Quiz 06 1.Radar Scan Mode for the small radar image: CAPPI or PPI? Hint, both radar images are for the same time.CAPPI PPI 2.What conceptual model do the images 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 BAB Rain Increasing A BA B Rain Decreasing A BAB Questions Home AB A B AB

Quiz 06 Return To Questions Analysis & Diagnosis 2 Yes, it must be a CAPPI image – you had a chance of being right. Did you guess? Your answers to the following questions will find out. You are correct! Congratulations

Questions Home Quiz 06 Return To Questions Analysis & Diagnosis 3 Sorry… that is not the answer we were looking for… Sorry… it is not a PPI. You did have a chance of guessing the right answer and you guessed wrong. You now know the correct answer. Hint!

Questions Home Quiz 06 Return To Questions Analysis & Diagnosis 4 Yes, “Ahead Warm Front Downstream from Col” is the best conceptual model. This Doppler image shows winds strongly veering with height. Strong veering is located to the right of the WCB in the CBCM. Strong veering is also associated with warm advection. This is most likely associated north of a warm front. In this 3.5 PPI Doppler display the short range, low elevation precipitation void is characteristic of the “Virga Hole”. Virga is most likely north of the warm front and downstream from the col. Where are the DCB easterly winds? You are correct! Congratulations

Questions Home Quiz 06 Return To Questions Analysis & Diagnosis 5 Sorry… that is not the answer we were looking for… Sorry… “In Warm Sector under WCB “ doesn’t compute. The winds are veering and one would expect the winds to be nearly a straight flow in the warm sector in consideration of the “Gull” conceptual model.

Questions Home Quiz 06 Return To Questions Analysis & Diagnosis 6 Sorry… that is not the answer we were looking for… Sorry… “Ahead Warm Front Under Col “ Ahead Warm Front Under Col… under a col, the winds must diverge. This is a complicated image but if if you look at the elevated winds, they all veer. Click for an illustration of this. Try again. veer

Questions Home Quiz 06 Return To Questions Analysis & Diagnosis 7 Sorry… that is not the answer we were looking for… Sorry… “Behind Cold Front Left of Col “ … would require backing winds – these winds veer. A conceptual model linked to a cold front is not a fit… Try again.

Questions Home Quiz 06 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 and “A” is north of the warm front. This precipitation is virga as evidenced by the PPI virga hole. It is not raining now at A but neither is it sunny. If you thought there was no precipitation between A and B at the radar, you are partly right but there is virga – just no precipitation reaching the ground. Good sense of humour though – one must laugh! AB

Questions Home Quiz 06 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. The virga hole to the east of B indicates that it is likely not raining yet but it will. The skies are definitely overcast with virga so “Sunny” doesn’t compute. Good sense of humour though – one must laugh! AB

Questions Home Quiz 06 Return To Questions Analysis & Diagnosis 10 Yes. “Rain increasing” for A might compute. Doppler does show some kind of precipitation aloft (see the PPI virga hole) but without conventional or dual polarized information, the intensity is unknown. Remember that Doppler ONLY gives radial velocity. It is unclear how far away to the west from A that the precipitation actually reaches the ground. 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

Questions Home Quiz 06 Return To Questions Analysis & Diagnosis 11 You might be correct! Congratulations Yes. “Rain increasing” for B does compute. The PPI Doppler clearly reveals the “virga hole” signature. So there is precipitation above B getting down to about 1.6 km. Doppler does not reveal precipitation intensity – only radial velocity. A quick glance at the 1.5km CAPPI on the Question page reveals that there is no precipitation at either A or B at 1.5km. The CAPPI does not show the virga aloft. As a result, this answer might be right – but we need more data to be sure. It is not raining now at B but it is likely to rain in the future. AB

Questions Home Quiz 06 Return To Questions Analysis & Diagnosis 12 Sorry… that is not the answer we were looking for… Sorry… “Rain decreasing” for A doesn’t compute. If you though there was no rain upstream from rain because of the “Virga Hole” who are partly right and mostly wrong. There is virga and sooner or later there will be rain. In addition, the PPI virga hole signature shows that it is not raining now at A so how can the precipitation decrease from no rain? Good sense of humour though – one must laugh! AB

Questions Home Quiz 06 Return To Questions Analysis & Diagnosis 13 Sorry… “Rain decreasing” for B doesn’t compute. The PPI virga hole signature shows that it is not raining now at B so how can the precipitation decrease from no rain? Good sense of humour though – one must laugh! Sorry… that is not the answer we were looking for… AB