96 lines
3.9 KiB
HTML
96 lines
3.9 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>SeparateHazards Procedure</title>
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</head>
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<body>
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<h1 style="text-align: center;">SeparateHazards</h1>
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<h2 style="text-align: center;">A Procedure for Separating the Hazard
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grid into individual hazard elements</h2>
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<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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<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 SeparateHazards procedure takes each individual hazard from
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the Hazards grid, and splits it into individual temporary hazards grid.
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In complex
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situations, this allows the forecaster to modify a single hazard,
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without
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disturbing the actual Hazard grid. Once modified, the forecaster uses <a
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href="MergeHazards.html">MergeHazards</a> to composite the individual,
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temporary hazard grids back into the Hazard grid.<br>
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<br>
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In the following example, a Winter Storm Warning (WS.W) exists with a
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combined Wind Chill Advisory (WC.Y). The forecaster would like to
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extend the
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period of the Wind Chill Advisory, without affecting the Winter Storm
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Warning.<br>
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<br>
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<img style="width: 666px; height: 603px;"
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alt="Combined Hazards Separate Hazards"
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src="images/SeperateHazardsInit.png"><br>
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<br>
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First, the forecaster selects SeparateHazards from the Hazards Menu.<br>
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<br>
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<img style="width: 286px; height: 300px;" alt="Separate Hazards Menu"
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src="images/SeparateHazardsMenu.png"> <br>
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</big><br>
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<big>This tool provides no user feedback, it simply breaks the Hazard
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grid from the forecast database into it's individual elements. During
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the time that the
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forecaster has the elements separated, the Hazard grid remains locked,
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to prevent others from
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affecting the same grids.<br>
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<br>
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The temporary grids will be named in the format: <br>
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<br>
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"haz<span style="color: rgb(0, 0, 1);"><span
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style="color: rgb(255, 0, 0);">VTECWithoutDot</span><span
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style="color: rgb(0, 0, 153);">optionalETN" <span
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style="color: rgb(0, 0, 0);">(ie., hazWSW1). Notice in the example
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below, the Hazard grid has been separated into a hazWCY and hazWSW grid.<br>
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</span></span></span></big><br>
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<img style="width: 443px; height: 666px;" alt="Initial Temp Grids"
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src="images/SeparateHazardTemp1.png"><br>
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<br>
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<big>To modify only the Wind Chill Advisory, the forecast would either
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use the <a href="MakeHazard.html">MakeHazards</a> tool, or standard
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GFE editing tools like pencil, or stretching of grids to add
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or remove zones and change the start or end time of the Wind Chill
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Advisory. Notice in the example
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below, the southwest portion of the Wind Chill Advisory has been
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removed, and the advisory for the
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northeast has been extended, as evidenced by the length of the hazWCY
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grid.<br>
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<br>
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<img style="width: 444px; height: 663px;" alt="Modifed Temp Grid"
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src="images/SeparateHazardsTemp2.png"><br>
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<br>
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Finally, the forecaster runs the <a href="MergeHazards.html">MergeHazards</a>
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tool to recombine the temporary Hazard grids back into the actual
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Hazards grid. Notice that the changed Wind Chill Advisory has
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now been merged with the unchanged Winter Storm Watch.<br>
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<br>
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<img style="width: 561px; height: 510px;" alt="Recombined Hazards"
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src="images/SeparateHazardsRecombined.png"><br>
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<br>
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</big>
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<hr style="width: 100%; height: 2px;"><a name="howitworks"></a><br>
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<h2>How It Works</h2>
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The SeparateHazards procedure looks at the Hazards grids inventory and
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contents and separates each hazard into its own weather element.
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The software ensures that the grids haven't already been separated and
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then before proceeding will lock the entire Hazards weather
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element. While your Hazards grids have been separated, no
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other forecaster will be able to edit the Hazards grid.<br>
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<br>
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The weather elements created as temporary grids and cannot be saved to
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EDEX.<br>
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<br>
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<big></big>
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</body>
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</html>
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