Severe Weather Threat Day 3 Sun Sep 15

An Upper Ridge Will Be Prevalent Over The Southeast Quadrant Of The Conus Sunday...While A Progressive Belt Of Amplified Westerlies
Exists Over Canada And The Northern Third Of The Conus. In
Particular...An Upper Trough Will Continue To Amplify/Spread
East-Southeastward Over The Northeast States And New England...While An Additional Trough Moves Inland And Overspreads The Pacific Northwest Sunday Night/Early Monday.

South-Central Plains...

Near A Southeastward-Moving Front...At Least Widely Scattered Tstms
Are Expected To Develop/Increase Sunday Afternoon Within A
Southwest-Northeast Oriented Corridor Across The Region. Although
Vertical Shear Will Be Modest /25-30 Kt Of Effective Shear/...Frontal Uplift And Relatively Strong Heating With Upwards Of 750-1250 J/Kg Mlcape South Of The Front Could Allow For A Couple Of Severe Tstms Sunday Afternoon/Early Evening. Localized Downbursts Would Be The Main Risk Given This Scenario...Potentially Including Parts Of Ks/Northern Ok.

Pacific Northwest...

While Only A Relatively Modest Amount Of Destabilization Is Currently Expected Across The Region...Sufficient Moisture In The Presence Of Steeping Lapse Rates And Ample Forcing For Ascent/Strengthening Vertical Shear Suggest That Some Stronger/Possibly Severe Tstms Could Occur Sunday Afternoon/Evening. This Could Include Portions Of East-Central/Northern Ore Into Southern Wa.

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