27/244 AM.
Very hot conditions will dominate the week, with a high risk of heat-related illness. Isolated showers and thunderstorms are possible today and Friday. Significant cooling is likely by Sunday or Monday.
(tdy-Sat), 27/314 AM.
Dangerously hot and muggy conditions will again dominate the weather today and Friday. Mid and high level moisture has moved into the area from decaying tropical systems off Mexico so there will be an increase in clouds with a small chance of an isolated shower pretty much anywhere in the southwest California, though higher elevations will have a slightly higher chance since any drops will be evaporating quickly through their path to the surface. Also can't rule out an isolated clap of thunder, though hi res models are focusing most of the instability farther north in the state.
Temperatures the next couple days will remain hot, but the addition of clouds and possibly some light showers does introduce an element of uncertainty into the forecast, especially today as clouds are likely peaking today. Most of the forecast models are indicating 1-6 degrees of cooling today, with the bigger decreases across the interior, while coastal areas actually rise 1-3 degrees over yesterday. This is a fairly common scenario when tropical moisture moves into the area during a heat wave so confidence is relatively high that the models are on the right track with the temps. With less clouds likely Friday some rebound in temps inland is likely, while coastal areas start to cool as onshore flow returns.
(Sun-Wed), 27/331 AM.
A steady cooling trend will begin no later than Saturday and continue through Monday with high temperatures decreasing by about 5 degrees each day. By early next week highs should be very close to normal and even possibly a few degrees below normal as a trough develops over the Pac NW. By around the middle of next week there will be another tropical system moving west off the coast of Mexico that could introduce some additional moisture and shower chances locally, but temperatures should be close to normal levels for this time of year.
27/0556z.
At 0555Z at KLAX, there was no marine layer. The top of the inversion was 2000 feet with a temperature of 33 degrees Celsius. High confidence in the 06Z TAF package. VFR conditions are expected for all sites through the period as increasing high clouds tonight are expected to inhibit any stratus formation. However, there is a 10% chance of low CIGs forming along some of the coastline, most likely along the Central Coast. If restrictions were to occur, LIFR are expected.
KLAX, Moderate to high confidence in the 06Z TAF as VFR conditions are expected through the period. KBUR, High confidence in the 06Z TAF as VFR conditions are expected through the period.
26/759 PM.
For the Outer Waters, moderate to high confidence in current forecast. Through Monday, there is high confidence in Small Craft Advisory (SCA) level winds continuing along with steep, short period seas approaching SCA levels. Additionally, there is a 30% chance of Gale force winds on Sunday around Point Conception.
For the Inner Waters north of Point Sal, moderate confidence in current forecast. Through Sunday, there is a 40-60% chance of SCA level winds each afternoon and evening. On Monday, high confidence in winds and seas remaining below SCA levels. Steep, short- period, seas can be expected through the week.
For the Inner Waters south of Point Conception, moderate to high confidence in current forecast. For a majority of the southern Inner Waters, high confidence in winds and seas remaining below SCA levels through Monday. The only exception will be the western half of the Santa Barbara Channel where there is a 60-80% chance of SCA level winds during the afternoon and evening hours Thursday through Monday. Steep, short-period, seas can be expected through the week.
26/824 PM.
Southerly swell from post-tropical storm Iselle is moving through the coastal waters and is expected to continue through Thursday. Swell heights of 3-5 feet with a period of 11-12 seconds can be expected, producing elevated surf and dangerous rip currents along south- facing beaches of Ventura and LA counties. Therefore, a BEACH HAZARDS STATEMENT is in effect through 11 PM Thursday.
Ca, Extreme Heat Warning in effect until 8 PM PDT Friday for zones 38-87-88-349>358-362-366>376-378>383-548. (See LAXNPWLOX). Beach Hazards Statement in effect through this evening for zones 87-354-362-366. (See LAXCFWLOX). Heat Advisory in effect until 8 PM PDT Friday for zones 341>345-347-348. (See LAXNPWLOX). Red Flag Warning in effect until 3 PM PDT Friday for zones 345-353-375>380. (See LAXRFWLOX). PZ, Small Craft Advisory in effect until 3 PM PDT Friday for zones 670-673-676. (See LAXMWWLOX).
