textproduct: Los Angeles

SYNOPSIS

20/939 AM.

Another heat wave is coming this week, peaking Thursday, but remaining well above normal into early next week. There is potential for major or extreme heat concerns for at least the next week.

LONG TERM (THU-SUN)

20/312 AM.

The upper high will stay put for Thu and fri. The high will strengthen some and hgts will bump up to 594 dam. Starting Saturday the high will migrate westward hgts, however, will remain around 594 dam. The onshore flow to the east will weaken some, but the bigger news is that the N/S gradient will turn offshore.

With minimal marine layer and weak offshore flow from the north Thursday will warm another 1 to 3 degrees. Triple digit heat will be common away from the coast with the warmest areas seeing max temps of 104 to 107 degrees. Heat advisories are likely for some inland areas and there is the possibility of heat warnings. The higher than normal hgts will also create a strong inversion which will keep overnight lows well above normal for many vly locations.

Current fcsts show an eddy with a deeper marine layer on Friday with some cooling possible.

More warming is likely next weekend as the high moves to the 4 corners area. This position will bring a chc of monsoon transport into the area and the potential for afternoon convection will be monitored.

AVIATION

20/1131Z.

At 0828Z at KLAX, the marine layer was 1000 ft deep. The top of the inversion was at 3000 ft with a max temperature of 26 C.

High confidence in VFR TAFs for KBUR, KVNY, KPMD, KWJF, and KPRB.

Low confidence in TAFs for KSBP, KSMX and KCMA with a 40 percent chc of IFR conds 13Z-16Z. A better chc of low clouds tonight but low confidence on arrival timing.

Moderate confidence in the remaining TAFs for KLAX, KSMO, KLGB, KSMX and KSBP where timing could be off by +/- 2 hours and cig hgts +/- 200 ft.

KLAX...Moderate confidence in TAF. There is a 30 percent chc of OVC008 cigs. VFR conds may arrive as late as 17Z. There is a 30 percent chc of BKN008 conds aft 21/09Z. No significant east wind component expected.

KBUR...High confidence in CAVOK TAF.

MARINE

20/218 AM.

Conditions are generally expected to remain below Small Craft Advisory (SCA) levels through Tuesday morning. Northwest winds will strengthen Tuesday, rising to SCA levels by Tuesday afternoon, and will likely continue through the rest of the week. Chances also increase for SCA level west to northwest winds in the western half of the Santa Barbara Channel during the same time.

A series of moderate period southerly swells will move through the waters through the week and likely beyond. These swells may impact south facing harbors, including the Port San Luis area.

LOX WATCHES/WARNINGS/ADVISORIES

CA...High Surf Advisory in effect until 11 PM PDT Tuesday for zones 87-354-362-366. (See LAXCFWLOX). Beach Hazards Statement in effect through Tuesday afternoon for zones 340-346. (See LAXCFWLOX). PZ...NONE.