Ation Discussion Below,
Our typical marine layer low clouds have been patchy and slow to spread inland in areas tonight, likely due to lingering mid-level moisture brought here by southerly flow aloft around a large upper level ridge over the southern U.S. Locally, we continue to be sandwiched between ridges to our northwest and east, low pressure to our southwest, and broad troughing over the northern half of the country. This has lead to our present warm, somewhat humid but otherwise unremarkable weather.
Low clouds that have managed to move inland tonight will clear out by mid-morning, followed by mostly clear skies except for isolated cumulus popping up over the mountain ridges in the afternoon. Above average morning low temps will turn to above average afternoon high temps again today, though today is expected to be a tad cooler than yesterday in most areas.
Conditions will be fairly similar day to day through at least mid next week, with only minor trends in temperature and depth and extent of the nightly/morning low clouds. Temperatures continue to cool slightly between today and Sunday for areas except the deserts, which will see similar temperatures. This will be followed by another mild warm up for Monday and Tuesday. Through this period, despite minor day to day changes, high temperatures will range from a few to about 5 degrees above average for coastal regions to 5 to 10 degrees above average for far inland areas, including the mountains and deserts. Low temperatures will similarly be 5 to 10 degrees above average most place, with parts of the mountains and deserts seeing lows up to about 15 degrees above average.
The somewhat messy flow pattern aloft is replaced with weak low pressure Wednesday, and temperatures will start to cool off. This trend will continue through late next week as a deeper trough moves in from the west. Among the global ensembles there are fairly significant differences in the strength of troughing aloft, which would affect the extent of cooling locally. This would likely bring temperatures at least back to around average, with the National Blend of Models suggesting high temperatures 5 to locally 10 degrees below average for late next week. This would also lead to a deepening of the marine layer, with clouds spreading further inland during nights and mornings mid to late next week.
High temperatures for the weekend into early next week will generally range from a few degrees above average near the coast to 5 to 10 degrees above average for the mountains and deserts with some slight day to day differences. Moderate HeatRisk, heat- related impacts affecting those sensitive to heat, will continue for the deserts through next Wednesday. Marine layer low clouds will spread into portions of the western valleys during the nights and early mornings, with day-to-day variations. A cooling trend with a deepening marine layer will follow mid to late next week.
For extreme southwestern California including Orange, San Diego, western Riverside and southwestern San Bernardino counties,
, Updated Aviation Discussion Below,
Our typical marine layer low clouds have been patchy and slow to spread inland in areas tonight, likely due to lingering mid-level moisture brought here by southerly flow aloft around a large upper level ridge over the southern U.S. Locally, we continue to be sandwiched between ridges to our northwest and east, low pressure to our southwest, and broad troughing over the northern half of the country. This has lead to our present warm, somewhat humid but otherwise unremarkable weather.
Low clouds that have managed to move inland tonight will clear out by mid-morning, followed by mostly clear skies except for isolated cumulus popping up over the mountain ridges in the afternoon. Above average morning low temps will turn to above average afternoon high temps again today, though today is expected to be a tad cooler than yesterday in most areas.
Conditions will be fairly similar day to day through at least mid next week, with only minor trends in temperature and depth and extent of the nightly/morning low clouds. Temperatures continue to cool slightly between today and Sunday for areas except the deserts, which will see similar temperatures. This will be followed by another mild warm up for Monday and Tuesday. Through this period, despite minor day to day changes, high temperatures will range from a few to about 5 degrees above average for coastal regions to 5 to 10 degrees above average for far inland areas, including the mountains and deserts. Low temperatures will similarly be 5 to 10 degrees above average most place, with parts of the mountains and deserts seeing lows up to about 15 degrees above average.
The somewhat messy flow pattern aloft is replaced with weak low pressure Wednesday, and temperatures will start to cool off. This trend will continue through late next week as a deeper trough moves in from the west. Among the global ensembles there are fairly significant differences in the strength of troughing aloft, which would affect the extent of cooling locally. This would likely bring temperatures at least back to around average, with the National Blend of Models suggesting high temperatures 5 to locally 10 degrees below average for late next week. This would also lead to a deepening of the marine layer, with clouds spreading further inland during nights and mornings mid to late next week.
131800z, Coast/Western Valleys, Low clouds have cleared out of the western valleys and most of the coastal areas (including all TAF sites) this morning, though clouds look to stick to the beaches and immediate coastline through the late morning and into the afternoon hours. Low clouds fill back in beginning around 00-03z Sunday with bases initially around 900-1200ft MSL, eventually settling largely below 1000ft by 09z. Similar inland extent as this morning, with scattering back to the beaches by 15-16z Sunday.
Mountains/Deserts, VFR conditions are expected through Saturday with high clouds AOA 10 kft MSL. Gusty onshore winds through San Gorgonio Pass into the Coachella Valley bringing gusts 20-25 kts this afternoon/evening.
No hazardous marine conditions are expected through Wednesday.
Elevated surf and strong rip currents continue at area beaches into next week. Surf of 3-6 feet and sets to 7 feet are expected at south- facing beaches. San Diego County Surf will be slightly lower but, hazardous swimming conditions with high rip current and longshore current risk will still exist. See the Beach Hazards Statement for more details.
Ca, Beach Hazards Statement through Monday evening for Orange County Coastal Areas-San Diego County Coastal Areas.
PZ, Beach Hazards Statement through Monday evening for Coastal Waters from San Mateo Point to the Mexican Border and out to 10 nm.
