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June 2025 Newsletter 71
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THE GREEN FLASH
Written by Doug Weibel, SV Frolic
Have you seen the Green Flash? If you have not, then do not watch the Pirates of the Caribbean movies and set your expectations by what you see there. Real green flashes are not so flashy, but are pretty special nonetheless.
Most often, the green flash is seen as the sun sets over water with no clouds on the horizon. Just as the sun is going out of sight over the horizon, its light is refracted by layers of the lower atmosphere. A green flash is most likely on warm, calm evenings with an inversion. Seeing a green flash over the ocean often involves an inversion caused by the warmed daytime air sitting over the constant-temperature ocean.
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CAN A BOAT BATTERY UPGRADE BE A DIY PROJECT?
Written by Hank George, Silver Sponsor, Blue Heron Batteries
Blue Heron offers SDSA Members a 10% discount - go to BlueHeronBattery.com
Lithium batteries have been on the market for nearly 20 years now. Beta-testing was done in those early years, over 10-thousand research papers and studies have been completed, and in particular, lithium iron phosphate (LiFePO4 or LFP for short) batteries have now become the standard for marine, RV and solar battery bank installations. Other types of Lithium-ion batteries with Cobalt and nickel constituents are less safe and have the potential for auto-ignition and explosion. So, with that body of knowledge and demonstrated safety, is it plausible to build one’s own battery bank and install the lithium batteries in one’s boat? I’ll try to touch on the relevant issues that question introduces. This article focuses on use of Lithium Iron Phosphate (LiFePO4) batteries.
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HAVE YOU CHECKED OUT THE PREDICTWIND LIGHTNING TRACKER FEATURE YET?
Written by Suellen Hurling, PredictWind
SDSA members receive a 20% rebate on forecast subscriptions, for a new purchase or a renewal within a month of purchase. Contact [email protected] with proof of SDSA membership.

If you haven’t explored the latest PredictWind innovation, now’s the time to get familiar with their brand-new real-time lightning tracker - a game-changing addition to their suite of weather forecasting tools, available to view now in the PredictWind app. Whether you’re a coastal cruiser, offshore adventurer, or weekend sailor, this new feature is all about keeping you safer and better informed out on the water. The PredictWind Lightning Tracker offers near-global lightning detection, utilising an advanced network of sensors spread across more than 100 countries from remote land masses to vast stretches of ocean.
But what makes this lightning tracker feature truly remarkable is its attention to detail. It doesn’t just show that lightning is happening - it gives you actionable insights. You’ll see whether a strike is cloud-to-cloud or cloud-to-ground, the peak current in kiloamperes (a measure of strike strength), and even the charge polarity. This is particularly important when you’re dealing with positive strikes, which are much stronger and more hazardous than negative ones. For sailors, this type of granular data can influence your route decisions, anchorage planning, and when to dash for shelter.
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MEET THE DAWGS: LORI AND DAN CARLSON

Boat name, length, type: SV BeBe Amel Super Maramu 53
Home Port: Well... the stern of the boat says St Thomas, VI but we have never lived there. That's where we bought and registered her. We actually live in Holland, Michigan
Where are you now? We are in Holland, Michigan
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INTRODUCING THE NEW SDSA APP!
Written by Michael Benjamin and Allen Roberts

We’re excited to announce the new members-only app, available on both iPhone and Android platforms. (Non-member rally crew may access the app for a limited time before, during and after each rally. SDSA membership is required for continued access.) The app combines many SDSA membership benefits in one easy-to-access program that includes the following:
- Messaging your fellow Dawgs (similar to WhatsApp),
- Posting information and photos (similar to Facebook),
- Membership directory,
- Member and rally tracking maps and
- Library of Zoom education recordings,
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