May 20, 2013
Short-Wave Troughing -- Embedded Within The Larger-Scale U.S. Trough -- Is Forecast To Shift Quickly Newd Across The Upper Midwest And Upper Great Lakes Region Before Traversing Ern Canada.
However...The Main/Large-Scale Trough Is Expected To Remain
Stationary Across The Wrn And N Central U.S. Through The Period --
Reinforced By Digging Short-Wave Energy Dropping Ssewd Along The Troughs Wrn Fringe.
At The Surface...High Pressure Is Forecast To Prevail Across The
Central And Wrn U.S. In The Wake Of A Ern U.S. Cold Front...Expected
To Progress Gradually Ewd With Time. By The End Of The Period... This Front Should Extend From The Vicinity Of The New England Coast Swwd To The Wrn Gulf Of Mexico.
With A Lack Of Instability Progged To Exist Along And Ahead Of This
Front From The Mid South Newd...Weak Convection And Embedded
Low-Topped Thunderstorms Will Be Possible Across Portions Of The Wrn And Central Gulf Coastal Areas And Inland Roughly 200 Miles Or So.
However...Given The Aforementioned Meager Instability...Little If Any Severe Threat Is Anticipated.
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