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Lampasas/Cove/Killeen Zoom
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for larger image)
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Click on Image to view local area Doppler Radar This Doppler view will rotate
between local view and wide area view, It will auto update every 2 mins.
Reflectivity
- The amount of power returned back to the radar from airborne particles,
insects or other objects. Units are logarithmic (dBZ). Values can range from
-28 to over 75, and different scales may be used depending on whether the radar
is in clear air or precipitation/storm mode. Particular values do not
necessarily correspond to different precipitation types (rain, sleet, snow,
etc...) and many atmospheric conditions can provide a variety of phenomena to
appear. |
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Total Accumulated Precipitation
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Click on Image to view Doppler Radar
Precipitation - A great benefit of Doppler
radar is its ability to estimate fallen precipitation, in order to fill in the
holes left by observation networks, automated rain gages, and other sources of
data. Measured in inches, Doppler Radar can estimate precipitation that has
fallen over the past hour, three hours, and storm total. Note the beginning and
ending times on the storm total imagery. The radar requires several hours of no
precipitation before resetting, and areas that receive a lot of rainfall can
have this image piling up for days if not weeks! Also note that precipitation
can be severely overestimated due to storms which contain hail and the freezing
level, as partially melted ice returns an extremely high reflectivity. |
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Echo
Tops
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Click on Image to view Doppler Radar
Echo Tops - Simply image depicting the estimate
of storm cloud tops. Note that depending on the tilt of the radar beam and
distance from the radar, these can be severely over or under-estimated on the
order of 5-10,000 feet or more. |
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VAD
Wind Profile
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Click on Image to view Doppler Radar
SRM - Stands for "Storm Relative Map". Same as
above except the motion of the storms (entered by the radar operator) is
subtracted out. Therefore, the wind field relative to a storm of interest can be
observed. This is used to detect storm scale rotation or other features which
could signify the onset of very large hail, a downburst, or possibly a tornado. |
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Layer Reflectivity Max
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Click on Image to view Doppler Radar
Layer Reflectivity Maximum - More of a use for
pilots, this product is a coarse resolution image (4km) which provide the
maximum reflectivity at different layers in the atmosphere: lower, middle and
upper. |
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Base Velocity 0.5
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Click on Image to view Doppler Radar
Velocity - Doppler radar can detect winds
blowing toward or away from the radar, called Radial Velocity. NOTE: the radar
can again only detect that portion of the wind which is blowing along the radar
beam. For example, if you are looking south from the radar, and the wind was
blowing from the west or east at even 80 mph, the radar would see 0 knots
because the wind is blowing perpendicular to the beam. Also note that the radar
beam extends higher and higher the farther you go from the radar. Novice users
often mistake high winds aloft (fairly common) for strong winds at the surface.
Velocity imagery can take years of experience to master and can fool even the
most experienced.
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Vertical Integrated
Liquid
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Click on Image to view Doppler Radar
VIL - Vertically Integrated Liquid. A coarse
resolution image that is basically a measure of the total liquid in a vertical
column, in units kilograms per square meter. Most used to identify storms with
heavy rainfall or large hail. Can also be used in combination with other
products to predict the onset of wind damage. |
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Composite Reflectivity
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Click on Image to view Doppler Radar
Composite (Reflectivity)
- Same as above, except instead of viewing the reflectivity at one radar
tilt, this image displays the MAXIMUM dBZ value at any elevation tilt for a
given location. Basically, if you were standing 30 miles east of the radar, and
above you, the radar sampled dBZ values of 5, 25, 30, 34, 52, 40, 37, and 22 at
different heights...the image would display 52 dBZ for your location. Used to
show the most intense storms and hail cores aloft. Used by radar operators as
more of a "catch all" as it is the last product received per volume scan (one
complete radar sweep of the atmosphere). This image is also accompanied for the
Storm Cell Attributes Table. |
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All
Doppler Views (Auto View)
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Click on Image to Auto Rotating Doppler Radar |
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Composite Radar Help
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Click on Image to view Composite Radar Help Screen |
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