Author Topic: Barometer Calibration 201 How to use Windy.com for better calibration: ISOBARS  (Read 3657 times)

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Offline davidmc36

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Once settled at Hi Px today I saw the same as Lo Px before. Within a couple hundredths.

It will lead or lag while transitioning but never more than a tenth or so.

CYOW comes in handy and is always in confirmation of a couple hundredths. No METAR is shown for YCC or PL3.

Probably my air exchanger cycling makes the most error.  :lol:

Offline davidmc36

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Just now I sit 2 one hundredths of an inch higher than CYOW.
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Offline galfert

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Looks like a bad day to draw isobars.
Ecowitt GW1000 | Meteobridge on Raspberry Pi
WU: KFLWINTE111  |  PWSweather: KFLWINTE111
CWOP: FW3708  |  AWEKAS: 14814
Windy: pws-f075acbe
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Offline gszlag

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  • ..have you calibrated your barometer today?
    • Michael's Bay - Manitoulin Island weather
Just now I sit 2 one hundredths of an inch higher than CYOW.
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I too, also like to check out and compare the local METARs to see where I'm at from time-to-time.

Another thing to do with windy.com is to fast foward the time line into the future and see what the three forecast models are predicting - where the isobars are going and if pressure will be changing up or down ( by a little or by a lot) during the day.

What the pressure is at the moment is not all that important - it's the change in pressure that's important. If you see a big change in pressure then you will likely see a big change in weather. That's one of the best parts about watching the weather!
Ecowitt GW1000/GW1100
Ecowitt WS68: Anemometer, UV/solar
Ecowitt WH40: Rain gauge
Ecowitt WH32E: Outside T & H sensor
Ambient Weather WS-2000
Stratus Rain Gauge (manual)
Raspberry Pi 3B+ (WeeWX/CumulusMX)
Raspberry Pi Zero 2W WeeWX/MQTT/Belchertown)
---
http://weather.glenns.ca (pwsdashboard - live)
http://weewx.glenns.ca
http://glenns.ca/cumulusmx2/index.htm
---
WU: ITEHKUMM2
PWSweather.com: MBAYWX1
AWEKAS:id=15920
WINDY: Michael's Bay, Manitoulin Island
WOW: Michael's Bay

Offline CW2274

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Just now I sit 2 one hundredths of an inch higher than CYOW.
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What the pressure is at the moment is not all that important - it's the change in pressure that's important.
That's an over-simplification. Yes, change is important, but so is current pressure. Granted, an extreme, but for example, waking up to 28.28 inHg on the shore of Lake Erie in northern Ohio in January of 1978 and not seeing a car in the parking lot from hurricane force wind and snow was very important, just as the all time record low pressure for Ohio was.

Offline gszlag

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  • ..have you calibrated your barometer today?
    • Michael's Bay - Manitoulin Island weather
Just now I sit 2 one hundredths of an inch higher than CYOW.
 [ You are not allowed to view attachments ]
What the pressure is at the moment is not all that important - it's the change in pressure that's important.
That's an over-simplification. Yes, change is important, but so is current pressure. Granted, an extreme, but for example, waking up to 28.28 inHg on the shore of Lake Erie in northern Ohio in January of 1978 and not seeing a car in the parking lot from hurricane force wind and snow was very important, just as the all time record low pressure for Ohio was.

Yeah, we get a bit of snow on the north end of the Lakes too. In the winter of 2019, there were more people shoveling their roofs than their driveways.

Yup guilty as charged, as I was suffering from YABCT - YetAnotherBarometerCalibrationThread. Defintely guilty for adding a lot of text on that subject. Sometimes oversimplification eases the pain...Or we can buy Class A barometers and calibrate  the METARS :)
Ecowitt GW1000/GW1100
Ecowitt WS68: Anemometer, UV/solar
Ecowitt WH40: Rain gauge
Ecowitt WH32E: Outside T & H sensor
Ambient Weather WS-2000
Stratus Rain Gauge (manual)
Raspberry Pi 3B+ (WeeWX/CumulusMX)
Raspberry Pi Zero 2W WeeWX/MQTT/Belchertown)
---
http://weather.glenns.ca (pwsdashboard - live)
http://weewx.glenns.ca
http://glenns.ca/cumulusmx2/index.htm
---
WU: ITEHKUMM2
PWSweather.com: MBAYWX1
AWEKAS:id=15920
WINDY: Michael's Bay, Manitoulin Island
WOW: Michael's Bay

Offline CW2274

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    • Conditions @ CW2274 West Tucson-Painted Hills Ranch
Just now I sit 2 one hundredths of an inch higher than CYOW.
 [ You are not allowed to view attachments ]
What the pressure is at the moment is not all that important - it's the change in pressure that's important.
That's an over-simplification. Yes, change is important, but so is current pressure. Granted, an extreme, but for example, waking up to 28.28 inHg on the shore of Lake Erie in northern Ohio in January of 1978 and not seeing a car in the parking lot from hurricane force wind and snow was very important, just as the all time record low pressure for Ohio was.
Yup guilty as charged, as I was suffering from YABCT - YetAnotherBarometerCalibrationThread.
:-) Indeed. Reading all the hoops that must be jumped through for you folks makes me nuts...let alone all of you that deal with this, and that it is completely unnecessary. If I were to complain about improvements in your guys equipment, this would absolutely lead the way, hands down.