textproduct: Los Angeles

SYNOPSIS

06/746 PM.

Weak onshore flow will continue to bring limited low cloud cover to the coasts and coastal valleys each night through morning over the next several days as temperatures warm across the region. Interior temperatures will likely reach 100 degrees or higher across the interior valleys Tuesday through Friday. A Heat Advisory is in effect for non-coastal areas starting at 10 AM Tuesday and starting at 10 AM Wednesday for the Los Angeles County Inland Coast - including Downtown Los Angeles.

LONG TERM (FRI-MON)

06/246 PM.

Several items of concern continue into the extended forecast periods as well above normal temperatures are expected to linger into Friday and there will be a potential for some monsoonal moisture to work its way across the local area late in the weekend into early next week. While temperatures will moderate a bit over the weekend and heights aloft will weaken as the main area of high pressure centers itself across the northern Rockies, even warmer temperatures look possible across the local area as we look into week 2.

Given the ridge holding on across the local area into Friday, expect one more day of well above normal temperatures to linger across the local area and extended the current heat advisory into Friday evening early in the day to reflect this. Temperatures should then moderate and cool a couple degrees over the upcoming weekend as the main area of high pressure lifts northeast. This will result in a southeasterly upper level flow pattern across the area to steer some monsoonal moisture across the area late in the weekend and into early next week, which combine with a few weak embedded disturbances, could bring a small chance for some thunderstorms across the higher terrain and deserts by this weekend or Monday.

AVIATION

07/0559Z.

At 0512Z at KLAX, the marine layer was 800 ft deep. The top of the inversion was 2300 ft deep with a temperature of 25 C.

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

Fair confidence in TAFs for KSMX and KSBP where VFR transition may be off by 90 minutes and cigs may be off by +/- 300 ft.

Moderate confidence in TAFs for KSBA, KOXR and KCMA where there is a 25 percent chc of IFR cigs 11Z-17Z.

Low confidence in TAF for KSMO with a 40 percent chc of IFR cigs 11Z-16Z.

Moderate Confidence in TAFs for KLGB and KLAX. There is a 25 percent chc of no low clouds. Arrival and clearing times could be off by as much as 90 minutes.

KLAX...Moderate confidence in TAF. There is a 25 percent chc of no low clouds. Low clouds could arrive as late a 13Z. VFR conds could arrive any time 15Z-17Z. Good confidence that any east wind component will be AOB 5kt.

KBUR...High confidence in TAF.

MARINE

06/754 PM.

High confidence in Small Craft Advisory (SCA) level NW winds persisting through at least Thursday across the Outer Waters. There is a 40-60% chance of GALE Force winds Tuesday afternoon through Thursday. Winds will likely be strongest near Point Conception and the Channel Islands, extending south to San Nicolas Island. Short- period, advisory level, choppy seas will gradually increase in height, reaching around 10 ft by mid-week and then subsiding below advisory levels Friday into the weekend.

SCA level NW-W winds will affect the inner waters along the Central Coast and the Santa Barbara Channel during the afternoon and evening hours through Wednesday or Thursday. There is a 40-60 percent chance of GALES Tuesday and Wednesday in the western Santa Barbara Channel, and a 40-50% chance of Gales along the Central Coast Wednesday and Thursday.

For the inner waters adjacent to Los Angeles County, moderate confidence in SCA level gusts through Tuesday night. Otherwise, conds are expected to remain below SCA levels.

LOX WATCHES/WARNINGS/ADVISORIES

CA...Heat Advisory remains in effect from 10 AM Tuesday to 8 PM PDT Friday for zones 38-88-343>345-353-372-373-375>380-548. (See LAXNPWLOX). Wind Advisory in effect until 6 AM PDT Tuesday for zones 349-351. (See LAXNPWLOX). Heat Advisory remains in effect from 10 AM Wednesday to 8 PM PDT Friday for zone 368. (See LAXNPWLOX). PZ...Small Craft Advisory in effect from 10 AM Tuesday to 3 AM PDT Wednesday for zone 645. (See LAXMWWLOX). Small Craft Advisory in effect until 2 PM PDT Tuesday for zones 650-673-676. (See LAXMWWLOX). Gale Warning in effect from 2 PM Tuesday to 3 AM PDT Wednesday for zones 650-673-676. (See LAXMWWLOX). Small Craft Advisory in effect until 10 PM PDT Tuesday for zone 655. (See LAXMWWLOX). Small Craft Advisory in effect until 3 AM PDT Wednesday for zone 670. (See LAXMWWLOX).