![]() Non-Telemeterd: Advised to force evacuation Non-Telemeterd: Intense to Torrential Rainfall Non-Telemetered: Flood is persisting force evacuation is recommended Telemetered: Water level is continuously rising above critical level Non-Telemeterd: Advised to take appropriate action Non-Telemeterd: Heavy to Intense Rainfall Non-Telemetered: Flood is occurring immediate action is recommended Telemetered: Water level is above critical level Non-Telemeterd: Advised to be alert for possible flood, flash flood and landslides Non-Telemeterd: Moderate to Heavy Rainfall Non-Telemetered: Alert for possible flash floods and landslides Telemetered: Water level is continuously rising but still below critical level Non-Telemetrd: Advised to take Precautionary Measures Non-Telemeterd: Light to Moderate Rainfall Non-Telemetered: Monitor for possible flooding area Telemetered: Slow rise in water level but still below alarm level Flood Warnings issued by the PAGASA Warning name In the Philippines, the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) branch of the Department of Science and Technology (DOST) issues general flood advisory (for non-telemetered river basins whenever there is a significant amount of rainfall recorded). The type of flood warning service available varies greatly from country to country, and a location may receive warnings from more than one service. diversion of messages to alternates where no acknowledgement received.tracking of alert messages and acknowledgements received.The need to avoid situations where a warning condition is rescinded only for the warning to be re-issued within a short time, again because of the wasted efforts of the general public and because such occurrences would bring the flood warning service into disrepute.Ī computer system for flood warning will usually contain sub-systems for:.The need to avoid issuing warnings unnecessarily, because of the wasted efforts of those who respond and because a record of false alarms means that fewer would respond to future warnings.The delay between a warning being initiated and it being received by the public.The amount of time that the public would need to respond effectively to a warning.The reliability of the available forecasts and how this changes with lead-time.The decisions made by someone responsible for initiating flood warnings must be influenced by a number of factors, which include: decisions to issue flood warnings to the general public.decisions to escalate or change the state of alertness internal to the flood warning service provider, where this may sometimes include partner organisations involved in emergency response.The task of providing warning for floods is divided into two parts: ![]() The distinction between the two is that the outcome of flood forecasting is a set of forecast time-profiles of channel flows or river levels at various locations, while "flood warning" is the task of making use of these forecasts to make decisions about whether warnings of floods should be issued to the general public or whether previous warnings should be rescinded or retracted. ( December 2019)Ī flood warning is closely linked to the task of flood forecasting. Consider transferring direct quotations to Wikiquote or, for entire works, to Wikisource. ![]() Please help improve the article by presenting facts as a neutrally worded summary with appropriate citations. This article contains too many or overly lengthy quotations for an encyclopedic entry.
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