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National Weather Service
Report - listing of Operational Products in database, sorted by Newest First.
Product Name Brief Description Operational Date
Tropical Weather Outlook (TWO) This is 2014 update to to the existing operational PDD. PDD updated to include the extended (5 Day) Tropical weather Outlook. NHC and CPHC will now provide the genesis probabilities in a semi tabular form following the discussion. The TWO will be issued in mixed case mode on an experimental basis for the 2014 season. For details see The TWO is a text product prepared by the National Hurricane Center and Central Pacific Hurricane Center for their respective areas of responsibility. It is a general assessment of activity in the tropics, pertaining to tropical cyclone formation by providing possible areas where tropical cyclones could development. 2003-06-20 
Tropical Weather Summary (TWS) PDD updated for the following: Effective with the 2009 season, the product changes from a narrative to a mainly tabular format. The TWS is a monthly alphanumeric product issued by the National Hurricane Center (NHC) and the Central Pacific Hurricane Center (CPHC) to summarize tropical cyclone activity for the previous month. NHC issues summaries for tropical cyclone activity over the Atlantic and eastern north Pacific (north of the equator and east of 140W longitude) basins. CPHC issues summaries for tropical cyclone activity over the central North Pacific (north of the equator between 140W and 180W longitude) basin. The centers issue new summaries the first day of each month from June through December. The last TWS of the tropical cyclone season (December issuance) covers activity for the entire season from June through the end of November. Effective with the 2009 season, the product changes from a narrative to a mainly tabular format. 2003-06-20 
Tropical Cyclone Danger Area The Tropical Cyclone Danger Area is a graphical marine product depicting a tropical cyclone's track (out to 72 hours) and shades in a danger area determined by adding 100, 200, and 300 nautical miles plus the 34 knot wind radii to the 24-, 48-, and 72- hour forecast position respectively in the Atlantic and east Pacific. For the central Pacific the shaded danger area will varying in width dependent upon the hurricane specialists confidence in the track and the length of the 34 knot wind radii. In addition, areas of possible tropical cyclone genesis (out to 36 hours) are included and depicted as either a circular, rectangle, oval, or polygon shaped area. The product is prepared by the TPC and covers the entire Atlantic north of the equator and the Pacific north of the equator from the Mexican and Central America coast west to 140 west. CPHC prepares a separate chart for 140 west to the International Dateline north of the equator. 2003-06-20 
Tropical Cyclone Discussion (TCD) The TCD is a text product prepared by the National Hurricane Center (NHC) and Central Pacific Hurricane Center (CPHC) for tropical cyclones in their respective basin of responsibility. The TCD provides forecasters' reasoning behind the analysis and forecast of a tropical cyclone. Discussions include prognostic reasoning; objective techniques employed; NHC, CPHC, and Hydrometeorological Prediction Center guidance used; coordinated 12-, 24-, 36-, 48-, 72-, 96-, and 120-hour tropical cyclone forecast positions and maximum sustained wind speed forecasts; other meteorological decisions; and plans for watches and warnings. This product is also issued for subtropical storms. 2003-06-20 
Flash Flood Potential Index The Flash Flood Potential Index (FFPI) is a text product produced by forecasters at the WFO SGX and WFO LOX using objective forecasts techniques based upon model data. Ratings of flash flood potential (numbers 0 through 4) for the next two days (today and tomorrow or tomorrow and the next day - depending on the issuance time) are calculated using precipitable water, winds aloft (700 mb), and forecaster knowledge of other atmospheric factors such as stability and atmospheric capping. The FFPI is issued during flash flood season from June 1st through September 30th. 2003-06-20 
Great Lakes Break-up Outlook Product Issued in March. Provides guidance on when any ice remaining on the Great Lakes will dissipate. 2003-06-11 
High Surf Advisory Provides notification of potentially life threatening surf conditions 2003-06-11 
High Seas Forecast Describes potentially hazardous weather across large areas of the open ocean. 2003-06-11 
Cook Inlet Sea Ice Analysis Aids ships navigating the ice-covered waters of Cook Inlet and into the Port of Anchorage 2003-06-11 
Sea Ice Analysis Sea ice conditions for the waters surrounding Alaska 2003-06-11 
Atlantic and Pacific High Wind and Associated Seas Depicts areas of strong winds and associated seas over large parts of the Atlantic and Pacific. Issued outside the hurricane season. 2003-06-11 
Sea Ice Advisory Provides analysis, forecast, and climatological information pertaining to sea ice in the waters surrounding Alaska. 2003-06-11 

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