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A map showing day 1, day 2, and day 3 probability forecasts of Excessive Rainfall Outlook in the Continental United States |
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A map showing day 1, day 2, and day 3 probability forecasts of Excessive Rainfall Outlook in the Continental United States |
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[[-124.77321529415,24.6592398382488],[-66.7388736106279,49.5625406475338]] |
| accessInformation:
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National Oceanic and Atmospheric Administration, NOAA, National Weather Service, NWS, Weather Prediction Center, WPC |
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thumbnail/thumbnail.png |
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1.7976931348623157E308 |
| typeKeywords:
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["Data","Service","Map Service","ArcGIS Server"] |
| description:
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<div style='text-align:Left;'><div><div><p style='margin:0 0 11 0;'><span style='font-weight:bold;'><span>Precipitation Hazards Web Service</span></span><span> from the Weather Prediction Center(WPC) depicts forecasted Precipitation Hazards where there is a probable threat of Excessive Rainfall Outlook (ERO) for the next five days will exceed flash flood guidance(FFG) within 40 kilometers (25 miles) of a location. The web service’s ERO locations are displayed as polygons. These Hazards are provided by the twelve NWS River Forecast Centers (RFCs) whose service areas cover the lower 48 states. WPC uses national Flash Flood Guidance (FFG), whose 1, 3, and 6-hour values represent the amount of rainfall over those short durations which it is estimated would bring rivers and streams up to bankfull conditions. The primary Precipitation hazard is Flash Flooding and WPC provides guidance with the warnings’ use estimates to build these polygons that contain the likelihood that FFG will be exceeded by assessing environmental conditions (e.g. moisture content and steering winds), recognizing weather patterns commonly associated with heavy rainfall, and using a variety of deterministic and ensemble-based numerical model tools that get at both the meteorological and hydrologic factors associated with flash flooding. These Hazard ERO polygons are produced by a highly collaborative product and benefits from the input of meteorologists and hydrologists among the Weather Forecasted Offices, RFCs, and National Water Center. The EROs polygon are rendered based on Excessive Rainfall Risk Categories.</span></p><br /> <p style='margin:0 0 11 0;'><span style='font-weight:bold;'>Update Frequency:</span><span> Day 1 Excessive Rainfall - 0100Z, 0830Z, and 1500Z. For Day 1, forecasters can issue updates at any time, but these 3 times are required each day. Day 2 and 3 Excessive Rainfall - 0830Z and 2030Z. </span></p><br /><p style='font-weight:bold;'><span><span>ERO Categories are as follows:</span></span></p><p><span style='font-weight:bold;'><span>No Area /Label </span></span><span style='font-style:italic;font-weight:bold;'><span>[Probability Less than 5% Chance of Flash Flood]</span></span><span><span> - Flash floods are generally not expected</span></span></p><p><span style='font-weight:bold;'><span>Marginal (MRGL)</span></span><span><span> </span></span><span style='font-style:italic;font-weight:bold;'><span>– [At least 5% Chance of Flash Flooding]-</span></span><span><span>Possible Isolated flash flood -Localized and primarily affecting places that can experience rapid runoff with heavy rainfall.</span></span></p><p><span style='font-weight:bold;'><span>Slight (SLGT) </span></span><span style='font-style:italic;font-weight:bold;'><span>[At least 15% Chance of Flash Flooding]-</span></span><span><span> Possible Scattered flash floods that are mainly localized. The most vulnerable are people in urban areas, roads small streams, and washes. Isolates significant flash floods are possible.</span></span></p><p><span style='font-weight:bold;'><span>Moderate (MDT) [At least 40%</span></span><span style='font-style:italic;font-weight:bold;'><span> Chance of Flash Flooding]-</span></span><span><span> </span></span><span><span> </span></span><span><span>Numerous flash floods are likely- Numerous flash flooding events with significant events are possible. Many streams may flood potentially affecting large rivers.</span></span></p><p><span style='font-weight:bold;'><span>High (High)</span></span><span><span> </span></span><span style='font-style:italic;font-weight:bold;'><span>[At least 70% Chance of Flash Flooding] </span></span><span><span>-</span></span><span><span> Widespread flash floods are expected Conditions include severe widespread flash flooding. Areas that do not normally experience flash flooding have conditions where lives and property are in greater danger.</span></span></p><p><p style='margin:7 0 7 0;'><span>Link to graphical web page: </span><a href='https://www.wpc.ncep.noaa.gov/qpf/excessive_rainfall_outlook_ero.php' target='_blank' style='text-decoration:underline;'><span style='text-decoration:underline;'><span>https://www.wpc.ncep.noaa.gov/qpf/excessive_rainfall_outlook_ero.php</span></span></a></p><p><p style='margin:7 0 7 0;'><span><span>Link to data download (shp): </span></span><a href='https://www.wpc.ncep.noaa.gov/qpf/excessive_rainfall_outlook_ero.php' target='_blank' style='text-decoration:underline;'><span style='text-decoration:underline;'><span>https://www.wpc.ncep.noaa.gov/qpf/excessive_rainfall_outlook_ero.php</span></span></a></p><p><p style='margin:7 0 7 0;'><span><span>Link to </span></span><a href='https://www.weather.gov/gis/IDP-GISRestMetadata' target='_blank' style='text-decoration:underline;'><span style='text-decoration:underline;'><span>metadata</span></span></a></p><br />
<p style='font-size:12pt'><span style='font-weight:bold;'>Questions/Concerns: </span><span> about the service, please contact the </span><a href='mailto:nws.mapservices@noaa.gov/' style='text-decoration:underline;'><span>DISS GIS </span></a><span>team</span></p><p style='font-size:12pt'><span style='font-weight:bold;'>Time Information:</span><span> This service is not time enabled.</span></p>
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| title:
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wpc_precip_hazards |
| type:
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Map Service |
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| tags:
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["Excessive Rainfall","Flash Flooding"] |
| culture:
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en-US |
| name:
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wpc_precip_hazards |
| guid:
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08BBAB15-950A-41F0-9ADF-74B68EEAF0F9 |
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0 |
| spatialReference:
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WGS_1984_Web_Mercator_Auxiliary_Sphere |