David Williams
EF4
Good-day,
I had a question for those of you that are familiar with changes made to radar PRF. I was just watching the current tornado-warned storms in Texas with PYKL3 on my Android. I was looking at storm relative motion tilt 1 and noticing the increased velocities associated with tornado reports out there. As I was watching, the couplet was free of any aliasing or range folding. However, in the very next scan, the couplet area in addition to all other velocities at that distance from the radar were covered by an arch of purple aliasing pixels. That was frustrating because it was right over the couplet. Then, the next scan moved the arch of aliasing about 20 nautical miles behind the storm couplets and gave me a free view again.
My question is whether that change in disturbance/aliasing in the radar had to do with someone at the NWS site in Amarillo (or wherever) changing the PRF of the radar? I'm wondering if in one volume scan the PRF frequency was increased too high to the point where it put the intended velocity target they were trying to get a better view of into the zone of aliasing/range folding? So, on the next scan they backed off the frequency a bit to make the target range a bit further out so they could observe the storms better. Is that a possible explanation or is that not how PRF changes works at all and it can't just be changed from volume scan to volume scan.
I had a question for those of you that are familiar with changes made to radar PRF. I was just watching the current tornado-warned storms in Texas with PYKL3 on my Android. I was looking at storm relative motion tilt 1 and noticing the increased velocities associated with tornado reports out there. As I was watching, the couplet was free of any aliasing or range folding. However, in the very next scan, the couplet area in addition to all other velocities at that distance from the radar were covered by an arch of purple aliasing pixels. That was frustrating because it was right over the couplet. Then, the next scan moved the arch of aliasing about 20 nautical miles behind the storm couplets and gave me a free view again.
My question is whether that change in disturbance/aliasing in the radar had to do with someone at the NWS site in Amarillo (or wherever) changing the PRF of the radar? I'm wondering if in one volume scan the PRF frequency was increased too high to the point where it put the intended velocity target they were trying to get a better view of into the zone of aliasing/range folding? So, on the next scan they backed off the frequency a bit to make the target range a bit further out so they could observe the storms better. Is that a possible explanation or is that not how PRF changes works at all and it can't just be changed from volume scan to volume scan.
