182 lines
5.7 KiB
HTML
182 lines
5.7 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>ViewWCL Procedure</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>ViewWCL</h1>
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<h2>Procedure for viewing the SPC proposed watches</h2>
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<big style="color: rgb(51, 51, 255);"><big><big><big><small
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style="font-weight: bold;"><span style="color: rgb(0, 0, 0);"></span></small></big></big></big></big></div>
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<big style="color: rgb(51, 51, 255);"><big><big><big><small
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style="font-weight: bold;"><span style="color: rgb(0, 0, 0);"></span></small></big></big></big></big><a
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href="#methodology">Methodology</a><br>
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<a href="#howitworks">How It Works</a><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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<br>
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<big>The first step in the watch by county process occurs when the
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Storm Prediction Center issued a Watch Coordination List (WCL) product.
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This product
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outlines their first guess at what the watch should be, and is used a
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reference
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for the watch coordination conference call.<br>
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<br>
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In GFE, the display of WCL information is handled in a two step process.<br>
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<br>
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First, the WCL arrives internally, triggering a notification on all
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GFEs.<br>
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<br>
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<img alt="WCL Notification" src="images/WCLNotify.png"><br>
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<br>
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At that point, the forecast should select <span
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style="font-weight: bold; font-style: italic;">ViewWCL</span> from the
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<span style="font-weight: bold; font-style: italic;">Hazards
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Menu. </span><span style="font-weight: bold;"><span
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style="font-weight: bold;"><br>
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<br>
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<br>
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</span></span><span style="font-weight: bold; font-style: italic;"><br>
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<img style="width: 289px; height: 253px;" alt="View WCL Menu"
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src="images/ViewWCLMenu.png"><br>
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<br>
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<br>
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</span>A dialog is displayed and the forecaster selects the appropriate
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bulletin. The dialog lists all of the WLCs received in the last six
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hours.<br>
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<br>
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<img alt="" src="images/ViewWCLChoice.png"><br>
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<br>
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When the procedure runs, it will create a temporary grid in GFE
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called <span style="font-weight: bold; font-style: italic;">ProposedWatches</span>.
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This grid has no bearing whatsoever on the actual Hazard grid, as it is
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for display and coordination only.<br>
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<br>
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<img style="width: 676px; height: 564px;" alt="WCL Grid"
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src="images/WCLGrid.png"><br>
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<br>
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<span style="font-weight: bold;">The grid has eight labels. These are:</span><br>
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</big>
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<table style="width: 70%; text-align: left;" border="2" cellpadding="2"
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cellspacing="2">
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<tbody>
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<tr>
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<td>Key<br>
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</td>
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<td>Current Watch Type<br>
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</td>
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<td>Proposed Watch Type<br>
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</td>
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</tr>
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<tr>
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<td><span style="color: rgb(204, 0, 0);">SV.A</span><br>
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</td>
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<td>None<br>
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</td>
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<td>Severe Thunderstorm Watch<br>
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</td>
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</tr>
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<tr>
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<td><span style="color: rgb(204, 0, 0);">TO.A</span><br>
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</td>
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<td>None<br>
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</td>
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<td>Tornado Watch<br>
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</td>
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</tr>
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<tr>
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<td><span style="color: rgb(204, 0, 0);">sv.a</span><br>
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</td>
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<td>Severe Thunderstorm Watch<br>
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</td>
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<td>No Change<br>
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</td>
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</tr>
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<tr>
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<td><span style="color: rgb(204, 0, 0);">to.a</span><br>
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</td>
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<td>Tornado Watch<br>
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</td>
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<td>No Change<br>
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</td>
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</tr>
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<tr>
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<td><span style="color: rgb(204, 0, 0);">to->SV</span><br>
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</td>
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<td>Tornado Watch<br>
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</td>
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<td>Severe Thunderstorm Watch<br>
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</td>
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</tr>
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<tr>
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<td><span style="color: rgb(204, 0, 0);">sv->SV</span><br>
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</td>
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<td>Severe Thunderstorm Watch<br>
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</td>
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<td>Severe Thunderstorm Watch (New)<br>
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</td>
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</tr>
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<tr>
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<td><span style="color: rgb(204, 0, 0);">sv->TO</span><br>
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</td>
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<td>Severe Thunderstorm Watch<br>
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</td>
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<td>Tornado Watch<br>
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</td>
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</tr>
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<tr>
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<td><span style="color: rgb(204, 0, 0);">to->TO</span><br>
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</td>
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<td>Tornado Watch<br>
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</td>
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<td>Tornado Watch (New)<br>
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</td>
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</tr>
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</tbody>
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</table>
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<br>
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<big>Here is an example of a WCL grid with two watches displayed. The
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brighter blue
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region is the new (proposed) Severe Thunderstorm Watch. The darker red
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area to
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the southeast is an existing Tornado Watch. The purple area between
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them are counties
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which are currently under the Tornado Watch, but will be under the
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Severe Thunderstorm
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Watch when it is issued.<br>
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<br>
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<img style="width: 507px; height: 483px;" alt="WCL Grid 2"
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src="images/WCLGrid2.png"><br>
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<br>
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</big>
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<hr style="width: 100%; height: 2px;">
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<h2><a name="howitworks"></a>How It Works</h2>
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The ViewWCL procedure reads in saved data written into the EDEX
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databases by the <a href="VTEC.html">VTEC Decoder</a>. The data
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contains the watch type, the ugc list of counties, the WCL issuance
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time, and the WCL expiration time. The procedure then filters the
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VTEC active table and extracts records that meet all of the following
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conditions:<br>
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<ul>
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<li>Product PIL is "WCN"</li>
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<li>Office ID is your own office id</li>
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<li>Event ending time is later than the current time</li>
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<li>The VTEC action code is not CAN or EXP.</li>
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</ul>
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The final steps are:<br>
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<ul>
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<li>The procedure calculates the starting and ending time of the
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"to-be-created" grid by encompassing all events that were filtered,
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plus the issuance and expiration time.<br>
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</li>
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<li>Any existing ProposedWatches grids are removed from the GFE.</li>
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<li>Comparisons are made between the proposed WCL watch and the
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active table information to determine the correct "category" for
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display.</li>
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<li>The temporary ProposedWatches grid is created and displayed.</li>
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</ul>
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</body>
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</html>
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