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Extratropical Storm Ophelia - Technical Analysis Only - MOD NOTE post #1

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Comments

  • #2652
    gozunda
    Registered Users, Registered Users 2 Posts: 18,996 ✭✭✭✭gozunda


    mirrorwall14 wrote: »
    Thank you but I meant for Ophelia, as far as I remember it went offline

    Yup it came back and was providing readings up to now afaik ...


  • #2653
    Gaoth Laidir
    Registered Users, Registered Users 2 Posts: 8,219 ✭✭✭Gaoth Laidir


    Here's a detailed analysis of Ophelia from start to finish.

    https://irishweatheronline.wordpress.com/2017/11/03/hurricane-ophelia-a-detailed-analysis/


  • #2654
    Gaoth Laidir
    Registered Users, Registered Users 2 Posts: 8,219 ✭✭✭Gaoth Laidir


    Strangely, the data seem to be recovered from both Sherkin Island and Cork Airport (see here), but Roches Point is still showing stronger winds than Sherkin. This seems strange, given that Sherkin is much closer to Fastnet and more in line with the core of strongest winds.

    Max 10-minute mean speed (not necessarily from hourly report)
    Roches Point: 62 knots
    Sherkin: 57 knots

    Max gust
    Roches Point: 84 knots
    Sherkin: 74 knots

    The hourly (UTC) reports for Sherkin show:

    Time...Mean...Dir. (°)...SLP (hPa)
    0900...39 kt...160......982.7
    1000...47 kt...150......974.5
    1100...52 kt...170......975.1
    1200...45 kt...210......982.1
    1300...37 kt...230......987.3


  • #2655
    Gaoth Laidir
    Registered Users, Registered Users 2 Posts: 8,219 ✭✭✭Gaoth Laidir


    I see the NHC have put the Fastnet Lighthouse anemometer height as 656 ft amsl (200 metres) in their storm summary. I thought it was a lot lower than that. It puts its high windspeed in perspective if it is correct.

    https://www.nhc.noaa.gov/data/tcr/index.php?season=2017&basin=atl


  • #2656
    sdanseo
    Registered Users, Registered Users 2 Posts: 9,234 ✭✭✭sdanseo


    Gaoth Laidir wrote: »
    I see the NHC have put the Fastnet Lighthouse anemometer height as 656 ft amsl (200 metres) in their storm summary. I thought it was a lot lower than that. It puts its high windspeed in perspective if it is correct.

    https://www.nhc.noaa.gov/data/tcr/index.php?season=2017&basin=atl

    Not a chance the anemometer is at 200m. The light is at 49m and the tower itself tops out at 54m. The yanks no doubt getting confused by non-imperial units again.

    http://www.irishlights.ie/tourism/our-lighthouses/fastnet.aspx
    Height of Tower:

    54 metres

    Height of Light MHWS:

    49 metres


  • #2657
    Gaoth Laidir
    Registered Users, Registered Users 2 Posts: 8,219 ✭✭✭Gaoth Laidir


    The EUMeTrain site has a nice satellite and model analysis of Hurricane Ophelia. There is even a forecasting simulator in which you simulate a Met Éireann forecaster in the run-up to its arrival in Ireland. The clock starts at the start of your shift and runs at speed x20. At various stages you will see tasks appear on the left, which you will need to complete (e.g. analysis, issuing warnings, etc.).

    http://eumetrain.org/resources/Ophelia_2017.htm


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