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Dallas NWS says brrrrrrrrrrrrrrrrrrrrrrrrrrrr
12-15-2004, 10:34 AM
Post: #1
Dallas NWS says brrrrrrrrrrrrrrrrrrrrrrrrrrrr
Otherwise...significant Changes Will Be Made To The Extended
Forecast This Morning...as Temperatures For The Beginning Of Next
Week Now Appear As If They Will Be Much Colder Than What We Were
Previously Advertising. Medium Range Guidance From The Ecmfw/gfs And
Canadian Are In Good Agreement On A Continued Retrogression Of The
Southwestern U.s. Upper Low Over The Weekend...allowing A Stout
Split-flow Block To Develop Over The West Coast. Resultant
Downstream Amplification Of Troughing Over The Eastern U.s. Will
Provide A Very Favorable Mid-upper Flow Regime For Drawing Arctic
Air Southward Into The U.s. It Appears That Perhaps The Coldest Air
Of The Season Thus Far Will Be Moving Into The Area...following A
Strong Frontal Passage On Saturday Afternoon/evening. This Airmass
Originates In Northern Siberia...and Could Be Significantly Colder
Than The Current Airmass...but Much Of The Deep Cold Advection
Appears To Take Place To The East Of Texas. However...should The
Block Develop A Bit Further To The West Than Currently Progged...
This Airmass Would Spill More Directly Into Texas. We Will Offer A
Conservatively Warm Forecast Attm...but Temperatures On Sunday And
Monday May Need To Be Cooled Further In Future Forecasts.
Otherwise...we Have Added A Slight Chance For Rw/trw On Tuesday...
As Another Upper Low Approaches Texas From The West.

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