95 lines
3.8 KiB
HTML
95 lines
3.8 KiB
HTML
<!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>PlotSPCWatches</title>
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</head>
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<body>
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<div style="text-align: center;">
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<h1>PlotSPCWatches</h1>
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<h2>Procedure for adding SPC Watches into your 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;"><br>
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<a href="#methodology">Methodology</a><br>
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<a href="#howitworks">How it works</a><br>
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</div>
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</div>
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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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<small>The PlotSPCWatches procedure is used to automatically take the
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official watch outline (WOU) product, decode the counties, watch times,
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and watch numbers, and plot this into the Hazards grid. Note: to run
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this
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procedure, the Hazards grid cannot be separated into temporary grids as
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done by <a href="SeparateHazards.html">SeparateHazards</a>. If it is
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separated, 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 WOU arrives from SPC, it is decoded internally, and a
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notification appears on all GFEs.<br>
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<br>
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<img style="width: 1019px; height: 98px;" alt="WOU Notification"
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src="images/WOU_Notify.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;">PlotSPCWatches</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: 297px; height: 266px;" alt="PlotSPC Menu"
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src="images/PlotSPCWatchesMenu.png"><br>
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<br>
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The tool then plots all active watches into the Hazards grid.<br>
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<br>
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<img style="width: 852px; height: 714px;" alt="Plotted Watches"
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src="images/PlottedWatches.png"><br>
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<br>
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If the latest WOU cancels an existing watch, you will see the watch
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removed. If the latest WOU replaces a portion of an existing watch, the
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watch will be
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overwritten in the grid. <br>
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<br>
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</small>If for some reason a cancellation VTEC code does not arrive for
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an
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existing watch, you may need to run <a href="SeparateHazards.html">SeparateHazards</a>,
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delete the canceled watch grid, then run <a href="MergeHazards.html">MergeHazards</a>
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. To create your WCN, save your Hazard grid in GFE, publish it to
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official,
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the run the Hazard_WCN formatter in <a href="FormatterLauncher.html">Formatter
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Launcher.</a><big style="color: rgb(51, 51, 255);"><big><big><big><small><small><span
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style="color: rgb(0, 0, 0);"><small><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>How
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It Works</h2>
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The PlotSPCWatches procedure analyzes the <a href="VTEC.html">VTEC
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active table</a> and filters records.<br>
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<ul>
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<li>Records currently valid (not ones from the past) from the WOU and
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WCN products are separated into those originating from SPC (with action
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codes of NEW CON EXT EXA and EXB), and those from non-SPC (all actions
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including EXP and CAN). <br>
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</li>
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<li>Records are then compared. Records are eliminated from the
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SPC list that are also in the non-SPC list. Comparisons are based
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on the Event Tracking Number, Geographical Zone, Phen and
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Sig. After this step, the SPC list should only have records
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that contain the NEW watch.</li>
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<li>Records containing EXP and CAN codes are now eliminated from the
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non-SPC list.</li>
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<li>The two data sets are combined and then overlapping watches are
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eliminated. <br>
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</li>
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<li>All existing watches are eliminated from the Hazards grid and
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then the calculated watches are added to the Hazards grid.</li>
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</ul>
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Note: The PlotSPCWatches 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 "X", "O", and "E" WOU/WCN events will be considered. If the
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GFE mode is "TEST", then only "T" WOU/WCN events will be considered.<br>
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<br>
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</body>
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</html>
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