26/1043 PM.
A low pressure system will bring cool temperatures and a chance of drizzle or light showers, as well as gusty winds to the beaches, mountains, and deserts through Thursday. A warming trend will begin Friday and continue into next week.
(tdy-Fri), 27/915 AM.
***UPDATE***
Very little has changed with the weather pattern this week so the forecast remains more or less the same. This is still a low predictability pattern with the upper low moving slowly south and wobbling as it goes. Scattered light showers are still expected but where those develop will be a game time decision. Best chances are in the mountains with minimal, if any, impacts. For most people in the four county area the weather elements that will be most impactful will be the cooler than temperatures (5-15 degrees below normal) and gusty winds at times in the afternoon. The low is moving a little slower than expected yesterday so shower chances may hold off until Thursday, especially south of Pt Conception.
***From Previous Discussion***
An unusual for this time of year cool (555 dam) will spin over the Sacramento area Today and Thursday. This is a little different that ydy's forecast which had the upper low moving southward. This means that the coldest most unstable air will stay to the north of the area and will reduce the chc of a stray shower or isolated TSTM. It will, however, keep the fairly strong westerly upper flow over the area which will make today a little windier than previously thought. The weather for the next two days will be much more like Portland weather than Srn CA. Look for periods of clouds, periods of sunshine and periods of partly cloudy. It will be breezy, esp along the csts and in the Antelope Vly. There is a slight chc of a shower esp over the mtns and the Central Coast. The chc of a TSTM is not zero, but with the upper low further north the chc is under 10 percent. One this is guaranteed: cool temps. Max temps will only be in the 60s today across the csts and vlys or 3 to 6 degrees blo normal for the csts and 8 to 12 degrees over the vlys. The mtns and far interior will be even cooler with max temps coming in 15 to 20 degrees blo normal. Thursday's max temps will change little.
The upper low will move out overnight Thursday and a weak ridge will move into the state. Hgts which were near a January like 560 dam will rise quickly to 574 dam. Skies will be mostly clear save for the chc of some morning stratus across the Central Coast. The combination of rising hgts and copious sunshine will produce 3 to 6 degrees of warming across the csts and vlys and 5 to 10 degrees further inland.
(Sat-Tue), 27/1210 AM.
Things will be much warmer during the extended forecast. NW flow will develop on Saturday and then a weak flow pattern with a slight cyclonic bent will cover the state from Sunday to Tuesday. The diurnal sfc flow will be a little weaker than usual for late May and Early June. This will likely result in a night through morning low cloud pattern for the csts and some lower vlys, but with sunny skies developing by late morning. There will be a 4 day warming period with the csts/vlys seeing 3 to 6 degrees of warming on Saturday; 1 to 2 degrees on Sunday; 2 to 4 degrees Monday and finally another 1 to 2 degrees Tuesday. Most max temps will reach normals either Sat or Sun and then all sites will be above normal on Mon and Tue. Tuesday's vly highs will be in the mid 80s to lower 90s.
27/0917z.
At 0832Z at KLAX, the marine layer was 5200 ft deep. The top of the weak inversion was at 7000 ft with a temperature of 4 C.
Moderate confidence in TAFs. SCT-BKN025-050 conds are likely at all sites through the period.
KLAX, Moderate confidence in TAF. Conditions will likely vary between SCT-BKN025-050 through the period. Any east wind component will be AOB 6kt.
KBUR, Moderate confidence in TAF. Conditions will likely vary between SCT-BKN025-050 through the period.
27/724 AM.
Buoy observations indicate winds have significantly diminished across the coastal waters. Small Craft Advisory (SCA) conditions are expected to linger through this evening (especially beyond 30 NM from shore). Conditions will remain below advisory levels on Thursday, with the best chance for showers (60-70%) north of Point Conception. SCA conditions will return Friday afternoon through the weekend - could reach into the inner waters at times.
Ca, High Surf Advisory in effect until 11 PM PDT this evening for zones 340-346. (See LAXCFWLOX). PZ, Small Craft Advisory in effect until 11 AM PDT this morning for zone 645. (See LAXMWWLOX). Small Craft Advisory in effect until 11 PM PDT this evening for zones 670-673-676. (See LAXMWWLOX).
