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- Flash_flood_guidance_system abstract "The flash flood guidance system (FFGS) was designed and developed by the Hydrologic Research Center a non-profit public-benefit corporation located in of San Diego, CA, US, for use by meteorological and hydrologic forecasters throughout the world. The primary purpose of the FFGS is to provide operational forecasters and disaster management agencies with real-time informational guidance products pertaining to the threat of small-scale flash flooding throughout a specified region (e.g., country or portion of a country, several countries combined). The FFGS provides the necessary products to support the development of warnings for flash floods from rainfall events through the use of remote-sensed precipitation (e.g., radar and satellite-based rainfall estimates) and hydrologic models.The FFGS outputs are made available to users to support their analysis of weather-related events that can initiate flash floods (e.g., heavy rainfall, rainfall on saturated soils) and then to make a rapid evaluation of the potential for a flash flood at a location. To assess the threat of a local flash flood, the FFGS is designed to allow product adjustments based on the forecaster’s experience with local conditions, incorporation of other information (e.g., numerical weather prediction output) and any last minute local observations (e.g., non-traditional rain gauge data) or local observer reports. The system supports evaluations of the threat of flash flooding over hourly to six-hourly time scales for stream basins that range in size from 25 to 200 km2 in size.Important technical elements of the flash flood guidance system are the development and use of a bias-corrected radar and/or satellite precipitation estimate field and the use of land-surface hydrologic modeling. The system then provides information on rainfall and hydrologic response, the two important factors in determining the potential for a flash flood. The system is based on the concept of flash flood guidance and flash flood threat. Both indices provide the user with the information needed to evaluate the potential for a flash flood, including assessing the uncertainty associated with the data.Flash Flood Guidance is the amount of rainfall of a given duration over a small stream basin needed to create minor flooding (bankfull) conditions at the outlet of the stream basin. For flash flood occurrence, durations up to six hours are evaluated and the stream basin areas are of such a size to allow reasonably accurate precipitation estimates from remotely sensed data and in-situ data. Flash flood guidance then is an index that indicates how much rainfall is needed to overcome soil and channel storage capacities and to cause minimal flooding in a basin.Flash Flood Threat is the amount of rainfall of a given duration in excess of the corresponding Flash Flood Guidance value. The flash flood threat when used with existing or forecast rainfall then is an index that provides an indication of areas where flooding is imminent or occurring and where immediate action is or will be shortly needed.↑ ↑ 2.0 2.1 ↑ 3.0 3.1 3.2 ↑ 4.0 4.1 4.2 4.3 4.4 ↑ ↑ 6.0 6.1 ↑".
- Flash_flood_guidance_system thumbnail FFG_schematic.png?width=300.
- Flash_flood_guidance_system wikiPageExternalLink index.php.
- Flash_flood_guidance_system wikiPageExternalLink index.php.
- Flash_flood_guidance_system wikiPageID "40465745".
- Flash_flood_guidance_system wikiPageLength "15654".
- Flash_flood_guidance_system wikiPageOutDegree "17".
- Flash_flood_guidance_system wikiPageRevisionID "660031389".
- Flash_flood_guidance_system wikiPageWikiLink Category:Early_warning_systems.
- Flash_flood_guidance_system wikiPageWikiLink Category:Emergency_management.
- Flash_flood_guidance_system wikiPageWikiLink Category:Flood_control.
- Flash_flood_guidance_system wikiPageWikiLink Category:Flood_control_projects.
- Flash_flood_guidance_system wikiPageWikiLink Category:Floods.
- Flash_flood_guidance_system wikiPageWikiLink Category:Hydrology.
- Flash_flood_guidance_system wikiPageWikiLink Flash_flood.
- Flash_flood_guidance_system wikiPageWikiLink Flash_flood_warning.
- Flash_flood_guidance_system wikiPageWikiLink Flash_flood_watch.
- Flash_flood_guidance_system wikiPageWikiLink Hydrologic_Research_Center.
- Flash_flood_guidance_system wikiPageWikiLink Hydrologic_Research_Center_(US).
- Flash_flood_guidance_system wikiPageWikiLink Hydrology.
- Flash_flood_guidance_system wikiPageWikiLink Meteorology.
- Flash_flood_guidance_system wikiPageWikiLink Public-benefit_corporation.
- Flash_flood_guidance_system wikiPageWikiLink File:BSME_interface.png.
- Flash_flood_guidance_system wikiPageWikiLink File:FFG_schematic.png.
- Flash_flood_guidance_system wikiPageWikiLink File:FFG_system_interface_snow_products.png.
- Flash_flood_guidance_system wikiPageWikiLinkText "Flash flood guidance system".
- Flash_flood_guidance_system hasPhotoCollection Flash_flood_guidance_system.
- Flash_flood_guidance_system wikiPageUsesTemplate Template:Lead_too_long.
- Flash_flood_guidance_system wikiPageUsesTemplate Template:Reflist.
- Flash_flood_guidance_system subject Category:Early_warning_systems.
- Flash_flood_guidance_system subject Category:Emergency_management.
- Flash_flood_guidance_system subject Category:Flood_control.
- Flash_flood_guidance_system subject Category:Flood_control_projects.
- Flash_flood_guidance_system subject Category:Floods.
- Flash_flood_guidance_system subject Category:Hydrology.
- Flash_flood_guidance_system comment "The flash flood guidance system (FFGS) was designed and developed by the Hydrologic Research Center a non-profit public-benefit corporation located in of San Diego, CA, US, for use by meteorological and hydrologic forecasters throughout the world.".
- Flash_flood_guidance_system label "Flash flood guidance system".
- Flash_flood_guidance_system sameAs m.010qmw7y.
- Flash_flood_guidance_system sameAs Q17076068.
- Flash_flood_guidance_system sameAs Q17076068.
- Flash_flood_guidance_system wasDerivedFrom Flash_flood_guidance_system?oldid=660031389.
- Flash_flood_guidance_system depiction FFG_schematic.png.
- Flash_flood_guidance_system isPrimaryTopicOf Flash_flood_guidance_system.