US Final Extended Weather thru Jan 19

Used The 00z/12 Ecmwf For Days 3 Through 5 Across The Contiguous United States, And The 00z/12 Ecens Mean For Days 6 And 7 To Mitigate The Uncertainty In Synoptic Details Inherent To That Time Range.

Where The European Centre Guidance Differs From The Gfs And
Gefs Mean--Mainly With The Timing Of The Primary Arctic Wave
Crossing Southern Canada Day 4--It Is Supported By The Gem Global
And Ukmet.

The Pattern Is Slowing Evolving, With A Filling Of The Southwest Trough, A Weakening Of The Southeast Ridge, And A More Dominant Northern Stream Along The Canadian Border.

The Biggest Slug Of Synoptic Moisture Is Expected To Eject Across The Appalachians, Mid Atlantic, And Carolinas Early In The Period. Snow Or Some Ice Is Anticipated On The Northern Edge Of This Plume, Most Likely From The Central Appalachians To The Northern Mid Atlantic Region.

The West And North Central States Will Be Quite Dry In The New Flow Regime, With The Deep South Vulnerable To Another Wave Later In The Period.

The Heart Of The Arctic Air Is Still Slated To Be Contained North Of The Canadian Border, Though It Would Not Take Much Amplification Of Any Given Northern Stream Wave To Tap Some Of That Airmass Into The Northern Tier Of States East Of The Continental Divide.

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