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US Final Extended Weather thru Jan 26

Arctic Airmass Remains A Fixture In The East And Midwest During
The Medium Range Period.

Very Little Change From The Previous Graphics Concerning The Series Of Arctic Boundaries Expected To Migrate Southeastward Out Of South Central Canada And Spread Out Across The Great Lakes... Northeast And Southeast.

The Important Detail In The Graphics Will Be Exactly Where The
Succession Of Arctic Boundaries Settle Out And Modify Between
35n-40n And 85w-70w As Mid-Level Energy Tracks Through The Base Of The Cold Upper-Level Trough.

The General Trend Over The Last 2-3 Days Has Been Consistent With A Flatter Flow Pattern And Little To No Amplification Of The Upper-Level Flow As These Disturbances Pass Atop The Sloped Arctic Front(S).

In Other Words...'Suppressed' Disturbances Will Intensify Invof The Coastal Carolina And Race Out To The East Northeast...South/East Of The 40n 70w Benchmark.

The 06z Gefs/Operational Gfs Were Good Pieces Of Guidance To
Incorporate Into The Blend This Morning. In Particular...The
Operational 06z Gfs In The West And In The East...The 00z Gefs.
The Difference Between The 00z Gefs And 06z Gefs Mean Solution Was Subtle With Track/Intensity Of A Possible Coastal Wave...Days 6-7 Along The Mid Atlantic Coast Northward Into The Gulf Of Maine.

In The Central Section Of The Nation...The Trajectories Of The
Individual Surges/Front Will Allow For Greater Modification Of The
Arctic Airmass...And Consequently...Larger Diurnal Temperature
Swings...In The Central And Southern Plains Plains Are In The
Offing This Forecast Cycle.

A Breakdown Of The Upper-Level Ridge In The West Appears To Be On Track Day 3-5. Manual Graphics Favored A Blend Of The 00z Ecmwf Means And 06z Gefs Means.


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