// Station · 22m ago

RJSN

Niigata Airport

CAT VFR

WIND 160° / 4 kt

VIS 6+ SM

CEILING CLR

T/Td 25°C / 22°C

ALTIM 29.85 inHg

ELEV 29 FT

37.9542°N / 139.1122°E

LOCATION · Niigata, JP

WIND

160°4 kt

RJSN · 29 FT

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

METRIC

NOW · 17Z

+6H

+12H

+18H

WIND

160°/4

VIS

6+ SM

CEILING

CLR

LAYERS

—

T / Td

25 / 22

ALTIM

29.85"

// Interpretation

VFR with light winds at 160°/4 kt. Visibility 6+ SM and no reported cloud layers. 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 111700Z AUTO 16004KT 9999 NSC 25/22 Q1011

RJSN · day 11 at 17:00 UTC · wind from 160° at 4 kt · visibility 6+ SM · temp 25°C / dewpoint 22°C · altimeter 29.85" Hg

// Runway analysis · computed from current METAR wind

Wind 160° @ 4 kt

ALL USABLE · WINDS CALM

WIND

160°4 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 +10°C

1,300FT

+1,271 FT ABOVE FIELD ELEV

// DA · LAST 24 HOURS ↘ -100 FT

24h AGO18h12h6hNOW

FIELD ELEV29 FT OAT+25°C ISA DELTA+10°C PRESSURE ALT94 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 · clear · no layers reported

// Reported layers (highest → lowest)

CLR

No reported cloud layers — clear sky from surface to reporting ceiling.

// Computed

CEILING— HIGHEST LAYER— TOTAL COVERAGEclear FREEZING LEVEL12,655 ft VFR MARGINunlimited

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

19:31ZSUNRISE

02:50ZSOLAR NOON

10:08ZSUNSET

10:39ZCIVIL END

CURRENT17:22Z DAYLIGHT REMAINING16h 45m VFR NIGHT BEGINS10:39Z (17h 16m) DAY LENGTH14h 36m

Waning Crescent

ILLUMINATION10% MOONRISE17:02Z MOONSET07:38Z FULL MOON IN18 days

// Nearest reporting stations · 2 shown · 100 NM (sparse area)

RJSF

VFR

Fukushima Airport · Sukagawa

WIND: 200° / 3 kt
VIS: 5.6 SM
CEILING: BKN140
DIST: 76 NM SE
AGE: 22m ago

RJSS

VFR → MVFR 20Z

Sendai Airport · Natori

WIND: 170° / 5 kt
VIS: 6+ SM
CEILING: BKN130
DIST: 86 NM E
AGE: 22m ago

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

AIRSPACE

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