MesoWest Information for PG186 in Penon Blanco, CA, United States Of America (site inactive)

The following information is known about PG186. If you think that any information is incorrect, then please follow the instructions for correcting that data item.

It is possible that this page will report a problem where no problem exists. If you believe that this has happened, then please contact me (address at the bottom of this page) and explain clearly why you think this page is in error. Note that any changes that you make may take a few days to show up here, so please give it a week before commenting.

For development purposes only
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For development purposes only
Sorry, we have no imagery here.
For development purposes only
Sorry, we have no imagery here.
For development purposes only
Sorry, we have no imagery here.
PG186
FW2000
GW0871
FW8380
DW1155
K6PDT
NM6G
DW4246
CW9085
FW9150
CW1522
GW4205
FW0864
GW1235
GW2994
EW8204
EW4850
FW9226
DW7479
EW1869
DW7171
GW5235
WA5KWK
WX6HNX-2
EW5766
DW9396
N6MDS
DW2149
GW1393
FW5661
N6LED-13
FW6330
CW4253
CW6459
N6XE
CW9148
DW8205
KN6IKM
FW0579
KI6IKQ
FW7364
CW0136
CW2060
K7FED
FW1340
FW2692
DW8427
DW6283
GW0187
GW3580
FW2761
DW3347
FW1750
EW3821
CW6601
DW1297
DW5868
EW8856
DW0946
FW5276
K6NC
EW7937
FW0443
FW9304
FW9934
FW7603
CW5121
EW5633
EW4543
K6MLE
CW6129
KN6DHD
CW6620
FW9070
FW7005
EW4496
EW5691
KJ6MC
DW4464
CW0443
DW7401
CW4719
FW5459
GW2334
DW7413
KD7ECD
EW4740
GW2871
EW3758
FW7537
EW8331
DW3588
KI6PPU
EW7549
DW9278
EW9135
GW5949
N6OIM
KQ7A
CW9927
GW5813
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Registered Location

Latitude: 37° 43' 56" N (deg min sec), 37.7321° (decimal), 3743.93N (LORAN)
Longitude: 120° 15' 44" W (deg min sec), -120.2623° (decimal), 12015.74W (LORAN)
Elevation: 846 metres (2775 feet) -- validated against 847 metres (2779 feet) from Geonames
Location: Penon Blanco, CA, United States Of America
County: Mariposa, CA
Data provider: PGE
Forecast Office: San Joaquin Valley (HNX)

The site location should be at the mark shown -- or very close. Clicking within the map area (or you can drag the 'PG186' marker) will display the latitude/longitude of that point.

If the displayed location (or elevation) of the weather observing location is incorrect, please drag the marker to the right location (or click in the right location), and then send the updated information. Please note that we are trying to spot either the Stevenson Screen (or equivalent) or the location where the barometric readings are taken.

Can you help with location quality? Please indicate if the marker on the map points at the weather instrument cluster:

The location information for this site was gathered from 1 data source. The source which most closely matches the consensus is chosen. Many of these sources only report the location to the nearest minute (or hundredth of degree). This can lead to the marker being placed noticeably incorrectly. Please see Discussion of Location Errors for more information.

There are no photographs of the station. If you have pictures of this location, then please email them to pg186@photo.gladstonefamily.net.

You can try to find photographs from the area surrounding the site marker by clicking on Find nearby photographs. (There may be some)

Data Status

Over the last 28 days, no data was seen on the following dates: 2025-02-17 to 2025-02-20, 2025-03-03 to 2025-03-14.

Recent observations from this weather station can be downloaded as a CSV file suitable for importing into various spreadsheet programs: last 7 days, last 14 days, last 28 days, last 56 days. This data can also be linked directly from Excel using a Web Query. The main link goes to the page with the data on it, and the IQY link is the Web Query that will access it: last 7 days (IQY: last 7 days), last 14 days (IQY: last 14 days), last 28 days (IQY: last 28 days), last 56 days (IQY: last 56 days).

All the means and standard deviations shown below are from the last 28 days. Change analysis period to Last 3 days  Last 7 days  Last 14 days  Last 8 weeks  Last 13 weeks  Last 26 weeks  Last 39 weeks  Last 52 weeks  

Temperature

  24 hours  Day time  Night time
Average temperature error-4.1 °F-0.4 °F-6.8 °F
Error standard deviation4.4 °F3.1 °F3.2 °F
Worst average temperature error-5.7 °F-2.1 °F-11.1 °F
Worst standard deviation6.1 °F3.6 °F3.8 °F

NOTE: If the error above is POSITIVE, then it means that the analysis temperature is HIGHER than the reported temperature. This means that your sensor is reading COLDER than expected.

 
 
MADIS
rating
MADIS rating 68% QC OK
Sensor fails following checks:
L2 Internal Consistency
L3 Spatial Consistency
 

Latest daily graph:

Latest daily graph

It appears that your station is sited near the edge of a large urban area. This causes the analysis values to be lowered than expected as the quality control system does not take the location of the urban area into account.

Dewpoint -- or switch to Relative Humidity

  24 hours  Day time  Night time
Average dewpoint error0.6 °F-0.2 °F1.2 °F
Error standard deviation4.5 °F3.0 °F5.4 °F
Worst average dewpoint error-3.7 °F-3.7 °F5.7 °F
Worst standard deviation5.5 °F3.9 °F6.5 °F

NOTE: If the error above is POSITIVE, then it means that the analysis temperature is HIGHER than the reported temperature. This means that your sensor is reading COLDER than expected.

  Standard deviation (4.5) is too large
 
MADIS
rating
MADIS rating 90% QC OK
 

Latest daily graph:

Latest daily graph

Your readings are not within an acceptable error range. The automated problem analysis cannot identify the problem. You can signup on the wxqc mailing list and post information about this situation there. This is may be caused by poor siting of the sensor (e.g. under eves, in screen porch, or in thick tree coverage). For information on siting, see CWOP Station Guide.

Wind Vector

The wind vector is the average wind over the relevant period. Note that if the wind blows North for half the time at 2 knots, and then blows South for the other half of the time at 2 knots, then the result is zero -- i.e. North wind and South wind will cancel out. Over time, the direction of the wind and of the analysis should match pretty well. If the lengths of the vector are different, then it could mean either that your anemometer reads high or low, or that you are in a more shielded or more open space.
MADIS
rating
MADIS rating 97% QC OK
TodayLast 7 days
Wind vector chartWind vector chart for last 7 days

Neighboring Stations

This is a list of stations that are close to this station. Note that this is not the list of stations that are used in the data analysis. That list of stations is known only to MADIS. You can see all the stations at MADIS Data Display. Your station should be in the middle of the display. If you think that the analysis is incorrect, then maybe one of the close stations has failed.

You can look at those for comparison purposes. The average difference between your station and each station below is listed as well. This may allow you to detect local stations which are erroneous. You can also use these numbers to adjust your instruments -- especially if a number of ASOS stations have similar differences to your station. Also, try increasing the analysis period to more than the default 28 days. The difference is only given if both stations report reasonably often during each day. Some stations only report every 6 hours, and this makes the average of less interest. In this case, the average is not displayed. The values reported are the differences between this station and the neighboring station. I.e. if the difference is positive, then this station is reading higher than the neighboring station. Since this station has not been reporting continuously during the analysis period (it missed 16 days out of 28), the offsets below may not be accurate.

You can also subscribe to an RSS feed to tell you when new stations come online in this area. Choose either within 100 miles or 250 miles . For stations covered by your Forecast Office: San Joaquin Valley (HNX) .

SiteDistanceLocationBarometerTemperatureDewpoint
FW200010.4 milesNortheast Groveland, CA, US (lat 37.8637°, long -120.1703°, altitude 866 metres) 9.9°F4.6°F
GW087119.1 milesNorth TWAIN HARTE, CA, US (lat 38.0027°, long -120.3355°, altitude 772 metres) 13.6°F3.8°F
DW115526.6 milesWest Knights Ferry, CA, US (lat 37.8255°, long -120.7337°, altitude 120 metres) 18.1°F-5.1°F
DW424629.8 milesSouth Merced, CA, US (lat 37.3283°, long -120.4520°, altitude 55 metres) 19.1°F-5.0°F
GW123532.0 milesSouthwest MERCED, CA, US (lat 37.3250°, long -120.5410°, altitude 50 metres) 20.0°F-5.9°F
GW299432.7 milesSouthwest Merced, CA, US (lat 37.3019°, long -120.5078°, altitude 52 metres) 18.2°F-5.8°F
EW485032.8 milesWest Oakdale, CA, US (lat 37.7652°, long -120.8610°, altitude 46 metres) 19.3°F-5.6°F
FW922636.6 milesNorth Arnold, CA, US (lat 38.2579°, long -120.3329°, altitude 1269 metres) 7.4°F8.5°F
WA5KWK42.0 milesNorth Rail Road Flat, CA, US (lat 38.3060°, long -120.5145°, altitude 858 metres) 10.2°F3.1°F
FW566150.1 milesSouthwest Crows Landing, CA, US (lat 37.3352°, long -121.0270°, altitude 29 metres) 19.7°F-4.1°F

Quality Control Notes

This page reports on the quality control checks performed by MADIS. The green check mark and red cross are chosen based on the average performance during the analysis period (which is selectable above). The red cross can appear even if MADIS reports that all observations pass the MADIS QC checks.

The 'MADIS rating' reports on the percentage of observations that pass the MADIS checks. You should aim for two thumbs up!

Location Formats

The location is shown in three different formats. Each of these is used in some software, and is shown on some websites.

Degrees Minutes Seconds: VWS/VWSAPRS, WeatherLink 5.5, WeatherLink (5.2-5.4), WeatherView (Linux)

Decimal degrees: FreeWX, WeatherView32 (PC application)

LORAN: WeatherDisplay, WUHU, Henriksen WServer

Resources

CWOP Home: This describes the whole CWOP program and has a large amount of useful information.

CWOP Siting Guide (PDF): This is a guide to siting and operating a CWOP station. This is a must-read document.

Another CWOP Guide (PDF): This is another guide to siting and operating a CWOP station. This is a must-read document.

Urban Siting and Operations (PDF): This is a guide to siting and operating a CWOP station in an urban environment.

APRS WX Message format: This describes the actual format of the messages transmitted that carry WX information.

WXQC Mailing List: This is a mailing list where data quality issues are discussed. Assistance with software configuration can often be found here.

Topo Map Reading Guide: How to read USGS topographic maps, with a good section on reading contours.

Geographically nearby web pages: Use Geourl to find web pages that deal with locations geographically close to this site.


Overall website comments, problems etc to Philip Gladstone
Page layout last modified Sunday, 28 February 2016
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