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Aviation weather thread

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    #122
    Gaoth Laidir
    Registered Users Posts: 8,219 ✭✭✭Gaoth Laidir


    Frost on R16 at DUB this morning, braking action medium - good. R28 just damp, braking action good.

    METAR:
    EIDW 100630Z 27011KT 1500 BR SCT001 00/00 Q0996 R10/190095 R16/390094 TEMPO 0500

    Could be 200 m visibility in the next few hours too.

    TAF:
    TAF AMD EIDW 100615Z 1006/1106 28010KT 4000 BR SCT001
    TEMPO 1006/1010 0200 FG BKN001
    BECMG 1010/1012 9999 NSW SCT020
    BECMG 1018/1021 23005KT
    PROB30 TEMPO 1020/1024 -SHRA BKN010
    TEMPO 1103/1106 3000 BR BKN010
    PROB30 TEMPO 1104/1106 0400 FG BKN001


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    #123
    JCX BXC
    Registered Users Posts: 18,114 ✭✭✭✭JCX BXC


    Nothing like a bit of surprise fog! VIS 900m at 8am and temp of 0c.


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    #124
    Gaoth Laidir
    Registered Users Posts: 8,219 ✭✭✭Gaoth Laidir


    And it was a pretty drastic fall in visibility too. Visibility was
    40 km at 6 am
    1.5 km at 7 am,
    900 m at 8 am,
    9 km at 9 and 10 am and now back up to 25 km.


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    #125
    JCX BXC
    Registered Users Posts: 18,114 ✭✭✭✭JCX BXC


    40km? I thought the readings only went to 10km or more?

    That's often the nature of early morning fog anyway from my experience. Comes out of nowhere and can be gone just as quick.


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    #126
    Gaoth Laidir
    Registered Users Posts: 8,219 ✭✭✭Gaoth Laidir


    Carnacalla wrote: »
    40km? I thought the readings only went to 10km or more?

    That's often the nature of early morning fog anyway from my experience. Comes out of nowhere and can be gone just as quick.

    The hourly FM-12 synops give full visibility data, even in different directions if needed.

    This was Dublin at 6 am. The visibility 82 (in bold) means 40 km.

    AAXX 10061 03969 11182 12706 10005 20004 39861 49966 52015 69952 81600
    333 20004 31101 55001 81702=


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    #127
    Gaoth Laidir
    Registered Users Posts: 8,219 ✭✭✭Gaoth Laidir


    It's back up to 50 km at DUB now and also SNN and NOC.

    40 km and BAL and 30 km at ORK.


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    #128
    JCX BXC
    Registered Users Posts: 18,114 ✭✭✭✭JCX BXC


    Taf's for all 4 major Irish airports forecasting a TEMPO of fog overnight. Met Eireann have also dense fog in their general populace forecast for tonight.

    Do Met Eireann make the TAF's for the airports, or is it another agency?


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    #129
    Negative_G
    Registered Users Posts: 1,342 ✭✭✭Negative_G


    Carnacalla wrote: »
    Taf's for all 4 major Irish airports forecasting a TEMPO of fog overnight. Met Eireann have also dense fog in their general populace forecast for tonight.

    Do Met Eireann make the TAF's for the airports, or is it another agency?

    TAFs are made using met eireann data as well as other sources like the British met service data. The forecaster at the airport will then draw up a TAF based on their opionin.

    Several of the larger airports and Baldonnel have their own met offices with their own forecasters on site 24/7.


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    #130
    Gaoth Laidir
    Registered Users Posts: 8,219 ✭✭✭Gaoth Laidir


    TAFs for the Republic's airports are only generated by the Met Eireann aviation forecasters at Shannon. For the North they are issued by the UKMO.

    With the exception of Shannon there are no forecasters at any of the airports. There are observers at DUB, BAL, ORK (and during the day at NOC). They only issue METARs and SYNOP reports but not TAFs. They can, however, issue the TREND or TEMPO forecasts that can come at the end of a METAR. At the regional airports the tower personnel act as observers too and issue the METARs.

    In any case, all these at observers at SNN, ORK, NOC and BAL will be done away with and they will become fully automatic stations in the near future. What a shame. Only DUB will remain manned.


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    #131
    JCX BXC
    Registered Users Posts: 18,114 ✭✭✭✭JCX BXC


    Gaoth Laidir wrote: »
    TAFs for the Republic's airports are only generated by the Met Eireann aviation forecasters at Shannon. For the North they are issued by the UKMO.

    With the exception of Shannon there are no forecasters at any of the airports. There are observers at DUB, BAL, ORK (and during the day at NOC). They only issue METARs and SYNOP reports but not TAFs. They can, however, issue the TREND or TEMPO forecasts that can come at the end of a METAR. At the regional airports the tower personnel act as observers too and issue the METARs.

    In any case, all these at observers at SNN, ORK, NOC and BAL will be done away with and they will become fully automatic stations in the near future. What a shame. Only DUB will remain manned.

    Would the forecasters at SNN not issue the METARS in the future?


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    #132
    Gaoth Laidir
    Registered Users Posts: 8,219 ✭✭✭Gaoth Laidir


    Carnacalla wrote: »
    Would the forecasters at SNN not issue the METARS in the future?

    You mean issue the SNN METARs? No, I don't think so. An observer's job is very different to that of a forecaster. The METARs for all except DUB and the Regionals during the day will be AUTO. Maybe Knock will use the tower personnel as observers too, I'm not sure, but its SYNOP reports will be fully automatic. Unfortunately it doesn't have Present-weather instrumentation like most of the other automatic stations around the country, which is a pity as it is the one place that sees the most action (fog, snow, etc.)! I hope they will install a TUCSON station there to rectify this.


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    #133
    Negative_G
    Registered Users Posts: 1,342 ✭✭✭Negative_G


    Gaoth Laidir wrote: »
    TAFs for the Republic's airports are only generated by the Met Eireann aviation forecasters at Shannon. For the North they are issued by the UKMO.

    With the exception of Shannon there are no forecasters at any of the airports. There are observers at DUB, BAL, ORK (and during the day at NOC). They only issue METARs and SYNOP reports but not TAFs. They can, however, issue the TREND or TEMPO forecasts that can come at the end of a METAR. At the regional airports the tower personnel act as observers too and issue the METARs.

    In any case, all these at observers at SNN, ORK, NOC and BAL will be done away with and they will become fully automatic stations in the near future. What a shame. Only DUB will remain manned.

    Do you have a link regarding the closure of said met stations?

    The meteorologists at these stations can also issue SPECI's on request as well and I have heard it requested and subsequently issued albeit not very frequently.


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    #134
    Gaoth Laidir
    Registered Users Posts: 8,219 ✭✭✭Gaoth Laidir


    Negative_G wrote: »
    Do you have a link regarding the closure of said met stations?

    The meteorologists at these stations can also issue SPECI's on request as well and I have heard it requested and subsequently issued albeit not very frequently.

    The stations won't be closed, they will just become automatic. This was told to me personally by Met Eireann and there was a subsequent job vacancy for head of aviation services posted, which described this change in more detail. The link is still here but the vacancy is no longer listed on publicjobs.ie as the closing date was I think in January.

    http://www.met.ie/vacancies/

    And yes, a SPECI is just a METAR issued outside the half-hourly schedule. Automatic stations also issue these.


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    #135
    Gaoth Laidir
    Registered Users Posts: 8,219 ✭✭✭Gaoth Laidir


    Actually I knew there was a thread about this somewhere. Found it!

    http://touch.boards.ie/thread/2057431735/1/#post95516455


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    #136
    Gaoth Laidir
    Registered Users Posts: 8,219 ✭✭✭Gaoth Laidir


    This is a .pdf of the job advert. The closing date was actually last May.

    http://www.environ.ie/en/Publications/CorporateServices/CustomerServices/FileDownLoad,41342,en.pdf


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    #137
    Gaoth Laidir
    Registered Users Posts: 8,219 ✭✭✭Gaoth Laidir


    Knock down to 300 m vis at 7 am.

    METAR EIKN 120700Z 03006KT 0300 R27/0450 FG BKN001 BKN004 M01/M01 Q0991 NOSIG=

    At 6 am the METAR gave visibility >10 km but the synop gave 8 km. That is because the METAR gives prevailing visibility (the greatest visibility through at least half of the horizon) whereas the synop gives the minimum visibility observed in any direction. Looking at synops as well as METARs can give some extra info and confidence if planning say a general aviation flight across Ireland in a fog-prone setup.

    Latest synops here http://www.ogimet.com/ultimos_synops.php?lang=en&estado=Irel&fmt=html&Send=Send

    Guide to decoding the basic parameters here http://weather.unisys.com/wxp/Appendices/Formats/SYNOP.html

    For a full guide see the WMO's 306 Guide to Codes pdf.


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    #138
    JCX BXC
    Registered Users Posts: 18,114 ✭✭✭✭JCX BXC


    Down to 200m at 8am with an RVR of 250m.
    Temperature also -2


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    #139
    Gaoth Laidir
    Registered Users Posts: 8,219 ✭✭✭Gaoth Laidir


    Carnacalla wrote: »
    Down to 200m at 8am with an RVR of 250m.
    Temperature also -2

    Temperature and dewpoint both -1.6 °C so 100% saturation.


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    #140
    JCX BXC
    Registered Users Posts: 18,114 ✭✭✭✭JCX BXC


    10:30 reports give 100m and an RVR of 100m


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    #141
    Gaoth Laidir
    Registered Users Posts: 8,219 ✭✭✭Gaoth Laidir


    Carnacalla wrote: »
    10:30 reports give 100m and an RVR of 100m

    Nothing ain't going nowhere in that...


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    #142
    JCX BXC
    Registered Users Posts: 18,114 ✭✭✭✭JCX BXC


    Gaoth Laidir wrote: »
    Nothing ain't going nowhere in that...

    3 aircraft in the hold, look at the FR24 thread


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    #143
    Gaoth Laidir
    Registered Users Posts: 8,219 ✭✭✭Gaoth Laidir


    Temperature at Knock now +0.9 °C but the dewpoint is -1.7 °C yielding 83% r.h. so we'll probably see the fog starting to clear there soon.


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    #144
    JCX BXC
    Registered Users Posts: 18,114 ✭✭✭✭JCX BXC


    Gaoth Laidir wrote: »
    Temperature at Knock now +0.9 °C but the dewpoint is -1.7 °C yielding 83% r.h. so we'll probably see the fog starting to clear there soon.

    Finally cleared between 14:00-14:30.
    8000m now.


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    #145
    Gaoth Laidir
    Registered Users Posts: 8,219 ✭✭✭Gaoth Laidir


    Nice example of the extra info a synop report can give. The 3 pm one for Knock (WMO code 03973) gives a minimum visibility of 8 km (***58), but it is 15 km to the northwest only (the 987**group). ***65=15 km.

    AAXX 12151 03973 41358 81003 10034 20032 39675 49928 57005 72842 886//
    333 85706 88712 98765=

    The METAR for the same time also gave 8 km as that is the prevailing visibility over at least half of the horizon.


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    #146
    JCX BXC
    Registered Users Posts: 18,114 ✭✭✭✭JCX BXC


    Bit of fog moving in and out of cork in the past few hours.

    Currently 1200m in shallow fog.


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    #147
    JCX BXC
    Registered Users Posts: 18,114 ✭✭✭✭JCX BXC


    Kerry airport the coldest airport at 8am this morning! It has a temp of -4c. This compares with +2c at the normally cold Knock airport.


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    #148
    Gaoth Laidir
    Registered Users Posts: 8,219 ✭✭✭Gaoth Laidir


    Carnacalla wrote: »
    Kerry airport the coldest airport at 8am this morning! It has a temp of -4c. This compares with +2c at the normally cold Knock airport.

    Casement got down to -4.5 °C.


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    #149
    JCX BXC
    Registered Users Posts: 18,114 ✭✭✭✭JCX BXC


    Gaoth Laidir wrote: »
    Casement got down to -4.5 °C.

    Not at 8am.


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    #150
    Gaoth Laidir
    Registered Users Posts: 8,219 ✭✭✭Gaoth Laidir


    Carnacalla wrote: »
    Not at 8am.

    I know, I was just saying. It was actually the coldest station on the island of Ireland.


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    #151
    JCX BXC
    Registered Users Posts: 18,114 ✭✭✭✭JCX BXC


    Dublin's Temperature has been fairly jumpy!

    20:00 0c
    20:30 -3c
    21:00 -1c
    21:30 -3c
    22:00 -2c


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