SPC 1730Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1112 AM CST Thu Jan 21 2021 Valid 221200Z - 231200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... No severe weather is expected across the U.S. Friday. ...Synopsis... An upper low and attendant trough near coastal northern CA at the beginning of the period will pivot east/southeast through period, emerging over the Great Basin and much of the rest of the southwest U.S. by Saturday morning. Surface low pressure will develop over parts of CA into NV, bringing a Pacific front east/southeast across CA. Showers will accompany this system much of the period. Steepening lapse rates due to cooling aloft should result in sufficient instability to support a few thunderstorms around the San Francisco area and surrounding hills. Further east, broad, weak cyclonically-curved upper level flow will dominate east of the Mississippi River. A weak mid/upper shortwave trough over the southern Plains Friday morning will eject eastward across the lower MS Valley during the afternoon, and weaken as it continues east across the remainder of the Southeast. A weak surface cold front will reside near the Gulf Coast during the morning and slowly sag southward through Saturday morning. Showers and isolated thunderstorms will likely be ongoing Friday morning and could persist toward midday across parts of southern LA/MS. This activity will exist in a weakly unstable environment with any thunderstorm being undercut by the front, limiting any severe potential. ..Leitman.. 01/21/2021
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