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. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion visit https://groups.google.com/d/msgid/weewx-user/9d6526d6-f513-42ea-8a14-84d8db88724cn%40googlegroups.com.
