Thread: Blocking Lows
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Old October 10th 11, 01:35 AM posted to sci.geo.earthquakes,uk.sci.weather
Weatherlawyer Weatherlawyer is offline
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Default Moron Blocking Lows

On Oct 1, 3:49*pm, Weatherlawyer wrote:

Records are breakin in Britain as I speak, no easy feet with only a
keyboard to speak with, I assure you.

A Blocking Low is the sort of weather that is very unpleasant to the
natives after noon.

The nights are too hot and humid too.

More later.


Desultory affairs neath the ground atmosphecal ones unbound.

Rex someone or other defined the:

Rex Block... a blocking pattern that occurs along or near the West
Coast of the United States.
With two adjacent highs and lows, the most impressive will have a
strong low pressure next to a strong high pressure. (That figures, was
he promoted for that?)

The high pressure will be located in a generally north direction from
the low pressure. The low associated with the Rex Block is not
completely cut-off from the upper level flow, but does have little
east-west movement.

Strong ridging north of the low causes the airflow to move from high
latitudes to low latitudes with little comparable west-east movement
of the air. The airflow pattern follows a backward "S" trajectory. In
the example image, air flowing into the West Coast of Canada then
flows south into the Pacific off the Mexican West Coast. Once the flow
leaves the Rex Block, it can finally make some significant progress to
the east. An example diagram of the Rex Block is shown:

http://www.theweatherprediction.com/habyhints/178/


[I wonder how he missed the relationship with N/S systems and tornadic
cells.
I suppose it takes all sorts.]

*******

The Omega Block = L-H-L.
Air over the Southwest U.S. is forced to the north into Canada and
then back south into the Southeast U.S. by the huge high-pressure
ridge in the center of the country. The high pressure covers such a
broad latitude that the west to east air flow has difficulty going
around the high.

[Why doesn't it just go TO the high?]

....The region under the omega block experiences dry weather and light
wind for an extended period of time while rain and clouds are common
in association with the two troughs on either side of the omega block.
Omega blocks make forecasting easier since you can pinpoint areas that
will be dominated by dry or rainy weather for several days. The right
side of the omega block will have below normal temperatures (due to
CAA) while the region to the left will have above normal temperatures
(due to WAA.)

http://www.theweatherprediction.com/habyhints/144/