BOM TAF summary

[down3gr33ns]

This is the summary for the latest YMML TAF.

What does the underlined bit (3rd para)mean, and what is "Code Grey" (last para?




TAF SUMMARY:
A SOUTHWESTERLY AIRSTREAM WILL TEND NORTHWESTERLY OVERNIGHT AHEAD OF
A COLD FRONT EXPECTED AROUND MIDDAY. SOME RAIN WILL DEVELOP AHEAD OF
THE FRONT, WITH A GUSTY WESTERLY WIND AND SHOWERS TO FOLLOW.
ASSOCIATED INTER VISIBILITY/CLOUD CEILING DETERORATIONS TO ABOUT
4000M/1000FT ARE EXPECTED.

THUNDERSTORM POTENTIAL WITHIN THE TMA:
10-20% 01-09Z. ANY THUNDERSTORMS SHOULD MOVE QUICKLY FROM THE WEST TO
EAST.

OTHER POSSIBILITIES:
SHOWERS ARE POSSIBLE WHEN NOT ON THE TAF, WITH BRIEF BELOW HAM CLOUD
CEILING/VISIBILITY REDUCTIONS. MORE PERSISTENT CLOUD
CEILING/VISIBILITY REDUCTIONS ARE POSSIBLE WITH THE RAIN AHEAD OF AND
ACCOMPANYING THE FRONT, WHICH COULD VARY IN TIMING BY UP TO 2 HOURS
FROM FORECAST. THE THUNDERSTORM RISK IS INDICATED ABOVE. THERE IS A
SLIGHT RISK OF WIND GUSTS IN EXCESS OF 41 KNOTS WITH PRECIPITATION
FROM LATE MORNING TILL EARLY MONDAY EVENING. WIND GUSTS IN EXCESS OF
25 KNOTS MAY CONTINUE UNTIL THE END OF THE FORECAST PERIOD.

MELBOURNE OUTLOOK:
TUESDAY : PARTLY CLOUDY. CITY MAX: 16
WEDNESDAY : MOSTLY CLOUDY. CITY MAX: 16

CODE GREY:
PROB05 1520/1524 4000 RA BKN010

[Showa Cho]

Below Highest Alternate Minima I'd guess. Mmmmm.....ham.......

[Trent 972]

Google - The Centre for Australian Weather and Climate Research + Code Grey.
Basically 'Code Grey' is Code Grey (Australia)
• “Code Grey provides early advice of a possible later TAF amendment. It is used when there is a small but realistic chance of fog ...”

[maggot]

what trent said, noting that it makes is way onto the forecast when the prob hits 30%.
to be ammended by a flurry of TTFs 30 mins after the fact usually though :}

[down3gr33ns]

Thanks for the replies, makes sense.


Found another one for YBBN (underlined), I understand this one, no f'urries!!



BRISBANE AIRPORT WEATHER BRIEFING
ISSUED AT 0523Z ON THE 15/06/2014 [1523 ON THE 15/06/2014 LOCAL]

BRISBANE TAF: (THIS TAF MAY NOT BE THE LATEST ISSUE)
TAF YBBN 150518Z 1506/1612
25015KT CAVOK
FM150800 24008KT CAVOK
FM152300 21010KT CAVOK
FM160300 17010KT CAVOK
FM160800 21005KT CAVOK
RMK
T 19 15 13 11 Q 1014 1017 1019 1019


TAF SUMMARY:
BONZA WEATHER. DRY AND MODERATE W/SW WINDS WILL EASE OVERNIGHT BEFORE
TENDING LIGHTER AND MORE SOUTHERLY ON MONDAY. CAVOK CONDITIONS TO
CONTNUE TILL TUESDAY OR WEDNESDAY WHEN A MORE SE'LY FLOW WILL
GENERATE MORE CLOUD.

[drpixie]

The BN TAFs are sometimes nicely and amusingly human :D

I asked the briefing officer a similar question once - they were very accessible and helpful.

From memory, they use SAM to mean "special alternate minima" (2 x ILS, etc) and so HAM is "highest alternate minima" which, i suppose, is normal alternate minima.

[MakeItHappenCaptain]

The TAF a few years back had,
"QUEENSLAND TOO WIN" around origin time. Bout 2009 if I remember correctly...

Go the Blues.:E

[drpixie]

They're on NAIPS - under Briefing and then "General Met Forecasts"

[sunnySA]

These "General MET Forecasts" should be included with the products displayed under "Location Briefing".