// Station · 6m ago

RJTF

Chofu Airport

CAT VFR

WIND 020° / 7 kt

VIS 6+ SM

CEILING BKN at 4,000 ft

T/Td 22°C / 15°C

ALTIM 30.03 inHg

ELEV 141 FT

35.6717°N / 139.5280°E

LOCATION · Chofu, JP

WIND

020°7 kt

RJTF · 141 FT

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

METRIC

NOW · 01Z

+6H

+12H

+18H

WIND

020°/7

VIS

6+ SM

CEILING

BKN040

LAYERS

FEW030 BKN040

T / Td

22 / 15

ALTIM

30.03"

// Interpretation

VFR — ceiling 4,000 ft. Light winds at 020°/7 kt, visibility 6+ SM, a few at 3,000 ft, and broken at 4,000 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 RJTF 130100Z 02007KT 9999 FEW030 BKN040 22/15 Q1017

RJTF · day 13 at 01:00 UTC · wind from 020° at 7 kt · visibility 6+ SM · a few clouds at 3,000 ft · broken layer at 4,000 ft · temp 22°C / dewpoint 15°C · altimeter 30.03" Hg

// Runway analysis · computed from current METAR wind

Wind 020° @ 7 kt

1 USABLE · 1 AVOID

WIND

020°7 kt

HEADWIND CAUTION · HIGH XW AVOID · TAILWIND

HEADWIND ENDS 1 usable

35★ HDG 350° H6 kt X4 kt RIGHT PRIMARY · 2,625'

TAILWIND ENDS · AVOID 1 ends

17 HDG 170° T6 kt X3 kt LEFT —

Pattern altitude: 1,141 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 +7°C

900FT

+759 FT ABOVE FIELD ELEV

// DA · LAST 24 HOURS loading…

FIELD ELEV141 FT OAT+22°C ISA DELTA+7°C PRESSURE ALT29 FT

// Performance equivalent Operating here right now feels like operating at RJTY (Yokota Air Base, Fussa, elev 463 ft) on a standard ISA day.

// Aircraft performance impact MINOR

TAKEOFF ROLL CLIMB RATE

Single-engine propC172, PA-28, Cherokee

+9%

-6%

Turbo / high-perf pistonSR22T, Bonanza, Mooney

+6%

-4%

Light jetCJ4, Phenom 300, M2

+4%

-3%

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)

BKN040

Broken · base 4,000 ft AGL · ~5–7 oktas

FEW030

Few · base 3,000 ft AGL · ~1–2 oktas

// Computed

CEILING4,000 ft AGL HIGHEST LAYER4,000 ft TOTAL COVERAGE~83% (mostly covered) FREEZING LEVEL11,252 ft VFR MARGIN+1,000 ft

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

20:47ZSUNRISE

02:29ZSOLAR NOON

08:11ZSUNSET

08:37ZCIVIL END

CURRENT01:06Z DAYLIGHT REMAINING7h 04m VFR NIGHT BEGINS08:37Z (7h 30m) DAY LENGTH11h 24m

Waxing Crescent

ILLUMINATION3% MOONRISE22:08Z 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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