31/232 PM.
Dangerously hot temperatures are expected through this weekend, with potential for significant heat impacts. Some cooling is expected next week, but temperatures will remain above normal. Dangerous surf and rip currents are expected at many of the beaches this weekend, as a result of swells from a tropical cyclone located west of Mexico.
(tdy-Mon), 31/1258 PM.
Today and tomorrow are expected to be the hottest days in this heat wave as 500mb heights approach a rarely seen 600dam. If there is any good news in this scenario is that onshore gradients are expected to remain at least lightly onshore, allowing at least a light seabreeze to bring in some cooling ocean air inland by afternoon. Also a positive is that monsoon moisture is not expected to be a factor so it won't feel quite as sticky as last weekend. But even with those factors, temperatures will still be dangerously hot, especially away from the immediate coast, with highs 5-10 degrees above normal. It's highly recommended that any outdoor activities be completed before 9 am and or after 7pm. And always have a source of hydration. And keep in mind, since sea surface temperatures are in the 70s south of Pt Conception, overnight lows will continue to much warmer than normal, mostly in the mid 60s to mid 70s, limiting overnight cooling in dwellings within air conditioning. Saturday will be peak heat day in most areas with highs around 107 in the western San Fernando Valley, mid 90s downtown, and mid 80s to low 90s in the intermediate areas between the coast and the valleys.
Winds will mostly be under 15 mph, except some evening Sundowner winds across southwest Santa Barbara County up to 35 mph and up to 30 mph in the desert.
A large south swell from Tropical Cyclone Genevieve will further enhance large wave and potentially deadly rip currents for some area beaches.
(Tue-Fri), 31/1255 PM.
The slow cooling trend will continue into next week, though temperatures will still be 3-6 degrees above normal. In addition, monsoon moisture may return by the middle part of next week, which will limit overnight cooling and keep humidities higher than normal. Therefore, heat hazards are likely at times next week.
31/1919z.
At 1746Z at KLAX, the marine layer was around 600 feet deep. The top of the inversion was 3200 feet with a temp of 28 degrees Celsius.
High confidence in VFR conds for KPRB, KBUR, KVNY, KPMD, KWJF.
Low confidence in TAFs for KSBP, KSMX and KSBA. There is a 20-30% chance of low clouds at these sites, and in this case 40% chance of LIFR conds overnight.
Low to moderate confidence in KOXR, KCMA and the LA Coastal sites. If low clouds affect these sites, IFR to LIFR conds are likely. The timing could be off by at least +/- 2 hours, and CIGs could form and dissipate at times between around 06Z to 15Z.
KLAX, Low to moderate confidence in the 18Z TAF. The timing of flight cat changes may be off +/- 2 hours from TAF, and lowest cigs may be off +/- 200 feet. No significant east wind component expected.
KBUR, High confidence in the 00Z TAF with VFR conds expected.
31/107 PM.
For the Outer Waters, Small Craft Advisory (SCA) winds and seas will occur through this weekend before beginning to subside early next week. Winds will generally peak at around 30 knots but occasional gusts to 35 knots will be possible, mainly during the evening hours through Saturday.
For the Inner Waters north of Point Sal, there is an 60-80% chance of SCA winds each afternoon and evening through Saturday.
For the Inner Waters south of Point Conception, there is a 40% chance of SCA winds each afternoon and evening through this weekend over the western one-third of the Santa Barbara Channel.
Seas of 7-10 feet will impact the outer waters into this weekend, due to a combination of long-period southerly swell from a distant tropical cyclone and shorter- period northwesterly swell/wind- waves caused by the moderate to locally strong NW winds. As a result, steep, hazardous seas will be common, especially over the outer waters, extending to nearshore waters off the Central Coast.
31/158 PM.
Distant Tropical Cyclone Genevieve is generating S-SE swells that will continue to affect the beaches into this weekend. A High Surf Advisory remains in effect for the south facing beaches of LA County, with a Beach Hazards Statement for the Ventura Coast northward to the Central Coast. In LA County, in spite of lower wave heights, south facing beaches are still seeing frequent, strong and hazardous rip currents so will leave the High Surf Advisory in effect there. For Ventura County (and SBA South Coast) surf heights are low enough and rip currents mainly moderate. Further north, strong rip currents are likely along the south to southwest facing beaches of the Central Coast.
Use extra caution if you are at the beach, and be sure to ask lifeguards if and where it is safe to swim.
Please reference the Coastal Hazard Message for details on High Surf and Coastal Flood Advisories, as well as Beach Hazards Statements. Dangerous rip currents will be of particular concern this weekend.
Ca, Extreme Heat Warning in effect until 5 PM PDT Saturday for zones 38-88-343>345-351>353-355>358-368>376-378-379-381>383-548. (See LAXNPWLOX). Coastal Flood Advisory in effect until 3 AM PDT Saturday for zones 87-354-362-366. (See LAXCFWLOX). High Surf Advisory in effect until 5 PM PDT Saturday for zones 87-362-366. (See LAXCFWLOX). Beach Hazards Statement in effect through Saturday afternoon for zones 340-346-349-350-354-356. (See LAXCFWLOX). Heat Advisory in effect until 5 PM PDT Saturday for zones 341-342-347>350-354-362-366-367-377-380. (See LAXNPWLOX). PZ, Small Craft Advisory in effect until 3 AM PDT Saturday for zone 645. (See LAXMWWLOX). Small Craft Advisory in effect until 5 PM PDT Saturday for zones 670-673-676. (See LAXMWWLOX).
