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// Station · 32m ago

KGTF

Great Falls International Airport
CAT VFR
WIND CALM
VIS 10+ SM
CEILING CLR
T/Td 20.6°C / 8.9°C
ALTIM 29.89 inHg
ELEV 3,680 FT
47.4820°N / 111.3710°W
LOCATION · Great Falls, US
N
WIND
000°0 kt
KGTF · 3,680 FT
© OSM · CartoDB

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

METRIC
NOW · 13Z
+6H
+12H
+18H
WIND
CALM
 
 
 
VIS
10+ SM
 
 
 
CEILING
CLR
 
 
 
LAYERS
 
 
 
T / Td
21 / 9
 
 
 
ALTIM
29.89"
 
 
 

// 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 KGTF 111353Z 00000KT 10SM CLR 21/09 A2989 RMK AO2 SLP085 T02060089 $

KGTF · day 11 at 13:53 UTC · winds calm · visibility 10+ SM · temp 21°C / dewpoint 9°C · altimeter 29.89" Hg · automated station w/ precipitation discriminator · sea-level pressure 1008.5 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 6 ends
03 HDG 030° CALM 10,502'
21 HDG 210° CALM 10,502'
17 HDG 170° CALM 6,030'
35 HDG 350° CALM 6,030'
07 HDG 070° CALM 4,294'
25 HDG 250° CALM 4,294'
Pattern altitude: 4,680 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 +13°C

5,300FT
+1,620 FT ABOVE FIELD ELEV
// DA · LAST 24 HOURS ↘ -200 FT
7,000 5,500 4,000
24h AGO18h12h6hNOW
FIELD ELEV3,680 FT OAT+21°C ISA DELTA+13°C PRESSURE ALT3,707 FT
// Performance equivalent Operating here right now feels like operating at KDLN (Dillon Airport, Dillon, elev 5,241 ft) on a standard ISA day.
// Aircraft performance impact SIGNIFICANT
TAKEOFF ROLL CLIMB RATE
Single-engine propC172, PA-28, Cherokee
+53%
-37%
Turbo / high-perf pistonSR22T, Bonanza, Mooney
+37%
-24%
Light jetCJ4, Phenom 300, M2
+21%
-16%

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 · 14,084 FT KGTF ELEV · 3,680 FT
// Reported layers (highest → lowest)
CLR
No reported cloud layers — clear sky from surface to reporting ceiling.
// Computed
CEILING HIGHEST LAYER TOTAL COVERAGEclear FREEZING LEVEL14,084 ft VFR MARGINunlimited

// Sun & Moon · times in Z · bar = local day (UTC-7)

11:41ZSUNRISE
19:32ZSOLAR NOON
03:23ZSUNSET
04:02ZCIVIL END
CURRENT14:25Z DAYLIGHT REMAINING12h 57m VFR NIGHT BEGINS04:02Z (13h 36m) DAY LENGTH15h 42m
Waning Crescent
ILLUMINATION11% MOONRISE09:05Z MOONSET00:47Z FULL MOON IN18 days

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

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

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