Why do have to read weather like this?

KHSV 221553Z 19009KT 6SM BR FEW020 BKN035 OVC100 19/18 A2986 RMK
AO2 TSE00RAE11 SLP104 TS MOV NE P0000 T01890178=

I know, and I can read it. And someone is going to say that they
prefer it that way.

I can just see an ASR-33 Teletype machine jumping up and down and
saying that 10 characters per second is what God made for us.

Kind of like the farmers here who said that we were messing with God's
time when we went to daylight savings time.

Rant still on,

Mike Weller

On Fri, 22 Apr 2005 12:37:54 -0500, wrote:

KHSV 221553Z 19009KT 6SM BR FEW020 BKN035 OVC100 19/18 A2986 RMK
AO2 TSE00RAE11 SLP104 TS MOV NE P0000 T01890178=

I know, and I can read it. And someone is going to say that they
prefer it that way.

I prefer it this way. Once you are used to it, it is shorthand, and
is quicker to read than the longhand version, which would read
something like this...

Huntsville International Airport, April 22, 1553Z weather. Winds
190@09kts, 6 statute miles visibility in mist. Few clouds at 2000
feet, broken cloulds at 3500 feet, overcast clouds at 10,000 feet.
Temperature 19 deg C, dewpoint 18 deg C, Altimeter 29.86...

We don't. There are at least a dozen translator tools out there, including
DUATS and ADDS.

Michael

wrote in message
news:1114190529.b66f5cddb1aec1ba47dfaf0f4432d36e@o nlynews...
KHSV 221553Z 19009KT 6SM BR FEW020 BKN035 OVC100 19/18 A2986 RMK
AO2 TSE00RAE11 SLP104 TS MOV NE P0000 T01890178=

I know, and I can read it. And someone is going to say that they
prefer it that way.

I can just see an ASR-33 Teletype machine jumping up and down and
saying that 10 characters per second is what God made for us.

Kind of like the farmers here who said that we were messing with God's
time when we went to daylight savings time.

Rant still on,

Mike Weller

On Fri, 22 Apr 2005 12:37:54 -0500, wrote:

KHSV 221553Z 19009KT 6SM BR FEW020 BKN035 OVC100 19/18 A2986 RMK
AO2 TSE00RAE11 SLP104 TS MOV NE P0000 T01890178=

I know, and I can read it. And someone is going to say that they
prefer it that way.

I can just see an ASR-33 Teletype machine jumping up and down and
saying that 10 characters per second is what God made for us.

How about FDL uplinks? I think they're only around 30K/s. I'd rather
see that used uploading the Nexrad info rather than English form
METAR.

The translation of the raw data is trivial to do in the client end of
the system (a-la the Bendix KDR510/810, or the XM weather in the
G1000, it shows both decoded and raw-data TAF and raw-data METAR if
available for the reporting stations).

So technically, we don't have to read weather like that, there's just
not (or is there? hmm) a simple program where one can type in a
station and out pops the translated text (something more simple and
fast than aviationweather.gov or DUAT, just a quick and dirty
application - enter station(s) here, out comes realtext there..
Should be trivial to write for those who know how to do such things).

On Fri, 22 Apr 2005 14:35:52 -0400, Peter Clark
wrote:

On Fri, 22 Apr 2005 12:37:54 -0500, wrote:

KHSV 221553Z 19009KT 6SM BR FEW020 BKN035 OVC100 19/18 A2986 RMK
AO2 TSE00RAE11 SLP104 TS MOV NE P0000 T01890178=

I know, and I can read it. And someone is going to say that they
prefer it that way.

I can just see an ASR-33 Teletype machine jumping up and down and
saying that 10 characters per second is what God made for us.

How about FDL uplinks? I think they're only around 30K/s. I'd rather
see that used uploading the Nexrad info rather than English form
METAR.

The translation of the raw data is trivial to do in the client end of
the system (a-la the Bendix KDR510/810, or the XM weather in the
G1000, it shows both decoded and raw-data TAF and raw-data METAR if
available for the reporting stations).

It is not as trivial as it should be. METAR decoder software is
difficult to write because of the special weather statements that can
be included in a METAR entry (things like RVR, multiple precip types,
etc).

Simple parsers can grab winds, date, time, and cloud conditions. But
to be all-encompassing requires a bit more. I found a package (via
NOAA?) that would do METAR decodes, and it included approximately 30KB
of source code, which seemed like a lot for the extra bit of
functionality it provided.

On Fri, 22 Apr 2005 19:55:22 GMT, Nathan Young
wrote:

It is not as trivial as it should be. METAR decoder software is
difficult to write because of the special weather statements that can
be included in a METAR entry (things like RVR, multiple precip types,
etc).

Simple parsers can grab winds, date, time, and cloud conditions. But
to be all-encompassing requires a bit more. I found a package (via
NOAA?) that would do METAR decodes, and it included approximately 30KB
of source code, which seemed like a lot for the extra bit of
functionality it provided.

30K just for the parser, or did that include station name lookup
tables? Seems like the code should just do one pass through a
relatively straightforward nest of if/thens/elseif. Load the METAR
into an array since each element is space-delineated, the first two
elements are going to be the station name and time of issue (assuming
no SPECI). Then the rest of the code would be if/then for the
multiple elements. So, 19015G32KT 1SM -RA BR BKN010 BKN035 OVC050
would be IF (windtype) THEN (printwind) ELSIF (visibility) THEN
(printvis) ELSEIF (preciptype) THEN (printprecip) ELSIF (cloudtype)
THEN (printcloudtype) ELSIF (temp) THEN (printtemp) (blah blah blah) -
rinse/recycle/repeat the analysis for all non-null elements in the
array..

I think the problem with most of the decoders I've seen is that they
expect METAR elements in fixed positions and only code for the base
case and don't do any processing. Old weather injectors for MS Flight
Sim are good examples of this. Get an RVR in there and they'd have
cloud base numbers for the temp and all sorts of nasty errors.

"Peter Clark" wrote in message
...
On Fri, 22 Apr 2005 19:55:22 GMT, Nathan Young
wrote:

It is not as trivial as it should be. METAR decoder software is
difficult to write because of the special weather statements that can
be included in a METAR entry (things like RVR, multiple precip types,
etc).

Simple parsers can grab winds, date, time, and cloud conditions. But
to be all-encompassing requires a bit more. I found a package (via
NOAA?) that would do METAR decodes, and it included approximately 30KB
of source code, which seemed like a lot for the extra bit of
functionality it provided.

30K just for the parser, or did that include station name lookup
tables?


Like most computer code, 20 percent of it probably does the real work....
and the 80 percent is there to make sure that it exits elegantly and does
not run into an infinite loop, crash-to-operating-system, or report
ridiculous value... whenever it is fed garbage input or exceptional
conditions.

Hey, don't malign the ASR-33. It was the only input and output device on
the Nova II I had in grad school. Paper tape input will make a man of you.
Of course I hated it, but don't be unkind. :-)

--
Bob (Chief Pilot, White Knuckle Airways)


wrote in message
news:1114190529.b66f5cddb1aec1ba47dfaf0f4432d36e@o nlynews...
KHSV 221553Z 19009KT 6SM BR FEW020 BKN035 OVC100 19/18 A2986 RMK
AO2 TSE00RAE11 SLP104 TS MOV NE P0000 T01890178=

I know, and I can read it. And someone is going to say that they
prefer it that way.

I can just see an ASR-33 Teletype machine jumping up and down and
saying that 10 characters per second is what God made for us.

Kind of like the farmers here who said that we were messing with God's
time when we went to daylight savings time.

Rant still on,

Mike Weller

"Bob Chilcoat" wrote in message
...
Hey, don't malign the ASR-33. It was the only input and output device on
the Nova II I had in grad school. Paper tape input will make a man of
you.
Of course I hated it, but don't be unkind. :-)


ASR33? That's 8-level ASCII!!!

REAL men used 5-level baudot paper tapes with the shift-up-shift-down
characters for numbers-letters. Your aviation weather report (SA,
fore-runner of today's METAR) had to be decoded from something like this:

QWEXQTXUXEYQOXOOW

whenever the local machine failed to execute the appropriate
shift-up-to-numbers.

"Bob Chilcoat" wrote in message
...
Hey, don't malign the ASR-33. It was the only input and output device on
the Nova II I had in grad school. Paper tape input will make a man of
you.
Of course I hated it, but don't be unkind. :-)

--
Bob (Chief Pilot, White Knuckle Airways)

Yeah, who you foolin', ...you got your first reports off the telegraph!!