SPC 1300Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0616 AM CST Mon Mar 08 2021 Valid 081300Z - 091200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... A few thunderstorms are possible along the Pacific Coast. ...Synopsis and Discussion... A stable continental air mass is currently in place from the southern Plains eastward/northeastward into the Mid-Atlantic and Northeast States. Western portion of this air mass is forecast to modify throughout the day as southerly return flow increases ahead of an approaching shortwave trough (currently moving through southern CA). Even with this strengthening return flow, low 60s dewpoints will likely only reach the far south TX Gulf Coast, keeping the airmass over the Plains stable. Farther west/northwest, a pair of shortwave troughs is expected to rotate around the parent upper low and into the Pacific Northwest. The first is expected to move over this morning with the second following late tonight/early tomorrow morning. Isolated thunderstorms appear possible within the frontal bands associated with these two shortwaves as well as the steep mid-level lapse-0rate environment expected to persist between the two systems. This thunderstorm potential will be confined to the immediate coastal areas of OR and northern CA where slightly better low-level moisture fosters meager buoyancy. A lightning flash or two is also possible from east-central OR into central ID as the lead shortwave move through. However, overall coverage is expected to remain less than 10%. ..Mosier.. 03/08/2021
There’s more click here.