Tag: spc

SPC 0100Z Day 1 Outlook Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0636 PM CST Sat Nov 23 2024 Valid 240100Z - 241200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Isolated thunderstorms will be possible this evening into tonight from northern California into parts of the Pacific Northwest, but no severe threat is expected. ...DISCUSSION... A powerful mid-level low, offshore from the Pacific Northwest, will move slowly southward across the eastern Pacific. Southwesterly mid-level flow will be in place across much of the western U.S. Thunderstorm development will be possible this evening into tonight from northern California into

SPC 1300Z Day 1 Outlook Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0641 AM CST Sat Nov 23 2024 Valid 231300Z - 241200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Severe thunderstorms are unlikely through tonight. ...Synopsis/Discussion... In mid/upper levels, the presence of a cyclone near the coastal Northeast, and progressive synoptic ridging moving eastward over the central CONUS, should contribute to keeping most of the lower 48 states too dry and/or stable in low/middle levels for thunderstorms. A substantial synoptic-scale trough is apparent in moisture-channel imagery from north-central BC south-southwestward, offshore from the Pacific Northwest and CA.

SPC 0100Z Day 1 Outlook Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0644 PM CST Fri Nov 22 2024 Valid 230100Z - 231200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Isolated thunderstorms may occur this evening from the coasts of Washington and Oregon southeastward into the northern Sierras, but no severe threat is expected. ...DISCUSSION... A mid-level shortwave trough will approach the West Coast this evening. A chance of thunderstorms will exist ahead of the trough in an area of steep mid-level lapse rates and strong large-scale ascent. The potential for thunderstorm activity will be from the coasts

SPC 1300Z Day 1 Outlook Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0642 AM CST Fri Nov 22 2024 Valid 221300Z - 231200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Severe thunderstorms are unlikely through tonight. ...Synopsis/Discussion... A well-amplified mid/upper-level pattern features synoptic-scale cyclones on either side of the CONUS: 1. In the East, the cyclone core is elongated west-southwest/east- northeast from WV to southern New England, occasionally exhibiting two centers at 500 mb. This cyclone should pivot offshore gradually, with a more consolidated center south of RI and east of NJ by 12Z tomorrow. Associated thunder tonight