May 22, 2013
Medium-Range Models Agree That The Large Polar Vortex Over Ern
Canada And Associated Trough Extending Swd Across The Ern U.S. Will Generally Predominate Through Day 6...With Accompanying Surface High Pressure E Of The Rockies Mitigating Appreciable Convective Potential.
Late In The Period...Hints Exist That A Short-Wave Trough Ejecting
Across The Wrn U.S. Will Occur In Conjunction With Some Ewd Shift Of The Ern U.S. Long Wave Trough.
As This Occurs...A Surface System Is Shown To Emerge Into The Central Conus Day 7 /Wed. 1-23/...Which Then Continues Ewd Across The Central And Ern U.S. Through Day 8.
While This Feature Could Support Some Nwd Return Of Moisture And
Thus Some Increase In Convective Potential Over The Srn States... The Likelihood That Ample Instability Would Evolve So As To Support Substantial Severe Weather Threat Appears Low.
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