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// Station · 4m ago

KALN

St Louis Regional Airport
CAT VFR
WIND VRB / 3 kt
VIS 10+ SM
CEILING BKN at 5,000 ft
T/Td 21°C / 19°C
ALTIM 29.98 inHg
ELEV 544 FT
38.8903°N / 90.0460°W
LOCATION · Alton/St Louis, US
N
WIND
VRB3 kt
KALN · 544 FT
© OSM · CartoDB

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

METRIC
NOW · 11Z
+6H
+12H
+18H
WIND
VRB/3
 
 
 
VIS
10+ SM
 
 
 
CEILING
BKN050
 
 
 
LAYERS
SCT035 BKN050 OVC085
 
 
 
T / Td
21 / 19
 
 
 
ALTIM
29.98"
 
 
 

// Interpretation

VFR — ceiling 5,000 ft. Light winds at variable/3 kt, visibility better than 10 statute miles, scattered at 3,500 ft, broken at 5,000 ft, and overcast at 8,500 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 KALN 271150Z VRB03KT 10SM SCT035 BKN050 OVC085 21/19 A2998

KALN · day 27 at 11:50 UTC · wind variable at 3 kt · visibility 10+ SM · scattered layer at 3,500 ft · broken layer at 5,000 ft · overcast at 8,500 ft · temp 21°C / dewpoint 19°C · altimeter 29.98" Hg

// Runway analysis · computed from current METAR wind

Wind VRB @ 3 kt
ALL USABLE · WINDS CALM
N
WIND
VRB3 kt
HEADWIND CAUTION · HIGH XW AVOID · TAILWIND
ALL RUNWAYS · CALM WINDS 4 ends
11 HDG 110° CALM 8,099'
29 HDG 290° CALM 8,099'
17 HDG 170° CALM 6,500'
35 HDG 350° CALM 6,500'
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 +7°C

1,300FT
+756 FT ABOVE FIELD ELEV
// DA · LAST 24 HOURS ↗ +300 FT
2,400 1,600 800
24h AGO18h12h6hNOW
FIELD ELEV544 FT OAT+21°C ISA DELTA+7°C PRESSURE ALT482 FT
// Performance equivalent Operating here right now feels like operating at KBMI (Central Illinois Regional Airport at Bloomington-Normal, Bloomington/Normal, elev 871 ft) on a standard ISA day.
// Aircraft performance impact MINOR
TAKEOFF ROLL CLIMB RATE
Single-engine propC172, PA-28, Cherokee
+13%
-9%
Turbo / high-perf pistonSR22T, Bonanza, Mooney
+9%
-6%
Light jetCJ4, Phenom 300, M2
+5%
-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 · 3 reported · highest to lowest

FT 0 5k 10k 15k 20k 25k FRZ LVL · 11,150 FT SCT035 BKN050 · CEILING OVC085 KALN ELEV · 544 FT
// Reported layers (highest → lowest)
OVC085
Overcast · base 8,500 ft AGL · 8 oktas
BKN050
Broken · base 5,000 ft AGL · ~5–7 oktas
SCT035
Scattered · base 3,500 ft AGL · ~3–4 oktas
// Computed
CEILING5,000 ft AGL HIGHEST LAYER8,500 ft TOTAL COVERAGE~100% (overcast) FREEZING LEVEL11,150 ft VFR MARGIN+2,000 ft

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

10:40ZSUNRISE
17:58ZSOLAR NOON
01:17ZSUNSET
01:48ZCIVIL END
CURRENT11:54Z DAYLIGHT REMAINING13h 22m VFR NIGHT BEGINS01:48Z (13h 53m) DAY LENGTH14h 36m
Waxing Gibbous
ILLUMINATION83% MOONRISE19:25Z MOONSET10:01Z FULL MOON IN4 days

// Nearest reporting stations · 5 shown · 100 NM (sparse area)

// Area map · 80 NM radius · CartoDB Dark Matter + aeronautical overlay

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