METAR Information for KGRY in Green Canyon 338, LA, United States (site inactive)

The following information is known about KGRY. 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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Registered Location

Latitude: 27° 37' 30" N (deg min sec), 27.6250° (decimal), 2737.50N (LORAN)
Longitude: 90° 26' 28" W (deg min sec), -90.4410° (decimal), 09026.46W (LORAN)
Elevation: 56 metres (183 feet)
Location: Green Canyon 338, LA, United States
Observing program(s): AWOS

The elevation does not correspond with the estimated elevation (-9999 metres (-32805 feet) -- source Geonames) 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 'KGRY' 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 8 data sources. 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.

Date	Latitude	Longitude	Elevation	Name
2010-11-08	27.6250	-90.4410		Green Canyon 338 / Front Runner (Murphy E&P)
2011-01-23	27.6250	-90.4410	9999	Green Canyon 338, LA, United States
2011-01-24	27.6250	-90.4410	9999	Green Canyon 338, United States of America
2011-02-15	27.6250	-90.4410	55	Green Canyon 338 (Murphy E&P)\|GC-338\|Front Runner, LA, XG
2011-06-19	27.6250	-90.4410	0	Green Canyon 338, LA, United States
2011-06-20	27.6250	-90.4410	58	Green Canyon 338, LA, United States
2022-12-18	27.6250	-90.4410	55	Green Canyon 338, LA, United States

The position of the clicked point on the map is:

The position of the 'KGRY' marker on the map is:

Latitude: dummy (deg min sec), dummy (decimal), dummy (LORAN)
Longitude: dummy (deg min sec), dummy (decimal), dummy (LORAN)

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

Picture Submission

There are two ways to submit pictures. If you are a flickr user, then see the flickr section below. Otherwise you can simply email the pictures as follows:

Email the pictures to kgry@photo.gladstonefamily.net.
If you use a smartphone that embeds the GPS coordinates in the pictures, then you can send any picture of a weather station to gps@photo.gladstonefamily.net and it will be associated with the correct station automatically.

Flickr Upload

Uploading picktures to flickr.com is easy. If you do not have a free flickr account, then you need to create one. Just go to flickr and click the 'Create your account' button. You can use a google account if you have one.

Once logged in, click on 'Upload Photos & Video'. Next click on 'Choose Photos and Videos', and walk through the process to upload your pictures. They will automatically be resized appropriately.

After the upload is complete, it will ask you to add titles, tags and descriptions. The key step is to add tags as follows:

wxtagged -- this indicates that this picture is of a weather station or surrounding area
wx:metar=kgry -- this indicates the site of which this is a picture
wxstation -- add this tag if the picture includes the weather station.

If you had to create your account, then you must upload at least five pictures. It will also take longer for your pictures to appear (a week or so). Otherwise, the pictures should appear after 24-48 hours.

You can try to find photographs from the area surrounding the site marker by clicking on Find nearby photographs. (There are some) (There are none) (There may be some) (Automatically loaded if any)

Data Status

Data has been seen on each of the last 26 analyzed days.

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

By default, the longer analysis periods display graphs that show the long term performance of this station. The graphs show the mean error over time, and include error bars which are one standard deviation long. This provides an easy way to see if there are any underlying trends in the data. Note that a 'step' in your data does not (necessarily) mean that something happened to your station. It could mean that another station came online in the local area, and they are changing the analysis.

The analysis is performed by MADIS. This web page just provides visualization of the data that MADIS produces. There are a number of very knowledgeable people who participate on the WXQC Mailing List who do understand exactly how MADIS works and can resolve issues when the analysis seems to be broken. However, in most cases, the station readings are at fault, or the software that is transmitting the data to CWOP. Please check those paths first.

You can also see how this station compares with other stations.

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.

Barometer

Average barometer error:	0.1 milliBars
Error standard deviation:	0.3 milliBars

MADIS
rating

Latest daily graph:

These values are within range, so your sensor is probably calibrated correctly.

Temperature

	24 hours
Average temperature error	-
Error standard deviation	-

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

Latest daily graph:

Not enough data has been received to perform a day / night analysis to check for various types of shielding problems. Please wait a few days, and then try again.

Dewpoint -- or switch to Relative Humidity

	24 hours	Day time	Night time
Average dewpoint error	1.5 °F	1.2 °F	1.7 °F
Error standard deviation	1.6 °F	1.3 °F	1.7 °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

Latest daily graph:

These values are within the acceptable range. This probably means that your sensor is sited correctly and is calibrated correctly.

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

Today		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.

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 .

Site	Distance		Location	Barometer	Dewpoint
EW5037	133.0 miles	North	Houma, LA, US (lat 29.5368°, long -90.6717°, altitude 0 metres)	-0.9mb	2.7°F
EW6903	140.9 miles	North	Lockport, LA, US (lat 29.6600°, long -90.5448°, altitude 1 metres)	-1.2mb	-0.0°F
FW4663	150.2 miles	North	Thibodaux, LA, US (lat 29.7747°, long -90.7857°, altitude 1 metres)	-1.6mb	2.2°F
FW0324	157.2 miles	North	Thibodaux, LA, US (lat 29.8733°, long -90.8173°, altitude 1 metres)	-0.9mb	1.8°F
GW1868	160.6 miles	North	VACHERIE, LA, US (lat 29.9370°, long -90.6931°, altitude 3 metres)	-1.3mb	0.4°F
CW2378	162.7 miles	North	New Orleans, LA, US (lat 29.9688°, long -90.2180°, altitude 2 metres)	0.1mb	0.9°F
GW2274	162.8 miles	North	NEW ORLEANS, LA, US (lat 29.9603°, long -90.1050°, altitude 1 metres)	-1.9mb	-0.1°F
GW4801	163.7 miles	North	METAIRIE, LA, US (lat 29.9833°, long -90.2167°, altitude 0 metres)	-0.3mb	-1.0°F
GW0610	164.2 miles	North	Metairie, LA, US (lat 29.9845°, long -90.1388°, altitude 0 metres)	-0.1mb	0.6°F
EW1090	165.6 miles	North	Metairie, LA, US (lat 30.0050°, long -90.1422°, altitude 0 metres)	-0.7mb	-0.1°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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