background image

AIM

10/12/17

7−1−60

Meteorology

7−1−30. Key to Aerodrome Forecast (TAF) and Aviation Routine Weather Report (METAR)

FIG 7−1−21

Key to Aerodrome Forecast (TAF) and Aviation Routine Weather Report (METAR) (Front)

Key to Aerodrome Forecast (TAF) and Aviation

Routine Weather Report (METAR) (Front)

 

TAF

KPIT 091730Z 0918/1024 15005KT 5SM HZ FEW020 WS010/31022KT

FM091930 30015G25KT 3SM SHRA OVC015
TEMPO 0920/0922 1/2SM +TSRA OVC008CB
FM100100 27008KT 5SM SHRA BKN020 OVC040
PROB30 1004/1007 1SM -RA BR
FM101015 18005KT 6SM -SHRA OVC020
BECMG 1013/1015 P6SM NSW SKC

NOTE: Users are cautioned to confirm 

DATE and TIME of the TAF. For example FM100000 is

0000Z on the 10th. Do not confuse with 

1000Z!

METAR KPIT 091955Z COR 22015G25KT 3/4SM R28L/2600FT TSRA OVC010CB 18/16 A2992 RMK
SLP045 T01820159

Forecast

Explanation

Report

TAF

Message type: TAF-routine or TAF AMD-amended forecast, METAR-
hourly, SPECI-special or TESTM-non-commissioned ASOS report

METAR

KPIT

ICAO location indicator

KPIT

091730Z

Issuance time:  ALL times in UTC “Z”, 2-digit date, 4-digit time

091955Z

0918/1024

Valid period, either 24 hours or 30 hours.  The first two digits of EACH
four digit number indicate the date of the valid period, the final two di­
gits indicate the time (valid from 18Z on the 9

th

 to 24Z on the 10

th

).

In U.S. METAR: CORrected ob; or AUTOmated ob for automated re­
port with no human intervention; omitted when observer logs on.

COR

15005KT

Wind: 3 digit true-north direction, nearest 10 degrees (or VaRiaBle);
next 2-3 digits for speed and unit, KT (KMH or MPS); as needed, Gust
and maximum speed; 00000KT for calm; for METAR, if direction varies
60 degrees or more, Variability appended, e.g., 180V260

22015G25KT

5SM

Prevailing visibility; in U.S., Statute Miles & fractions; above 6 miles in
TAF Plus6SM. (Or, 4-digit minimum visibility in meters and as re­
quired, lowest value with direction)

¾SM

Runway Visual Range: R; 2-digit runway designator Left, Center, or
Right as needed; “/”, Minus or Plus in U.S., 4-digit value, FeeT in U.S.,
(usually meters elsewhere); 4-digit value Variability 4-digit value (and
tendency Down, Up or No change)

R28L/2600FT

HZ

Significant present, forecast and recent weather: see table (on back)

TSRA

FEW020

Cloud amount, height and type: Sky Clear 0/8, FEW >0/8-2/8, ScaTtered
3/8-4/8, BroKeN 5/8-7/8, OverCast 8/8; 3-digit height in hundreds of ft;
Towering Cumulus or CumulonimBus in METAR; in TAF, only CB.
Vertical Visibility for obscured sky and height “VV004”. More than 1
layer may be reported or forecast. In automated METAR reports only,
CleaR for “clear below 12,000 feet”

OVC 010CB

Temperature: degrees Celsius; first 2 digits, temperature “/” last 2 digits,
dew-point temperature; Minus for below zero, e.g., M06

18/16

Altimeter setting: indicator and 4 digits; in U.S., A-inches and hun­
dredths; (Q-hectoPascals, e.g., Q1013)

A2992

WS010/31022KT

In U.S. TAF, non-convective low-level (≤ 2,000 ft) Wind Shear; 3-digit
height (hundreds of ft); “/”; 3-digit wind direction and 2-3 digit wind
speed above the indicated height, and unit, KT