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Feb 24th threat. Signal has been there for a while now


Typhoon Tip

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This system more or less marks the entrance into a teleconnector suggested very active pattern.   Will's thread covers much of that conceptually, but imo this can broken out one by one.  

 

18z GFS most aggressive run so far at 500mb, showing a potent vort max and suggestive NJ Model low.   

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Key to handling this will be the timing and amplitude of the blocking in eastern Canada associated with the arriving -NAO.   

 

At 24 hours, the impulse that goes on to capture a weak Miller A and converts it into a NJ Model low, is situate along and S of the western Aleutian archipelago, shown here.

 

gfs_npac_024_500_vort_ht.gif

 

Notice that down stream near and east of James bay, there is low amplitude negative anomaly at the time of this chart, above.   Now, bopping ahead to 132 hours, we see that region is replaced by positive anomalies, associate with an extreme west-based NAO-like blocking feature...

 

gfs_npac_132_500_vort_ht.gif

 

At that time the impulse that was originally up near the Aleutians can be seen just leaving the frame on the right edge of the chart, ...having been effectively forced S.  There some delicate work to get this to pan out.  2 primaries:  1, there needs to be decent handling of the block spatial-temporally;  2, the impulse leaving the upper MA needs to be strong enough to overcome some compression as it passes from the MV to off th MA. 

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Pretty funny how close the 18z GEFS are with the 12z Euro ensembles...almost a dead match on the evolution and track of the storm. GEFS are just a bit faster by 6 hours or so. Otherwise very similar having the low somewhere near or just south the benchmark overnight Sat night into early Sunday.

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Another weekend storm.  Very convenient for sleep patterns.  

 

Gonna be tough post 3/2 with an hour later on 0Z at night.

 

 

March 10th is daylight savings....we got a week longer than 3/2. I think we will be thankful too the way the first 10 days of March look at the moment.

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