Re: Back here, at 40°C
- Subject: Re: Back here, at 40°C
- From: J* D*
- Date: Mon, 13 Aug 2001 11:24:43 -0700 (PDT)
We get winter fog like this on a larger scale in
California. "Tule Fog." It forms inland on clear
nights after rain, and sometimes flows out through the
Bay and the Golden Gate into the ocean, in a movement
opposite that of our summer advection fog. It's very
dank and dense (and 20F chillier), and tends to move
silently, with almost none of the wind associated with
summer fog. The inversion layer above it tends to be
lower, too, from 500-1500 feet altitude vs. 1000-2500
in summer.
--- Tony & Moira Ryan <theryans@xtra.co.nz> wrote:
> Barry Garcia wrote:
>
> > I wonder if a similar situation near Monterey is
> why we end up with fog a
> > lot as well. The Salinas Valley is about 100 miles
> long, very broad
> > (probably 5 miles or so wide for most of its
> length, but is at the mouth
> > about 20 miles wide), opens directly to the sea
> (the mouth is between the
> > Santa Lucia and Gabilan Ranges), and gets quite
> hot around San Ardo (the
> > south end of the valley). This valley is where
> probably most of the salad
> > greens are grown in the US (IIRC, i forget, but
> it's a pretty lucrative
> > agricultural area....the southern end hosts
> vineyards).
>
> Rather late comment on this........
>
> We live in a valley that stretches up some 11 miles
> from the sea to this
> suburb and ends in a fairly spacious basin among
> hills (big enough for a
> suburb of around 17K people).
>
> At the south (seawards) end of the basin, the valley
> is quite narrow and
> there is a natural "sill" barely 20 feet high - the
> stream that drains
> the basin flows out through a man-made "ravine" on
> its way to join the
> main river that flows our from a side-valley.
>
> In winter, we often get "radiation fog" due to
> condensation of moisture
> in the air trapped in the basin as the air cools
> overnight. The
> interesting thing about this is that the fog stops
> at the "sill", as to
> the south of the sill there is free gravity drainage
> all the way down
> the valley to the sea.
>
> We happen to live in the side valley where the main
> (Wainuiomata) river
> flows out into the main valley. This is below the
> sill, and we almost
> never get this overnight fog. In our early days here
> it used to surprise
> us if we went out at night to find that we ran into
> thick fog as we
> crested the slight sill going into the main basin -
> and later, on our
> way home, we would creep along through the fog until
> we crested the main
> ridge and suddenly popped out into clear starlit
> night!
>
> Tony
> --
> Tony & Moira Ryan <theryans@xtra.co.nz>
> Wainuiomata, New Zealand, SW Pacific. 12 hours ahead
> of Greenwich Time
>
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