01/134 PM.
Cool and unsettled weather is expected through this evening with low snow levels and gusty winds. Wednesday is expected to be dry but with continued cooler than normal temperatures. Showers are again possible Thursday, mainly south of Point Conception as another upper low moves through the area. Dry weather is expected from Friday through at least early next week with significant warming over the weekend. By Sunday high temperatures will be 5 to 10 degrees above normal.
(tdy-Fri), 01/210 PM.
An upper low is moving into the interior of northern California with some showers well ahead of it that have dropped some light rain across parts of the Central Coast and some light snow over the Grapevine region. With the flow aloft strongly from the north the Transverse range is preventing the showers from reaching the valleys and coastal areas south of Pt Conception, however those areas will be experiencing some very gusty west to northwest winds through the evening and wind advisories are in effect. Showers will taper off overnight as the upper low moves into AZ and the air mass briefly dries out.
Wednesday is expected to be dry and cool with some gusty northwest winds at times. Hi temperatures will range from 5-15 degrees below normal. Coolest across the interior.
Another batch of colder air aloft will move into the existing trough across interior California on Thursday which will increase instability and provide a favorable environment for showers and possibly even an isolated thunderstorm, but this time mainly south of Pt Conception. 12z ensembles we're not quite as on board with this idea as earlier runs so if these trends continue shower chances for Thursday may have to be lowered. Overall amounts will be light, but could be some brief moderate to heavy rain, with the best chances for that across southeastern LA County where the best convergence and instability will be. And once again snow levels will be on the lower side, generally 3500-4500 feet.
On Friday the main trough finally exits to the southeast with what is expected to be the beginning of an extended period of dry weather with warming temperatures.
(Sat-Tue), 01/225 PM.
Models continue to advertise high pressure building over the area this weekend leading to a significant warming trend, bringing temperatures up to a few degrees above normal Saturday and 4-8 degrees above normal Sunday, with warmer valley highs close to 90 and coastal areas upper 60s and 70s.
A weak trough passing well to the north Monday will slow down the warm up briefly before a stronger ridge moves in Tuesday and Wednesday with even warmer temperatures expected.
01/2352z.
Around 00Z, there was no marine layer or inversion.
High confidence in widespread VFR conds, and moderate confidence in winds. Gusty W to NW winds will affect most terminals through the period, with relative lulls possible during the overnight hours before increasing again in the morning Wednesday. There is a moderate chance of moderate to locally strong LLWS and turbc through 06Z, then low to moderate LLWS and turbc after 18Z.
There is a 20-30 percent chance of brief showers with MVFR cig/vsby conds through 08Z north of Point Conception. BLDU may create lower vis at KPMD and KWJF.
KLAX, High confidence in VFR conds and moderate confidence in winds, as gusty west winds will impact the terminal through most of the period, with relative lulls during the overnight hours. Low to moderate turbc and LLWS is possible through 06Z. No east wind expected.
KBUR, High confidence in VFR conds and moderate confidence in winds. There will be relative lulls in the winds overnight before increasing in the morning Wednesday. There is a moderate chance of moderate to locally strong LLWS and turbc through 06Z, then low to moderate LLWS and turbc after 18Z.
01/109 PM.
High confidence in the forecast inside the southern California bight versus the waters outside the bight. Marine weather conditions will deteriorate through tonight across the waters. Winds and seas will increase and build respectively across the coastal waters today and into tonight. Widespread GALES across are highly likely across the southern coastal waters by late this evening and continuing into late Wednesday night or early Thursday morning. There is a 30-40 percent chance of GALES extending into the northern and remaining outer waters at times through Wednesday evening.
After a chance of SCA conditions on Thursday, winds and seas will drop below SCA levels through Sunday.
Dense fog may develop this upcoming weekend, especially in the evening to morning hours, in response to a ridge building over the region.
Ca, Wind Advisory remains in effect until 2 AM PDT Wednesday for zones 87-88-350-354>358-362-366>375-381>383-548. (See LAXNPWLOX). Wind Advisory remains in effect until 9 PM PDT this evening for zones 340-341-346>348. (See LAXNPWLOX). Wind Advisory remains in effect until 9 AM PDT Wednesday for zones 349-351>353-376>380. (See LAXNPWLOX). High Surf Advisory in effect until 4 AM PDT Thursday for zones 354-362-366. (See LAXCFWLOX). PZ, Small Craft Advisory in effect until 3 AM PDT Thursday for zones 645-670-673. (See LAXMWWLOX). Gale Warning in effect until 3 AM PDT Thursday for zones 650-655-676. (See LAXMWWLOX).
