![]() ![]() When severe weather is expected, weather and impacts at lower levels are also likely to be experienced. In any individual weather event, not every location in the warning area may experience the same degree of weather or impacts. IMPACT CONSIDERATIONS: These numerical criteria are strong guidelines but impacts from wind/rain/snow etc., vary depending on location, recent weather conditions, the state of ground, the time of year as well as the duration of the event. The criteria for the different warnings levels (Yellow, Orange, Red) and the different weather elements are laid out in the tables below. An example would be when heavy rain was expected which might not quite meet the “Orange Warning” criteria but which might give rise to significant flooding because of already saturated ground, or because of a combination of rain, wind and tide in a coastal location. Given that the thrust of the Weather Warnings service is on potential “Impacts” of weather rather than on the numerical values attained by the weather elements themselves, it may on occasion be appropriate to issue warnings at a level higher than that strictly justified by the anticipated weather elements. Normally, however, a Weather Advisory (see above) will be used to flag severe weather beyond 60 hrs and Advisories will normally anticipate only “Orange” or “Red” criteria weather hazards. However on some occasions (weekends, holiday periods) it may be necessary to issue Weather Warnings beyond this 60-hr horizon, if sufficient certainty derives from examination of the weather charts. ![]() There will be judgement required on the part of the forecaster who must weigh up the possible severity of the weather conditions and the likelihood of their occurrence. In general Weather Warnings will be issued whenever weather conditions meeting the detailed thresholds defined below are anticipated within a 60-hr period. When Will The Weather Warnings Be Issued? The issue of Weather Warnings and Weather Advisories is at all times down to the judgement of the Met Éireann Meteorologists/Forecasters. They might also be used to advise of expected significant medium-term accumulations of rain during a very unsettled period, when soils are known to be saturated. Another possible use would be to advise of wind speed and direction on occasions of Volcanic Ash contamination. winds which may not be up to warnings strength but which, when combined with high tides and significant swell, generate a risk of flooding. They may also be employed when a sum of weather elements acting together create a significant hazard, e.g. ![]() Weather Advisories are issued up to about a week ahead to provide early information on potential hazardous weather. Met Éireann provides the weather briefings at the NECG, which brings together all Government Departments and relevant agencies and organisations, to support the locally led response and ensure coordination across the “Whole-of-Government” for the duration of the emergency. This is the Lead Government Department for weather emergencies. Where weather emergencies are judged to impact public safety at national level the National Emergency Coordination Group (NECG) is activated by the Office of Emergency Planning on request from the Department of Housing, Local Government and Heritage. Local Authorities are the lead agencies for co-ordinating the response to severe weather emergencies. National Emergency Coordination Group (NECG) The colour coding used by Met Éireann is fully aligned with international best practice and the European Meteoalarm system ( Yellow In particular the timing and location of the occurrence of extreme weather can significantly affect the impact which extreme weather may have on society, or on the economy. Impacts from wind/rain/snow etc., vary depending on location, recent weather conditions, the state of ground, the time of year as well as the duration of the event. In general, warnings will not be issued more than 60-hours ahead of the expected adverse weather but advisories on potential hazards are issued up to a week in advance. Met Éireann’s main suite of warnings are issued by the duty forecaster between 10am and midday and are updated as necessary as new information becomes available. The service also supports the activities of the citizen and other agencies to mitigate damage to property and reduce disturbance to economic activity and so enhance support for impact-based decision making for weather events. Met Éireann is the Irish National Meteorological Service as recognised by the World Meteorological Organisation under an international convention since 1950 and one of its most important roles is to protect life and ensure citizen safety. Peer-reviewed journal articles by Met Éireann staff members Past Weather Agrometeorological Bulletins ![]()
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