textproduct: Los Angeles

SYNOPSIS

26/945 AM.

Very hot conditions will dominate the week, with a high risk of heat-related illness. Isolated showers possible Thursday and Friday. Significant cooling is likely over the weekend but it will remain warm.

LONG TERM (SAT-TUE)

26/304 AM.

The weekend will bring a much welcomed cooling trend. The trof will swing into the west coast and the upper high will be shunted all the way to Arkansas. Hgts will fall to 587 dam. Onshore flow will increase some and the marine layer along with morning marine layer stratus will make a comeback. Look for 3 to 6 degrees of cooling Saturday followed by an additional 4 to 8 degrees on Sunday. Vly temps in on Sunday will only be in the lower to mid 90s. The Central Coast will see the greatest cooling with highs in the upper 60s to mid 70s. Most highs on Sunday will be a few degrees blo normal.

The trof sharpens some on Monday lowering hgts to about 585 dam. The onshore flow will increase a little as well. This will lead to another 2 to 4 degrees of cooling with most areas coming in 3 to 6 degrees under normal. Look for vlys temps only in the upper 80s and lower 90s.

Little change is forecast for Tuesday as troffing will hold sway over the west coast.

The EC-AI mdl does not show any significant heat in the area through at least September 4th.

AVIATION

26/1638Z.

At 1600Z at KLAX, the marine layer was 500 feet deep. The top of the inversion was 2200 feet with a temperature of 32 degrees Celsius.

High confidence in 18Z TAF package. VFR conditions are expected for all sites through the period as increasing high clouds tonight are expected to inhibit any stratus formation.

KLAX...High confidence in 18Z TAF as VFR conditions are expected through the period.

KBUR...High confidence in 18Z TAF as VFR conditions are expected through the period.

MARINE

26/703 AM.

For the Outer Waters, high confidence in current forecast. Small Craft Advisory (SCA) level winds are expected across all of the Outer Waters through Sunday. Additionally, seas will hover near SCA levels through the week, including hazardous steep seas with building wave heights.

For the Inner Waters north of Point Sal, moderate to high confidence in current forecast. SCA level winds are expected during most afternoon to evening periods through the weekend. Steep choppy seas are 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 Sunday. The only exception will be the Western half of the Santa Barbara Channel where there is a 30-40% chance of SCA level winds during the afternoon and evening hours today then a 60-80% chance Thursday through Sunday during the same time frame. Choppy short period seas will persist through the weekend.

BEACHES

26/703 AM.

Southerly swell from Tropical Storms Iselle and Julio will move into the coastal waters today and continue through Thursday. Swell heights of 3-5 feet with a period around 14 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.

LOX WATCHES/WARNINGS/ADVISORIES

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 Thursday evening for zones 87-354-362-366. (See LAXCFWLOX). Heat Advisory in effect until 8 PM PDT Thursday for zones 341-347-348. (See LAXNPWLOX). Heat Advisory in effect until 8 PM PDT Friday for zones 342>345. (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 AM PDT Thursday for zone 645. (See LAXMWWLOX). Small Craft Advisory in effect until 3 AM PDT Friday for zones 670-673-676. (See LAXMWWLOX).