AIM 8/15/19  12/31/20 7 − 1 − 28. 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) 7 − 1 − 59 Meteorology 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 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 FM 10 0000 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 Key to Aerodrome Forecast (TAF) and Aviation Routine Weather Report (METAR) (Front)