03/623 AM.
A major and long lasting heat wave is expected to persist through all of next week with dangerously hot temperatures. Clouds and dense fog are expected portions of the coastal waters this morning, likely reoccuring again tonight into Sunday morning.
(tdy-Tue), 03/107 PM.
The forecast through the coming week has really not changed at all as strong high pressure will maintain its grip over the region. Adding to this is the 2-4mb offshore gradient which is the main driver pushing this heat all the way to the coast. Ensemble gradient forecasts indicate a very slow onshore trend, basically less than a half millibar per day. So at least in the short term, cooling will be negligible. And even in areas that do cool slightly it really won't be perceivable. With this in mind the heat advisory for areas north of Pt Conception has been extended through Wednesday evening. And all other heat hazards remain in place through at least Thursday. There will be a few records this week, mainly near the coast as most inland areas are not quite reaching record territory.
(Wed-Sat), 03/106 PM.
The hot weather will continue all of next week with a very slow cooling trend, (1-2 degrees per day), and mainly just near the coast. Cooling for interior areas will won't begin until Friday so there is a 20-30% chance that at least some heat advisories will be needed on Friday. More significant and widespread cooling is expected next Saturday and continuing into early the next week. Recent model trends are indicating at least a 20-30% chance of some showers next weekend based on the latest ensemble tracks of Hurricane Rachel. Some increasing swells from Rachel are possible as early as mid week.
03/1734z.
At 1614Z at KLAX, there was no marine layer. There was a very weak surfaced based inversion with a top at 1300 ft and a temp of 31 C.
High confidence in VFR TAFs for all sites except for KSBP & KSMX. Chances of V/LIFR conds between 04/08Z-16Z: KSBP/KSMX (15%).
KLAX, High confidence in VFR TAF. E-SE wind should shift W around 03/20Z (+/- 1hr). East wind component likely a touch stronger tomorrow morning peaking 04/12Z-18Z nearing 7-8kts.
KBUR, High confidence in VFR TAF. No wind issues expected.
03/719 AM.
Generally quiet conditions expected across the coastal waters through the forecast period. Localized Small Craft Advisory (SCA) gusts may occur each afternoon and evening between Point Conception and San Nicolas Island, off the coast of Point Dume, and across the San Pedro Channel.
Ca, Extreme Heat Warning in effect until 8 PM PDT Thursday for zones 38-87-88-349>358-362-366>375-548-550. (See LAXNPWLOX). Heat Advisory in effect until 8 PM PDT Wednesday for zones 341>345-347-348. (See LAXNPWLOX). PZ, NONE.
