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Tropical Weather / Re: Hurricane Season 2017
« Last post by ValentineWeather on Today at 12:25:31 AM »
WOW! I'll be getting direct reports most of family is now living suburbs of Houston.
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Tropical Weather / Re: Hurricane Season 2017
« Last post by Farmtalk on Yesterday at 10:43:40 PM »
The WPC is showing roughly 10-15" as a forecast right now. The GFS is showing much higher, and boy, I hope it is wrong for you all in eastern Texas. Hopefully Harvey gets off the brakes when it makes landfall.

I got wiped out with about 8" of rain in a valley (That's a 250 year flood for us). I can't imagine what 40" of rain would be like.
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I also performed some tipping bucket rain sensor tests.  Three 8oz volumes were poured thru the sensor at various installation angles, all deviating from two-plane level by under 5*.

Suffice it to say, there is a large measurement error along the bucket axis and a much smaller one transversely.  Some effort should be made to ensure the sensor is level, mine has a built-in bubble level and if the center of the sight glass is entirely within the bubble, your errors will be small, if not undetectable.

As the edge of the bubble gets closer to the red ring, the measurement error goes up quickly!

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I whipped up a couple hand-drawn diagrams of the intended system.

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Tropical Weather / Re: Hurricane Season 2017
« Last post by dupreezd on Yesterday at 09:15:59 PM »
@Ocala, I see you are also getting lots of rain there in Florida.
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Tropical Weather / Re: Hurricane Season 2017
« Last post by ocala on Yesterday at 08:07:37 PM »
That storm has the potential to do some real damage.
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I put an RMY 05103 on my workbench connected to a calibrator.  I'm turning the speed shaft at various speeds.
The H11A1 has a single led for DC input while the H11AA1 has dual leds for AC input.  I didn't connect an optoisolator to the RMY 05103.   
I haven't converted to MPH but at 3 wind (shaft) speeds, the generator output is #1 336mv @ 10HZ, #2 600mv @ 21HZ; and #3 highest speed 2.28 volts @ 86HZ.  The generator produces three cycles per revolution (1RPM=3HZ)(1MPH=0.01096RPM)
This means that at very low wind speeds, the generator doesn't produce an output voltage high enough to drive the H11AA1 leds.  Using an optoisolator, the wind measured threshold will be several MPH (no output) even with the impeller rotating.
I believe that I'll have to stick with my design using op-amps to amplify and square up the generator output.  I'll get back to that old circuit soon.
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AcuRite Weather Stations / Re: Atlas on Amazon
« Last post by Chief_10Beers on Yesterday at 07:35:53 PM »
Acurite Deleted the Amazon Post at Acurite Forums but Amazon still shows the Atlas Elite at $599, but this will disappear pretty soon too...............
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Tropical Weather / Re: Hurricane Season 2017
« Last post by SoMDWx on Yesterday at 07:23:17 PM »
Stay Safe!
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Tropical Weather / Re: Hurricane Season 2017
« Last post by dupreezd on Yesterday at 06:53:05 PM »
Looks like my home town (Houston) might be in for a rough weekend with Harvey. I am located 30 miles north downtown.
We got flooded out with Allison but moved to 'much' higher ground after that. Will keep you posted.
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