textproduct: Los Angeles

SYNOPSIS

09/1136 PM.

A cooling trend is expected this week, with cooler than normal temperatures expected across much of the area by Tuesday. More robust marine layer cloud coverage is expected, expanding into most coastal valleys by midweek. There remains a low chance of mountain thunderstorms each afternoon through the week.

LONG TERM (THU-SUN)

10/225 AM.

Weak troffing will set up over the state for late this week and over the weekend. Gradients will remain strong through Friday and the weaken over the weekend.

The night through morning low cloud regime should continue through Friday but will lessen over the weekend as the gradients relax. The lower hgts and strong onshore flow will allow for plenty of low clouds in the vlys as well as slow to no clearing at the beaches through Friday.

The onshore flow peaks on Thursday and this will likely generate low end wind advisories for the western Antelope Vly and its foothills.

Temperatures bottom out on Thursday and there will not be a single 90 degree reading in the vlys and the Antelope Vly will only see highs from 88 to 92. Max temps on Thursday will end up 5 to 10 degrees blo normal. Not much change slated for Friday. There will be slight warming over the weekend as the gradients relax.

PW's remain high enough Thursday to continue the small (5 to 15 percent) of mtn convection in the afternoon. The atmosphere really drys out overnight and this should end the convective chc for Friday through the weekend.

AVIATION

10/1801Z.

At 17Z at KLAX, the marine layer was 800 feet deep. The top of the inversion was at 4800 feet with a temperature of 25 Celsius.

There is a chance of IFR/LIFR conditions tonight into Tuesday morning at KSBP (50%) KSMX (70%) KSBA (50%) KOXR (40%) KCMA (20%), and MVFR/IFR conditions at KLGB (20%), KLAX (40%), KSMO (30%).

There is a chance of -TSRA at KWJF KPMD this afternoon (10%) and on Tuesday (30%). All other sites have a 5% chance of of -TSRA on Tuesday

KLAX...High confidence in VFR through 23Z. Low confidence after that, with windows for BKN008-012 during 00-05Z and 10-16Z Tuesday. There is also a 5% chance of -TSRA on Tuesday. High confidence in minimal easterly winds.

KBUR...High confidence in VFR TAF with typical winds through Tuesday, with a 5% chance of -TSRA Tuesday.

MARINE

10/845 AM.

High confidence that conditions will remain below Small Craft Advisory (SCA) across all of the southwestern California coastal waters through at least Friday night. Patches of dense fog are possible on the Central Coast each morning. There is also a 5-10% chance of a thunderstorm over the coastal waters Tuesday through Wednesday.

LOX WATCHES/WARNINGS/ADVISORIES

CA...Coastal Flood Advisory in effect from 6 PM this evening to midnight PDT Wednesday night for zones 349-350-354-362-366. (See LAXCFWLOX). PZ...NONE.