// Station · 3h 21m ago · STALE

RJSY

Shonai Airport

CAT VFR

WIND 100° / 13 kt

VIS 6+ SM

CEILING Few/scattered only

T/Td 23°C / 18°C

ALTIM 29.71 inHg

ELEV 86 FT

38.8122°N / 139.7870°E

LOCATION · Shonai, JP

WIND

100°13 kt

RJSY · 86 FT

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

METRIC

NOW · 12Z

+6H

+12H

+18H

WIND

100°/13

VIS

6+ SM

CEILING

—

LAYERS

FEW040 SCT050

T / Td

23 / 18

ALTIM

29.71"

// Interpretation

VFR with brisk winds at 100°/13 kt. Visibility 6+ SM and a few at 4,000 ft, and scattered at 5,000 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 RJSY 271200Z 10013KT 9999 FEW040 SCT050 BKN/// 23/18 Q1006

RJSY · day 27 at 12:00 UTC · wind from 100° at 13 kt · visibility 6+ SM · a few clouds at 4,000 ft · scattered layer at 5,000 ft · temp 23°C / dewpoint 18°C · altimeter 29.71" Hg

// Runway analysis · computed from current METAR wind

Wind 100° @ 13 kt

1 USABLE · 1 AVOID

WIND

100°13 kt

HEADWIND CAUTION · HIGH XW AVOID · TAILWIND

HEADWIND ENDS 1 usable

09★ HDG 090° H13 kt X2 kt RIGHT PRIMARY · 6,560'

TAILWIND ENDS · AVOID 1 ends

27 HDG 270° T13 kt X2 kt LEFT —

Pattern altitude: 1,086 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 +9°C

1,300FT

+1,214 FT ABOVE FIELD ELEV

// DA · LAST 24 HOURS ↗ +300 FT

24h AGO18h12h6hNOW

FIELD ELEV86 FT OAT+23°C ISA DELTA+9°C PRESSURE ALT299 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 MINOR

TAKEOFF ROLL CLIMB RATE

Single-engine propC172, PA-28, Cherokee

+13%

-9%

Turbo / high-perf pistonSR22T, Bonanza, Mooney

+9%

-6%

Light jetCJ4, Phenom 300, M2

+5%

-4%

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)

SCT050

Scattered · base 5,000 ft AGL · ~3–4 oktas

FEW040

Few · base 4,000 ft AGL · ~1–2 oktas

// Computed

CEILING— HIGHEST LAYER5,000 ft TOTAL COVERAGE~48% (mixed) FREEZING LEVEL11,702 ft VFR MARGINunlimited

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

19:21ZSUNRISE

02:39ZSOLAR NOON

09:57ZSUNSET

10:28ZCIVIL END

CURRENT15:21Z DAYLIGHT REMAINING18h 36m VFR NIGHT BEGINS10:28Z (19h 07m) DAY LENGTH14h 36m

Waxing Gibbous

ILLUMINATION84% MOONRISE04:13Z MOONSET18:49Z FULL MOON IN4 days

// Nearest reporting stations · 3 shown · 100 NM (sparse area)

RJSN

VFR

Niigata Airport · Niigata

WIND: CALM
VIS: 6+ SM
CEILING: CLR
DIST: 61 NM SW
AGE: 21m ago

RJSS

LIFR

Sendai Airport · Natori

WIND: VRB / 2 kt
VIS: 0.19 SM
CEILING: OVC001
DIST: 67 NM SE
AGE: 21m ago

RJSF

VFR → MVFR 12Z

Fukushima Airport · Sukagawa

WIND: 150° / 2 kt
VIS: 6+ SM
CEILING: BKN190
DIST: 100 NM S
AGE: 21m ago

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

AIRSPACE

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