What is THIS?

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azsnowman
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What is THIS?

#1 Postby azsnowman » Mon Dec 13, 2004 7:34 am

OK....I've been following the weather for some time, a weather GENIUS I'm NOT, I know enough to get around BUT....what the heck is a REX BLOCK? This is from this mornings NAFD NWS/NOAA FLAG:

GFS AND ECMWF CURRENTLY SHOW THE LOW RETROGRADING TO OFF THE BAJA COAST BY SATURDAY WITH A REX BLOCK PATTERN OVER THE WEST COAST. THIS IS A MAJOR CHANGE FROM PREVIOUS RUNS. FOR NOW WILL GO WITH CURRENT MODEL CONSENSUS OF DRY WX FOR THE LATER PERIODS. DF

Dennis :?:
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TS Zack
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Re: What is THIS?

#2 Postby TS Zack » Mon Dec 13, 2004 8:09 am

Its when a Strong Low Pressure Trough usually cut-off sits in adjacent with a strong ridge. Creating a backwards S shape in the winds. Everything is forced around it causing a blocking pattern. The ridge is fixed to the north of the trough. They usually never move because the wind flow rotates around the backwards S.
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PurdueWx80
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#3 Postby PurdueWx80 » Mon Dec 13, 2004 10:09 am

Read wxguy25's discussion - he just posted about all types of blocking a couple of days ago. :) This looks to be a perfect example of a rex block.

http://www.geocities.com/usafrw/atmosbl ... ocking.htm
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azsnowman
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Re: What is THIS?

#4 Postby azsnowman » Mon Dec 13, 2004 8:05 pm

TS Zack wrote:Its when a Strong Low Pressure Trough usually cut-off sits in adjacent with a strong ridge. Creating a backwards S shape in the winds. Everything is forced around it causing a blocking pattern. The ridge is fixed to the north of the trough. They usually never move because the wind flow rotates around the backwards S.


Thanks for the info Zack....I can't ever remember seeing this Rex Block before, it threw me for a loop, which BTW is EASY these days LOL!

Dennis 8-)
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