Severe T-Storm US Outlook Sep 24

Day 1 Convective Outlook
Nws Storm Prediction Center Norman Ok
0741 Am Cdt Fri Sep 24 2010

Valid 241300z - 251200z

...No Svr Tstm Areas Forecast...

...Synopsis...
An Initial Shortwave Trough Over The Upper Great Lakes Will Progress Enewd /Along And N Of The Saint Lawrence Valley/ Through Early Saturday...While An Upstream Trough Now Over The Nrn Rockies Begins To Dig Sewd Over The Nrn/Central Plains Late In The Period. A Cold Front Accompanying The Lead Shortwave Trough Will Continue To
Provide A Focus For Thunderstorm Development Today...Primarily
Across Parts Of The Srn Plains And Ms Valley Where Low-Level
Moisture/Instability Will Be Greatest. Buoyancy Will Be Much More
Limited Farther Ne Along The Front Into The Mid-Upper Oh Valley As A
Result Of A Narrowing Moist Sector With Time...And Poor Midlevel
Lapse Rates. Damaging Winds Would Be A Minor Concern Across The Oh Valley Given The Forecasts Of 30-50 Kt Wswly Low-Midlevel Flow And Steep Low-Level Lapse Rates With Daytime Heating.
However...Marginal Thermodynamic Profiles With Small Cape And Warm Equilibrium Level Temperatures Will Be Somewhat Unfavorable For Lightning Production Within The Band Of Shallow Convection Along The Front.

Overnight...Low-Midlevel Ascent Will Increase Over The Central
Plains/Mid Mo Valley In Advance Of The Amplifying Midlevel
Trough...And On The Nose Of A Developing Swly Llj. A Narrow
Corridor Of Moisture Return Above The Surface Will Occur In
Conjunction With The Llj...Beneath A Plume Of Relatively Steep
Midlevel Lapse Rates. The Net Result Will Be An Environment
Supportive Of Elevated Thunderstorms Late Tonight...Some Of Which
Could Produce Marginally Severe Hail Given 500-1000 J/Kg Of Mucape
And Cool Temperatures Aloft.


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