// Station · 27m ago

KALN

St Louis Regional Airport

CAT VFR

WIND 140° / 5 kt

VIS 10+ SM

CEILING CLR

T/Td 26°C / 17°C

ALTIM 30.10 inHg

ELEV 544 FT

38.8903°N / 90.0460°W

LOCATION · Alton/St Louis, US

WIND

140°5 kt

KALN · 544 FT

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

METRIC

NOW · 15Z

+6H

+12H

+18H

WIND

140°/5

VIS

10+ SM

CEILING

CLR

LAYERS

—

T / Td

26 / 17

ALTIM

30.10"

// Interpretation

VFR with light winds at 140°/5 kt. Visibility better than 10 statute miles 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 KALN 251550Z 14005KT 10SM CLR 26/17 A3010

KALN · day 25 at 15:50 UTC · wind from 140° at 5 kt · visibility 10+ SM · temp 26°C / dewpoint 17°C · altimeter 30.10" Hg

// Runway analysis · computed from current METAR wind

Wind 140° @ 5 kt

2 USABLE · 2 AVOID

WIND

140°5 kt

HEADWIND CAUTION · HIGH XW AVOID · TAILWIND

HEADWIND ENDS 2 usable

11★ HDG 110° H4 kt X2 kt RIGHT PRIMARY · 8,099'

17 HDG 170° H4 kt X2 kt LEFT 6,500'

TAILWIND ENDS · AVOID 2 ends

29 HDG 290° T4 kt X2 kt LEFT —

35 HDG 350° T4 kt X3 kt RIGHT —

Pattern altitude: 1,544 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 +12°C

1,800FT

+1,256 FT ABOVE FIELD ELEV

// DA · LAST 24 HOURS loading…

FIELD ELEV544 FT OAT+26°C ISA DELTA+12°C PRESSURE ALT361 FT

// Performance equivalent Operating here right now feels like operating at KCSV (Crossville Memorial Airport Whitson Field, Crossville, elev 1,881 ft) on a standard ISA day.

// Aircraft performance impact MODERATE

TAKEOFF ROLL CLIMB RATE

Single-engine propC172, PA-28, Cherokee

+18%

-13%

Turbo / high-perf pistonSR22T, Bonanza, Mooney

+13%

-8%

Light jetCJ4, Phenom 300, M2

+7%

-5%

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 LEVEL13,675 ft VFR MARGINunlimited

// Sun & Moon · times in Z · bar = local day (UTC-6)

11:24ZSUNRISE

18:03ZSOLAR NOON

00:43ZSUNSET

01:11ZCIVIL END

CURRENT16:17Z DAYLIGHT REMAINING8h 26m VFR NIGHT BEGINS01:11Z (8h 53m) DAY LENGTH13h 19m

Waxing Gibbous

ILLUMINATION94% MOONRISE21:26Z MOONSET10:45Z 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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