May 20, 2013
A Large Trough Will Exit The Nern States Allowing Upper Heights To
Build Over The Midwest.
At The Surface...High Pressure Will Encompass The Ms Valley Ewd To The Coast.
Farther W...A Relatively Weak And Low-Amplitude Shortwave Trough
Will Progress Ewd Across Nm And Into The Srn Plains...Although
Models Do Differ On Precise Timing Of This Feature.
Regardless...Cooling Aloft And Moistening...As Well As Pockets Of
Heating During The Day Over Nm And W Tx...May Allow For Scattered
Weak Thunderstorms During The Day.
Overnight...A Swly Low Level Jet Will Transport Moisture Just Off The Surface Nwd In Advance Of The Wave...Likely Resulting In Weak Nocturnal Thunderstorms.
Elsewhere...A Strong Upper Trough Will Take Shape Across The Nwrn
Conus But Instability Will Not Be Enough For A Thunderstorm Area.
However...A Few Lightning Strikes Could Occur Over The Ocean.
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