// Station · 22m ago

KGTF

Great Falls International Airport

CAT VFR

WIND CALM

VIS 10+ SM

CEILING CLR

T/Td 21.1°C / 7.8°C

ALTIM 30.27 inHg

ELEV 3,680 FT

47.4820°N / 111.3710°W

LOCATION · Great Falls, US

WIND

000°0 kt

KGTF · 3,680 FT

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

METRIC

NOW · 17Z

+6H

+12H

+18H

WIND

CALM

VIS

10+ SM

CEILING

CLR

LAYERS

—

T / Td

21 / 8

ALTIM

30.27"

// 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 251753Z 00000KT 10SM CLR 21/08 A3027 RMK AO2 SLP231 T02110078 10211 20078 58008

KGTF · day 25 at 17:53 UTC · winds calm · visibility 10+ SM · temp 21°C / dewpoint 8°C · altimeter 30.27" Hg · automated station w/ precipitation discriminator · sea-level pressure 1023.1 mb

// Runway analysis · computed from current METAR wind

Wind CALM

ALL USABLE · WINDS CALM

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

4,900FT

+1,220 FT ABOVE FIELD ELEV

// DA · LAST 24 HOURS loading…

FIELD ELEV3,680 FT OAT+21°C ISA DELTA+13°C PRESSURE ALT3,329 FT

// Performance equivalent Operating here right now feels like operating at K7S1 (Ruby Valley Field, Twin Bridges, elev 4,777 ft) on a standard ISA day.

// Aircraft performance impact MODERATE

TAKEOFF ROLL CLIMB RATE

Single-engine propC172, PA-28, Cherokee

+49%

-34%

Turbo / high-perf pistonSR22T, Bonanza, Mooney

+34%

-22%

Light jetCJ4, Phenom 300, M2

+20%

-15%

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 LEVEL14,337 ft VFR MARGINunlimited

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

12:36ZSUNRISE

19:29ZSOLAR NOON

02:21ZSUNSET

02:54ZCIVIL END

CURRENT18:15Z DAYLIGHT REMAINING8h 06m VFR NIGHT BEGINS02:54Z (8h 39m) DAY LENGTH13h 45m

Waxing Gibbous

ILLUMINATION94% MOONRISE22:42Z MOONSET12:28Z FULL MOON IN2 days

// Nearest reporting stations

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// Area map · 60 NM radius · CartoDB Dark Matter + aeronautical overlay

AIRSPACE

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