SPC 0830Z Day 3 Outlook
Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0113 AM CST Mon Dec 07 2020 Valid 091200Z - 101200Z ...NO THUNDERSTORM AREAS FORECAST... ...SUMMARY... Thunderstorms are not expected on Wednesday. ...Synopsis... An upper ridge will shift eastward across the central and into the eastern CONUS on Wednesday. At the surface, high pressure will persist over much of the country, and continental trajectories will result in dry and stable conditions. A shortwave trough will dig across the Pacific Northwest and merge with the upper low off the southern CA/northern Baja coast. This larger-scale trough will develop eastward across the western U.S., extending from the northern Rockies to AZ and northwest Mexico by 12z Thursday. Strong southwesterly deep layer flow will spread across northwest Mexico and southern AZ/NM, with midlevel moisture increasing toward the very end of the period. Showers will likely increase across parts of AZ/NM after 00z, however meager instability will limit thunderstorm potential. ..Leitman.. 12/07/2020
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