20190715 16541200 1.0 TRUE srf_18hr_rapid_onset_flooding Depicts forecast rapid onset flooding using the short-range configuration of the National Water Model (NWM) over the contiguous U.S. Shown are reaches (stream order 4 and below) with a forecast flow increase of 100% or greater within an hour, and which are expected to be at or above the high water threshold within 6 hours of that increase. Also shown are USGS HUC10 polygons symbolized by the percentage of NWM waterway length (within each HUC10) that is expected to meet the previously mentioned criteria. 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 rapid onset flooding national water model nwm srf short range conus Short-Range 18 Hour Rapid Onset Flooding Forecast National Water Model, NOAA/NWS National Water Center iVBORw0KGgoAAAANSUhEUgAAAMgAAACFCAYAAAAenrcsAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAO xAAADsQBlSsOGwAAAWxJREFUeJzt06ERACAQwDAE+6/8HB46QSLru2dmFvC03xm4DALBIBAMAsEg EAwCwSAQDALBIBAMAsEgEAwCwSAQDALBIBAMAsEgEAwCwSAQDALBIBAMAsEgEAwCwSAQDALBIBAM AsEgEAwCwSAQDALBIBAMAsEgEAwCwSAQDALBIBAMAsEgEAwCwSAQDALBIBAMAsEgEAwCwSAQDALB IBAMAsEgEAwCwSAQDALBIBAMAsEgEAwCwSAQDALBIBAMAsEgEAwCwSAQDALBIBAMAsEgEAwCwSAQ DALBIBAMAsEgEAwCwSAQDALBIBAMAsEgEAwCwSAQDALBIBAMAsEgEAwCwSAQDALBIBAMAsEgEAwC wSAQDALBIBAMAsEgEAwCwSAQDALBIBAMAsEgEAwCwSAQDALBIBAMAsEgEAwCwSAQDALBIBAMAsEg EAwCwSAQDALBIBAMAsEgEAwCwSAQDALBIBAMAsEgEAwC6+8AyxgGEVC9ixIAAAAASUVORK5CYII=