// Station · 12m ago

KHEF

Manassas Regional Airport/Harry P. Davis Field

CAT VFR

WIND 300° / 4 kt

VIS 9.0 SM

CEILING CLR

T/Td 23.3°C / 15°C

ALTIM 30.10 inHg

ELEV 192 FT

38.7214°N / 77.5154°W

LOCATION · Manassas, US

WIND

300°4 kt

KHEF · 192 FT

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

METRIC

NOW · 13Z

+6H

+12H

+18H

WIND

300°/4

VIS

9.0 SM

CEILING

CLR

LAYERS

—

T / Td

23 / 15

ALTIM

30.10"

// Interpretation

VFR with light winds at 300°/4 kt. Visibility 9.0 SM 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 KHEF 251356Z 30004KT 9SM CLR 23/15 A3010 RMK AO2 SLP198 T02330150 $

KHEF · day 25 at 13:56 UTC · wind from 300° at 4 kt · visibility 9.0 SM · temp 23°C / dewpoint 15°C · altimeter 30.10" Hg · automated station w/ precipitation discriminator · sea-level pressure 1019.8 mb

// Runway analysis · computed from current METAR wind

Wind 300° @ 4 kt

ALL USABLE · WINDS CALM

WIND

300°4 kt

HEADWIND CAUTION · HIGH XW AVOID · TAILWIND

ALL RUNWAYS · CALM WINDS 4 ends

16L HDG 160° —CALM —— 6,200'

34R HDG 340° —CALM —— 6,200'

16R HDG 160° —CALM —— 3,715'

34L HDG 340° —CALM —— 3,715'

Pattern altitude: 1,192 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 +8°C

1,000FT

+808 FT ABOVE FIELD ELEV

// DA · LAST 24 HOURS loading…

FIELD ELEV192 FT OAT+23°C ISA DELTA+8°C PRESSURE ALT9 FT

// Performance equivalent Operating here right now feels like operating at K8W2 (New Market Airport, New Market, elev 975 ft) on a standard ISA day.

// Aircraft performance impact MINOR

TAKEOFF ROLL CLIMB RATE

Single-engine propC172, PA-28, Cherokee

+10%

-7%

Turbo / high-perf pistonSR22T, Bonanza, Mooney

+7%

-5%

Light jetCJ4, Phenom 300, M2

+4%

-3%

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 LEVEL11,960 ft VFR MARGINunlimited

// Sun & Moon · times in Z · bar = local day (UTC-5)

10:34ZSUNRISE

17:13ZSOLAR NOON

23:53ZSUNSET

00:20ZCIVIL END

CURRENT14:08Z DAYLIGHT REMAINING9h 44m VFR NIGHT BEGINS00:20Z (10h 12m) DAY LENGTH13h 18m

Waxing Gibbous

ILLUMINATION93% MOONRISE20:32Z MOONSET09:51Z 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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