US Extended Forecast thru Dec 5

Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
Valid 00Z Fri Nov 29 2013 - 00Z Sun Dec 01 2013

A rather tranquil weather pattern is setting up over the U.S. for the
first half of the holiday weekend.

The storm that raised havoc on travelers along the Eastern Seaboard earlier this week has lifted well into Canada...and the brisk conditions left in the storm's wake should begin to diminish as gusty winds relax and temperatures gradually start to moderate.

A weak clipper system will trigger light snow showers across the Great Lakes Thursday night into Friday morning...with some heavier
bands expected downwind of the Lakes.

The Lakes should then see a bit of a break in activity until another weak system drops into the Upper Great Lakes on Saturday.

In the southern tier...cool northeasterly flow over relatively warm ocean waters should bring light showers into Florida's Atlantic Coast...while a closed low spinning out in the Pacific might clip Southern California with extremely light precipitation.

Finally...impulses of energy rippling through the flow aloft should foster light showers along the favored slopes of the Washington Cascades and Northern Rockies the next few days.

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Extended Forecast Discussion
Nws Weather Prediction Center College Park Md
Valid 12z Sun Dec 01 2013 - 12z Thu Dec 05 2013

...Overview...

A Broad-Scale Trough Will Prevail Across The Lower 48 During This
Medium Range Period--Characterized By An Arctic Intrusion--Coupled
With A Significant Upper-Level System Migrating Across The Pacific
Northwest-Northern Rockies Through Day 6 (Wednesday)...And The
North Central Plains Day 7 (Thursday).

Downstream From The Rio Grande Valley Eastward To The Southeast Coast...The Forecast Will Become A Challenge (Monday And Tuesday) As The Base Of This Broad Upper-Level Trough Becomes Entrained With Confluent Southern Stream Flow And Embedded Energy Originating In Baja California And The Gulf Of Mexico.

...Preferences...

The 28/00z Ecmwf Solution Was The Model Of Choice Today...With The 28/00z Naefs/Ec Ensemble Means In Good Support Of A Digging...And Deepening Cold Pool/Upper-Level Trough In The Great Basin From Day 5 Onward...And A Coastal Wave Developing Off The Southeast Coast.

...Sensible Weather Highlights...

Continued With Previous Forecasts For Low/High Temperatures To Be 20+ F Degrees Below Normal Within This Arctic Airmass From The West Coast Into The Great Basin And Rockies.


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