// Station · 1h 1m ago · STALE

RJSN

Niigata Airport

CAT VFR

WIND 150° / 4 kt

VIS 6+ SM

CEILING BKN at 8,000 ft

T/Td 26°C / 23°C

ALTIM 29.91 inHg

WX -RA

ELEV 29 FT

37.9542°N / 139.1122°E

LOCATION · Niigata, JP

WIND

150°4 kt

RJSN · 29 FT

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

METRIC

NOW · 13Z

+6H

+12H

+18H

WIND

150°/4

VIS

6+ SM

CEILING

BKN080

LAYERS

BKN080 OVC140

T / Td

26 / 23

ALTIM

29.91"

// Interpretation

VFR — ceiling 8,000 ft. Light winds at 150°/4 kt, visibility 6+ SM, broken at 8,000 ft, and overcast at 14,000 ft. Reported weather: -RA. 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 111300Z AUTO 15004KT 9999 -RA BKN080 OVC140 26/23 Q1013

RJSN · day 11 at 13:00 UTC · wind from 150° at 4 kt · visibility 6+ SM · broken layer at 8,000 ft · overcast at 14,000 ft · temp 26°C / dewpoint 23°C · altimeter 29.91" Hg · weather: -RA

// Runway analysis · computed from current METAR wind

Wind 150° @ 4 kt

ALL USABLE · WINDS CALM

WIND

150°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 +11°C

1,400FT

+1,371 FT ABOVE FIELD ELEV

// DA · LAST 24 HOURS ↗ +100 FT

24h AGO18h12h6hNOW

FIELD ELEV29 FT OAT+26°C ISA DELTA+11°C PRESSURE ALT35 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

+14%

-10%

Turbo / high-perf pistonSR22T, Bonanza, Mooney

+10%

-6%

Light jetCJ4, Phenom 300, M2

+6%

-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)

OVC140

Overcast · base 14,000 ft AGL · 8 oktas

BKN080

Broken · base 8,000 ft AGL · ~5–7 oktas

// Computed

CEILING8,000 ft AGL HIGHEST LAYER14,000 ft TOTAL COVERAGE~100% (overcast) FREEZING LEVEL13,160 ft VFR MARGIN+5,000 ft

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

19:31ZSUNRISE

02:50ZSOLAR NOON

10:09ZSUNSET

10:39ZCIVIL END

CURRENT14:01Z DAYLIGHT REMAINING0m VFR NIGHT BEGINS10:39Z (past) DAY LENGTH14h 37m

Waning Crescent

ILLUMINATION11% MOONRISE16:54Z MOONSET07:32Z FULL MOON IN18 days

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

RJSF

MVFR

Fukushima Airport · Sukagawa

WIND: 310° / 3 kt
VIS: 3.7 SM
CEILING: OVC050
DIST: 76 NM SE
AGE: 1h 1m ago

RJSS

VFR → MVFR 20Z

Sendai Airport · Natori

WIND: 200° / 3 kt
VIS: 6+ SM
CEILING: BKN090
DIST: 86 NM E
AGE: 1h 1m ago

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

AIRSPACE

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