SPC 1630Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1002 AM CST Sat Dec 26 2020 Valid 261630Z - 271200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Thunderstorm potential will be negligible across much of the contiguous U.S. through early Sunday, except along coastal Washington this evening. ...Coastal WA... The next in a series of low-amplitude shortwave impulses, currently well west of OR, should approach coastal WA this evening. A zone of focused ascent attendant to this impulse in conjunction with steep low to mid-level lapse rates should yield a period of scattered low-topped convection approaching the coast. Scant buoyancy (SBCAPE below 250 J/kg) may support very isolated lightning flashes and this threat appears marginally sufficient for a 10-percent thunder area. ..Grams.. 12/26/2020
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