Severe Weather Threat Day 1 Sat Apr 20

Broad Cyclonic Flow Will Continue Over The Lwr 48 Through Sun.

The Trough That Affected In The Cntrl And Ern States In Recent Days Will Further Deamplify As It Progresses Farther Ne Across Ern Que And The Canadian Maritimes Today...While Shortwave Impulse Now Over Bc Moves Ese Toward The Pac Nw. A Weaker Disturbance Now Over Ut Should Continue Ese To Ern Nm By Eve...And Into N Tx Early Sun.

Relatively Dry...Cool Conditions Will Prevail Over Most Of The Conus
At Lwr Lvls. An Exception Will Be S Fl...Where Warm...Moist Air Will
Persist Ahead Of Weakening Cold Front Associated With Trough
Departing The Nern States.


Upr Divergence In Right Entrance Region Of A Jet Streak Crossing The Nern Gulf Of Mexico Today May Promote Elevated...Post-Frontal
Convection/Possible Storms Over N Fl And The Adjacent Cstl Waters
Through This Eve. Farther S...Glancing Influence Of Same Impulse May Enhance Development Of Surface-Based...Diurnal Storms Along
Sea-Breeze Boundaries And Possibly Along Front Over The Srn Third Of The State. While A Strong Wind Gust Or Two Cannot Be Ruled
Out...Weak Buoyancy/Shear Should Keep Any Such Risk Brief/Isold.

Nrn-Cntrl Rckys/High Plns...

Despite Limited Moisture...Strong Sfc Heating Of The Higher Terrain
And Cool Mid-Lvl Temps Will Promote High-Based...Diurnal
Convection/Sctd Storms In Cyclonic Regime Over The Rckys...With The Activity Then Spreading Ese Across The Adjacent High Plns.
Inverted-V Thermodynamic Environment And Moderate Mean Flow May Yield Gusty Sfc Winds Before The Convection Diminishes With Sunset.

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