Aeronautical Information Manual (AIM), page 502

Index   501 -- Page 502 -- 503

AIM      CHG 2                                                                                                3/15/07

7-1-29. Key to Aerodrome Forecast (TAF) and Aviation Routine Weather Report (METAR)
FIG 7-1-19 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- METAR hourly, SPECI-special or TESTM-non-commissioned ASOS report 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 9th to 24Z on the 10th). In U.S. METAR: CORrected ob; or AUTOmated ob for automated re­ COR port with no human intervention; omitted when observer logs on. 15005KT Wind: 3 digit true-north direction, nearest 10 degrees (or VaRiaBle); 22015G25KT 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 5SM Prevailing visibility; in U.S., Statute Miles & fractions; above 6 miles in ¾SM TAF Plus6SM. (Or, 4-digit minimum visibility in meters and as re­ quired, lowest value with direction) Runway Visual Range: R; 2-digit runway designator Left, Center, or R28L/2600FT 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) 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 OVC 010CB 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" Temperature: degrees Celsius; first 2 digits, temperature "/" last 2 digits, 18/16 dew-point temperature; Minus for below zero, e.g., M06 Altimeter setting: indicator and 4 digits; in U.S., A-inches and hun­ A2992 dredths; (Q-hectoPascals, e.g., Q1013) 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 7-1-58 Meteorology

Page 502 of the Aeronautical Information Manual (AIM.pdf)
AIM: Official Guide to Basic Flight Information and ATC Procedures

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