FIG GEN 3.5.24

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 9th to 24Z on the 10th).
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)  .SM 
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 

FIG GEN 3.5.25

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

In METAR, ReMarK indicator & remarks. For example: Sea- Level Pressure in hectoPascals & tenths, as shown: 1004.5 hPa; Temp/ dew-point in tenths °C, as shown: temp. 18.2°C, dew-point 15.9°C  RMK SLP045 T01820159 
FM091930  FroM: changes are expected at: 2-digit date, 2-digit hour, and 2-digit minute beginning time: indicates significant change. Each FM starts on a new line, indented 5 spaces
TEMPO 0920/0922  TEMPOrary: changes expected for <1 hour and in total, < half of the period between the 2-digit date and 2-digit hour beginning, and 2-digit date and 2-digit hour ending time
PROB30 1004/1007  PROBability and 2-digit percent (30 or 40): probable condition in the period between the 2-digit date & 2-digit hour beginning time, and the 2-digit date and 2-digit hour ending time
BECMG 1013/1015  BECoMinG: change expected in the period between the 2-digit date and 2-digit hour beginning time, and the 2-digit date and 2-digit hour ending time 

Table of Significant Present, Forecast and Recent Weather - Grouped in categories and used in the order listed below; or as needed in TAF, No Significant Weather. 
Qualifiers Intensity or Proximity
“-” = Light  No sign = Moderate  “+” = Heavy
“VC” = Vicinity, but not at aerodrome. In the US METAR, 5 to 10 SM from the point of observation. In the US TAF, 5 to 10 SM from the center of the runway complex. Elsewhere, within 8000m. 
Descriptor
　
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