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Storm Barra - December 7th/8th 2021

  • 03-12-2021 5:04pm
    #1
    Registered Users Posts: 1,815 ✭✭✭ squarecircles


    There is growing concern that a strong wind event will impact parts of Ireland next Tuesday/Wednesday.

    Met Eireann have taken the unusual precaution of issuing a weather advisory to alert the public several

    days in advance of the approaching storm, stating that warnings will be issued on Sunday.

    Weather Advisory for Ireland

    A spell of wet and very windy weather is expected to impact Ireland on Tuesday 7th and Wednesday the 8th December, with potential impacts including travel disruption and coastal flooding. There is also the potential for wintry precipitation on Tuesday night and Wednesday which may lead to further travel disruptions.This advisory will be updated on Saturday while warnings will likely be issued on Sunday.

    for more details see: https://www.met.ie/forecasts/meteorologists-commentary

    Valid: 16:15 Friday 03/12/2021 to 18:00 Wednesday 08/12/2021

    Issued: 16:16 Friday 03/12/2021


    Storm depression approaching Ireland Tuesday 7th December 2021

    Meteorologists Emer Flood & Paul Downes

    A deepening Atlantic depression will bring a spell of windy and wet weather to Ireland on Tuesday and Wednesday.

     For latest advisories and warnings:  https://www.met.ie/warnings/today

    This storm depression will develop in the mid-Atlantic on Monday as a result of dynamic forcing from jet streaks in the upper atmosphere. This depression will rapidly deepen upon its approach to Ireland as it tracks northeastwards over the Atlantic.

    The associated wind field will reach Ireland from Monday night. The cyclone’s centre will be around 950 to 960hPa deep as it approaches the west coast on Tuesday morning.

    The exact track and timing of the cyclone is not definite at this stage as there have been small differences between successive model runs. Therefore, the location and timing of the strongest gusts is not certain yet, but Atlantic coastal counties will likely experience the strongest winds during Tuesday.

    The depression will likely move slowly eastwards over or near Ireland overnight Tuesday and during Wednesday as it starts to fill and weaken. It will likely track eastwards away from Ireland overnight Wednesday pull in a cold polar airmass in its wake.

     

    Possible Impacts

    This cyclone will bring gales across much of Ireland during Tuesday, with damaging gusts likely in some areas, and gales or strong gales developing in most sea areas, with storm force winds possible for a time at times on Tuesday.

    The strengthening winds will be accompanied by a spell of heavy rain on Tuesday, followed by heavy showers. Showers will continue overnight Tuesday and through Wednesday. With colder air wrapping around the depression centre and pulled over Ireland on Wednesday, there is potential for some of the showers to fall as sleet, or snow on high ground.

    We are currently entering a period of Spring tides with the peak expected on Monday; however coastal levels are expected to remain NORMAL over the weekend and into Monday due to low surge levels forecast. Coastal levels are expect to be ELEVATED later on Monday night and Tuesday as a deep low pressure system approaches from the Atlantic and due to the coincidence of high spring tides, strong and gusty winds, and expected large surge levels. There is still uncertainty between model runs on the timing and path of the low pressure system, which should improve as future model runs become available.

    Post edited by DOCARCH on


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