Post-Frontal Wind
Pre-Frontal Wind
Figure 67 Typical Shear Line Example
The
SLINE
product can detect sudden wind shifts and provide advance warning of their
approach, with best estimates of the arrival time and the expected speed and direction of
the new wind.
1. Select
Type > SLINE
.
2. To load an existing product, select
File > Open
3. In
Data:Display
, select
V Shear
.
4. In
EL Angle
, define the elevation angle of data you want to display.
Wind shears associated with gust fronts and microbursts are usually low-level
phenomena, so angles of 1° or less are typically used to detect these.
You may select 1 or 2 angles. If you select 2 angles, make sure both are above the
threshold to be included in the shear line.
5. Define
Rng / Az Filter
.
The first number defines the range length scale for the
SHEAR
product, in km. This
distance determines the size of the skip that the
SHEAR
product can tolerate when
differencing over missing data. It also specifies the length of the radial smoother, which
is applied before the XY smoother.
The second number is the azimuth length scale in degrees.
The skipping and azimuth range length are analogous to the range filter.
Chapter 5 – Configuring and Scheduling Optional IRIS Products
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189
Summary of Contents for IRIS
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