it looks like you are sniffing some traffic, but there is nothing of 
substance

the lines that say 'sniff: timestamp=xxx ...' are individual tcp packets - 
you are getting standard 60-byte packets, with a 20-byte header plus 34 
bytes.  that leaves a payload of 6 bytes.

but the payload is only the bytes

02 04 02 18 00 00

which does not look like data from the weather station, so the interceptor 
ignores them

so lets decode one of the packets to see exactly whose conversation you are 
sniffing.  it used to be kinda fun (if rather monotonous) to decode these 
by hand, but now there are web sites that do it for you.  try this one:

http://packetor.com/

paste in a packet such as this one:

c4 71 54 35 98 c0 00 04 a3 91 5c 9d 08 00 45 00 00 2c b9 bd 00 00 64 06 a5 
84 c0 a8 02 97 7b 01 b9 49 12 00 00 50 f7 0e c6 35 00 00 00 00 60 02 00 64 
d4 3f 00 00 02 04 02 18 00 00

and it gives you lots of stuff.  we can see that the source is 
192.168.2.151 and the destination is 123.1.185.73.  destination port is 80

nslookup and dig do not tell us anything about 123.1.185.73.  whois tells 
us it is owned by "NWT Broadband Service", and appears to be based in hong 
kong.  but you can get that from the web site that did the packet decoding.

it looks like most of the packets you posted are like that.  so the lw301 
is probably trying to phone home.

if you try to hit 123.1.185.73 directly on port 80, you'll get a timeout.  
does not matter whether i use a web browser, or curl or wget.  they could 
be blocking based on user agent, but that is doubtful, since there is not 
even an initial handshake.

i seem to recall that oregon scientific abandoned all of their lw30x users 
when they shut down their online service some time ago.  do you know if 
that is true?  does your lw301 work properly when left to itself?

so instead of sniffing, try listening.  when the interceptor is in listen 
mode, it will behave as if it were the oregon scientific servers, so your 
lw301 will never know the difference.

sniff mode is generally for the cases where you want the device to talk to 
the mothership, and you just want to eavesdrop

listen mode is when you want to be the mother

m

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