曝光台 注意防骗
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weather conditions deteriorate further.
*Note: Where no descent procedure is established, the alternate ceiling and visibility
minima are 1,500FT and 8KM respectively
SPECI will also be issued under the following conditions:
• Wind:
A. when mean direction changes by 30° or more, the mean speed before or
after the change being 20KT or more; or
B. when the mean speed changes by 10KT or more, the mean speed before
or after the change being 30KT or more; or
C. when the variation from the mean speed gusts has increased by 10KT or
more, the mean speed before or after the change being 15KT or more.
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• Other conditions
A. when any of the following begins, ends or changes in intensity -
thunderstorm, hailstorm, mixed snow and rain, freezing precipitation,
drifting snow, dust storm, sandstorm, squall, fog;
B. When severe turbulence, severe icing, or wind shear is reported by a pilot
to have begun or ended;
C. at the passage of a front;
D. at the incidence of any other phenomena likely to be significant to the
operation of an aircraft;
E. when the QNH altimeter setting changes by 2HPA or more;
F. when the temperature changes by 5° or more.
RAAF Special Reports (RAAF SPECI) At joint user aerodromes, Canberra, Darwin,
Newcastle/Williamtown and Townsville, aerodrome weather reports based on a circling
ceiling and visibility minima higher than those specified for civil operations are issued
for use by military pilots.
Aerodrome Weather Reports
• SPECI YMML 2000Z 22012KT 6000 DZ FEW002 SCT006 15/12 Q1020
• METAR YBRK 0100Z 03012KT 9999 FEW025 SCT035TCU 26/20 Q1003
• METAR YPPH 1130Z 28012KT 9999 FEW005 SCT035TCU 26/17 Q1007 RETS
• SPECI YBCS 1745Z 23014G29KT 1200NE 6000 TSRA FEW030CB BKN100 26/22
Q1003
• SPECI YSSY 1900Z 26001KT 3000 HZ VCFG FEW030 18/17 Q1018
Trend-type Forecasts
• TTF SPECI YPAD 2200Z 00000KT 9999 DZ OVC005 14/04 Q 1025
FM2200 00000KT 9999 NO SIG WX BKN008
FM2300 03005KT 9999 NO SIG WX SCT020
• TTF SPECI YMML 0200Z 05008KT 4000 DZ BKN005 OVC100 16/15 Q1017 NOSIG
• TTF METAR YPPH 0500Z 36015KT CAVOK 32/08 Q1014
FM0630 20825KT 9999 NO SIG WX BKN030
INTER 0530/0730 5000 SHRA BKN008
• TTF METAR YBTL 0730Z 35006KT 9999 FEW050TCU 31/21 Q1005
REMARKS DISTANT THUNDER NOSIG
• TTF SPECI YBTL 0800Z 03010KT 4000 TSRA BKN030CB SCT120 27/24 Q1008
FM0830 03005KT 9999 SHRA BKN035
INTER 0830/1100 4000 TSRA SCT010 SCT030CB
• TTF METAR YBAS 1400Z 02015KT 9999 SCT040 BKN120 22/08 Q1000 RMK
DISTANT LIGHTING TO NW
FM1630 34018G35KT 6000 SHRA BKN030 BKN120 INTER 1630/1700 3000 TSRA
SCT010 BKN030CB RMK USE TAF FOR ARRIVALS AFTER 1500Z
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ADVANCED AWS OUTPUT
• The following example represents a METAR which has not had cloud and visibility
observations provided by a human observer. The information provided from the
automated sensors is included in the remarks section of the message: METAR YSBK
1800Z 10015KT //// 14/06 Q1020 RMK CLD:SCT042 BKN110 VIS:9999
• The ceilometer will only detect cloud to 12,500FT. If there is no cloud detected
below this level, and the detected visibility is greater than 1,000M, the report of
cloud will be as follows:
CLD: CLR BLW 125
• If no cloud is detected and the detected visibility is less than, or equal to 1,000M,
the report will indicate:
CLD: SKY MAYBE OBSC
TTF - TREND-TYPE FORECASTS
(1) (2) (3) (4) (5)
TTF METAR Aero- Time of Surface Visibility Present Cloud
OR drome Report wind Weather
TTF SPECI Ident direction
and
speed/
max.
wind OR CAVOK
(6) (7) (8)
Temp- QNH Supplementary Trend
erature Information NOSIG or FM (time 1)
and which is windshear [refer note [refer note (10)]
Dew data and recent (9)]
Point weather (prefixed ‘RE’) INTER/TEMPO
and (time 2) (time 3)
Remarks which is any [refer note (11)]
other significant
comment not covered in
the formal parts. Data
from visionmeters and
ceilometers when
available are included
here.
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NOTES
1. Time of observation in hours and minutes UTC
2. Direction in three figures rounded off to the nearest 10° Aerodrome
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