20190717 14051700 1.0 TRUE srf_12hr_max_high_water_probability Depicts the probability of forecast high water over the next 12 hours using a time-lagged ensemble from the short-range forecast of the National Water Model (NWM) over the contiguous U.S. Shown are reaches that are forecast to have flow at or above high water within the next 12 hours of at least one of the last 7 forecasts. Reaches are colored by the probability that they will meet or exceed the high water threshold across the last 7 forecasts. Probabilities are derived by counting the number of forecasts that meet the high water condition within the next 12 hours, equally weighted. Also shown are USGS HUC8 polygons for basins with greater than 50% of NWM features with flow expected to be at or above high water over the next 12 hours, symbolized by the average probability. 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 short range forecast high water national water model nwm probability Short-Range 12 Hour Maximum High Water Probability Forecast National Water Model, NOAA/NWS National Water Center iVBORw0KGgoAAAANSUhEUgAAAMgAAACFCAYAAAAenrcsAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAO xAAADsQBlSsOGwAAAWxJREFUeJzt06ERACAQwDAE+6/8HB46QSLru2dmFvC03xm4DALBIBAMAsEg EAwCwSAQDALBIBAMAsEgEAwCwSAQDALBIBAMAsEgEAwCwSAQDALBIBAMAsEgEAwCwSAQDALBIBAM AsEgEAwCwSAQDALBIBAMAsEgEAwCwSAQDALBIBAMAsEgEAwCwSAQDALBIBAMAsEgEAwCwSAQDALB IBAMAsEgEAwCwSAQDALBIBAMAsEgEAwCwSAQDALBIBAMAsEgEAwCwSAQDALBIBAMAsEgEAwCwSAQ DALBIBAMAsEgEAwCwSAQDALBIBAMAsEgEAwCwSAQDALBIBAMAsEgEAwCwSAQDALBIBAMAsEgEAwC wSAQDALBIBAMAsEgEAwCwSAQDALBIBAMAsEgEAwCwSAQDALBIBAMAsEgEAwCwSAQDALBIBAMAsEg EAwCwSAQDALBIBAMAsEgEAwCwSAQDALBIBAMAsEgEAwC6+8AyxgGEVC9ixIAAAAASUVORK5CYII=