Convection Quiz 1 1.Radar Mode: Conventional, Doppler or Dual Polarized?Conventional, 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 Ahead Warm Front Upstream from Col 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 AB Questions Home Placeholder Pending Development These questions will all need reworking of course.

Questions Page Convection Quiz 1 Return To Questions Analysis & Diagnosis 2 Yes, it certainly is a Doppler radar image. The blue colours toward the radar and the red 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

Questions Page Convection Quiz 1 Return To Questions Analysis & Diagnosis 3 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!

Questions Page Convection Quiz 1 Return To Questions Analysis & Diagnosis 4 Yes, this image is located ahead of a warm front under the col with a divergent wind pattern as revealed by Doppler radar. The low level wind within the CCB is easterly so the surface warm front is still to the south. East of the radar the winds are southwesterly. West of the radar the winds are southeasterly. This divergent pattern is also referred to as the “Screaming Eagle pattern. You are correct! Congratulations

Questions Page Convection Quiz 1 Return To Questions Analysis & Diagnosis 5 Sorry… that is not the answer we were looking for… Sorry… east of the WCB col, the winds would tend to veer with height (katabatic warm front) – both to the left and to the right of the radar. These winds do not show that pattern above the CCB which is clearly identified by the easterly low level winds.

Questions Page Convection Quiz 1 Return To Questions Analysis & Diagnosis 6 Sorry… that is not the answer we were looking for… Sorry… west of the WCB col, the winds would tend to back with height (anabatic warm front) – both to the left and to the right of the radar. These winds do no show that pattern above the CCB which is identified by the easterly low level winds. Try again.

Questions Page Convection Quiz 1 Return To Questions Analysis & Diagnosis 7 Sorry… that is not the answer we were looking for… Sorry… the CCB which is identified by the eastlery low level winds does not fit into the cold frontal conceptual model. This Doppler Radar image is cannot be associated with a cold front. Think warm thoughts.

Questions Page Convection Quiz 1 Return To Questions Analysis & Diagnosis 8 Sorry… that is not the answer we were looking for… Sorry… “Sunny No Rain” for A doesn’t compute. There is at least overcast cloud producing the precipitation being sensed by Doppler. It is likely virga with the katabatic warm front and the fresh, dry and cool undercutting CCB. Good sense of humour though – one must laugh! AB

Questions Page Convection Quiz 1 Return To Questions Analysis & Diagnosis 9 Sorry… that is not the answer we were looking for… Sorry… “Sunny No Rain” for B doesn’t compute. There is at least overcast cloud producing the precipitation being sensed by Doppler. In fact, it is likely significant rain with the anabatic warm front. The underctting CCB won’t be as dry or as cool as it was before the WCB started to drop precipitation into it.. Good sense of humour though – one must laugh! AB

Questions Page Convection Quiz 1 Return To Questions Analysis & Diagnosis 10 Yes. “Rain increasing” for A does compute since the significant rain hasn’t really started yet. The precipitations sensed by the Doppler could even just be virga. Remember that this is the katabatic part of the warm frontal model associated with the conveyor belt conceptual model. You are correct! Congratulations AB

Questions Page Convection Quiz 1 Return To Questions Analysis & Diagnosis 11 Sorry… that is not the answer we were looking for… Sorry… “Rain increasing” for B doesn’t compute. The rain should be at about the maximum intensity under the divergent, anabatic portion of the warm front. The precipitation could still remain significant but probably not increase much. Remember of course that this is an idealized, perfect world answer… not all simple answers can be right for these simplified questions. AB

Questions Page Convection Quiz 1 Return To Questions Analysis & Diagnosis 12 Sorry… that is not the answer we were looking for… Sorry… “Rain decreasing” for A doesn’t compute since the significant rain hasn’t really started yet. The precipitation sensed by the Doppler could even just be virga. How would you check to see if this is true? Conventional radar cross-section perhaps or even a look at an observation? Good sense of humour though – one must laugh! AB

Questions Page Convection Quiz 1 Return To Questions Analysis & Diagnosis 13 Yes. “Rain decreasing” for B does compute! The rain should be decreasing from its maximum intensity under a divergent flow aloft and an anabatic warm front. Of course, this is a fun generalization designed to promote investigation into the real world of meteorology. You are correct! Congratulations AB