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WX 301 Convective Radar & Weather Exam Latest Update
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WX 301 Convective Radar & Weather Exam Latest UpdateBelow is the NWS surface analysis for Oct. 16, 2013 at 0Z. The green areas have
precipitation falling at that time.
Notice that synoptic scale features of the overall weather pattern include a low pressure
system in the upper midwest with a cold front extending from Wisconsin through west
Texas. Now notice the Texas region, particularly the area of southwest Texas proximal
to the town of Del Rio with the airport ID of KDLF, which is displayed within the red box
near the Mexican border in southwest Texas.
How is the green area of precipitation around KDLF located relative to the cold front?
Precipitation is primarily to the north of the cold front in Texas
Next, view the radar image from KDFX Laughlin AFB, Texas which is near Del Rio, Texas.
Using the color bar on the right, view the image to find the highest reflectivity (in dbZ)
depicted in the radar. What approximately is the highest reflectivity you found?
50-59 dbZ
Using the table below relate the maximum reflectivity of the radar from the previous
question to rain intensity.
What is the intensity level of the radar in the areas where you found the maximium
reflectivity?
Extrem, echo intensity 5-6, echo dbz greater than 50, convective rainfall rate greater
than 2.5 inches/hr
, Above you found the maximum reflectivity to the southwest of DFX (center of the
picture). Now examine the DFX radar for the area of precipitation to the northeast of
DFX.
What dbZ reflectivity range to the northeast of DFX (DFX is at the center of the image)
best describes the observed values?
mostly 30-39 dbZ
Use the following chart to relate the reflectivity to the north east of the radar to rain
intensity.
Figure 15.4.5 Average reflectivity over certain areas of interest in the NE
What is the intensity level of the radar in the areas where you found the average
reflectivity?
Moderate, echo intensity level 2 echo dbz 30-40, convective rainfall rate .1 to .5 inch/hr
The WSR-88D radars can operate in one of two different modes: clear air mode and
precipitation mode.
Look at the colors on the radar displays and at the corresponding dbZ values on the
right side color bar. From the intensities of the radar reflectivities, what mode of
operation are the radars in?
Precipitation Mode
NEXRAD Radar Images
The following image shows the lightning data for this case obtained from Vaisala's web
page at 02Z.
Note the valid time of the data on the image is 1:40 Z. Why is the valid time of the
lightning data pulled from the web different than the time that the data was
downloaded?
The lightning network and data are privately owned and real time data is only available
by paid subscription services. Free data on the web is delayed for about 20-30 minutes
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