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// Station · 19m ago

KHYI

San Marcos Regional Airport
CAT VFR
WIND 220° / 4 kt
VIS 10+ SM
CEILING CLR
T/Td 35°C / 18.9°C
ALTIM 30.05 inHg
ELEV 597 FT
29.8927°N / 97.8630°W
LOCATION · San Marcos, US
N
WIND
220°4 kt
KHYI · 597 FT
© OSM · CartoDB

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

METRIC
NOW · 17Z
+6H
+12H
+18H
WIND
220°/4
 
 
 
VIS
10+ SM
 
 
 
CEILING
CLR
 
 
 
LAYERS
 
 
 
T / Td
35 / 19
 
 
 
ALTIM
30.05"
 
 
 

// Interpretation

VFR with light winds at 220°/4 kt. 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 KHYI 251756Z 22004KT 10SM CLR 35/19 A3005 RMK AO2 SLP166 T03500189 10350 20222 58004

KHYI · day 25 at 17:56 UTC · wind from 220° at 4 kt · visibility 10+ SM · temp 35°C / dewpoint 19°C · altimeter 30.05" Hg · automated station w/ precipitation discriminator · sea-level pressure 1016.6 mb

// Runway analysis · computed from current METAR wind

Wind 220° @ 4 kt
ALL USABLE · WINDS CALM
N
WIND
220°4 kt
HEADWIND CAUTION · HIGH XW AVOID · TAILWIND
ALL RUNWAYS · CALM WINDS 6 ends
08 HDG 080° CALM 6,330'
26 HDG 260° CALM 6,330'
13 HDG 130° CALM 5,601'
31 HDG 310° CALM 5,601'
17 HDG 170° CALM 5,214'
35 HDG 350° CALM 5,214'
Pattern altitude: 1,597 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 +21°C

3,000FT
+2,403 FT ABOVE FIELD ELEV
// DA · LAST 24 HOURS loading…
FIELD ELEV597 FT OAT+35°C ISA DELTA+21°C PRESSURE ALT464 FT
// Performance equivalent Operating here right now feels like operating at K2F5 (Lamesa Municipal Airport, Lamesa, elev 2,999 ft) on a standard ISA day.
// Aircraft performance impact SIGNIFICANT
TAKEOFF ROLL CLIMB RATE
Single-engine propC172, PA-28, Cherokee
+30%
-21%
Turbo / high-perf pistonSR22T, Bonanza, Mooney
+21%
-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 · clear · no layers reported

FT 0 5k 10k 15k 20k 25k FRZ LVL · 18,274 FT KHYI ELEV · 597 FT
// Reported layers (highest → lowest)
CLR
No reported cloud layers — clear sky from surface to reporting ceiling.
// Computed
CEILING HIGHEST LAYER TOTAL COVERAGEclear FREEZING LEVEL18,274 ft VFR MARGINunlimited

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

12:06ZSUNRISE
18:35ZSOLAR NOON
01:03ZSUNSET
01:28ZCIVIL END
CURRENT18:15Z DAYLIGHT REMAINING6h 48m VFR NIGHT BEGINS01:28Z (7h 12m) DAY LENGTH12h 57m
Waxing Gibbous
ILLUMINATION94% MOONRISE22:12Z MOONSET11:10Z FULL MOON IN2 days

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