WXforum.net
Weather Related Organizations => CWOP Forum => Topic started by: danoh on March 16, 2020, 10:55:55 AM
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Hey all,
I'd like to share the word on a new web-based service I have created.
If you have an Ambient Weather station that is sending to ambientweather.net, and would like to upload your weather observations to CWOP, check it out.
https://ambientcwop.com (https://ambientcwop.com)
This website/service is not affiliated with Ambient Weather or Nielsen-Kellerman
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day 2 , cant login
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I'll have a password reset method soon.
I replied to your email with a temporary password.
Sorry you forgot your password.
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Hi I am currently trying to reset my password or even login but there is no tab. My e-mail is adrlnr@yahoo.com and my registration number is EW8834 from another station I had a few years back which I want to reuse with another station. Please help I can’t login in. This site has no login option.
https://ambientcwop.com/cwop-letter-to-station-owners.php?s=1
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Hi I am currently trying to reset my password or even login but there is no tab. My e-mail is adrlnr@yahoo.com and my registration number is EW8834 from another station I had a few years back which I want to reuse with another station. Please help I can’t login in. This site has no login option.
https://ambientcwop.com/cwop-letter-to-station-owners.php?s=1
So you're saying there's not a "login" button at the top? The one right next to the "signup" button?
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Hi I am currently trying to reset my password or even login but there is no tab. My e-mail is adrlnr@yahoo.com and my registration number is EW8834 from another station I had a few years back which I want to reuse with another station. Please help I can’t login in. This site has no login option.
https://ambientcwop.com/cwop-letter-to-station-owners.php?s=1
So you're saying there's not a "login" button at the top? The one right next to the "signup" button?
When I try to login with the old account it won’t let me. I tried to resend an email to reset my password but it never comes. My registration ID is EW8834. If you try to create another account with a different email address yes there is no login option then.
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So you have signed up on ambientcwop.com before?
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Hi I am currently trying to reset my password or even login but there is no tab. My e-mail is adrlnr@yahoo.com and my registration number is EW8834 from another station I had a few years back which I want to reuse with another station. Please help I can’t login in. This site has no login option.
https://ambientcwop.com/cwop-letter-to-station-owners.php?s=1
So you're saying there's not a "login" button at the top? The one right next to the "signup" button?
When I try to login with the old account it won’t let me. I tried to resend an email to reset my password but it never comes. My registration ID is EW8834.
You don't have an old account on AmbientCWOP.com. Your EW8834 is from over 3 years ago before AmbientCWOP.com existed.
- You need to create a new account for AmbientCWOP.com...this has nothing to do with EW8834.
- There is no password to reset for AmbientCWOP.com as this is a new service that has only existed for about a month.
- Uploading to CWOP does not require a password. But if you use the AmbientCWOP.com website then you need an account for that.
- AmbientCWOP.com and CWOP are two different things. AmbientCWOP.com is just a helper website to pull data from Ambientweather.net and upload it for you to CWOP for those that do not have any other means to upload to CWOP.
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He was just really confused. See the thread on FB. ](*,)
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Yeah, just saw FB.
Makes me wonder if perhaps AmbientCWOP.com should add to the description of what it is and that it is not CWOP itself. I've corrected the following section. Feel free to use this as a guide or suggestion.
What is AmbientCWOP?
If you have a weather station that reports to AmbientWeather.net you can sign up here to use this AmbientCWOP website service to upload your weather observations to CWOP. This website service is not CWOP itself, rather it is just a helper service to get your weather data uploaded to the CWOP APRS network. We recommend that you first have a CWOP ID before signing up for your AmbientCWOP.com account.
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Update: If you are an amateur radio operator, and use your callsign as your CWOPID, your weather data will now appear on APRS-IS as well.
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danoh:
First, I'm really glad that you've started this service, and I hope that it all goes well. I just signed up with it, got my CWOP number, and starting sending data.
One thing about the signup process, though. The "you gotta read this and accept before continuing" button is easy to overlook if you're not reading ahead before trying to fill out the form. :grin:
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danoh:
First, I'm really glad that you've started this service, and I hope that it all goes well. I just signed up with it, got my CWOP number, and starting sending data.
One thing about the signup process, though. The "you gotta read this and accept before continuing" button is easy to overlook if you're not reading ahead before trying to fill out the form. :grin:
You shouldn't be able to even fill out the form until you click and agree. What browser are you using? Those fields are disabled until you click that and agree.
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That's how it worked for me. I just didn't read the "read this" button, and tried to enter data in with three different browsers before I slowed down enough to actually read the "you gotta do this before you can register" stuff.
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That's how it worked for me. I just didn't read the "read this" button, and tried to enter data in with three different browsers before I slowed down enough to actually read the "you gotta do this before you can register" stuff.
Oh I understand now. Yeah I'll move that upwards to a more conspicuous spot on the signup form.
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Just letting you know I'm back on the air as of this evening. Got back a new Weather Station that appears to emit correct data this time.
Walt / WB4ZUT
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Just letting you know I'm back on the air as of this evening. Got back a new Weather Station that appears to emit correct data this time.
Walt / WB4ZUT
If you haven't done so already you need to send an email to CWOP-support at noaa.gov to mention that you would like to become active again. You are currently inactive:
http://wxqa.com/sss/search1.cgi?keyword=WB4ZUT
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What is the proper email to let them know?
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OK, I see the email address now...didn't see the "@" symbol at first. I sent email. Thank you for letting me know.
Walt/WB4ZUT
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Danoh, thank you so much for this site. I signed up and within 20 minutes I’m up and running on CWOP! So grateful to you for making it so easy.
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CindiA,
Welcome to the forum. Your barometer is not calibrated. Take a look at KLCK and KTZR.
https://aviationweather.gov/metar/data?ids=KLCK&format=decoded&date=&hours=0
https://aviationweather.gov/metar/data?ids=KTZR&format=decoded&date=&hours=0
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Thanks for letting me know. I think I finally got it calibrated to KLCK, which is a few miles from us.
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CindiA,
It still isn't right. You are probably looking at your Relative pressure on your display console and that may match. But for CWOP your Relative pressure is not what is used. When sending data to CWOP what is used is your Absolute pressure in conjuction with your elevation. Therefore it is important that you have set things up correctly with Absolute pressure and your elevation.
Step 1
First is to determine your elevation. I like to use the following website to determine elevation.
https://www.freemaptools.com/elevation-finder.htm
Using that website your elevation is 236 meters. We need to use the metric system for better results. This goes not just for elevation but also for barometric pressure. Your console will be more precise while using metric barometric pressure which is measured in hPa. After calibration if you prefer to see inHg units you can switch back and all calibration settings will stay. So, calibrate with metric and then switch back to Imperial units if you prefer.
We then take the 236 meters and I'm going to add 1 meter to that to account for the fact that your barometric sensor is at least 1 meter off the ground. It is inside of your display console in the WS-2902. You can make adjustments to my estimates if you prefer.
Your total barometric sensor elevation of 237 is entered into the following online calculator to figure out what the difference between your Relative pressure and Absolute pressure should be. Do not change the standad temperature of 15°C nor the standard pressure of 1013.25 hPa as these are required numbers to get a good mean value for your offset.
https://keisan.casio.com/exec/system/1224579725
After entering just the 237 meters into the Keisan Casio calculator we hit the execute button and the results show atmospheric pressure of 985.24 hPa. We then subtract that number the standard pressure which is 1013.25.
1013.25 - 985.24 = 28.01
standard pressure (1013.25) - the calculated standard absolute pressure for your elevation = the offset or difference between both pressures.
We have now caluclated that 28.0 hPa is the barometric offset between Relative Pressure and Absolute Pressure. What this means is that 28.0 hPa is by how much your Relative and Absolute pressure will differ....always! I recommend switching your console to show hPa for pressure to enter this difference in. Don't worry about how much it will mess up your Relative pressure. We will fix that in the next step. What is important is that Whatever shows for Relative Pressure is exactly 28.0 hPa from whatever it shows is Absolute pressure. Essentially we are now giving the display console the information that it needs because 28.0 hPa is indicative of 237 meters of elevation.
That concludes Step 1...which is essentially entering in this offset which tells the console what your elevation is.
Step 2
Now for Step 2 you look to see what is shown for Relative pressure on your display console. You compare that to your local METAR KLCK and/or KTZR. The METAR shows hPa also...so that keeps it in metric..which is good. Before you touch your console again though....all you need to know is how much off you are. If you are say 1.2 hPa too high (just an example as I don't know yet how much you will be off). Then you will not touch the Relative pressure. What you have to do for this last step is to add or remove from the Absolute to affect that amount of change in the Relative pressure. Because we want to maintain the 28.0 hPa offset....so we can never ever touch Relative pressure directly. You must calibrate to the METAR only using the Absolute pressure now that the offset is set.
The bottom line is that CWOP uses your Absolute pressure and that with your elevation is used to calculate Altimeter pressure. This is something that the 3rd party AmbientCWOP site software does and that is what it sends to CWOP.
That concludes Step 2....which is to only touch Absolute pressure to cause the Relative Pressure to move by that amount until Relative Pressure matches the METAR.
When all this is said and done you can keep using the hPa units....or switch back to inHg if you prefer....it won't mess anything up. The biggest reasons for having done all the calibration steps with metric is because of a few reasons; the console internally natively is using metric (less conversions the better), the online calculators are metric, and most importantly the console's precision is more when using metric because you can adjust barometric pressure by 0.1 hPa which is 0.003 inHg and that is a level of precision that you can not adjust when using inHg....as using inHg during calibration only lets you go up or down by 0.01 inHg. Which means that using inHg if you go ±0.01 inHg then you are not being as precise as you could be....which makes it so that at times you could be off by a full 0.01 inHg due to conversion rounding. The console will track barometric pressure much nicer if you calibrate using the higher precision of hPa. This doesn't mean that hPa is better in every case for everyone. If our consoles allowed you to calibrate to 3 decimal places with inHg then that would have more precision. Some people will say that it doesn't matter because of the accuracy error limitations of the sensor....but in my experience the accuracy of the sensors is understated and for all the other reasons it is better to use the internal units for calibration because regardless error is introduced every time you convert units....so limit the number of conversions.
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Thank you for that incredible description, galfert! I’m going to re-read this about 5 times and then try to recalibrate again. I’ll let you know when I’ve done it. You’re amazing. Just sayin’.
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My husband and I are working this out now, but I won’t be putting the info in until tomorrow because we’re in the middle of rain right now. However, a couple of questions:
1. My weather station is 9 ft above ground. So we’ve got a total elevation of 238.75, which comes to a difference off 28.21. This is the difference I need to change in the Absolute pressure, correct?
2. You say the METAR for the airport shows in hPa, but I’m only seeing Hg and mb for pressure. Am I using the Hg?
Thanks for being patient with me. This is a learning experience!
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My husband and I are working this out now, but I won’t be putting the info in until tomorrow because we’re in the middle of rain right now.
You don't have to wait for rain to make a preliminary adjustment. My instructions are broken down into two major steps. Step 1 has nothing to do with current conditions. Step 1 is only about giving your station your elevation by way of this offset that gets set. This will never change. From then on Step 2 is about fine tuning your calibration. You can do Step 2 today even with rain and then fine tune it further when weather conditions are more ideal.
1. My weather station is 9 ft above ground. So we’ve got a total elevation of 238.75, which comes to a difference off 28.21. This is the difference I need to change in the Absolute pressure, correct?
The elevation of your weather station outdoor sensors does not come into account when calibrating the barometer, because there is no barometer within the outside sensors. Your barometric sensor is actually inside of the display console. It is the total elevation of your display console that you need to take into account. Most importantly notice it will be considerably different if your display console is upstairs on a 2nd floor. You must take this total elevation into account.
When you registered your CWOP station you needed to provide them with your station's elevation. But again ...what they are asking is for the elevation of your barometric sensor! If you need to make a registration correction with CWOP you can email cwop-support <at> noaa.gov. After your station get ingested into MADIS you might want to also check out your station on MesoWest and see if they have the updated elevation...if not then send them an email too with the correction, atmos-mesowest <at> lists.utah.edu
But remember when you email cwop-support you reference your station by its FindU ID FWxxxx and when you email MesoWest you reference your station with Fxxxx for the ID (notice no W in the MADIS ID).
2. You say the METAR for the airport shows in hPa, but I’m only seeing Hg and mb for pressure. Am I using the Hg?
mb or millibar is the same thing as hPa (hectoPascal).
Another way to see this is that 1 millibar is 100 Pascal. In metric when you move the decimal place to the left two times from the base unit you end up with hecto (first deca then hecto....a third time would result in kilo). In Canada kPa are often the units used.
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Galfert, after a call to Ambient I was finally able to calibirate my 2902C. I think I calibrated in the right direction. Can you check it to make sure all is well with the absolute? I’m not going to do the relative until I know the absolute is correct. The help desk at Ambient is the BEST!
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I can't see your Absolute pressure.
Just post both your Relative and your Absolute pressures that you see in your display console. It doesn't matter when you take this reading.
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The key thing through this process is to understand the following.
Step 1: Sets your elevation. You do this by adjusting the Relative pressure only. You make the Relative pressure be greater than the Absolute by a given amount that corresponds to your elevation.*
Once you have entered in this offset, you never ever directly touch the Relative pressure again. Never. If your Relative pressure is wrong after having set this elevation offset in, then that is fixed in Step 2.
Step 2: Does the actual calibration of the barometer. You do this by only touching and adjusting the Absolute pressure. But you all the while are looking at how it ends up affecting your Relative pressure. Move the Absolute pressure up and the Relative will go up by the same amount. Move the Absolute pressure down and the Relative will go down by the same amount. Therefore realize that the difference between Relative and Absolute will stay the same....because that was set in Step 1.
* Relative pressure will always be greater than the Absolute pressure for all locations above sea level. For the few locations on Earth that are below sea level then the opposite is true.
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One other tip....Relative Pressure in your console is not the same as Altimeter pressure.
Some METAR report both Altimeter and Sea Level pressures. If your METAR only reports Altimeter then you are going to want to be sure that your resulting Altimeter calculation (what you see in CWOP) is what matches the METAR.
Therefore Step 2 gets a bit complicated until you realize that your console is doing one thing...but the CWOP software (AmbientCWOP.com in this case) is doing another thing.
But let's worry about Step 2 in a bit.
The first thing you need to do is confirm that you have completed Step 1. What is the difference between your Relative and your Absolute Pressure (on your display console)?
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OK, I’ve got:
990.1 - Absolute Pressure
1018.3 - Relative Pressure
I sincerely appreciate you being patient with me.
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Okay all looks good. You got it.
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Glory Hallelujah! Once you said in your first reply to me today that I had to set the Relative Pressure first it all came together and made sense! That just wasn’t clear to me in the first set of instructions you sent, lol. Now I’m off to write out the instructions in “Cindi-speak” so I can do this all over again when we move in a few years...
Again, forever grateful for your instructions, knowledge and patience with me.