109 lines
4.5 KiB
HTML
109 lines
4.5 KiB
HTML
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<head>
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<meta content="text/html; charset=ISO-8859-1"
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http-equiv="content-type">
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<title>PlotTPCEvents</title>
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</head>
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<body>
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<h1 style="text-align: center;">PlotTPCEvents</h1>
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<div style="text-align: center;">
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<h2>Procedure to put the current tropical hazards into the Hazards grid</h2>
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March 9, 2012<br>
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<br>
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<div style="text-align: left;"><a href="#methodology">Methodology</a><br>
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<a href="#howitworks">How It Works</a><br>
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<br>
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NOTE: Due to policy changes (effective 2007 tropical season) in the TCV
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in that the TCV only covers
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coastal zones, the PlotTPCEvents now only clears and sets values in the
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Hazard grids for coastal zones. Values created by the
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forecaster in the marine zones will not be modified by the
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PlotTPCEvents procedure. No Event Tracking Numbers are set in the
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Hazards grid since ETNs for tropical events now follow WFO numbering.<br>
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<hr style="width: 100%; height: 2px;">
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<h2><a name="methodology"></a>Methodology</h2>
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</div>
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<br>
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</div>
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The PlotTPCEvents procedure is used to automatically decode the
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Tropical Prediction Center TCV product, and plot the resulting data in
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the GFE Hazard Grid.
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To run this procedure, the Hazards grid cannot be separated into
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temporary grids as done by <a href="SeparateHazards.html">SeparateHazards</a>.
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If it is separated,
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use the <a href="MergeHazards.html">MergeHazards</a>
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tool to recombine the temporary grids.<br>
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<br>
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When a TCV arrives from TPC, it is decoded internally, and a
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notification appears on all GFEs.
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<br><br>
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<img style="width: 1009px; height: 118px;" alt="TPC Notification"
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src="images/TPCNotify.png"><br>
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<br>
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Next, the forecast will select <span
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style="font-weight: bold; font-style: italic;">PlotTPCEvents</span>
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from the <span style="font-weight: bold; font-style: italic;">Hazards</span>
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menu.<br>
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<br>
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<img style="width: 259px; height: 283px;" alt="TPC Menu"
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src="images/TPCEventsMenu.png"><br>
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<br>
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The procedure then plots all active tropical watches/warnings into the
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Hazards grid.<br>
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<br>
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<img style="width: 803px; height: 696px;" alt="TPC Output Grid"
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src="images/TPCOutput.png"><br>
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<br>
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If the latest TCV cancels an existing event, you will see the event
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removed. If the latest TCV replaces a portion of an existing event, the
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watch/warning will be overwritten in the grid.<br>
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<br>
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If for some reason a cancellation VTEC code does not arrive for an
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existing tropical event, you may need to run </small></span></small></small></big></big></big></big><big
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style="color: rgb(51, 51, 255);"><big><big><big><small><small><span
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style="color: rgb(0, 0, 0);"></span></small></small></big></big></big></big><big
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style="color: rgb(51, 51, 255);"><big><big><big><small><small><small><a
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href="SeparateHazards.html">SeparateHazards</a></small></small></small></big></big></big></big>,
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<big>delete the canceled hazard then run</big> <big
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style="color: rgb(51, 51, 255);"><big><big><big><small><small><span
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style="color: rgb(0, 0, 0);"><small><a href="MergeHazards.html">MergeHazards</a>.
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<br>
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<br>
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The TCV product and the PlotTCVEvents procedure only contain coastal
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zone events. The forecaster is responsible for adding the
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appropriate marine tropical events and inland tropical events to the
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Hazards grid. PlotTCVEvents will only remove coastal zone events
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and not inland or marine events.<br>
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<br>
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</small></span></small></small></big></big></big></big>
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<hr style="width: 100%; height: 2px;">
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<h2><big><big style="color: rgb(51, 51, 255);"><a name="howitworks"></a></big></big><span
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style="font-weight: bold;"></span>How It Works</h2>
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This procedure is based on the TCV product events that have been
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captured into the <a href="VTEC.html">VTEC Decoder</a>. The
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procedure performs the following steps:<br>
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<ul>
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<li>Reads the vtec active table.</li>
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<li>Filters out all non-tropical hazards. <br>
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</li>
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<li>Filters out records from non KNHC (TPC).</li>
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<li>Creates a list of zones for each tropical phenomena and
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significance for both active events (VTEC action is NEW, CON, EXA) and
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cancelled events (VTEC action is EXP, CAN).<br>
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</li>
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</ul>
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Once the correct set of events have been determined, any existing
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tropical hazards in the Hazards grid that are found in the cancelled
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event list are removed. Then the
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calculated events are added to the Hazards grid.<br>
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<br>
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Note: The PlotTPCEvents tool only plots events that are compatible
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with the current GFE mode. If the GFE mode is operational, then
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only
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"X", "O", and "E" TCV events will be considered. If the GFE mode
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is "TEST", then only "T" TCV events will be considered.<br>
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<br>
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</body>
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</html>
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