30.3.3 Date and Time of Report. The date and time the observation is taken are transmitted as a six.digit date/time group appended with Z to denote Coordinated Universal Time (UTC). The first two digits are the date followed with two digits for hour and two digits for minutes.
EXAMPLE.
172345Z (the 17th day of the month at 2345Z)
30.3.4 Modifier (As Required). “AUTO” identi-fies a METAR/SPECI report as an automated weather report with no human intervention. If “AUTO” is shown in the body of the report, the type of sensor equipment used at the station will be encoded in the remarks section of the report. The absence of “AUTO” indicates that a report was made manually by an observer or that an automated report had human augmentation/backup. The modifier “COR” indi-cates a corrected report that is sent out to replace an earlier report with an error.
NOTE.
There are two types of automated stations, AO1 for automated weather reporting stations without a precipita-tion discriminator, and AO2 for automated stations with a precipitation discriminator. (A precipitation discriminator can determine the difference between liquid and frozen/freezing precipitation). This information appears in the remarks section of an automated report.
30.3.5 Wind. The wind is reported as a five digit group (six digits if speed is over 99 knots). The first three digits are the direction from which the wind is blowing, in tens of degrees referenced to true north, or “VRB” if the direction is variable. The next two digits is the wind speed in knots, or if over 99 knots, the next three digits. If the wind is gusty, it is reported as a “G” after the speed followed by the highest gust reported. The abbreviation “KT” is appended to denote the use of knots for wind speed.
EXAMPLE.
13008KT . wind from 130 degrees at 8 knots
08032G45KT . wind from 080 degrees at 32 knots with gusts to 45 knots
VRB04KT . wind variable in direction at 4 knots
00000KT . wind calm
210103G130KT . wind from 210 degrees at 103 knots with gusts to 130 knots
If the wind direction is variable by 60 degrees or more and the speed is greater than 6 knots, a variable group consisting of the extremes of the wind direction separated by a “V” will follow the prevailing wind group.
32012G22KT 280V350
30.3.5.1 Peak Wind. Whenever the peak wind exceeds 25 knots, “PK WND” will be included in Remarks; e.g., PK WND 280045/1955 “Peak wind two eight zero at four five occurred at one niner five five.” If the hour can be inferred from the report time, only the minutes will be appended; e.g., PK WND 34050/38 “Peak wind three four zero at five zero occurred at three eight past the hour.”
30.3.5.2 Wind Shift. Whenever a wind shift occurs, “WSHFT” will be included in remarks followed by the time the wind shift began; e.g., WSHFT 30 FROPA “Wind shift at three zero due to frontal passage.”
30.3.6 Visibility. Prevailing visibility is reported in statute miles with “SM” appended to it.
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