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Decision Making for XC and wave soaring from Byron Ramy Yanetz February 2010.

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Presentation on theme: "Decision Making for XC and wave soaring from Byron Ramy Yanetz February 2010."— Presentation transcript:

1 Decision Making for XC and wave soaring from Byron Ramy Yanetz February 2010

2 Byron Soaring Potential  Great and consistent soaring conditions are only 20 miles away from March till October  Strong convergence often marked with clouds over the San Antonio Valley in the Diablo Range (between Rel 1, Red Mountain and Mt Stake), persists all day with typical altitude of , occasional 10,000 feet (highest 13,500!).  Easy glide back to Byron or Tracy.  May require miles ft tow to Rel 1,2,3 when local lift not presents.  25 miles 70 knots = 30 minutes tow plane round trip ($82).  Equivalent in cost and time to 2 typical tows  10/14 saw 6 high tows to the Diablo range in a period of 3 hours resulting in record distance and altitude (13,000 feet)!

3 Where to Release?  Make sure to use the Hollister database to find the release area  Tow towards release 1 (Rel 1) at knots so you will arrive there between feet in about 15 min.  Release (or stay on tow) and proceeed towards Rel 2 along the spine until you find your first lift.  No need to stay on tow beyond Rel 2 or above 7000 feet which is sufficient altitude to search for lift without loosing glide to Byron  First lift is usually near Rel 2  If not proceed to Rel 3 and/or to Red Mountain on the edge of the San Antonio valley  The lift is almost always in the area between Rel2,3, and Red Mountain.  Follow the convergence line between red mountain and Mt Stake  If no lift found head back to Byron before loosing glide (or Tracy if Byron is not in glide).  Easy in a 40:1 ship but also doable in a Grob

4 Release Area

5 Landout options  Meadowlark (good strip, friendly owner, easy ground retrieve)  San Antonio Valley (in the Diablo Range) - Landing strip and good fields – 1 hour drive from Byron (locked gate but key is available)  Tracy – Quick aeroretrieve (< $50)  New Jerusalem  Patterson  Crows Landing (Huge, but access unknown)  Gustine  Los Banos

6 How to use blipmaps to determine when to tow to the Diablo Range  NAM BLTop > 6000 ft  NAM Cu potential >= 0 and Cu Base > 6000 ft  RASP Hcrit > 6000 ft  However If NAM predicts good cu’s (cu potential > 0) and cloud base of at least 4000ft all the way north across the delta then plan to fly north towards Rio Vista and Williams  Detrermine best time to launch. Typically no later than noon, and as early as 10AM if the 10AM RASP indicates good lift.

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10 Byron Wave  Byron wave season Nov-April  Pre frontal wave is best during the hours before the onset of rain with increasing SW winds.  Pre Frontal Wave can be found anywhere between Byron and Los Vaqueros reservoir  Often marked with Lenticular clouds or foehn gaps  Pre frontal wave can be over wide area between Mt Diablo to Mt Oso along the mountain range

11 Diablo North wind Wave  Usually during high pressure off shore events from Nov – April  Requires NNW-NNE winds above 20 knots at Mt Diablo  Usually not marked by clouds other than some high clouds  Wave is typically weak (1-2 knots) and very small area (less than 1 square mile) between Wave1 and Class Bravo  Due to significant sink surrounding the wave it is crucial to tow all the way to the wave. Avoid the temptation to release early!  Stay in the area and move over class bravo if necessary when above 10K.  Typical altitude 12-18K

12 Wave 1

13 How to use blipmap to recognize good wave day  Ignore all the thermal related parameters (BLTop, Hcrit, Cu Pot, BL Up/Down, Convergence)  Focus on winds aloft (Wind Speed and direction at boundary layer) and wave parameters.  NAM is available up to 3 days in advance but only indicates wind. Look for wind above 15 knots from the North or SW.  RASP wave parameters, especially the 750m model (available late in the prior evening) are the best indicators.  Check the vertical velocity at 850, 700 and 500 mb as well as the Mt Diablo Cross section. Should be over 100 cm/s (2 knots) for a usable wave.  On the day itself check the wind on top of Mt Diablo online or by phone. Look for average wind speed above 20 knots from the SW or from the north.

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16 Resources  Go to NCSA web site and study the cross country and weather sections, as well as the RASP links  Download latest waypoints for Byron/Hollister area  Mt Diablo wind (925) bin/roman/meso_base.cgi?stn=MDAC1&unit=0&time=LOCAL bin/roman/meso_base.cgi?stn=MDAC1&unit=0&time=LOCAL bin/roman/meso_base.cgi?stn=MDAC1&unit=0&time=LOCAL  Study routes using google map hllstr0b.kmz&z=7 hllstr0b.kmz&z=7 hllstr0b.kmz&z=7  Study landouts data  Download IGC files from OLC and study with SeeYou


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