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// Station · 28m ago

KSMN

Lemhi County Airport
CAT VFR
WIND CALM
VIS 10+ SM
CEILING CLR
T/Td 24.4°C / 8.3°C
ALTIM 30.02 inHg
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 · 16Z
+6H
+12H
+18H
WIND
CALM
 
 
 
VIS
10+ SM
 
 
 
CEILING
CLR
 
 
 
LAYERS
 
 
 
T / Td
24 / 8
 
 
 
ALTIM
30.02"
 
 
 

// Interpretation

VFR with winds calm. 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 KSMN 111656Z AUTO 00000KT 10SM CLR 24/08 A3002 RMK AO2 SLP128 T02440083

KSMN · day 11 at 16:56 UTC · winds calm · visibility 10+ SM · temp 24°C / dewpoint 8°C · altimeter 30.02" Hg · automated station w/ precipitation discriminator · sea-level pressure 1012.8 mb

// 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 +17°C

6,000FT
+1,957 FT ABOVE FIELD ELEV
// DA · LAST 24 HOURS ↘ -100 FT
7,500 5,800 4,100
24h AGO18h12h6hNOW
FIELD ELEV4,043 FT OAT+24°C ISA DELTA+17°C PRESSURE ALT3,940 FT
// Performance equivalent Operating here right now feels like operating at K1U7 (Bear Lake County Airport, Paris, elev 5,928 ft) on a standard ISA day.
// Aircraft performance impact SIGNIFICANT
TAKEOFF ROLL CLIMB RATE
Single-engine propC172, PA-28, Cherokee
+60%
-42%
Turbo / high-perf pistonSR22T, Bonanza, Mooney
+42%
-27%
Light jetCJ4, Phenom 300, M2
+24%
-18%

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 · clear · no layers reported

FT 0 5k 10k 15k 20k 25k FRZ LVL · 16,366 FT KSMN ELEV · 4,043 FT
// Reported layers (highest → lowest)
CLR
No reported cloud layers — clear sky from surface to reporting ceiling.
// Computed
CEILING HIGHEST LAYER TOTAL COVERAGEclear FREEZING LEVEL16,366 ft VFR MARGINunlimited

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

12:00ZSUNRISE
19:42ZSOLAR NOON
03:23ZSUNSET
04:00ZCIVIL END
CURRENT17:24Z DAYLIGHT REMAINING9h 59m VFR NIGHT BEGINS04:00Z (10h 35m) DAY LENGTH15h 23m
Waning Crescent
ILLUMINATION10% MOONRISE09:30Z MOONSET00:54Z FULL MOON IN18 days

// Nearest reporting stations · 4 shown · 100 NM (sparse area)

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

© OpenStreetMap · CartoDB · OpenAIP
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