Dawson McDougal wrote:
Here's a weather lesson for you, something you may not encounter all that
often across the pond, a classic winter storm combined with upslope flow at
the surface, this spells disaster for areas of higher elevation 7,000+ ft.
Parts of Wyoming and Nebraska will see anywhere from 1 to 3 feet of snow
from this system, could turn into a bad one for the entire northern plains
if it can gather enough moisture.
http://www.crh.noaa.gov/ifps/MapClic....202088&rlon=-
Over here we generally have just the one form of snow. On the west
coast where the strong winds come in the temperature rises. This
invariably happens with every Low. So if this system causes snow it
falls wet and messy.
It looks good for an hour or so, maybe even a day or two but then it
becomes a major depressant. To this day we argue the toss about the
weather being "warm enough to snow."
I think the main argument comes from those on the east coast who get to
experience the occasional fall of snow if an east wind makes it out of
a Siberian High.
British and Norwegian weather very much depends on the Azores High and
its counterpart the Icelandic Low.
(When the phases are right and the code works as it should, no major
seismic disturbances building or super cells dissipating all the
energy; you can sometimes see the Azores High building -even moving to
compensate for the declination of the moon.)
In the good old days before Andrew Lane fecked up the BBC weather
centre with his banal maps of porridge, you could see the Lows bleeding
off Canada and feeding the Icelandic singularity.
Then there would be some major change in the spell and an occlusion
moves from it's stationary post along the North Atlantic Ridge and if
it hits Scotland or Norway you can count on something extra showing up
on the NEIC lists.
I dare say you might be able to follow something similar with the
Monsoon Low that moves up from Mexico and goes to the SW States.
From the Wikipedia:
North American Monsoon
The North American monsoon occurs from mid July into September and
affects Arizona, New Mexico, Nevada, Utah, Colorado, West Texas, and
California. It pushes as far west as the Peninsular Ranges and
Transverse Ranges of southern California but rarely reaches the coastal
strip.
The North American monsoon is associated with an area of high pressure
called the subtropical ridge that moves northward during the monsoon.
At the surface, the monsoon is associated with weak highs that form
over the four corners region and the southern Great Plains and a
thermal low that forms over Baja California. The Bermuda high also
plays some role in the monsoon.
The placement of the high and low pressure areas cause the wind to
shift from westerly to southerly. Moisture is drawn northward from the
Gulf of California into northern Mexico and the Southwest United
States. Rainfall during the monsoon occurs as thunderstorms over the
southern Rocky Mountains and adjacent areas.
http://en.wikipedia.org/wiki/Southwest_monsoon
Here's a list of phases:
http://aa.usno.navy.mil/cgi-bin/aa_m...r=2006&ZZZ=END
Just change the number for the year or go he
http://aa.usno.navy.mil/