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Hydrometeorological Prediction Center
Camp Springs, MD
What's New at the HPC
- January 29, 2008 -- Modified the area of our day 3-7 500mb height forecasts
to include the entire CONUS, and added 500mb height forecasts
to our Alaskan product suite.
- December 3, 2007 -- We have added to our product suite
Day 4-8 Forecasts for Alaska.
At this time, only fronts and mean sea level pressure
graphics, along with a written discussion, are being created. More products will be added over the next
couple of months. In addition, this function is currently experimental, therefore content may not update regularly.
- November 30, 2007 -- Recently added Model Trend Graphics
for the GFS and NAM to HPC's Model Diagnostics Page.
- June 14, 2007 -- Recently added Heat Index forecasts to
HPC's Product Suite in GIS format.
- June 5, 2007 -- Experimental Day 2 and Day 3 Excessive Rainfall
forecasts are added to our product suite.
- December 7, 2006 -- We have introduced a higher resolution version of the
Surface Analysis coded bulletin.
- September 5, 2006 -- Modified the look of the
Significant River Flood Outlook product. Categories are now color-coded and all significant water bodies
are shown in light blue.
- August 9, 2006 -- A subset of the HPC product suite is now being provided in a GIS (Geographic Information System).
This includes all QPF products, the Excessive Rainfall forecast, and the Significant River Flood Outlook.
See how to access these products in GIS format.
- June 29, 2006 -- In response to calibration studies conducted at HPC, the probability categories for the
Excessive Rainfall Forecast have been
modified. View additional regarding
these changes.
- May 8, 2006 -- We've added a Surface Analysis Archive
page where you can view individual maps dating back to March 30, 2006 or loop up to one week's worth of recent analyses.
- March 22, 2006 -- As of March 20, 2006, the page where you can download a week's worth of
Daily Weather Maps will contain downloadable daily files
for the current week. These files will usually be available around 1:00 p.m. EST each day.
- March 20, 2006 -- Moved several items from the Experimental Products
page to operational pages. These include the HPC QPF files in GRIB Format
, Day 4-7 Gridded Forecasts, and
Day 3-7 500mb Height Forecasts for the Western U.S.
- February 13, 2006 -- Modified the background of the combination
CONUS (Continental United States) analysis/Radar image.
- November 28, 2005 -- Experimental SREF derived
Winter Weather Impact Graphics.
- August 26, 2005 -- Short range forecasts and selected surface analyses are now available in
jpeg format.
- August 4, 2005 -- Created a new page which provides the capability to
convert and calculate numerous
meteorological parameters.
- March 8, 2004 -- Added to the Surface Analysis
page a combination
CONUS (Continental United States) analysis/Radar image.
- October 5, 2004 -- Changes are
made to the Excessive Rainfall graphics.
- September 15, 2004 -- Significant changes
are made to the Winter Weather product suite.
- August 31, 2004 -- The Day 4-5 and
5-day QPFs are now being produced twice per day.
- July 13, 2004 -- Added a link to
HPC's Day 4-7 Gridded Forecasts to the Experimental Products page.
- March 8, 2004 -- Upgraded the Daily Forecast Archive page
to more easily navigate through the forecast days.
- February 24, 2004 -- Added to the
Surface Analysis page the ability to view
Hourly Observations of wind chill temperature and heat index.
- January 26, 2004 -- Added to our Development and Training
page a presentation on the
Hebron Flash Flood Event of June 22-23, 2003
- January 22, 2004 -- Added a link on the
Current Products page to
Today's Forecast and to an Archive
of previous Daily Forecasts.
- December 17, 2003 --
12-hour probability of precipitation forecasts are now available for days 3-7.
- December 8, 2003 -- Added a link displaying
Medium-Range Sea-level Pressure verification to the
HPC Verification page.
- November 5, 2003 -- Added the ability to view our QPFs in
12-hour increments for days 1-3, including the capability to
loop the images.
- August 25, 2003 -- Enhanced the
HPC 3-7 Day Temperature and PoP Forecast Text File to include both maximum and mininum temperatures AND departures from normal.
Plus, have added 12-hour PoP forecasts and departures from normal.
- July 10, 2003 -- Added a link to
Day 3-7 500mb height forecasts for the Western U.S. to the
Experimental Products page.
- June 3, 2003 -- The domain of the
North American Surface Analysis is modified.
View information regarding
the changes.
- May 8, 2003 -- Modified the appearance of the
National Precipitation Verification Units' (NPVU) pages.
- May 7, 2003 -- Added a photo gallery
of the current meteorologists visiting the
International Desks.
- April 11, 2003 -- Added a page detailing the
proposed changes to the North American Surface Analysis.
- March 5, 2003 -- Upgraded the preliminary and
final day 3-7 graphics to allow for easier navigation among the
forecast days.
- February 27, 2003 -- Added a 5-panel display of the preliminary
and final day 3-7 forecasts over the continental U.S.
- February 25, 2003 -- Upgraded the
hourly surface data page to allow for easier navigation among observation times.
- February 10, 2003 -- Added buoy and ship observations to the high resolution
hourly surface data plots.
- January 29, 2003 -- Two changes were made to the site.
- Modified the Daily Weather Map page to ease navigation to online maps
and provide a link to download the weekly printed versions.
- Added the capability to loop Surface Analyses for the previous 24 hours.
- January 29, 2003 -- Modified the Daily Weather Map
page to ease navigation to maps online and provide a link to download the weekly printed versions.
- January 3, 2003 -- Added a link for the Prelimary Extended
Forecast Discussion, usually available by 1430 UTC. This discussion highlights medium-range model differences and
provides initial model preferences and/or changes to MOS for the three collaborative clusters of the National Digital
Forecast Database (NDFD).
- December 31, 2002 -- Provided new information regarding the distribution of the
Daily Weather Map.
- December 9, 2002 -- Implemented a new version of the
Model Diagnostics page. The major changes include:
- December 8, 2002 -- Added a table of black and white images
to the Surface Analysis page.
- December 3, 2002 -- Changes are coming to the way the Daily Weather Map
is printed and distributed. Click here to get the details.
- November 18, 2002 -- Added a loop of sea level pressures
and fronts for days 0-7. This product incorporates the current surface analysis (day 0) and the short and medium range forecasts (days 1-7).
This loop can be accessed from the Surface Analysis,
Days 1-2, and
Medium range (Days 3-7) pages.
- October 31, 2002 -- Added a loop of 24-hour QPF
for Days 1-3 and modified the 6-hourly loop to include Day 3.
- October 28, 2002 -- Black and white graphics added to the Surface Analysis page.
- October 22, 2002 -- Added color-filled graphics for days 3-7 minimum and maximum temperatures
and probability of precipitation forecasts.
Click here to view a sample.
- October 21, 2002 -- Numerous changes made to the web site. They include:
- October 4, 2002 -- HPC issues public advisories for
Tropical Depression Lili.
- September 30, 2002 -- Heat Index forecasts end for the warm season. They will resume on or about May 1, 2003.
- September 27, 2002 -- HPC issues public advisories for
Tropical Depression Isidore.
- September 15-16, 2002 -- HPC issues public advisories for
Tropical Depression Hanna.
- September 15, 2002 -- Winter Weather forecasts resume, with additional winter weather
links at the bottom of the page.
- September 7-11, 2002 -- HPC issues public advisories for
Tropical Depression Fay.
- August 5-9, 2002 -- HPC issues public advisories for Tropical Depression "Bertha."
- July 2, 2002 -- Reintroduced Verification Graphics for the
Eta, AVN, UKMET, and ECMWF after a long server outage.
- July 1, 2002 -- Added a page displaying Hourly Surface Observations
for the Continental United States.
- June 28, 2002 -- Created a page for Preliminary Medium-Range Graphics.
Days 3-7 sea level pressures, fronts, high and low temperatures and probability of precipitation forecasts are available by 1400 UTC.
- June 19, 2002 -- Added the presentation "Seasonal Climatology of 4-inch Rainfall Events"
by Wes Junker to the Development and Training page.
- April-May, 2002 -- HPC web pages converted to a new design, providing easier access to our suite of products.
Click here for information about the latest changes.
- April 24, 2002 -- Created new page for HPC's Medium-Range Mean Heat Index Forecasts.
Also added a link detailing HPC's accomplishments during 2001.
- February 22, 2002 -- Updated the HPC Medium-Range Forecasting presentation on the
Development and Training page.
- November 21, 2001 -- Added link to the Significant River Flood Outlook on the main HPC Homepage under Current Products.
- November 4, 2001 -- 09Z and 21Z surface analyses on the Surface Analysis page now depict analyzed fronts rather than automated isobars.
- July 6, 2001 -- Added links for 'color on white background' and 'color-fill on white background' images to the QPF page and added links for 'color on white background' images to the Surface Analysis page.
- May 29, 2001 -- Completed revision/expansion of text pages to access model bias graphics on the Model Diagnostics/Biases page.
- May 24, 2001 -- Added 'color on white background' images to Short Range Forecast page. Also added a region centered on the Gulf of Alaska to the Surface Analysis page.
- April 25, 2001 -- Completed revision/expansion of the Model Verification section of the Model Diagnostics/Biases page.
- March 19, 2001 -- Added a link to medium range products page.
Questions? Comments? Click here to send mail to the HPC.
Last Modified September 15, 2004
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