// Station · 19m ago

UMBB

Brest International Airport

CAT MVFR

WIND CALM

VIS 5.0 SM

CEILING BKN at 4,600 ft

T/Td 21°C / 9°C

ALTIM 30.09 inHg

ELEV 468 FT

52.1081°N / 23.8968°E

LOCATION · Brest, BY

WIND

000°0 kt

UMBB · 468 FT

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

METRIC

NOW · 16Z

+6H

+12H

+18H

WIND

CALM

VIS

5.0 SM

CEILING

BKN046

LAYERS

BKN046

T / Td

21 / 9

ALTIM

30.09"

// Interpretation

MVFR — visibility 5.0 SM. Winds calm, visibility 5.0 SM, broken at 4,600 ft. Would drop to IFR below 1,000 ft ceiling or 3 SM visibility, or rise back to VFR above 3,000 ft and 5 SM.

Loading TAF forecast narrative…

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

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// Raw observation METAR string + decoded

METAR UMBB 251600Z 00000MPS 8000 BKN046 21/09 Q1019 NOSIG

UMBB · day 25 at 16:00 UTC · winds calm · visibility 5.0 SM · broken layer at 4,600 ft · temp 21°C / dewpoint 9°C · altimeter 30.09" Hg

// Runway analysis · computed from current METAR wind

Wind CALM

ALL USABLE · WINDS CALM

WIND

000°calm

HEADWIND CAUTION · HIGH XW AVOID · TAILWIND

ALL RUNWAYS · CALM WINDS 2 ends

11 HDG 110° —CALM —— 8,596'

29 HDG 290° —CALM —— 8,596'

Pattern altitude: 1,468 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

1,100FT

+632 FT ABOVE FIELD ELEV

// DA · LAST 24 HOURS loading…

FIELD ELEV468 FT OAT+21°C ISA DELTA+7°C PRESSURE ALT297 FT

// Performance equivalent Operating here right now feels like operating at UMMS (Minsk National Airport, Minsk, elev 670 ft) on a standard ISA day.

// Aircraft performance impact MINOR

TAKEOFF ROLL CLIMB RATE

Single-engine propC172, PA-28, Cherokee

+11%

-8%

Turbo / high-perf pistonSR22T, Bonanza, Mooney

+8%

-5%

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 · 1 reported · highest to lowest

// Reported layers (highest → lowest)

BKN046

Broken · base 4,600 ft AGL · ~5–7 oktas

// Computed

CEILING4,600 ft AGL HIGHEST LAYER4,600 ft TOTAL COVERAGE~75% (mostly covered) FREEZING LEVEL11,074 ft VFR MARGIN+1,600 ft

// Sun & Moon · times in Z · bar = local day (UTC+2)

03:25ZSUNRISE

10:28ZSOLAR NOON

17:30ZSUNSET

18:07ZCIVIL END

CURRENT16:19Z DAYLIGHT REMAINING1h 11m VFR NIGHT BEGINS18:07Z (1h 47m) DAY LENGTH14h 05m

Waxing Gibbous

ILLUMINATION94% MOONRISE13:27Z MOONSET03:33Z 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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