Aircraft Observations Available through AWIPS

Three PACJET aircraft products are available through AWIPS. These are all text products, graphical products are under development.

PIL Product description
MIAREPNT2 MinObs: 30 second flight data.
MIAREPPN3 Dropsonde data.
MIAREPPN0 Reconnaissance messages.

How to read the MinObs | How to install the Obs

All WR WFOs:

If you've done the AWIPS installation described in the PACJET Alert ADMMSG of 1250 PST 7 February 2001, you can now view PACJET flight data on your text workstation. As there indicated, these data can be retrieved by typing in the PIL: MIAREPNT2

What you'll then get is a text product that looks like the following (Note: see the PACJET home page for latest info on when the aircraft will be flying).

URNT40 KWBC 090850
NOAA3 WXWXE TRAIN
084030  3920 12457  2861 -0062 230025 +031 +018 234026 999 999
084100  3922 12458  2875 -0064 236027 +031 +013 236027 999 999
084130  3924 12458  2877 -0066 240027 +030 +015 240028 999 999
084200  3926 12459  2871 -0067 241026 +030 +016 240027 999 999
084230  3927 12500  2872 -0068 240024 +030 +015 240025 999 999
084300  3929 12500  2873 -0071 238025 +029 +021 237025 999 999
084330  3931 12501  2873 -0073 238027 +030 +020 237028 999 999
084400  3933 12502  2878 -0075 229027 +030 +028 234029 999 999
084430  3935 12502  2898 -0079 233020 +024 +023 215023 999 999
084500  3937 12503  3009 -0084 231021 +022 +014 234023 999 999
084530  3939 12503  3006 -0086 228021 +021 +017 223021 999 999
084600  3941 12504  2937 -0083 221024 +026 +012 222025 999 999
084630  3943 12504  2879 -0083 231029 +028 +012 230030 999 999
084700  3945 12504  2876 -0085 223028 +026 +013 227029 999 999
084730  3947 12505  2879 -0087 224025 +026 +009 222026 999 999
084800  3949 12505  2882 -0089 226026 +027 +011 226026 999 999
084830  3951 12506  2882 -0091 227027 +027 +012 227028 999 999
084900  3952 12507  2885 -0093 227026 +026 +011 228028 999 999
084930  3954 12507  2881 -0094 221021 +025 +010 218021 999 999
085000  3956 12508  2881 -0096 213024 +024 +009 211024 999 999
These are aircraft flight level meteorological data taken at 30-sec intervals. The data are transmitted collectively every 10 minutes. Here's a basic guide to decoding these reports:

Col. 1: HHMMSS   The time of the observation in hours, minutes and
                 seconds (UTC).  All averages (except peak wind) are
                 centered around this time.

Col. 2: LLmm     The latitude of the observation in degrees and minutes. 

Col. 3: LLLmm    The longitude of the observation in degrees and
                 minutes.

Col. 4: PPPPP    The pressure altitude in feet.

Col. 5: +/-DDDD  The D-value (Geopotential Altitude - Pressure Altitude)
                 in feet.  There will always be a leading sign (+ or -)
                 followed by 4 numeric characters (leading zeros if 
                 required).

Col. 6: WWWSSS   WWW: The wind direction in degrees, with 0 being true
                 North, increasing clockwise.
                 SSS: The wind speed in knots.

Col. 7: +/-TTT   The air temperature in degrees and tenths Celsius.

Col. 8: +/-ddd   The dew point temperature, encoded the same way as air
                 temperature.

Col. 9: wwwsss   www: The direction of the peak wind during this
                 interval (30 sec, 1 min, etc.).  The peak wind is
                 defined as the maximum 10-sec average wind.
                 sss: The speed of the peak wind in knots.


Cols. 10 and 11:  Not used here -- each will show up as 999.

As an example, here's the first line of the above report and the decoded information contained therein:

084030 3920 12457 2861 -0062 230025 +031 +018 234026 999 999

Observation time: 0840 and 30 sec UTC

Latitude: 39.2 N Longitude: 124.57 W

Pressure Altitude: 2861 ft

D-value: -62 feet

Wind: 230 deg at 25 kts

Air Temp: 3.1 C

Dew Point: 1.8 C

Peak wind during past 30 seconds: 234 deg at 26 kts

If dropsondes are deployed, data will be transmitted on AWIPS with the PIL MIAREPPN3 and recon messages (text description of something interesting observed from the plane) with the PIL MIAREPPN0. To decode the former (and for further info on the flight level data), see Appendix G to the National Hurricane Operation Plan, which is available on-line as a PDF document at:

http://www.ofcm.gov/NHOP/00/nhop00.htm

...Warren Blier (WFO Monterey SOO)

How to read the Obs | How to install the Obs

1) on as2 edit /data/fxa/nationalData/ispan_table.template to add the following lines:

URNT40KWBC  MIAREPNT2     (this file is in alphabetical order)
URPN10KWBC  MIAREPPN0     (that's a zero at the end)
UZPN13KWBC  MIAREPPN3

2) cd /awips/fxa/data/localization/scripts

3) ./mainScript.csh -text

4) stop StdDBDecoder (ps -ef | grep Std and then kill, it will restart on its own)

The MinObs product will then store in MIAREPNT2, reco messages in MIAREPPN0, and dropsondes in MIAREPPN3.

Kevin Schrab
SSD/NWS