// Station · 1h 6m ago · STALE

RJSN

Niigata Airport

CAT VFR

WIND 040° / 3 kt

VIS 6+ SM

CEILING Few/scattered only

T/Td 20°C / 15°C

ALTIM 30.00 inHg

ELEV 29 FT

37.9542°N / 139.1122°E

LOCATION · Niigata, JP

WIND

040°3 kt

RJSN · 29 FT

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

METRIC

NOW · 00Z

+6H

+12H

+18H

WIND

040°/3

VIS

6+ SM

CEILING

—

LAYERS

FEW030

T / Td

20 / 15

ALTIM

30.00"

// Interpretation

VFR with light winds at 040°/3 kt. Visibility 6+ SM and a few at 3,000 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 RJSN 130000Z 04003KT 360V090 9999 FEW030 20/15 Q1016

RJSN · day 13 at 00:00 UTC · wind from 040° at 3 kt · visibility 6+ SM · a few clouds at 3,000 ft · temp 20°C / dewpoint 15°C · altimeter 30.00" Hg

// Runway analysis · computed from current METAR wind

Wind 040° @ 3 kt

ALL USABLE · WINDS CALM

WIND

040°3 kt

HEADWIND CAUTION · HIGH XW AVOID · TAILWIND

ALL RUNWAYS · CALM WINDS 4 ends

10 HDG 100° —CALM —— 8,200'

28 HDG 280° —CALM —— 8,200'

04 HDG 040° —CALM —— 4,300'

22 HDG 220° —CALM —— 4,300'

Pattern altitude: 1,029 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 +5°C

500FT

+471 FT ABOVE FIELD ELEV

// DA · LAST 24 HOURS loading…

FIELD ELEV29 FT OAT+20°C ISA DELTA+5°C PRESSURE ALT-53 FT

// Performance equivalent Operating here right now feels like operating at RJSD (Sado Airport, Sado, elev 88 ft) on a standard ISA day.

// Aircraft performance impact MINOR

TAKEOFF ROLL CLIMB RATE

Single-engine propC172, PA-28, Cherokee

+5%

-4%

Turbo / high-perf pistonSR22T, Bonanza, Mooney

+4%

-2%

Light jetCJ4, Phenom 300, M2

+2%

-2%

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)

FEW030

Few · base 3,000 ft AGL · ~1–2 oktas

// Computed

CEILING— HIGHEST LAYER3,000 ft TOTAL COVERAGE~15% (sparse) FREEZING LEVEL10,130 ft VFR MARGINunlimited

// Sun & Moon · times in Z · bar = local day (UTC+9)

20:50ZSUNRISE

02:31ZSOLAR NOON

08:11ZSUNSET

08:37ZCIVIL END

CURRENT01:06Z DAYLIGHT REMAINING7h 04m VFR NIGHT BEGINS08:37Z (7h 31m) DAY LENGTH11h 20m

Waxing Crescent

ILLUMINATION3% MOONRISE22:11Z MOONSET09:32Z 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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