// Station · 15m ago

KHLN

Helena Regional Airport

CAT MVFR

WIND 280° / 4 kt

VIS 10+ SM

CEILING OVC at 3,000 ft

T/Td 1.7°C / -2.8°C

ALTIM 29.98 inHg

ELEV 3,877 FT

46.6068°N / 111.9830°W

LOCATION · Helena, US

WIND

280°4 kt

KHLN · 3,877 FT

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

METRIC

NOW · 00Z

+6H

+12H

+18H

WIND

280°/4

VIS

10+ SM

CEILING

OVC030

LAYERS

OVC030

T / Td

2 / -3

ALTIM

29.98"

// Interpretation

MVFR — ceiling 3,000 ft. Light winds at 280°/4 kt, visibility better than 10 statute miles, overcast at 3,000 ft. Would drop to IFR below 1,000 ft ceiling or 3 SM visibility, or rise back to VFR above 3,000 ft and 5 SM.

Loading TAF forecast narrative…

SOURCES · NOAA Aviation Weather Center METAR (TAF loading…)

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// Raw observation METAR string + decoded

METAR KHLN 130053Z 28004KT 10SM OVC030 02/M03 A2998 RMK AO2 SLP197 T00171028 $

KHLN · day 13 at 00:53 UTC · wind from 280° at 4 kt · visibility 10+ SM · overcast at 3,000 ft · temp 2°C / dewpoint -3°C · altimeter 29.98" Hg · automated station w/ precipitation discriminator · sea-level pressure 1019.7 mb

// Runway analysis · computed from current METAR wind

Wind 280° @ 4 kt

ALL USABLE · WINDS CALM

WIND

280°4 kt

HEADWIND CAUTION · HIGH XW AVOID · TAILWIND

ALL RUNWAYS · CALM WINDS 6 ends

09 HDG 090° —CALM —— 9,000'

27 HDG 270° —CALM —— 9,000'

05 HDG 050° —CALM —— 4,644'

23 HDG 230° —CALM —— 4,644'

16 HDG 160° —CALM —— 2,989'

34 HDG 340° —CALM —— 2,989'

Pattern altitude: 4,877 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 -6°C

3,100FT

-777 FT BELOW FIELD ELEV

// DA · LAST 24 HOURS loading…

FIELD ELEV3,877 FT OAT+2°C ISA DELTA-6°C PRESSURE ALT3,815 FT

// Performance equivalent Operating here right now feels like operating at K7S0 (Ronan Airport, Ronan, elev 3,086 ft) on a standard ISA day.

// Aircraft performance impact ENHANCED

TAKEOFF ROLL CLIMB RATE

Single-engine propC172, PA-28, Cherokee

+31%

-22%

Turbo / high-perf pistonSR22T, Bonanza, Mooney

+22%

-14%

Light jetCJ4, Phenom 300, M2

+12%

-9%

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 · 1 reported · highest to lowest

// Reported layers (highest → lowest)

OVC030

Overcast · base 3,000 ft AGL · 8 oktas

// Computed

CEILING3,000 ft AGL HIGHEST LAYER3,000 ft TOTAL COVERAGE~100% (overcast) FREEZING LEVEL4,736 ft VFR MARGIN+0 ft

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

13:42ZSUNRISE

19:15ZSOLAR NOON

00:48ZSUNSET

01:19ZCIVIL END

CURRENT01:08Z DAYLIGHT REMAINING0m VFR NIGHT BEGINS01:19Z (10m) DAY LENGTH11h 06m

Waxing Crescent

ILLUMINATION3% MOONRISE15:03Z MOONSET02:09Z FULL MOON IN13 days

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

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