SPC 1730Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1119 AM CST Sun Dec 27 2020 Valid 281200Z - 291200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Isolated thunderstorms will be possible on Monday along the coast of southern California. ...Discussion... Split flow aloft is expected across the U.S. Monday, as a northern-stream trough shifts across the Great Lakes and Northeast, while a southern-stream trough/low shifts inland over California and then across the Intermountain West. At the surface, a weak/fast-moving cold front will cross the Northeast/New England, while a Pacific front shifts across the Southwest. While most of the country will remain stable, precluding thunder potential, cold air/steep lapse rates aloft associated with the low moving onshore may provide enough instability to support a few lightning flashes near or just off the southern California coast. This activity should diminish as the upper system passes overnight. ..Goss.. 12/27/2020
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