// Station · 14m ago

RJSN

Niigata Airport

CAT VFR

WIND 210° / 6 kt

VIS 6+ SM

CEILING Few/scattered only

T/Td 27°C / 26°C

ALTIM 29.80 inHg

ELEV 29 FT

37.9542°N / 139.1122°E

LOCATION · Niigata, JP

WIND

210°6 kt

RJSN · 29 FT

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

METRIC

NOW · 18Z

+6H

+12H

+18H

WIND

210°/6

VIS

6+ SM

CEILING

—

LAYERS

FEW060

T / Td

27 / 26

ALTIM

29.80"

// Interpretation

VFR with light winds at 210°/6 kt. Visibility 6+ SM and a few at 6,000 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 251800Z AUTO 21006KT 9999 FEW060 //////TCU 27/26 Q1009

RJSN · day 25 at 18:00 UTC · wind from 210° at 6 kt · visibility 6+ SM · a few clouds at 6,000 ft · temp 27°C / dewpoint 26°C · altimeter 29.80" Hg

// Runway analysis · computed from current METAR wind

Wind 210° @ 6 kt

2 USABLE · 2 AVOID · 1 CAUTION

WIND

210°6 kt

HEADWIND CAUTION · HIGH XW AVOID · TAILWIND

HEADWIND ENDS 2 usable

22★ HDG 220° H6 kt X1 kt LEFT PRIMARY · 4,300'

28 HDG 280° H2 kt X6 kt LEFT ⚠ HIGH XW · 100%

TAILWIND ENDS · AVOID 2 ends

10 HDG 100° T2 kt X6 kt RIGHT —

04 HDG 040° T6 kt X1 kt RIGHT —

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 +12°C

1,600FT

+1,571 FT ABOVE FIELD ELEV

// DA · LAST 24 HOURS loading…

FIELD ELEV29 FT OAT+27°C ISA DELTA+12°C PRESSURE ALT153 FT

// Performance equivalent Operating here right now feels like operating at RJSF (Fukushima Airport, Sukagawa, elev 1,221 ft) on a standard ISA day.

// Aircraft performance impact MODERATE

TAKEOFF ROLL CLIMB RATE

Single-engine propC172, PA-28, Cherokee

+16%

-11%

Turbo / high-perf pistonSR22T, Bonanza, Mooney

+11%

-7%

Light jetCJ4, Phenom 300, M2

+6%

-5%

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)

FEW060

Few · base 6,000 ft AGL · ~1–2 oktas

// Computed

CEILING— HIGHEST LAYER6,000 ft TOTAL COVERAGE~15% (sparse) FREEZING LEVEL13,665 ft VFR MARGINunlimited

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

20:09ZSUNRISE

02:47ZSOLAR NOON

09:24ZSUNSET

09:52ZCIVIL END

CURRENT18:14Z DAYLIGHT REMAINING15h 10m VFR NIGHT BEGINS09:52Z (15h 38m) DAY LENGTH13h 15m

Waxing Gibbous

ILLUMINATION94% MOONRISE06:15Z MOONSET19:31Z 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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