// Station · 20m ago

LSMA

Alpnach Air Base

CAT —

WIND CALM

VIS —

CEILING BKN at 10,000 ft

T/Td 22°C / 20°C

ALTIM 29.94 inHg

ELEV 1,460 FT

46.9439°N / 8.2842°E

LOCATION · Alpnach, CH

WIND

000°0 kt

LSMA · 1,460 FT

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

METRIC

NOW · 17Z

+6H

+12H

+18H

WIND

CALM

VIS

—

CEILING

BKN100

LAYERS

BKN100 BKN120

T / Td

22 / 20

ALTIM

29.94"

// Interpretation

VFR — ceiling 10,000 ft. Winds calm, visibility unreported, broken at 10,000 ft, and broken at 12,000 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 LSMA 251750Z AUTO 00000KT 9999NDV BKN100 BKN120 22/20 Q1014 RMK

LSMA · day 25 at 17:50 UTC · winds calm · broken layer at 10,000 ft · broken layer at 12,000 ft · temp 22°C / dewpoint 20°C · altimeter 29.94" 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

01 HDG 010° —CALM —— 4,914'

19 HDG 190° —CALM —— 4,914'

Pattern altitude: 2,460 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

2,600FT

+1,140 FT ABOVE FIELD ELEV

// DA · LAST 24 HOURS loading…

FIELD ELEV1,460 FT OAT+22°C ISA DELTA+10°C PRESSURE ALT1,437 FT

// Performance equivalent Your aircraft will perform as if it's at a field 2,600 ft high on a standard ISA day — that's +1,140 ft above LSMA's actual elevation.

// Aircraft performance impact MODERATE

TAKEOFF ROLL CLIMB RATE

Single-engine propC172, PA-28, Cherokee

+26%

-18%

Turbo / high-perf pistonSR22T, Bonanza, Mooney

+18%

-12%

Light jetCJ4, Phenom 300, M2

+10%

-8%

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 · 2 reported · highest to lowest

// Reported layers (highest → lowest)

BKN120

Broken · base 12,000 ft AGL · ~5–7 oktas

BKN100

Broken · base 10,000 ft AGL · ~5–7 oktas

// Computed

CEILING10,000 ft AGL HIGHEST LAYER12,000 ft TOTAL COVERAGE~83% (mostly covered) FREEZING LEVEL12,571 ft VFR MARGIN+7,000 ft

// Sun & Moon · times in Z · bar = local day (UTC+1)

04:38ZSUNRISE

11:30ZSOLAR NOON

18:22ZSUNSET

18:55ZCIVIL END

CURRENT18:10Z DAYLIGHT REMAINING11m VFR NIGHT BEGINS18:55Z (44m) DAY LENGTH13h 44m

Waxing Gibbous

ILLUMINATION94% MOONRISE14:44Z MOONSET04:29Z 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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