Weather Prediction Center Wpc Home Page

Visualizes the probability of high rain rates that may lead to flash flooding over the next several days at over 60 major U.S. cities. Interface for specialized WPC Excessive Rainfall Outlook Maps for NWS County Warning Areas and States. Custom plots of Local Storm Reports across the Contiguous United States. Reports include rain, snow, ice, and severe weather, as well as other significant information from storm spotters. Displays the climatological significance of precipitation forecast by WPC.

The climatological significance is represented by Average Recurrence Intervals (ARIs) of precipitation estimates from NOAA Atlas-14 and Atlas2. An interactive situational awareness table that displays anomalies, percentiles, and return intervals from the GEFS, NAEFS, and ECMWF Ensembles (login required to view ECMWF data). US Dept of Commerce NOAA/NWS/NCEP Weather Prediction Center 5830 University Research Court College Park, MD 20740 Weather Prediction Center Web Team How accurate are WPC precipitation forecasts? Computing precipitation forecast accuracy 24-Hour Observed Precipitation Charts (Valid 12Z-12Z) (introduced 10/1/2008)

Latest 24-Hour Precipitation Chart (original version) [printable version] The Weather Prediction Center (WPC), located in College Park, Maryland, is one of nine service centers under the umbrella of the National Centers for Environmental Prediction (NCEP), a part of the National Weather Service... government. Until March 5, 2013, the Weather Prediction Center was known as the Hydrometeorological Prediction Center (HPC). The Weather Prediction Center serves as a center for quantitative precipitation forecasting, medium range forecasting (three to eight days), and the interpretation of numerical weather prediction computer models. The Weather Prediction Center issues storm summaries on storm systems bringing significant rainfall and snowfall to portions of the United States.

They also forecast precipitation amounts for the lower 48 United States for systems expected to impact the country over the next seven days. Advisories are also issued for tropical cyclones which have moved inland, weakened to tropical depression strength, and are no longer the responsibility of the National Hurricane Center. The Weather Prediction Center also acts as the backup office to the National Hurricane Center in the event of a complete communications failure. Long range climatological forecasts are produced by the Climate Prediction Center (CPC), a branch of the National Weather Service. These include 8–14 day outlooks, monthly outlooks, and seasonal outlooks. From the early days of organized weather collection in the United States, a central facility was used to gather and disseminate data.

Originally, this task occupied[when?] a single room within the United States Army Signal Service in Washington, D.C. Reports were collected via telegraph and general forecasts were made for the country.[citation needed][1] While WPC's roots lie deep in the past,[when?] the organization can be most directly traced to the formation of the Analysis Center by Circular Letter 39-42, signed by Weather Bureau director Francis W. Reichelderfer on March 5, 1942.[2][3] Operations began on March 16, 1942, with the unit collocated with the Weather Bureau Central Office at 24th and M Streets NW in Washington, D.C.[4] Initially the unit was... Quantitative Precipitation Forecasts (QPF) The QPF desk prepares and issues forecasts of accumulating (quantitative) precipitation, heavy rain, heavy snow, and highlights areas with the potential for flash flooding.

The basic QPF products are primarily directed to the NWS forecast offices and are available on the Internet for public use. The heavy snow forecast products, in association with the short-range public forecast products (described below), serve as a coordinating mechanism for the NWS winter storm watch and warning program. Through a continuous watch for excessive rainfall, heavy snow, and winter storms, this desk ensures that the highest quality forecast products are constantly available. The QPF desk is co-located with the National Environmental Satellite Data and Information Service (NESDIS), and together they comprise the National Precipitation Prediction Unit (NPPU). NESDIS meteorologists prepare estimates of rainfall and current trends based on satellite data, and this information is used by the QPF short term forecaster as part of the input for individual 6-hourly forecasts that... With access to WSR-88D/Doppler radar data, satellite estimates, and NCEP model forecast data as well as current weather observations and WPC analyses, the forecaster has the latest data for use in preparation of short-range...

Meteorological reasoning discussions are regularly written and issued with the forecast packages to explain and support the forecast. Mesoscale Precipitation Discussions (MPDs) include a discussion accompanied by a graphic showing areas where WPC forecasters expect conditions to occur that may cause flash flooding over the next 6 hours. This product complements the Excessive Rainfall Outlook by serving as a short term update to that product, which covers a larger time period; up to 24 hours. The MPD is more detailed and focused on a smaller area. Often, more than one MPD will be in effect at the same time covering different areas and timeframes. The MPD is produced when the forecaster identifies a risk of rainfall sufficient to produce flash flooding.

Antecedent rainfall, terrain, and the meteorological factors are taken into account in deciding when and where to issue an MPD. The MPD provides critical meteorological support to the forecast offices with life threatening flash flooding. This product is produced by the same forecaster who produces the Model Diagnostic Discussion. $( document ).ready(function() { $('.feature').hide(); $('.one-third-first').show(); $('.one-third-first img').css({ 'width': '935px' }); $('.one-third-first img').css('border', '0px'); /* vote.gov */ //$( ".div-half" ).eq(0).append( '<br><a href="https://vote.gov">Vote.gov</a>' ); /* Addition of button on top/left hand part of weather.gov is... //$( "div.five-sixth-last" ).append('**<em>Our web pages are undergoing maintenance, which may result in the display of old data. This message will be removed once maintenance is complete.</em>'); const divs = document.querySelectorAll('.full-width-first.communication-links .one-sixth-first.divs'); // If there are at least 3, insert after the third if (divs.length >= 3) { divs[2].insertAdjacentHTML('afterend', ` <div class="one-sixth-first...

High Resolution Version | Previous Days Weather Maps Animated Forecast Maps | Alaska Maps | Pacific Islands Map Ocean Maps | Legend | About These Maps Alaska | Hawaii | Guam | Puerto Rico/Virgin Islands More from the National Digital Forecast Database Short range forecast products depicting pressure patterns, circulation centers and fronts, and types and extent of precipitation. Medium range forecast products depicting pressure patterns and circulation centers and fronts

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