Hydraulic Jumps?

Bernard Eckey was a great article in June/July S&G on hydraulic jump.
I've never had the experience of flying in this - anybody here done so?
All the wave flying I've done has been classic wave (primarily ground
induced, but also lots of thermal wave)...

It seems the conditions for this might occur in Colorado?
Sierra lee is mentioned but I've never seen it flying from Minden.

Interested to hear of any experiences with this!

See ya, Dave

Interesting, dense air layer usually identified by a roll type cloud.

On Thursday, August 24, 2017 at 4:08:26 PM UTC-7, Dave Nadler wrote:
Bernard Eckey was a great article in June/July S&G on hydraulic jump.
I've never had the experience of flying in this - anybody here done so?
All the wave flying I've done has been classic wave (primarily ground
induced, but also lots of thermal wave)...

It seems the conditions for this might occur in Colorado?
Sierra lee is mentioned but I've never seen it flying from Minden.

Interested to hear of any experiences with this!

See ya, Dave

Warner Springs, CA is known for its hydraulic jump.

Sean Franke

On Thursday, August 24, 2017 at 7:52:49 PM UTC-4, Sean Franke wrote:
Warner Springs, CA is known for its hydraulic jump.

Flyable - you've flown it?
What discontinuity causes the jump?
How can you recognize it (vs. classc wave)?

Thanks!
See ya, Dave

PS: Good job at Uvalde!

I am sure you are familiar with Bob Whelan's "Exploring the Monster." about the early wave experiments in the Owens Valley in the 1950's. The Owens and Sierra Nevada wave is a classic example of what a hydraulic jump can offer. 49,000 ft. off of a 14,000 foot mountain range is pretty impressive. (Bob Harris 1986, G-102)

Described very well in the fantastic book "Dancing with the Wind" as well

We tend to get both traditional wave and hydraulic jumps in northern Utah. We also get compression wave in areas where two ranges are close enough to cause interference. I would love to see models that predict some of the dynamic flying we see in the fall through spring. I have had 10 knots straight off a ridgeline to 18,000 feet and other unexpected lift areas.

On Friday, August 25, 2017 at 9:18:40 AM UTC-4, Tim Taylor wrote:
We tend to get both traditional wave and hydraulic jumps in northern Utah.. We also get compression wave in areas where two ranges are close enough to cause interference. I would love to see models that predict some of the dynamic flying we see in the fall through spring. I have had 10 knots straight off a ridgeline to 18,000 feet and other unexpected lift areas.

Compression wave? We have had real wave and low lying rotor here in Michigan which is flat as a pancake. Could this be a compression wave phenomenon? Would love to have some literature reference to read about this! Any references?

Thanks!

Compression wave is when wave from one ridge ends up intersecting with a downwind ridge. If the wavelength is correct you end up with the downward flow of a primary or secondary flowing into the face of the second ridge. This causes the wave to deflect upward on the face of the second ridge. We have ridges about 15 miles apart and often get a interference from the secondary wave from the first ridge on the face of the second ridge.

On Sunday, August 27, 2017 at 7:57:40 PM UTC+3, wrote:
On Friday, August 25, 2017 at 9:18:40 AM UTC-4, Tim Taylor wrote:
We tend to get both traditional wave and hydraulic jumps in northern Utah. We also get compression wave in areas where two ranges are close enough to cause interference. I would love to see models that predict some of the dynamic flying we see in the fall through spring. I have had 10 knots straight off a ridgeline to 18,000 feet and other unexpected lift areas.

Compression wave? We have had real wave and low lying rotor here in Michigan which is flat as a pancake. Could this be a compression wave phenomenon? Would love to have some literature reference to read about this! Any references?

I've read somewhere that in the right conditions (profiles of stability and wind speed with altitude) cumulus cloud streets can trigger wave. Or convergences.