textproduct: Los Angeles

SYNOPSIS

09/206 AM.

Extreme heat and humidity will peak Today and Thursday with a high risk for heat illness. Isolated showers and thunderstorms are possible today as well, mainly over the mountains. Elevated surf and coastal flooding will linger into Thursday, but decrease in severity. Cooler and more normal conditions likely by Saturday.

LONG TERM (SAT-TUE)

09/206 AM.

Much more benign weather is on tap for the xtnd period. At the upper levels fairly flat flow will set up over the state through Monday with hgts near 588 dam. Starting Tuesday the flow tilts to the SW-NE and Srn CA finds itself between a PACNW low and a TX high. At the sfc there will be weak to moderate onshore flow to the east and weak morning offshore flow turning weakly onshore in the afternoon flow in the N/S direction.

The very warm sea sfc temps will inhibit low cloud formation but its likely some patchy low clouds will develop south of Pt Conception. The Central Coast will likely have better stratus coverage in the mornings.

Look for another 3 to 6 degrees of cooling and Saturday and another noticeable decrease in humidities. Most max temps will be a few degrees blo normal. Most csts/vlys south of Pt Conception will cool another 1 or 2 degrees on Sunday while a little increase in offshore flow across the Central Coast will bring 2 to 3 degrees of warming. Not much change slated for Monday with some additional cooling slated for Tuesday.

AVIATION

09/1742Z.

At 1710Z at KLAX, the marine layer depth was 600 feet with a very weak inversion to 2500 feet with a temperature of 32 degrees C.

High confidence in VFR conds for non-coastal TAFs.

Good confidence in VFR TAFs for remainder of sites. KSBP's transition to NW winds may be any time through 22Z.

KLAX...Good confidence in TAF. No significant east wind component expected.

KBUR...High Confidence in VFR TAF. Winds may remain S this afternoon and evening with no NW winds.

MARINE

09/856 AM.

Moderate confidence in winds and seas increasing to Small Craft Advisory (SCA) levels this afternoon, focused south and west of Point Sal and continuing through the weekend. Moderate confidence in winds expanding across all Outer Waters by Thursday, with local gusts to 20-25 knots this afternoon through evening. Winds and at times seas will likely exceed SCA levels into early next week, with a 20-30% chance of Gale Force winds Thursday evening, and again on Sunday.

Across the nearshore waters along the Central Coast, winds will locally reach SCA levels today, with more expansive gusty winds Thursday into early next week, when SCAs will likely be issued.

South of Point Conception, moderate confidence in SCA winds across the western half of the Santa Barbara Channel (locally eastern portions) each afternoon and evening into early next week. Thus, there is a 40-60% chance for SCAs to be issued each day, with highest chances this weekend. Local SCA gusts will be possible each afternoon-evening across the Santa Monica Bay and San Pedro Channel into early next week.

The southerly swell that has impacted the coastal waters over the last few days will continue to gradually subside today.

LOX WATCHES/WARNINGS/ADVISORIES

CA...Extreme Heat Warning in effect until 8 PM PDT Thursday for zones 38-87-88-340>358-362-366>375-548. (See LAXNPWLOX). Beach Hazards Statement in effect through Thursday evening for zones 87-349-350-354-362-366. (See LAXCFWLOX). PZ...Small Craft Advisory in effect from 3 PM this afternoon to 3 AM PDT Saturday for zones 673-676. (See LAXMWWLOX).