Received: by zonker.hpl.hp.com (1.37.109.8/15.5+ECS 3.3+HPL1.1) id AA09443; Fri, 13 Oct 1995 01:58:24 -0700 Date: Fri, 13 Oct 1995 01:58:24 -0700 From: Ken Poulton <poulton@zonker.hpl.hp.com-DeleteThis> Return-Path: <poulton@zonker.hpl.hp.com-DeleteThis> Message-Id: <9510130858.AA09443@zonker.hpl.hp.com-DeleteThis> To: windspeed@zonker.hpl.hp.com-DeleteThis Subject: new data
I added
sunrise and sunset data
phase of the moon data
the ebb at 3rd is best at the full and new moon
a better tide calculation
This is based on xtide 1.2. This largely agrees with the
previous calculation method, except when we get a
low high and a high low (only a foot or two between the
low and the high). In this case, the old program
overestimated the tidal height of the higher-than usual low
tide at Palo Alto (leading to more mud showing than
expected). The new program seems to underestimate the tidal
height at this kind of low tide, which will lead to more
water than expected.
The new program also calculates "safe" times for 3rd and
Palo Alto. These are chosen at pretty conservative levels:
+2.5 for 3rd and +4.0 for Palo Alto. At these heights, you
can sail with no worries. At both sites you can sail
in about a foot less if you know where the bars are.
(One foot typically corresponds to 40-60 minutes time difference.)
Oak_500mb "site"
"Oak500mb" is the 500 millibar (~~18,000 feet) reading from
the twice-a-day weather sounding balloons released from
Oakland Airport. When the jetstream is overhead, this will
show westerly around 50 knots, which tends to add some extra
push to whatever surface pattern we have.
Ken Poulton
poulton@opus.hpl.hp.com-DeleteThis
"Software means never having to say you're finished." -- J.D. Hildebrand
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