In Hong Kong the typhoon signal system consists of 8 signals in 5 levels numbered non-consecutively for historical reasons. Red means you should take action now to keep yourself and others safe from the impact of the weather. Any of the seven weather types can form a dual warning in a number of combinations. It is important to read the content of yellow warnings to determine which weather situation is being covered by the warning. Hazard CAP Categories of Severity; Minor (Alert level 1, WHITE) Moderate (Alert level 2, YELLOW) Severe (Alert level 3, ORANGE) Extreme (Alert level 3, RED) ; Heavy Rain and Flood: 50 mm in 1hrs or 80 mm in 6 hours: 70 mm in 1hrs or 100 mm in 6 hours Shenzhen and Zhuhai used digitally arranged typhoon signals from June 4, 1994 to November 1, 2000,[22] but they have now been replaced by typhoon warning signals. These warnings are given a colour (yellow, amber or red) depending on a combination of both the impact the weather may have and the likelihood of those impacts occurring. [7] These watches are upgraded to tropical storm warnings, when gale and storm force winds become expected to occur somewhere in the warning area within 36 hours. Indicating that a tropical storm or typhoon warning enters the South China Sea, its route is moving in the direction of the Pearl River Estuary. PARTIAL DROUGHT: A partial drought is a period of at least 29 consecutive days, the mean daily rainfall of which does not exceed 0.2 mm. [31], The Fiji Meteorological Service (FMS) issues a tropical cyclone alert for the Cook Islands, Fiji, Kiribati, Nauru, Niue, Tokelau and Tuvalu, when a tropical cyclone has a significant probability of causing gale-force winds or stronger winds within 24–48 hours. additional information about the forecast weather, the list of areas and local authorities affected.
[8] The warning is issued just prior to when the strongest winds of the eyewall are expected to impact an area. [23] The sign is roughly the same as the typhoon signal used in Shenzhen and Zhuhai.[24]. The tabs at the top of the page allow you to navigate through the next seven days, with warning triangles highlighting any weather warnings affecting the UK on each day. [7] Hurricane watches are issued when sustained winds of 64 knots (74 mph; 119 km/h) are possible, within 48 hours in a specified area in association with a tropical, subtropical or post-tropical cyclone. A storm is named by a National Meteorological Service when Orange Level wind warnings are forecast to impact over a wide area overland. To see the full details for each warning, click on the chosen warning label on the map. In the Northern hemisphere, meteorological summer is taken as the three warmest months which are June, July and August. our privacy statement. For best viewing experience of this website, please enable JavaScript. The blight forecasting method used in Ireland is based on the Bourke Rules, summarised as follows: If 10 to >12 or more Effective Blight Hours are expected a BLIGHT WARNING is issued. [7] These watches are upgraded to hurricane warnings, when hurricane-force winds become expected to occur somewhere in the warning area within 36 hours. Strong wind with a sustained speed of 41–62 km/h, sustained speed of 63–117 km/h from the northwest, southwest, northeast, southeast quadrants respectively. Hurricane Force Warnings are issued if winds of greater than 64 knots are expected. They continue as long as conditions of T>10°C and RH>90% exist. Tropical cyclones will be within 24 hours or are affecting the area, with an average wind level of strong winds (6-7) (41-62 km/h). A guide to the National Severe Weather Warning Service. [26][27] Each signal has a day signal and a night signal for hoisting, which are still hoisted in Macau but no longer hoisted in Hong Kong.

No weather warnings are in force for the UK. It is very likely that there will be a risk to life, with substantial disruption to travel, energy supplies and possibly widespread damage to property and infrastructure.

[10] The extreme wind warning is now expected to be used in these situations.

It is important to read the content of yellow warnings to determine which weather situation is being covered by the yellow warning.

Widespread thunderstorms/severe lightning, Dense fog/freezing fog persisting over a wide area, Widespread mean speeds in excess of 80km/h, Violent Storm Force 11 / Hurricane force 12, Air minima minus 10C (or below) for three consecutive, As Orange criterion, but persisting for five or more, A time for suitable spraying conditions prior to the blight spell should be indicated (ideally 48 hours ahead). Check your activity/event and delay or cancel as appropriate. BBC Weather in association with MeteoGroup. The Met Office issues warnings for rain, thunderstorms, wind, snow, lightning, ice and fog. The location of landfall is discussed at this stage. The scale tops off with a red alert, the maximum level of danger. Amber Warning: There is an increased likelihood of impacts from severe weather, which could potentially disrupt your plans. They are notices to the local population and civil authorities to make appropriate preparation for the cyclone, including evacuation of vulnerable areas where necessary. Warnings are issued 24 hours prior to the tropical cyclone making landfall. [9] The warning is to be issued for the smallest area possible, and be valid for times of two hours or less. If you click on the warnings banner you will be taken to the weather warnings page. 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. Follow instructions and advice given by the authorities under all circumstances and be prepared for exceptional measures. The Met Office issues weather warnings, through the National Severe Weather Warning Service, when severe weather has the potential to bring impacts to the UK. Latest weather conditions and forecasts for the UK and the world. We're working to make this site accessible for all. A definite warning that a tropical cyclone is expected to come near enough to Hong Kong to cause strong winds in Hong Kong. These impacts can include damage to property, travel delays and cancellations, loss of water supplies, power cuts and, in the most severe cases, bring a danger to life. Or confir- mation of Indian ocean wide Tsunami of moder- ate impact to Maldives, Confirmation of Indian ocean wide Tsunami of high impact to Maldives, Confirmation of Indian ocean wide Tsunami of extreme impact to Maldives. In particular it is hoped that this all-Ireland warnings display will promote citizen and societal safety in border regions. Yellow Warning: Yellow warnings can be issued for a range of weather situations. There is an increased likelihood of impacts from severe weather, which could potentially disrupt your plans. The criteria for the different warnings levels (Yellow, Orange, Red) and the different weather elements are laid out in the tables below. Support your business with world-leading science and technology. Yellow and Amber warnings represent a range of impact levels and likelihoods. (Standby) A tropical cyclone is centred within 800 km of the territory. The average wind power on the coast or land is above 12, or the gust above 14 and may continue. We sometimes categorize certain weather events as "Red Alert" or "Yellow Alert" days to signify the potential for severe weather. This is the Lead Government Department for weather emergencies. [9] It was developed in response to confusion resulting from the landfall of Hurricane Katrina. Or mag>8 in Indian Ocean within 4000km of Maldives EEZ, Magnitude > 8 within 400km of Maldives EEZ. You will also find additional links to stay up to date with the warnings through our mobile apps, social media or email alerts.

TCWS #5 - Tropical cyclone winds greater than 220 km/h are prevailing or expected within 12 hours. 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. Infrequent and dangerous weather conditions which may pose a threat to life and property. The Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) releases tropical cyclone warnings in the form of Tropical Cyclone Wind Signals (or just storm signals). 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.
Stage 2: Cyclone alert - Issued 48 hours in advance of the commencement of adverse weather over the coastal areas. Verification, impacts and post-processing, Climate information for international development, Science for Impacts, Resilience and Adaptation (SIRA), Atmospheric processes and parametrizations, Regional model evaluation and development, Environmental Hazard and Resilience Services. [32] The National Meteorological and Hydrological Services of the Solomon Islands, Samoa, Indonesia, Papua New Guinea, Tonga, New Zealand, Vanuatu, Timor Leste and American Samoa are responsible for their own watches and warnings.[32]. 4 different symbols for different directions. The latest breakthroughs, research and news from the Met Office. Tropical cyclone warnings and watches are alerts issued by national weather forecasting bodies to coastal areas threatened by the imminent approach of a tropical cyclone of tropical storm or hurricane intensity. Be aware about meteorological conditions and check if you are exposed to danger by nature of your activity or your specific location. These watches would be upgraded to storm surge warnings when there is a danger of life-threatening storm surge occurring within 36 hours. Blight Warnings issued during the first two weeks of May should include the specification ‘for early sown crops’. Widespread damage, travel and power disruption and risk to life is likely. This means there is the possibility of travel delays, road and rail closures, power cuts and the potential risk to life and property. If you click through to your location, the table will show a warnings bar across the times that the warning is in force. The timing and location of the occurrence of extreme weather can significantly affect the impact which it may have on society, or on the economy. Implication for citizens: usually no need to go to school or work for most people if hosted before a certain hours before official work hours; depends on official announcement & employment contracts. Gale warnings are issued by Met Éireann for Irish coastal waters, which are regarded as extending 30 miles out from the coastline, and the Irish Sea or part thereof. National Meteorological Library & Archive, Headline – a short weather headline, which states what weather type, is forecast, What to expect – details on the types of impact forecast and an indication of how likely those impacts are, What should I do – this section links to advice and guidance from our partners on how to stay safe in severe weather. Each warning will contain the following sections: When applicable, warnings will include information on why a warning has been updated.


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