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Dan wrote:
For those of you with a Garmin 396, how do you avoid dangerous weather, avoid yellow and steer clear of the lightning strike indications? I am considering the purchase of one and am wondering how to use the info safely, but yet with the maximum utility. Dan, I have only been in a few such situations since I bought the 396 last year, and my experience is that you can fly through green all day long. Yellow is okay as well provided it's not convective (forecasts, a nearby lightning strike or cell data icon are a few ways one may determine that). I always stay clear of red, since it's always convective. The deep orange color can go either way -- I remember a day of soaking rains that were displayed as yellow and orange, but there were no thunderstorms in the area because the temperature and atmospheric conditions simply didn't support convection on that scale. I have also confirmed the lag in delivery and concur with the other poster who suggested you determine the direction of movement and circumnavigate on the upwind side of the cells only. I was flying commercially one day, relocating an aircraft for some jump operations, and had to wind my way through many cells. I expedited my departure from the Danbury, CT airport as I watched one cell about 10NM in diameter approach the airport. The outer edges of the cell, depicted as green, reached the edge of the airport where I was doing my runup when light rain started. But that cell was crawling -- almost stationary. Enroute, I watched one cell literally explode and move at better than 30K. It took a mere three updates (15min) from this to go from one pixel, or 2sq nm green (a "harmless shower") to a cell being tracked upwards of 25K feet with lots of red in its core. As I watched it in real time outside the window, it was clearly several (7-10) miles ahead of its indicated location, though the diameter of the rain shaft appeared roughly correct. I just flew from NJ to SC and used the 396 for its true intended purpose -- peace of mind. I could see the top-down weather picture and make sure that the weather was not developing outside the scope of the forecast. That is the way the 396 weather capability should be used -- not for close-in tactical avoidance. If you want to play that game, get on-board radar and a stormscope...and even then second guess whether you want to fly in those conditions. A few caveats: Keep in mind that I've seen shower activity (level 1, maybe 2) that does NOT show up on the Garmin AT ALL. Do not expect to use the 396 to stay dry. For whatever reason, it doesn't work that way. Also, the 396's lightning data is derived from a network that records cloud-to-ground strikes only. Cloud to cloud strikes are thus not shown on the 396 -- you need a stormscope to see those. Hope this helps. Safe flying, -Doug -------------------- Doug Vetter, ATP/CFI http://www.dvatp.com -------------------- |
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![]() "Doug Vetter" wrote: I always stay clear of red, since it's always convective. Not always, but it is probably safest to assume it is. -- Dan C172RG at BFM |
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