Quiz 10 1.Radar Mode for the radar image: Conventional, Doppler or Dual Polarized? Hint, the small...

Quiz 101. Radar Mode for the radar image: Conventional, Doppler or Dual Polarized? Hint, the small image is a blend of satellite and conventional radar data.

2. What conceptual model does the image relate to? Pick from the list of possible options.

Ahead Warm Front Downstream from Col

Ahead Warm Front Under Col

In Warm Sector under WCB

Behind Cold Front Left of Col

3. What is the short range forecast for point?

Sunny-No Rain A B

Rain Increasing A B

Rain Decreasing A B

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AB

Analysis & Diagnosis 2Questions Home Quiz 10

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Yes, it certainly is a Doppler radar image.The blue/green colours toward the radar and the red /yellow colours away from the radar are characteristic of Doppler data. There is no signature related to either precipitation intensity (conventional radar) or precipitation phase or shape (dual polarized radar). Radial velocity of the precipitation hydrometeor is the only data displayed.

You are correct! Congratulations


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Sorry… that is not the answer we were looking for…

Sorry… the colour scheme does not relate well to precipitation intensity (conventional radar) which would require a uniform increase in precipitation intensity from south to north or precipitation phase/shape (dual polarized radar) which would require distinctly different precipitation shapes across the boundary.Try again and think of the radial motion of precipitation as measured a the radar. Hint!


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Yes, “In Warm Sector under WCB” is the best conceptual model. This Doppler image is located southwest of a warm front under the WCB. There is no indication of the CCB so the Doppler winds are entirely within the warm sector. There are some minor “veerings” and “backings” with height but generally the flow is unidirectional from the southwest. The veering in the lowest levels can be explained by the Ekman Spiral. The weak backing aloft both to the southeast and northwest of the radar would suggest that the radar placement is more to the left of the main WCB.

You are correct! Congratulations


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Sorry… Ahead Warm Front Downstream from Col doesn’t compute. The boundary is oriented northwest to southeast as one would expect for a warm front but there is no indication of a CCB. If there is no CCB then the radar must be located in the warm sector of the synoptic scaled system (Hint). “Ahead of the Warm Front” is not the right conceptual model.


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Sorry… Ahead Warm Front Under Col… under a col, the winds must diverge. The boundary is oriented northwest to southeast as one would expect for a warm front but there is no indication of a CCB. If there is no CCB then the radar must be located in the warm sector of the synoptic scaled system (Hint). “Ahead of the Warm Front” is not the right conceptual model – either upstream from, under or downstream from the col. Try again.


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Sorry… Behind Cold Front Right of Col…To the right of the col the winds must veer with height. These do not so the conceptual model is not a fit… but it does look like a cold front for sure. The orientation of the boundary is northeast to southwest, perfect for a cold front and consistent that there is CAA in the lowest levels under the boundary. Close but not quite right. Try again.


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Sorry… “Sunny No Rain” for A doesn’t compute. There is at least overcast cloud producing the precipitation being sensed by Doppler and although “A” is in the warm sector there is still some precipitation upstream. Note that Doppler is sensing precipitation to very low elevations at the radar site.Good sense of humour though – one must laugh!

AB


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Sorry… “Sunny No Rain” for B doesn’t compute. There is at least overcast cloud producing the precipitation being sensed by Doppler. To the east of B at the radar site, the precipitation extends to the ground. It is unclear how far the precipitation extends to the west given the spatial extent of the radar – out to 220 km at best – less if the echo tops are lower in the atmosphere.Good sense of humour though – one must laugh!

AB


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Yes. “Rain increasing” for A might compute. Doppler does show some kind of precipitation upstream but without conventional or dual polarized information, the intensity is unknown. Remember that Doppler ONLY gives radial velocity. It is unclear how far the precipitation extends either to the east or to the west given the spatial extent of the radar – out to 220 km at best – less if the echo tops are lower in the atmosphere. As a result, this answer might be right – but we need more data to be sure. At least, the answer isn’t wrong.

You might be correct! Congratulations

AB


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Sorry… that is not the answer we were looking for… but you might still be right…

Yes. “Rain increasing” for B might compute. Doppler or any radar (conventional or dual polarized ) cannot show precipitation upstream. In addition, remember that Doppler ONLY gives radial velocity. It is unclear how far the precipitation extends to the west given the spatial extent of the radar – out to 220 km at best – less if the echo tops are lower in the atmosphere. As a result, this answer might be right – but we need more data to be sure. At least, the answer isn’t wrong.

AB


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Sorry… “Rain decreasing” for A doesn’t compute. Doppler shows some kind of precipitation at low elevations angles upstream from A. Remember that Doppler ONLY gives radial velocity and the conventional and/or dual polarized radar is required to give details on the intensity of the precipitation and/or the characteristics of the hydrometeors. Perhaps take a look at an observation? Good sense of humour though – one must laugh!

AB


ReturnTo Questions

Yes. “Rain decreasing” for B might compute but we cannot know for sure based only on the Doppler image. Doppler or any radar (conventional or dual polarized ) cannot show precipitation upstream from B. In addition, remember that Doppler ONLY gives radial velocity. It is unclear how far the precipitation extends to the west given the spatial extent of the radar – out to 220 km at best – less if the echo tops are lower in the atmosphere. There is precipitation to very low elevations detected at the radar site. As a result, this answer might be right – but we need more data to be sure. At least, the answer isn’t wrong.

Sorry… that is not the answer we were looking for… but you might still be right…

AB

Quiz 10 1.Radar Mode for the radar image: Conventional, Doppler or Dual Polarized? Hint, the small...

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