12:00Z (18h 58m) DAY LENGTH12h 36m

Waxing Gibbous

ILLUMINATION94% MOONRISE09:06Z MOONSET21:42Z 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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