Thanks On Friday, August 22, 2025 at 8:22:25 AM UTC-4 [email protected] wrote:
> EDIT: Sorry. I meant to say station pressure calculator not station > elevation calculator > You can use this station pressure calculator: > https://www.sensorsone.com/elevation-station-qfe-sea-level-qnh-pressure-calculator/?ab=1&v0=1865&f0=ft&f1=inHg0C&f2=inHg0C > > Note: This calculator uses aviation terms. QFE = station pressure and QNH > = altimeter setting. I've already entered in your elevation. All you have > to do is enter in the altimeter setting of your airport in the QNH input > field and the calculator will calculate your QFE (station pressure). > --- > > On Thursday, August 21, 2025 at 2:49:01 PM UTC-4 [email protected] wrote: > >> Given: >> >> Aug 20 6:35 pm >> >> Altitude (true) = 1865 ft >> WeeWX altitude = 70 ft >> WeeWX altimeter= 29.86 inHg (rounded)) >> WeeWX barometer = 29.85 inHg (rounded) >> WeeWX pressure = 29.78 inHg (rounded) >> >> NOTE: at altitude = 70 ft we are very close to sea level (altitude = 0). >> As mentioned in my previous post, all three pressures hypothetically, >> should be the same at sea level. We can see that clearly happening at the >> 70 ft altitude where the readings start getting closer together. >> >> Aug 20 18:35 (from mesowest): >> >> KPSK elevation = 2106 ft >> KPSK pressure = 27.74 >> KPSK altimeter = 29.95 >> >> EXAMPLE station elevation calculation: >> >> LaCrosse true altitude = 1865 ft >> KPSK altimeter= 29.95 inHg >> >> Solving for LaCrosse "pressure" = 27.99 inHg >> >> As reported LaCrosse "pressure" = 29.78 inHg >> >> It looks like your current pressure of 29.78 is much too high. >> >> In order to calculate altimeter, at a location with a 1865 ft altitude, >> your relative pressure on your console should always be reading 1.96 Hg >> higher than your current live absolute pressure ("pressure"). >> >> To re-calibrate your display console: >> >> 1. Calculate your station pressure (follow the example above) and then >> add 1.96 to this number to get your corrected relative pressure. Modify the >> existing relative pressure in your display console. >> 2. Your pressure is wrong and you will have to fix it. I was unable to >> find a way to modify your absolute pressure from your manual. You may have >> to contact LaCrosse and see how this may be done. >> 3. Alternatively, I believe there is a way to add a pressure calibration >> offset in the WeeWX config file. >> 4. Once you fixed your absolute pressure and relative pressure,, >> don'forget to put back your correct station altitude of 1865 ft. >> --- >> >> On Wednesday, August 20, 2025 at 7:11:02 PM UTC+4 kufuu wrote: >> >>> Correction , I have weewx set at 70ft elevation to try and match another >>> weather station, sorry about that. >>> >>> >>> On Wednesday, August 20, 2025 at 6:50:00 PM UTC-4 kufuu wrote: >>> >>>> Im about 15 miles away >>>> >>>> On Wednesday, August 20, 2025 at 6:47:42 PM UTC-4 kufuu wrote: >>>> >>>>> My actual elevation is 1865ft , weewx is set to 0 >>>>> >>>>> Using configuration file /etc/weewx/weewx.conf >>>>> REC: 2025-08-20 18:35:00 EDT (1755729300) 'altimeter': >>>>> '29.856197863702114', 'appTemp': '84.16620032955495', 'barometer': >>>>> '29.850973617639387', 'cloudbase': '1750.7310847902036', 'dateTime': >>>>> '1755729300', 'dewpoint': '69.42478322692313', 'ET': 'None', 'heatindex': >>>>> '77.86800000000002', 'humidex': '91.66911741879971', 'inDewpoint': >>>>> '56.232061622715676', 'inHumidity': '56', 'inTemp': '72.86000000000001', >>>>> 'interval': '5', 'maxSolarRad': '192.36417227192797', 'outHumidity': >>>>> '78', >>>>> 'outTemp': '76.82000000000002', 'pressure': '29.778039395', 'rain': >>>>> '0.0', >>>>> 'rainRate': '0.0', 'usUnits': '1', 'windchill': '76.82000000000002', >>>>> 'windDir': 'None', 'windGust': '0.0', 'windGustDir': 'None', 'windrun': >>>>> '0.0', 'windSpeed': '0.0' >>>>> >>>>> LOOP: 2025-08-20 18:35:44 EDT (1755729344) 'altimeter': >>>>> '29.856197863702114', 'appTemp': '84.16620032955495', 'barometer': >>>>> '29.850973617639387', 'cloudbase': '1750.7310847902036', 'dateTime': >>>>> '1755729344', 'dewpoint': '69.42478322692313', 'ET': 'None', 'heatindex': >>>>> '77.86800000000002', 'humidex': '91.66911741879971', 'inDewpoint': >>>>> '56.232061622715676', 'inHumidity': '56', 'inTemp': '72.86000000000001', >>>>> 'inTempBatteryStatus': '0', 'maxSolarRad': '189.6877965534115', >>>>> 'outHumidity': '78', 'outTemp': '76.82000000000002', >>>>> 'outTempBatteryStatus': '0', 'pressure': '29.778039395', 'rain': 'None', >>>>> 'rainBatteryStatus': '0', 'rainRate': '0.0', 'rxCheckPercent': '100', >>>>> 'usUnits': '1', 'windBatteryStatus': '0', 'windchill': >>>>> '76.82000000000002', >>>>> 'windDir': 'None', 'windGust': '0.0', 'windGustDir': 'None', 'windrun': >>>>> 'None', 'windSpeed': '0.0' >>>>> >>>>> KPSK dublin VA >>>>> >>>>> >>>>> *Current conditions at* Dublin / New River Valley (KPSK) *Lat: * >>>>> 37.13°N*Lon: *80.68°W*Elev: *2106ft. >>>>> >>>>> Mostly Cloudy >>>>> >>>>> 76°F >>>>> >>>>> 24°C >>>>> >>>>> *Humidity* >>>>> 76% >>>>> *Wind Speed* >>>>> E 7 mph >>>>> *Barometer* >>>>> 29.95 in >>>>> *Dewpoint* >>>>> 68°F (20°C) >>>>> *Visibility* >>>>> 10.00 mi >>>>> *Heat Index* >>>>> 77°F (25°C) >>>>> *Last update* >>>>> 20 Aug 6:35 pm EDT >>>>> >>>>> *More Information:* >>>>> >>>>> Local Forecast Office <https://www.weather.gov/rnk>More Local Wx >>>>> <http://forecast.weather.gov/obslocal.php?warnzone=VAZ013&local_place=2%20Miles%20N%20Dublin%20VA&zoneid=EDT&offset=14400>3 >>>>> >>>>> Day History <http://forecast.weather.gov/data/obhistory/KPSK.html>Hourly >>>>> Weather Forecast >>>>> <https://forecast.weather.gov/MapClick.php?lat=37.1333&lon=-80.6833&unit=0&lg=english&FcstType=graphical> >>>>> >>>>> >>>>> >>>>> On Wednesday, August 20, 2025 at 6:00:53 PM UTC-4 [email protected] >>>>> wrote: >>>>> >>>>>> The three pressures on your LOOP was "altimeter", "barometer" and >>>>>> "pressure". >>>>>> If you set station altitude = 0 then you are telling your weather >>>>>> station's barometer that it is located at sea level. >>>>>> Therefore all three pressures shouldl read the same. >>>>>> >>>>>> "pressure" is just your local atmospheric pressure at your location's >>>>>> altitude.. >>>>>> "altimeter" is a sea level pressure that factors in your altitude >>>>>> above sea level and "corrects" your local pressure (station pressure) >>>>>> and >>>>>> calculates an equivalent pressure at sea level. >>>>>> "barometer" is also a sea level pressure except it factors in your >>>>>> station pressure "(pressure" in WeeWX) , local temperature and humidity >>>>>> and "corrects" it to an equivalent pressure at sea level. >>>>>> >>>>>> I took a quick look at your weather station's manual and it appears >>>>>> that your display console reads "relative pressure" only. So in your >>>>>> case >>>>>> if you set station altitude = 0 in WeeWX, WeeWX's SLP correction will >>>>>> calculate a correction = 0. It makes sense because you told WeeWX you >>>>>> are >>>>>> located at sea level so there is no need to correct your "pressure" to >>>>>> sea >>>>>> level - you are already at sea level! Therefore "pressure" = "barometer" >>>>>> at >>>>>> sea level ( altitude = 0). >>>>>> >>>>>> I am not familiar with LaCrosse barometer operations- but I'll try to >>>>>> help. Other LaCrosse owners can certainly jump in... >>>>>> >>>>>> Things to check. >>>>>> >>>>>> 1. What have you entered as your station altitude in WeeWX? Did you >>>>>> ensure that the station altitude you entered in WeeWX is the altitude of >>>>>> the barometric sensor (total height above sea level?) How did you >>>>>> calculate >>>>>> your station altitude? >>>>>> >>>>>> 2. Your weather station manual makes no mention of sea level pressure >>>>>> calculations, entering an altitude or elevation in your display >>>>>> console.or >>>>>> using an offset. The manual implies that the console only displays >>>>>> relative >>>>>> pressure? Can you confirm that? >>>>>> >>>>>> 3. How close are you to an official weather station at an airport? >>>>>> Can you provide the ICAO code for it? Or the name of the airport? >>>>>> >>>>>> 4. Your July 31 LOOP altimeter and barometer readings appear to be >>>>>> unseasonably high for typical summertime weather. >>>>>> >>>>>> 5. WeeWX is calculating altimeter correctly but WeeWX barometer >>>>>> seems high compared to the Starpath online SLP calculator using the same >>>>>> input parameters. WeeWX "barometer" should be close to be the same or >>>>>> less >>>>>> than "altimeter" at the temperatures you reported. >>>>>> >>>>>> 6. Does your weather station use PC software from the manufacturer? >>>>>> If so, what is it reporting currently for absolute pressure and relative >>>>>> pressure? Can you adjust your absolute pressure? >>>>>> >>>>>> 7. Can you do another LOOP and give us the three pressures >>>>>> (altimeter, barometer, and pressure)? >>>>>> >>>>>> At the same time you do a LOOP ,can you obtain the altimeter setting >>>>>> of a close-by airport. And finally, can you obtain the elevation of that >>>>>> airport. >>>>>> >>>>>> Summing up, we need: your station altitude, your weather station's >>>>>> absolute pressure, relative pressure and the current WeeWX LOOP pressure >>>>>> values (altimeter, barometer, and pressure) and the LOOP outside >>>>>> temperature. In order to make some pressure comparisons and accuracy >>>>>> checks. We would also need , the name(s) of any close-by airport(s) and >>>>>> how >>>>>> close you are to these airports. lus we need the airport altimeter >>>>>> setting >>>>>> reading and elevation. As Tom mentioned in the wiki, you have to be >>>>>> careful >>>>>> about comparing your relative pressure on your display console with the >>>>>> WeeWX "barometer" calculation. They could be two different things. >>>>>> >>>>>> Michael's advice is I think, correct. You probably need to >>>>>> re-calibrate or at least verify if your station pressure/absolute value >>>>>> is >>>>>> accurate. >>>>>> >>>>>> On Wednesday, August 20, 2025 at 1:33:38 AM UTC+4 [email protected] >>>>>> wrote: >>>>>> >>>>>>> >>>>>>> Which obs_type "reads what is on the display", when altitude is set >>>>>>> to 0? pressure, altimeter or barometer or all three? (It should be all >>>>>>> three) When setting your altitude, pressure should always "read what is >>>>>>> on >>>>>>> the display", altimeter and barometer will change with the altitude you >>>>>>> configure. >>>>>>> >>>>>>> You should calibrate your station to the real pressure provided by a >>>>>>> reliable station near you, which is located at the same altitude. Then >>>>>>> configure the altitude of the station in weewx, then choose the >>>>>>> obs_types >>>>>>> you want to have displayed in your report. Depending on what you >>>>>>> choose, >>>>>>> the may or may not "read what is on the display", which is perfectly >>>>>>> fine >>>>>>> for altimeter and barometer. >>>>>>> kufuu schrieb am Dienstag, 19. August 2025 um 21:09:21 UTC+2: >>>>>>> >>>>>>>> If I put 0 altitude in weewx config then it reads what is on the >>>>>>>> display, is there any way to correct or just leave it 0 ? >>>>>>>> >>>>>>>> On Thursday, July 31, 2025 at 9:29:40 AM UTC-4 kufuu wrote: >>>>>>>> >>>>>>>>> It can wait till then and good luck, >>>>>>>>> >>>>>>>>> On Thursday, July 31, 2025 at 9:06:30 AM UTC-4 kufuu wrote: >>>>>>>>> >>>>>>>>>> Let me redo this and put the dates in order, >>>>>>>>>> LOOP: 2025-07-31 08:45:20 EDT (1753965920) 'altimeter': >>>>>>>>>> '31.994965595814566', 'appTemp': '82.83203424777768', 'barometer': >>>>>>>>>> '31.942483641883886', 'cloudbase': '2805.6732703464695', 'dateTime': >>>>>>>>>> '1753965920', 'dewpoint': '70.70103761047554', 'ET': 'None', >>>>>>>>>> 'heatindex': >>>>>>>>>> '76.113', 'humidex': '90.81599237942409', 'inDewpoint': >>>>>>>>>> '55.52280883736111', 'inHumidity': '58', 'inTemp': '71.06', >>>>>>>>>> 'inTempBatteryStatus': '0', 'maxSolarRad': '357.687499228319', >>>>>>>>>> 'outHumidity': '87', 'outTemp': '74.84', 'outTempBatteryStatus': >>>>>>>>>> '0', >>>>>>>>>> 'pressure': '29.919783335', 'rain': '0.0', 'rainBatteryStatus': '0', >>>>>>>>>> 'rainRate': '0.0', 'rxCheckPercent': '100', 'usUnits': '1', >>>>>>>>>> 'windBatteryStatus': '0', 'windchill': '74.84', 'windDir': 'None', >>>>>>>>>> 'windGust': '0.0', 'windGustDir': 'None', 'windrun': 'None', >>>>>>>>>> 'windSpeed': >>>>>>>>>> '0.0' >>>>>>>>>> REC: 2025-07-31 08:45:00 EDT (1753965900) 'altimeter': >>>>>>>>>> '31.994965595814566', 'appTemp': '82.83203424777768', 'barometer': >>>>>>>>>> '31.942483641883886', 'cloudbase': '2805.6732703464695', 'dateTime': >>>>>>>>>> '1753965900', 'dewpoint': '70.70103761047554', 'ET': 'None', >>>>>>>>>> 'heatindex': >>>>>>>>>> '76.113', 'humidex': '90.81599237942409', 'inDewpoint': >>>>>>>>>> '55.52280883736111', 'inHumidity': '58.0', 'inTemp': '71.06', >>>>>>>>>> 'inTempBatteryStatus': '0.0', 'interval': '5.0', 'maxSolarRad': >>>>>>>>>> '351.7781598061274', 'outHumidity': '87.0', 'outTemp': '74.84', >>>>>>>>>> 'outTempBatteryStatus': '0.0', 'pressure': '29.919783335', 'rain': >>>>>>>>>> '0.0', >>>>>>>>>> 'rainBatteryStatus': '0.0', 'rainRate': '0.0', 'rxCheckPercent': >>>>>>>>>> '97.5', >>>>>>>>>> 'usUnits': '1', 'windBatteryStatus': '0.0', 'windchill': '74.84', >>>>>>>>>> 'windDir': 'None', 'windGust': '0.0', 'windGustDir': 'None', >>>>>>>>>> 'windrun': >>>>>>>>>> '0.0', 'windSpeed': '0.0' >>>>>>>>>> Traceback (most recent call last): >>>>>>>>>> File "/usr/share/weewx/weewx/reportengine.py", line 248, in run >>>>>>>>>> obj.start() >>>>>>>>>> File "/usr/share/weewx/weewx/reportengine.py", line 465, in >>>>>>>>>> start >>>>>>>>>> self.run() >>>>>>>>>> File "/usr/share/weewx/weewx/reportengine.py", line 621, in run >>>>>>>>>> ncopy += weeutil.weeutil.deep_copy_path(path, html_dest_dir) >>>>>>>>>> File "/usr/share/weewx/weeutil/weeutil.py", line 1811, in >>>>>>>>>> deep_copy_path >>>>>>>>>> shutil.copy(path, d) >>>>>>>>>> File "/usr/lib/python3.9/shutil.py", line 418, in copy >>>>>>>>>> copyfile(src, dst, follow_symlinks=follow_symlinks) >>>>>>>>>> File "/usr/lib/python3.9/shutil.py", line 264, in copyfile >>>>>>>>>> with open(src, 'rb') as fsrc, open(dst, 'wb') as fdst: >>>>>>>>>> PermissionError: [Errno 13] Permission denied: >>>>>>>>>> '/var/www/html/weewx/seasons.css' >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> -- You received this message because you are subscribed to the Google Groups "weewx-user" group. 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