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// Station · 11m ago

KHEF

Manassas Regional Airport/Harry P. Davis Field
CAT VFR
WIND CALM
VIS 10+ SM
CEILING CLR
T/Td 15°C / 14.4°C
ALTIM 29.95 inHg
ELEV 192 FT
38.7214°N / 77.5154°W
LOCATION · Manassas, US
N
WIND
000°0 kt
KHEF · 192 FT
© OSM · CartoDB

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

METRIC
NOW · 00Z
+6H
+12H
+18H
WIND
CALM
 
 
 
VIS
10+ SM
 
 
 
CEILING
CLR
 
 
 
LAYERS
—
 
 
 
T / Td
15 / 14
 
 
 
ALTIM
29.95"
 
 
 

// 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 KHEF 130056Z 00000KT 10SM CLR 15/14 A2995 RMK AO2 SLP148 T01500144 $

KHEF · day 13 at 00:56 UTC · winds calm · visibility 10+ SM · temp 15°C / dewpoint 14°C · altimeter 29.95" Hg · automated station w/ precipitation discriminator · sea-level pressure 1014.8 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 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 +0°C

200FT
+8 FT ABOVE FIELD ELEV
// DA · LAST 24 HOURS loading…
FIELD ELEV192 FT OAT+15°C ISA DELTA+0°C PRESSURE ALT160 FT
// Performance equivalent Operating here right now feels like operating at KOFP (Hanover County Municipal Airport, Hanover, elev 207 ft) on a standard ISA day.
// Aircraft performance impact ENHANCED
TAKEOFF ROLL CLIMB RATE
Single-engine propC172, PA-28, Cherokee
+2%
-1%
Turbo / high-perf pistonSR22T, Bonanza, Mooney
+1%
-1%
Light jetCJ4, Phenom 300, M2
+1%
-1%

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

FT 0 5k 10k 15k 20k 25k FRZ LVL · 7,768 FT KHEF ELEV · 192 FT
// Reported layers (highest → lowest)
CLR
No reported cloud layers — clear sky from surface to reporting ceiling.
// Computed
CEILING— HIGHEST LAYER— TOTAL COVERAGEclear FREEZING LEVEL7,768 ft VFR MARGINunlimited

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

11:17ZSUNRISE
16:57ZSOLAR NOON
22:38ZSUNSET
23:04ZCIVIL END
CURRENT01:07Z DAYLIGHT REMAINING0m VFR NIGHT BEGINS23:04Z (past) DAY LENGTH11h 20m
Waxing Crescent
ILLUMINATION3% MOONRISE12:38Z MOONSET23:59Z FULL MOON IN13 days

// Nearest reporting stations

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

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