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// Station · 7m ago

KSMN

Lemhi County Airport
CAT IFR
WIND CALM
VIS 2.5 SM
CEILING Few/scattered only
T/Td 7°C / 6°C
ALTIM 29.85 inHg
WX BR
ELEV 4,043 FT
45.1222°N / 113.8820°W
LOCATION · Salmon, US
N
WIND
000°0 kt
KSMN · 4,043 FT
© OSM · CartoDB

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

METRIC
NOW · 11Z
+6H
+12H
+18H
WIND
CALM
 
 
 
VIS
2.5 SM
 
 
 
CEILING
 
 
 
LAYERS
FEW001
 
 
 
T / Td
7 / 6
 
 
 
ALTIM
29.85"
 
 
 

// Interpretation

IFR conditions — visibility 2.5 SM. Winds calm, visibility 2.5 SM, a few at 100 ft. Reported weather: BR. 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 KSMN 271147Z AUTO 00000KT 2 1/2SM BR FEW001 07/06 A2985 RMK AO2 VIS 1/2V5

KSMN · day 27 at 11:47 UTC · winds calm · visibility 2.5 SM · a few clouds at 100 ft · temp 7°C / dewpoint 6°C · altimeter 29.85" Hg · weather: BR · automated station w/ precipitation discriminator

// Runway analysis · computed from current METAR wind

Wind CALM
ALL USABLE · WINDS CALM
N
WIND
000°calm
HEADWIND CAUTION · HIGH XW AVOID · TAILWIND
ALL RUNWAYS · CALM WINDS 2 ends
17 HDG 170° CALM 5,510'
35 HDG 350° CALM 5,510'
Pattern altitude: 5,043 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 +0°C

4,100FT
+57 FT ABOVE FIELD ELEV
// DA · LAST 24 HOURS ↘ -600 FT
6,100 4,900 3,700
24h AGO18h12h6hNOW
FIELD ELEV4,043 FT OAT+7°C ISA DELTA+0°C PRESSURE ALT4,111 FT
// Performance equivalent Operating here right now feels like operating at KBYI (Burley Municipal Airport, Burley, elev 4,150 ft) on a standard ISA day.
// Aircraft performance impact SIGNIFICANT
TAKEOFF ROLL CLIMB RATE
Single-engine propC172, PA-28, Cherokee
+41%
-29%
Turbo / high-perf pistonSR22T, Bonanza, Mooney
+29%
-18%
Light jetCJ4, Phenom 300, M2
+16%
-12%

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 · 1 reported · highest to lowest

FT 0 5k 10k 15k 20k 25k FRZ LVL · 7,578 FT FEW001 KSMN ELEV · 4,043 FT
// Reported layers (highest → lowest)
FEW001
Few · base 100 ft AGL · ~1–2 oktas
// Computed
CEILING HIGHEST LAYER100 ft TOTAL COVERAGE~15% (sparse) FREEZING LEVEL7,578 ft VFR MARGINunlimited

// Sun & Moon · times in Z · bar = local day (UTC-8)

11:56ZSUNRISE
19:34ZSOLAR NOON
03:12ZSUNSET
03:47ZCIVIL END
CURRENT11:54Z DAYLIGHT REMAINING15h 17m VFR NIGHT BEGINS03:47Z (15h 53m) DAY LENGTH15h 15m
Waxing Gibbous
ILLUMINATION83% MOONRISE20:41Z MOONSET11:56Z FULL MOON IN4 days

// Nearest reporting stations · 5 shown · 150 NM (sparse area)

// Area map · 120 NM radius · CartoDB Dark Matter + aeronautical overlay

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