// Station · 10m ago

KBTM

Bert Mooney Airport

CAT IFR

WIND CALM

VIS 2.0 SM

CEILING OVC at 600 ft

T/Td 6.7°C / 6.1°C

ALTIM 29.89 inHg

WX BR

ELEV 5,550 FT

45.9548°N / 112.4970°W

LOCATION · Butte, US

WIND

000°0 kt

KBTM · 5,550 FT

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

METRIC

NOW · 10Z

+6H

+12H

+18H

WIND

CALM

VIS

2.0 SM

CEILING

OVC006

LAYERS

SCT002 OVC006

T / Td

7 / 6

ALTIM

29.89"

// Interpretation

IFR conditions — ceiling 600 ft. Winds calm, visibility 2.0 SM, scattered at 200 ft, and overcast at 600 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 KBTM 271039Z AUTO 00000KT 2SM BR SCT002 OVC006 07/06 A2989 RMK AO2 T00670061

KBTM · day 27 at 10:39 UTC · winds calm · visibility 2.0 SM · scattered layer at 200 ft · overcast at 600 ft · temp 7°C / dewpoint 6°C · altimeter 29.89" Hg · weather: BR · automated station w/ precipitation discriminator

// 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 4 ends

15 HDG 150° —CALM —— 9,000'

33 HDG 330° —CALM —— 9,000'

12 HDG 120° —CALM —— 5,100'

30 HDG 300° —CALM —— 5,100'

Pattern altitude: 6,550 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 +3°C

5,900FT

+350 FT ABOVE FIELD ELEV

// DA · LAST 24 HOURS ↘ -800 FT

24h AGO18h12h6hNOW

FIELD ELEV5,550 FT OAT+7°C ISA DELTA+3°C PRESSURE ALT5,577 FT

// Performance equivalent Operating here right now feels like operating at KTRK (Truckee Tahoe Airport, Truckee, elev 5,900 ft) on a standard ISA day.

// Aircraft performance impact SIGNIFICANT

TAKEOFF ROLL CLIMB RATE

Single-engine propC172, PA-28, Cherokee

+59%

-41%

Turbo / high-perf pistonSR22T, Bonanza, Mooney

+41%

-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 · 2 reported · highest to lowest

// Reported layers (highest → lowest)

OVC006

Overcast · base 600 ft AGL · 8 oktas

SCT002

Scattered · base 200 ft AGL · ~3–4 oktas

// Computed

CEILING600 ft AGL HIGHEST LAYER600 ft TOTAL COVERAGE~100% (overcast) FREEZING LEVEL8,934 ft VFR MARGIN-2,400 ft

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

11:47ZSUNRISE

19:28ZSOLAR NOON

03:09ZSUNSET

03:46ZCIVIL END

CURRENT10:49Z DAYLIGHT REMAINING16h 20m VFR NIGHT BEGINS03:46Z (16h 56m) DAY LENGTH15h 21m

Waxing Gibbous

ILLUMINATION83% MOONRISE20:30Z MOONSET11:52Z FULL MOON IN4 days

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

KHLN

VFR

Helena Regional Airport · Helena

WIND: VRB / 3 kt
VIS: 10+ SM
CEILING: CLR
DIST: 45 NM NE
AGE: 56m ago

KBZN

VFR

Bozeman Yellowstone International Airport · Bozeman

WIND: 160° / 4 kt
VIS: 10+ SM
CEILING: FEW110
DIST: 57 NM E
AGE: 53m ago

KSMN

VFR

Lemhi County Airport · Salmon

WIND: CALM
VIS: 7.0 SM
CEILING: FEW002
DIST: 77 NM SW
AGE: 6m ago

KLVM

VFR

Mission Field · Livingston

WIND: 280° / 5 kt
VIS: 10+ SM
CEILING: CLR
DIST: 87 NM E
AGE: 56m ago

KMSO

MVFR → VFR 22Z

Missoula Montana Airport · Missoula

WIND: 270° / 4 kt
VIS: 10+ SM
CEILING: OVC026
DIST: 88 NM NW
AGE: 56m ago

// Area map · 100 NM radius · CartoDB Dark Matter + aeronautical overlay

AIRSPACE

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