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Re: Weather Questions & Answers

Postby Fu Manchu » Fri Sep 26, 2008 7:03 am

http://cimss.ssec.wisc.edu/tropic/real- ... convw.html

In this link the areas off the west coast are grouped into two areas. One with positive indicies and the other in the negatives.
What do those numbers indicate in regard to convergence?
Temperature?

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Re: Weather Questions & Answers

Postby lightningwog » Sun Oct 19, 2008 8:36 pm

hope this helps with that web site of low level convergence..

Convergence
A contraction of a vector field; the opposite of Divergence. Convergence in a horizontal wind field indicates that more air is entering a given area than is leaving at that level. To compensate for the resulting "excess", vertical motion may result: upward forcing if convergence is at low levels, or downward forcing (subsidence) if convergence is at high levels. Upward forcing from low-level convergence increases the potential for thunderstorm development (when other factors, such as instability, are favouale). Compare with Confluence.

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Re: Weather Questions & Answers

Postby lightningwog » Sun Oct 19, 2008 10:02 pm

oops you probably know that :lol:.

the broken lines means decreasing winds in knots and continous line are the increasing winds also in knots

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Re: Weather Questions & Answers

Postby Fu Manchu » Mon Oct 20, 2008 5:36 pm

na mate and thanks for the answer :)

I found another plot similar
http://cimss.ssec.wisc.edu/tropic/real- ... msshtw.GIF

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Re: Weather Questions & Answers

Postby Vinny » Mon Oct 20, 2008 9:42 pm

how come adelaide when it had 34 ish a few days ago had 5 percent humidity?? and yet when perth has 35 ish today it had only 19-20 percent humidity. So basically why does the humidity in adelaide always seem to be lower than in perth when it is in the high 30's in temp in Adelaide? or maybe the humidity during the day is not always lower in adelaide than perth ? ( i hope you get what i mean !)
Yeppoon Annual Average Rainfall is (BOM) = 982.5mm
2012 Yeppoon 976.8mm
2014:1114.2mm

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Re: Weather Questions & Answers

Postby Vinny » Fri Dec 12, 2008 1:13 pm

Why was 1995 so wet....apart from the fact because it rained a lot...

there were nearly 8 months of 100mm or more according to stats from bom :o
Yeppoon Annual Average Rainfall is (BOM) = 982.5mm
2012 Yeppoon 976.8mm
2014:1114.2mm

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Re: Weather Questions & Answers

Postby Vinny » Sun Mar 22, 2009 3:29 pm

Where does a cold front go once it has past SW WA , SA , VIC and NZ does it go around in a circle and back to antarctica?

I always wondered what happens...

Or does it just break down?
Yeppoon Annual Average Rainfall is (BOM) = 982.5mm
2012 Yeppoon 976.8mm
2014:1114.2mm

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Re: Weather Questions & Answers

Postby Fu Manchu » Mon Mar 23, 2009 3:10 pm

Just look at the world a bit different Vinny.
Here are the southern charts.
The southern Indian...
Image
and the southern Pacific...
Image

They all go around and a round. They will weaken and others will form else where.
A big race track around Antartica.

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Re: Weather Questions & Answers

Postby Vinny » Wed Apr 08, 2009 9:20 pm

If only Australia was further south !
Yeppoon Annual Average Rainfall is (BOM) = 982.5mm
2012 Yeppoon 976.8mm
2014:1114.2mm

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Re: Weather Questions & Answers

Postby Wundo » Thu Apr 30, 2009 12:40 am

vinny06 wrote:how come adelaide when it had 34 ish a few days ago had 5 percent humidity?? and yet when perth has 35 ish today it had only 19-20 percent humidity. So basically why does the humidity in adelaide always seem to be lower than in perth when it is in the high 30's in temp in Adelaide? or maybe the humidity during the day is not always lower in adelaide than perth ? ( i hope you get what i mean !)


Hi Vinny,

It depends on where the air mass is from somewhat. Whether it is a continental or maritime or polar air mass etc, and also the effect of the doctor. It certainly can't be said that the humidity is always lower in Adelaide than for similar temps in perth. Lower humidity means less water vapour in the air and Adelaide having only 5% humidity says to me it was being affected by a hot dry continental air mass, with very little moisture in it.
Similar temps in perth with a higher humidity is indicative of the fact that perth has a huge body of water close to it so generally there is going to be more moisture in the air mass, depending on where the trough lies, what the doctor is doing etc. Hope this helps somewhat.
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Re: Weather Questions & Answers

Postby Wundo » Thu Apr 30, 2009 12:48 am

vinny06 wrote:Why was 1995 so wet....apart from the fact because it rained a lot...

there were nearly 8 months of 100mm or more according to stats from bom :o


It's because the gods were drinking a lot that year and when u drink a lot you pee a lot..
But seriously, some questions are not that easy to answer. 1995 we were coming out of an el nino but I'm not sure exactly how that effects rainfall in these parts. Perhaps u can one day do your PhD on ENSO effects on WA..
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Re: Weather Questions & Answers

Postby Vinny » Thu Apr 30, 2009 8:20 pm

I've already been at uni far too long, I won't be doing a phD :wink:

Thanks for the answers.

I was thinking of another question today. Has Perth ever had a year with an annual total of only around 100mm of rain or less? like in 1800's or something I would guess "no"?
Yeppoon Annual Average Rainfall is (BOM) = 982.5mm
2012 Yeppoon 976.8mm
2014:1114.2mm

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Re: Weather Questions & Answers

Postby Wundo » Thu Apr 30, 2009 10:23 pm

vinny06 wrote:I've already been at uni far too long, I won't be doing a phD :wink:

Thanks for the answers.

I was thinking of another question today. Has Perth ever had a year with an annual total of only around 100mm of rain or less? like in 1800's or something I would guess "no"?


For that answer I think you'd have to make a formal request to dig into the BOM archives..
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Re: Weather Questions & Answers

Postby thunderbox » Mon Jun 22, 2009 2:04 pm

Please excuse me for being such a dumb arse old fart--- but how do I upload pics?
CHEERS--

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Re: Weather Questions & Answers

Postby Lert » Tue Jun 23, 2009 5:53 pm

What I do is upload my pics by ftp to my personal space at my ISP then when you are doing a post and want to include pics, click the Img button then copy the url of your pic between the [img]and[/img]. Best to then click preview to make sure you have it right. Other ppl upload to a photo site such as Flickr but I dont have an account with any of those. Hope that helps, sounds as clear as mud to me :mrgreen:
2006 - 543.5mm, 2007 - 701.5mm, 2008 - 833.5mm, 2009 - 579mm, 2010 - 631.5mm, 2011 - 872.5mm, 2012 - 770mm

2013 Jan 5mm YTD 5mm

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Re: Weather Questions & Answers

Postby thunderbox » Wed Jun 24, 2009 8:12 am

Lert wrote:What I do is upload my pics by ftp to my personal space at my ISP then when you are doing a post and want to include pics, click the Img button then copy the url of your pic between the [img]and[/img]. Best to then click preview to make sure you have it right. Other ppl upload to a photo site such as Flickr but I dont have an account with any of those. Hope that helps, sounds as clear as mud to me :mrgreen:

Thanks for that info Lert. I have a flickr account-- so I will use that.
:)

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Re: Weather Questions & Answers

Postby Vinny » Thu Feb 11, 2010 1:16 pm

Am I right in that Perth has only had average rainfall twice from 2000 to 2009 with that year being 2003 and 2005 ?
Yeppoon Annual Average Rainfall is (BOM) = 982.5mm
2012 Yeppoon 976.8mm
2014:1114.2mm

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Re: Weather Questions & Answers

Postby Vinny » Mon Feb 22, 2010 12:09 pm

How many days does Perth average each month of Summer that are considered humid ? 12 ?
Yeppoon Annual Average Rainfall is (BOM) = 982.5mm
2012 Yeppoon 976.8mm
2014:1114.2mm

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Re: Weather Questions & Answers

Postby nocky » Mon Feb 22, 2010 2:54 pm

is 12 the question or the answer

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Re: Weather Questions & Answers

Postby Vinny » Tue Feb 23, 2010 10:48 pm

I should have reworded that question....

Anway 12 was the question.
Yeppoon Annual Average Rainfall is (BOM) = 982.5mm
2012 Yeppoon 976.8mm
2014:1114.2mm

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