142 lines
5.9 KiB
HTML
142 lines
5.9 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<html>
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<head>
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<meta http-equiv="CONTENT-TYPE" content="text/html; charset=utf-8">
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<title>CheckTandTd</title>
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<meta name="GENERATOR" content="OpenOffice.org 1.1.3 (Linux)">
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<meta name="CREATED" content="19951121;16410000">
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<meta name="CHANGED" content="20050706;13040400">
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<style>
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<!--
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@page { size: 8.5in 11in; margin-right: 1.25in; margin-top: 1in; margin-bottom: 1in }
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P { margin-bottom: 0.08in; direction: ltr; color: #000000; text-align: left; widows: 0; orphans: 0 }
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P.western { font-family: "Bitstream Vera Serif", "Times New Roman", serif; font-size: 12pt; so-language: en-US }
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P.cjk { font-family: "Bitstream Vera Sans"; font-size: 12pt; so-language: }
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P.ctl { font-family: "Lucidasans"; font-size: 12pt; so-language: }
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-->
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</style>
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</head>
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<body dir="ltr" lang="de-DE" text="#000000">
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<font face="New Century Schoolbook, Times New Roman, serif"><font
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size="5"><b>CheckTandTd</b></font></font>
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<br>
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<br>
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<font face="New Century Schoolbook, Times New Roman, serif"><font
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size="3"><b>Introduction</b></font></font>
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<br>
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<br>
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<font face="New Century Schoolbook, Times New Roman, serif">The
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<i style="font-weight: bold;">CheckTandTd</i> procedure is intended to
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be a final check on the
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Temperature (T) and Dew Point (Td) grids. The tool checks that the
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following meteorological conditions are maintained throughout the
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forecast database: </font>
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<br>
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<br>
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<font style="font-weight: bold;"
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face="New Century Schoolbook, Times New Roman, serif">MinT <=
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T <= MaxT</font><span style="font-weight: bold;">
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</span><br style="font-weight: bold;">
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<br style="font-weight: bold;">
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<font style="font-weight: bold;"
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face="New Century Schoolbook, Times New Roman, serif">Td <=
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T</font><span style="font-weight: bold;">
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</span><br>
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<br>
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<font face="New Century Schoolbook, Times New Roman, serif">Optionally,
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the tool can be run to show the time and area over which the above
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conditions are violated.</font>
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<br>
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<br>
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<br>
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<big><big><font style="font-weight: bold;"
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face="New Century Schoolbook, Times New Roman, serif">How
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the Procedure Works</font><span style="font-weight: bold;">
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</span></big></big><br>
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<br>
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<font face="New Century Schoolbook, Times New Roman, serif">The
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CheckTandTd procedure begins by retrieving all of the MinT, MaxT, T,
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and Td grid inventory. These timeRanges are used later throughout
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the code, and allow the tool to work in any time zone. Next, each
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MinT grid and all T grids that correspond to the associated MinT
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timeRange are retrieved. Using numpy, each T grid is
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compared with the MinT grid to identify where T grid points are lower
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than the MinT grid. A temporary grid is created (named TLessThanMin)
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that highlights where this condition is met by flagging the grid with
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a value of one (1). All other points are set to zero. An example of
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the resulting “Highlight” grid is shown in Fig. 1. The points
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that are set to one (appearing red by default) are used to create an
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editArea, whereby a SmartTool can be called to set the T grid points
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to the MinT grid values where T < MinT.</font>
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<br>
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<br>
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<br>
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<img alt="CheckTandTd grid" src="images/CheckTandTdGrid.jpg"
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name="Graphic1"
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style="border: 0px solid ; width: 299px; height: 282px;">
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<br>
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<br>
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<font face="New Century Schoolbook, Times New Roman, serif"><font
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size="2">Fig.
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1. Example of theTLessThanMin “Highlight” grid, with grid points
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shaded in red where the T is less than the corresponding Minimum T.</font></font>
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<br>
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<br>
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<font face="New Century Schoolbook, Times New Roman, serif">An
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identical set of steps is performed on the T grids again, but in this
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case the MaxT grid is used for comparison, and a temporary highlight
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grid (named TGreaterThanMax) is created. All grid points with T
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greater than MaxT at the same point and time are used to make the
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editArea. A different SmartTool is called to set the T grid points to
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the MaxT grid values where T > MaxT. </font>
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<br>
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<br>
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<font face="New Century Schoolbook, Times New Roman, serif">Finally,
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a third check is performed to ensure that the Td grids are always at
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or below the T grid for the same point and time period. The same
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steps are performed as in the previous two checks, and the resulting
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highlight grid (TdGreaterThanT) shows where the Td grids are greater
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than the T grids. Anywhere/time the Td grid points are greater than
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the T grid, a SmartTool is called to adjust the Td to the T value.</font>
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<br>
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<br>
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<br>
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<big><big><font face="New Century Schoolbook, Times New Roman, serif"><b>Running
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the Procedure</b></font>
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</big></big><br>
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<br>
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<font face="New Century Schoolbook, Times New Roman, serif">When
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the Procedure is envoked, users are presented with two options:
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“Check Only” and “Force” (see Fig. 2). The CheckOnly option
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will not modify any grids. It will simply generate the respective
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highlight grids at times where the T or Td grids violate the
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meteorological checks. Forecasters may examine these grids to get a
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better idea of where and when the grids are inconsistent.</font>
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<br>
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<br>
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<br>
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<img alt="CheckTandTd User Interface" src="images/CheckTandTdUI.jpg"
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name="Graphic2"
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style="border: 0px solid ; width: 392px; height: 157px;">
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<br>
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<font size="2"><font
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face="New Century Schoolbook, Times New Roman, serif"><br>
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Fig.
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2. The <i>CheckTandTd</i> Tool GUI.</font></font>
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<br>
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<br>
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<font face="New Century Schoolbook, Times New Roman, serif">The
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second option, Force, will run the set of SmartTools that maintain
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balance between the MinT, MaxT and T grids and between the T and Td
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grids. Selecting this option and running the tool will likely cause
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many T grids to be modified. Any grids that are locked by other
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forecasters will, of course, not be modified, so it is important that
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you make sure the entire set of T and Td grids are saved (unlocked)
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before running this tool.</font>
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<br>
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<br>
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<font face="New Century Schoolbook, Times New Roman, serif">No
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special configuration is required with this tool.</font>
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</body>
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</html>
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