Key to ASOS Weather Observations
(Automated Surface Observing System)
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| LOCATION IDENTIFIER | SKY | VISIBILITY, | SEA-LEVEL PRESSURE/ | REMARKS | STATUS |
| TYPE OF REPORT | CONDITION | WEATHER, AND | TEMPERATURE/DEW POINT/ | AUTOMATED REMARKS GENERATED AUTOMATICALLY IF CONDITIONS | REMARKS |
| TIME OF REPORT | AND CEILING | OBSTRUCTIONS | WIND DIRECTION, SPEED AND | EXIST. AUGMENTED REMARKS ADDED IF CONDITIONS EXIST AND | SYSTEM |
| STATION TYPE |BELOW 12,000'| TO VISION |CHARACTER/ALTIMETER SETTING/| CERTIFIED WEATHER OBSERVER IS ATTENDING THE SYSTEM |GENERATED|
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| HTM RS 1755 AO2A | M19V OVC | 1R-F | 125/36/34/2116G241/990/ | R29LVR10V50 CIG 16V22 TWR VSBY 2 PK WND 2032/1732 PRESFR | ZRNO $ |
------------------------------------------------------------------------------------------------------------------------------------------------------LOCATION IDENTIFIER:
3 or 4 alphanumeric characters (usually airport identifier).
TYPE OF REPORT:
SA = Scheduled record (hourly) observation.
SP = Special observation indicating a significant change
in one or more of the observed elements.
RS = SA that also qualifies as an SP.
USP = Urgent special observation to report tornado.
TIME OF REPORT:
Coordinated Universal Time (UTC or Z) using 24-hr clock.
STATION TYPE:
AO2 = Unattended (no observer) ASOS.
AO2A = Attended (observer present) ASOS.
SKY CONDITION AND CEILING BELOW 12,000' AGL:
Sky condition contractions are for each layer in ascending
order. Numbers preceding contractions are base height in
hundreds of feet above ground level (AGL).
CLR BLO 120 = Less than 0.1 sky cover below 12,000'
SCT = Scattered: 0.1 to 0.5 sky cover.
BKN = Broken: 0.6 to 0.9 sky cover.
OVC = Overcast: More than 0.9 sky cover.
A letter preceding the height of a base identifies a ceiling
layer and indicates how ceiling height was determined.
M = Measured W= Indefinite
E = Estimated X = Obscured sky
The letter V is added immediately following the height of a
base to indicate a variable ceiling: see Remarks.
VISIBILITY:
Reported in statute miles and fractions from 1/4 through 10+.
V = variable:see Remarks.
PRESENT WEATHER:
TORNADO (when augmented).
T = Thunder(when augmented): see Status Remarks.
R = Liquid precipitation that does not freeze (e.g., rain).
P- = Light precipitation in unknown form.
ZR = Liquid precipitation that freezes on impact
(e.g., freezing rain): see Status Remarks.
A = Hail (when augmented).
S = Frozen precipitation other than hail (e.g., snow).
+ = Heavy. No sign = Moderate. - = Light.
OBSTRUCTIONS TO VISION:
Reported only when visibility is less than 7 statute miles.
F = Fog H = Haze
VOLCANIC ASH (when augmented).
SEA-LEVEL PRESSURE:
Tenths of Hectopascals (millibars). Shown as last 3 digits
only without decimal point (e.g., 950 = 995.0).
TEMPERATURE AND DEW POINT:
Degrees Fahrenheit.
WIND DIRECTION, SPEED AND CHARACTER:
Direction in tens of degrees from true north. Voice broadcast
in degrees from magnetic. Speed in knots.
0000 = calm. E = estimated. G = gusts. Q = squalls.
Variable wind, peak wind, wind shift: see Remarks.
ALTIMETER SETTING:
Hundredths of inches of mercury. Shown as last 3 digits
only without decimal point (e.g., 005 = 30.05 inches).
MISSING DATA: Reported as M.
DENSITY ALTITUDE: Included on voice broadcast only when 1000
or more feet above airport elevation.
REMARKS: Can Include:
RVR (Runway Visual Range), VOLCANIC ASH, VIRGA,
TWR VSBY (Tower visibility), SFC VSBY (Surface visibility),
VSBY V (Variable visibility), CIG V (Variable ceiling),
WSHFT (Windshift), PK WND (Peak wind), WND V (Variable
wind direction), PCPN (Precipitation amount),
PRESRR (Pressure rising rapidly), PRESFR (Pressure falling
rapidly), PRJMP (Pressure jump), B (Time weather began),
E (Time weather ended).
STATUS REMARKS:
PWINO = Present weather information not available.
ZRNO = Freezing rain information not available.
TNO = Thunderstorm information not available.
$ = Maintenance check indicator.
DECODED REPORT: Hometown Municipal Airport,
record special observation at 1755 UTC. ASOS with observer. Measured
ceiling 1900 feet variable, overcast. Visibility 1 mile, light rain,
fog. Sea-level pressure 1012.5 hectopascals, temperature 36'F, dew
point 34'F, wind from 210' true at 16 knots gusting to 24 knots,
altimeter 29.90 inches. Runway 29L visual range 1000 variable to 5000
feet. Ceiling 1600 variable to 2200 feet, tower visibility 2 miles,
peak wind 200' true at 32 knots at 1732 UTC, pressure falling rapidly.
Freezing rain information not available, maintenance check indicator.
NOTE: Refer to ASOS Guide for Pilots and the Airman's
Information Manual for more information. Refer to the Airport/Facility
Directory, aeronautical charts, and related publications for
broadcast, telephone and location data. Check Notices to Airmen for
ASOS system status.
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