[轉錄]Re: Why is 850MB so important?
※ 本文轉錄自 [Meto_e] 看板
發信人: sy_nttvr@gurcragntba.pbz (I R A Darth Aggie), 看板: Meto_e
標 題: Re: Why is 850MB so important?
發信站: Texas A&M University - Tallahassee (Fri Dec 20 17:40:25 2002)
轉信站: itcz!news2.wam.umd.edu!cadig2.usna.navy.mil!hammer.uoregon.edu!News.Dal
Origin: aggie.stat.fsu.edu
On 20 Dec 2002 14:03:35 -0800,
Daryl <daryl@stmm.com>, in
<ea247dac.0212201403.305b851c@posting.google.com> wrote:
+> This probably looks like a stupid question, but as I've been reading
+> more detailed forcasts (especially in relation to lake effect snow).
+> I see references to the 850MB readings. While I understand WHAT the
+> 850 MB reading is, I have yet to find a good explaination as to WHY
+> 850 is so important. What happens at 850 MB that does not happen at
+> 700MB or 900MB that makes this reading so critical?
Ummm...the 850 mb level is a mandatory level, so you're always
guaranteed of getting data there. That's part of the magic. The other
is that lake effects tend to be shallow, so 700mb (also a mandatory
level) is probably too high to give insight into lake effects. 850
probably provides enough insight to be useful, at least in some (many?
most?) circumstances.
1000mb is also mandatory, but it may not exist, or is very close to
the surface data.
Does that help?
James
--
Consulting Minister for Consultants, DNRC
I can please only one person per day. Today is not your day. Tomorrow
isn't looking good, either.
I am BOFH. Resistance is futile. Your network will be assimilated.
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