Marine Weather and Tide Forecast for Signal Hill, CA

.SHORT TERM (TDY-MON)...12/135 PM.

A classic December dense fog pattern is setting up again along the coast under a very strong and shallow marine inversion and very light pressure gradients in all directions. Stratus has been rapidly moving up the Central Coast and expecting most coastal areas to be engulfed in dense fog by later this afternoon and evening, likely creating some delays at coastal airport sites.
This may continue into Sunday as well.

Otherwise, the lengthy dry spell continues and not expected to change until the week of Christmas. In the meantime, the shift now to light onshore flow will continue the slight cooling trend, mainly just for coastal areas through Saturday before another high pressure ridge nudges in from the west Sunday into early next week. At that point temperatures will start climbing again with widespread 80s across the coastal valleys south of Pt Conception and 70s to lower 80s in the northern valleys. Northerly flow will start ramping up Monday which should lead to some gusty winds across southern Santa Barbara County and the I5 corridor.

.LONG TERM (TUE-FRI)...12/155 PM.

Around mid week next week the upper level pattern will begin a slow shift towards a more favorable pattern for rain locally. The long standing ridge will begin to break down which will allow storms to drop farther south into California. Virtually all of the AI and ensemble models are indicating a return of rain to southern California before Christmas but there remains a large amount of uncertainty on timing and strength. Likely dry through at least the 21st of Dec and possibly as late as the 24th.

In the meantime, temperatures will remain well above normal through the end of next week but with a slow cooling trend.

AVIATION
13/0004Z.

At 2355Z at KLAX, the marine layer was 600 feet deep. The top of the inversion was 1900 feet with a temperatures of 24 Celsius.

Overall, low to moderate confidence in 00Z TAF Package.

VFR conditions expected at desert airfields (KPMD & KWJF).

VLIFR or LIFR conditions (with vsbys 1/4 to 1 mile) will likely have more expansive coverage tonight into Saturday morning across coastal TAFS. Timing of CIG/VSBY restrictions may be off +/- 3 hours, and flight minimums off by one category. There is a 20% chance VLIFR conds after 14Z Saturday at KPRB. Very low confidence if and when CIGs arrive at KSBP.

KLAX...Low to moderate confidence in TAF. Arrival and clearing times of CIGs may be off +/- 3 hours. Expecting longer coverage of VLIFR to LIFR conditions from late this afternoon through at least tomorrow morning. VV001-VV002 with 1/4SM FG possible to likely at times tonight into early Saturday morning. No significant east wind component expected through period.

KBUR...High confidence in VFR conditions through at least Saturday with light winds.

MARINE
12/135 PM.

Areas of dense fog with very low visibility will affect the coastal waters through at least Saturday. This fog could form anywhere at anytime and is expected to expand in coverage to include a majority of the coastal waters. The focus will be in the overnight through morning hours with scattered pockets likely through the afternoon and evening.

High confidence in light winds and lowering seas through the weekend. Gusty NW-W winds will likely return Monday and Tuesday.
Small Craft Advisory (SCA) level winds most likely across the Outer Waters south of Point Conception.

Winds will become stronger Wednesday and Thursday, bringing a 30% chc for Gale Force winds from near Point Conception to San Nicolas Island including portions of the Santa Barbara Channel.
These stronger winds will likely result in choppy seas.

LOX WATCHES/WARNINGS/ADVISORIES
CA...Dense Fog Advisory in effect until 10 AM PST Saturday for zones 340-346-349-350-354-362-366. (See LAXNPWLOX).
PZ...NONE.