nwm/srf_12hr_rapid_onset_flooding_probability (MapServer)

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Service Description: Depicts the probability of forecast rapid onset flooding over the next 18 hours using a time-lagged ensemble from the short-range configuration of the National Water Model (NWM) over the contiguous U.S. Shown are reaches (stream order 4 and below) that are expected to meet rapid onset flooding criteria (flow increase of 100% or greater within one hour and high water threshold conditions within 6 hours) using the most recent 7 forecasts. Reaches are colored by the probability that they will meet or exceed rapid onset conditions within hours 1-6, 7-12, and 1-12. Probabilities are computed as the % agreement across the 7 ensemble members that a given reach will meet rapid onset criteria at some point during the time period of interest. Hotspots show the average 1-12 hour rapid onset flooding probability, weighted by reach length, for USGS HUC8 basins with greater than 10% of NWM feature length meeting rapid onset criteria in the next 12 hours. High water thresholds (regionally varied) were derived using the 40-year NWM v3.0 reanalysis simulation. Updated hourly. Link to graphical web page: https://www.weather.gov/owp/operations Link to documentation: https://www.weather.gov/media/owp/operations/Public_Handbook_V2.3_%20NWC_Visualization_Services.pdf For feedback or questions please email nwps.webmaster@noaa.gov

Map Name: NWM Short-Range Rapid Onset Flooding Probability Forecast

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Description: Depicts the probability of forecast rapid onset flooding over the next 18 hours using a time-lagged ensemble from the short-range configuration of the National Water Model (NWM) over the contiguous U.S. Shown are reaches (stream order 4 and below) that are expected to meet rapid onset flooding criteria (flow increase of 100% or greater within one hour and high water threshold conditions within 6 hours) using the most recent 7 forecasts. Reaches are colored by the probability that they will meet or exceed rapid onset conditions within hours 1-6, 7-12, and 1-12. Probabilities are computed as the % agreement across the 7 ensemble members that a given reach will meet rapid onset criteria at some point during the time period of interest. Hotspots show the average 1-12 hour rapid onset flooding probability, weighted by reach length, for USGS HUC8 basins with greater than 10% of NWM feature length meeting rapid onset criteria in the next 12 hours. High water thresholds (regionally varied) were derived using the 40-year NWM v3.0 reanalysis simulation. Updated hourly. Link to graphical web page: https://www.weather.gov/owp/operations Link to documentation: https://www.weather.gov/media/owp/operations/Public_Handbook_V2.3_%20NWC_Visualization_Services.pdf For feedback or questions please email nwps.webmaster@noaa.gov

Service Item Id: ad76b0912d034226aaac81929b96e915

Copyright Text: National Water Model, NOAA/NWS National Water Center

Spatial Reference: 102100 (3857) LatestVCSWkid(0)

Single Fused Map Cache: false

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Supports Dynamic Layers: true

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MaxImageWidth: 4096

Supported Query Formats: JSON, geoJSON, PBF

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Child Resources: Info Dynamic Layer

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