textproduct: Los Angeles

SYNOPSIS

17/452 PM.

Dangerously hot temperatures will continue all week. Coastal areas will likely peak through Wednesday, with valley and mountain areas peaking through Friday. Dense fog may form starting Wednesday or Thursday. Temperatures lower significantly over the weekend and into next week, but remain above normal.

LONG TERM (SAT-TUE)

17/228 PM.

Saturday and Sunday, models suggest that the high pressure will start to flatten out resulting in zonal flow (west to east), and temperatures will finally start to decrease again. For Saturday, there is a 50% chance that some heat products will need to extended through the evening hours, mainly inland and away from the beaches. However by Sunday, things should cool down rather noticeably. Therefore, no heat products are anticipated. Additionally, the marine layer low clouds and fog may return to coastal areas each night as early as Friday night, and more widespread Saturday night.

As for rain chances, deterministic models (and their respective ensembles) indicate some possibility of light showers after the 25th. Though the current run of the deterministic EC is extremely light, if any, and the GFS shows the front breaking up by Point Conception and not reaching areas south of Point Conception (and still very light). However, no significant storms are indicated for Southern California through the end of the month.

AVIATION

18/0633Z.

Around 0530Z, there was no marine layer depth at KLAX. There was a surface-based inversion up to around 900 feet with a temperature of 30 degrees Celsius.

VFR conditions are expected through the period, except for a very low to low chance of VLIFR to LIFR conditions at coastal terminals between 10Z and 14Z, and a low to moderate chance at coastal terminals after 08Z Thursday.

KLAX...VFR conditions are expected through the period, except for 10 percent chance of VLIFR to LIFR conditions between 10Z and 14Z, and a 30 percent chance at coastal terminals after 08Z Thursday. Any east winds will be less than 7 knots.

KBUR...VFR conditions are expected through the period. No wind impacts are expected through the period.

MARINE

17/1030 PM.

High confidence in the current forecast with generally light winds and small seas through Thursday night. Moderate confidence Friday onward.

Winds will very likely remain below Small Craft Advisory (SCA) levels through at least Thursday night. There is a moderate (30-40 percent) chance of SCA level winds each evening across the far northwestern portion of the coastal waters on Thursday evening and Friday evening.

For the waters southwest through northwest of the Channel Islands and the nearshore waters along the Central Coast, there is a moderate-to-high (30-50 percent) chance of SCA level conditions developing over the weekend with a low (15-20 percent) chance of GALES.

There is a slight chance for dense fog tonight into Wednesday morning, becoming more likely Wednesday night into Thursday morning, and shallow marine inversion may linger over the coastal waters through the week.

LOX WATCHES/WARNINGS/ADVISORIES

CA...Heat Advisory remains in effect until 8 PM PDT Friday for zones 38-87-340-341-343-344-346>350-354-355-362-366-367-549-550. (See LAXNPWLOX). Heat Advisory in effect until 8 PM PDT Friday for zones 87-340-341-346>350-354-355-362-366-367. (See LAXNPWLOX). Extreme Heat Warning in effect until 8 PM PDT Friday for zones 88-342-345-351>353-356>358-368>376-378>380-548. (See LAXNPWLOX). PZ...NONE.