MesoWest Information for MTBC1 in Mount Baldy Forest, CA, United States Of America (site inactive)

The following information is known about MTBC1. 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.

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MTBC1
DW1871
FW8471
EW8187
EW0585
N6PJL
GW1944
FW7664
GW3660
FW4319
GW0529
GW5410
GW2993
EW7239
K6FW
GW3055
CW6479
CW8508
FW8267
FW0490
KB6HGN
FW0494
EW3127
DW2585
CW0987
FW6613
CW8284
GW4454
KJ6HT
DW3624
EW9929
KI6KEP
KC7O
FW2444
FW4558
FW9698
CW3917
WA6TJQ
FW3178
WX6YYZ
FW7102
GW5760
EW7942
EW9930
W0PE-1
N6RSX
FW4845
DW0490
GW4839
FW7595
EW6472
EW3060
DW6637
K7GIL
N6DBF
FW0823
DW7923
FW0025
FW0063
GW4237
EW9934
FW9244
FW2472
N6AMM
W6FL
FW1895
W3SN-13
EW6409
FW1313
EW3131
GW3218
CW9736
DW0394
DW4438
N6GPM
AB6OR
GW0717
FW6602
EW3172
W6OTO
KJ6TAG
GW5644
GW0986
EW9931
FW2143
GW5965
N6HGA-1
GW4487
FW5488
GW2644
AD6NH
CW7445
EW6473
DW3672
FW1624
GW4544
KB6CYS
DW1271
FW0058
FW6501
EW3970
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Registered Location

Latitude: 34° 14' 22" N (deg min sec), 34.2394° (decimal), 3414.37N (LORAN)
Longitude: 117° 39' 39" W (deg min sec), -117.6608° (decimal), 11739.65W (LORAN)
Elevation: 1311 metres (4300 feet)
Location: Mount Baldy Forest, CA, United States Of America
County: Los Angeles, CA
Data provider: LOXWFO
Forecast Office: Los Angeles (LOX)

The elevation does not correspond with the estimated elevation (1338 metres (4390 feet) -- source NED 1/3rd arc-second: Western United States) at that point. Either the location or the elevation (or both) are almost certain to be incorrect. Please use the 'send the updated information' link below to update the location or elevation.

The site location should be at the mark shown -- or very close. Clicking within the map area (or you can drag the 'MTBC1' 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 best way to get elevation is to consult a topographic map. Make sure that you know whether the contours are marked in feet or metres. Note that handheld GPS receivers do not provide readings of elevation accurate to better than 10-20 metres (technical discussion). If you do not have access to a topographic map, then a GPS receiver is acceptable, but make sure that it is operating in 3D mode and let it average the position for at least five minutes.

For more information on reading maps, please see the Topo Map Reading Guide -- in particular it discusses how to read contours.

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. Show location history.

There are no photographs of the station. If you have pictures of this location, then please email them to mtbc1@photo.gladstonefamily.net.

You can try to find photographs from the area surrounding the site marker by clicking on Find nearby photographs. (There are none)

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  

The inconsistency noted above in your location information means that the analyzed readings for your location may be incorrect. For example, if your location is incorrect, then the analysis values will be for a location other than your station. This will give different analysis results, probably leading to errors being shown below. If the elevation is incorrect, then the comparison of temperature readings will be in error.

Temperature

  24 hours  Day time  Night time
Average temperature error-10.7 °F-8.7 °F-12.3 °F
Error standard deviation3.8 °F3.9 °F2.7 °F
Worst average temperature error-14.4 °F-13.7 °F-14.9 °F
Worst standard deviation4.3 °F4.5 °F2.8 °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.

  Location problem
 
MADIS
rating
MADIS rating 86% 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.

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: Los Angeles (LOX) .

SiteDistanceLocationBarometerTemperatureDewpoint
FW84716.6 milesSoutheast Alta Loma, CA, US (lat 34.1517°, long -117.6137°, altitude 563 metres) 23.6°F
EW81877.1 milesSouth Alta Loma, CA, US (lat 34.1420°, long -117.6227°, altitude 529 metres) 24.3°F
GW19449.1 milesSouthwest LA VERNE, CA, US (lat 34.1318°, long -117.7508°, altitude 486 metres) 25.0°F
GW366011.7 milesSouth CLAREMONT, CA, US (lat 34.0765°, long -117.7183°, altitude 320 metres) 26.7°F
GW299312.9 milesSouth Ontario, CA, US (lat 34.0568°, long -117.6188°, altitude 292 metres) 25.4°F
GW305516.1 milesSouthwest Diamond Bar, CA, US (lat 34.0325°, long -117.7892°, altitude 331 metres) 27.1°F
CW850817.6 milesWest Duarte, CA, US (lat 34.1517°, long -117.9497°, altitude 237 metres) 25.4°F
FW826718.1 milesSouth Ontario, CA, US (lat 33.9907°, long -117.5638°, altitude 215 metres) 27.5°F
CW098720.0 milesSouth Chino Hills, CA, US (lat 33.9525°, long -117.7057°, altitude 297 metres) 26.2°F
KC7O23.0 milesWest Sierra Madre, CA, US (lat 34.1670°, long -118.0538°, altitude 294 metres) 25.8°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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