// Station · 15m ago

RKTU

Cheongju International Airport/Cheongju Air Base (K-59/G-513)

CAT IFR

WIND 080° / 1 kt

VIS 2.0 SM

CEILING CLR

T/Td 23°C / 23°C

ALTIM 29.80 inHg

WX BR

ELEV 191 FT

36.7156°N / 127.5003°E

LOCATION · Cheongju, KR

WIND

080°1 kt

RKTU · 191 FT

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

METRIC

NOW · 20Z

+6H

+12H

+18H

WIND

080°/1

VIS

2.0 SM

CEILING

CLR

LAYERS

—

T / Td

23 / 23

ALTIM

29.80"

// Interpretation

IFR conditions — visibility 2.0 SM. Light winds at 080°/1 kt, visibility 2.0 SM, no reported cloud layers. Reported weather: mist (BR). Mist is water droplets thinning visibility to between 5/8 and 6 SM — the moist, lighter cousin of fog. Would deteriorate to LIFR below 500 ft ceiling or 1 SM, or improve to MVFR above 1,000 ft and 3 SM.

Loading TAF forecast narrative…

SOURCES · NOAA Aviation Weather Center METAR (TAF loading…)

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// Raw observation METAR string + decoded

SPECI RKTU 252010Z 08001KT 3200 BR NSC 23/23 Q1009 RMK CIG250

RKTU · day 25 at 20:10 UTC · wind from 080° at 1 kt · visibility 2.0 SM · temp 23°C / dewpoint 23°C · altimeter 29.80" Hg · weather: mist (BR)

// Runway analysis · computed from current METAR wind

Wind 080° @ 1 kt

ALL USABLE · WINDS CALM

WIND

080°1 kt

HEADWIND CAUTION · HIGH XW AVOID · TAILWIND

ALL RUNWAYS · CALM WINDS 4 ends

06L HDG 060° —CALM —— 9,000'

24R HDG 240° —CALM —— 9,000'

06R HDG 060° —CALM —— 9,000'

24L HDG 240° —CALM —— 9,000'

Pattern altitude: 1,191 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

1,400FT

+1,209 FT ABOVE FIELD ELEV

// DA · LAST 24 HOURS loading…

FIELD ELEV191 FT OAT+23°C ISA DELTA+9°C PRESSURE ALT315 FT

// Performance equivalent Operating here right now feels like operating at RKSC (Surisan Helipad, Gunpo, elev 1,424 ft) on a standard ISA day.

// Aircraft performance impact MODERATE

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. 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 · 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 LEVEL11,807 ft VFR MARGINunlimited

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

20:57ZSUNRISE

03:33ZSOLAR NOON

10:09ZSUNSET

10:36ZCIVIL END

CURRENT20:25Z DAYLIGHT REMAINING13h 44m VFR NIGHT BEGINS10:36Z (14h 11m) DAY LENGTH13h 12m

Waxing Gibbous

ILLUMINATION94% MOONRISE07:08Z MOONSET20:20Z 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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