Sunrise 6:11 AM   Sunset 8:16 PM Moonrise 2:29 AM   Moonset 1:00 PM

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PZZ410 1057 Pm Pdt Wed Mar 27 2024
a marine weather statement has been issued for the following areas - . Coastal waters from cape mendocino to pt. Arena ca out 10 nm - . Coastal waters from pt. St. George to cape mendocino ca out 10 nm - . Humboldt bay - . Humboldt bay bar - . Waters from cape mendocino to pt. Arena ca from 10 to 60 nm - . Waters from pt. St. George to cape mendocino ca from 10 to 60 nm - .
at 1056 pm pdt, doppler radar indicated strong Thunderstorms, capable of producing winds to around 30 knots and small hail. These Thunderstorms were located along a line extending from 12 nm northwest of cape mendocino to 37 nm southwest of eureka, moving northeast at 25 knots.
precautionary/preparedness actions - .
water spouts are possible along with stronger Thunderstorms - .locally higher waves - .and lightning strikes. Boaters should seek safe harbor immediately until these storms pass.
mariners can expect gusty winds to around 30 knots - .locally higher waves - .and lightning strikes. Boaters should seek safe harbor immediately until these storms pass.
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lat - .lon 4082 12409 4080 12413 4081 12416 4080 12418 4075 12419 4072 12422 4070 12421 4069 12423 4071 12427 4061 12433 4044 12441 4039 12437 4023 12480 4061 12466 4087 12416 4076 12423 4086 12415 4085 12412 4086 12410

PZZ400 850 Am Pdt Thu May 2 2024
Synopsis for northern california waters - Northerly winds have begun to weaken and turn westerly, although nw winds will remain gusty around point arena through the evening. Seas and winds trend weaker through Friday, then build again as a front quickly moves through the region. Winds will briefly turn southerly ahead of this front before gusty northerlies resume Saturday. Waves will remain below 10 feet through early next week.

FXUS66 KEKA 021223 AFDEKA

AREA FORECAST DISCUSSION National Weather Service Eureka CA 507 AM PDT Thu May 2 2024

SYNOPSIS
A frontal system will bring light rain to Del Norte and northern Humboldt Counties today. Otherwise, dry weather with gusty northwest winds are expected for Mendocino, Lake and eastern Trinity Counties. A colder storm with greater moisture will generate moderate to heavy rain Friday night through Saturday morning. Drastically colder temperatures and light snow are expected for the mountains above 3500 feet on Saturday.

DISCUSSION
Weakening frontal system dropping down from the NW will generate light rain for Del Norte and northern Humboldt Counties today. HRRR continues to indicate probabilities from 80- 100% for >0.20in over 6 hours north of hwy 299, primarily this morning. We will post a graphic of estimated rain totals on our webpage and facebook. NW influx of moisture (PWATs 150-200% of normal) and onshore/upslope westerly flow will make for wet and soggy conditions for Humboldt Bay area with light rain or drizzle through the day. The light drizzle-rain will wind down overnight as low level westerlies shift to southerly. Wet ground will likely yield patches of fog tonight. Light rain with a warm front may redevelop (20% chance) early Friday morning for coastal Del Norte.

Otherwise, dry weather conditions with gusty west-northwest breezes are forecast to continue for Mendocino, Lake and eastern Trinity Counties today. Overnight temperatures in the interior valleys were warmer (+5 to +15F) compared to last night due to increased cloud cover and relentless west-northwest breezes.

A much colder upper trough and associated surface frontal system will bring another bout of wet and unsettled weather to the entire forecast area Friday night through Saturday. Heaviest rain rates will most likely (80% certain) occur 11 PM Friday to 11 AM Saturday, give or take a few hours due to errors in the forecast and models. NBM 75th and 90th QPF percentiles are around 1 inch over 6 hours and the official WPC guidance is very similar. We have not seen heavy rain rates (1in/6hr) since winter and expect there will be some minor flooding of poor drainages and water ponding on roads. The front will move SE by early Saturday and even southern Mendocino and southern Lake will get a good soaking of rain, 0.50- 0.75in over 6 hours, mostly Saturday morning. Threat of widespread heavy rain will be brief (6 hours or less) as the airmass drastically cools down Saturday afternoon. Some snow showers with light amounts are expected for elevations above 3500-4000 feet on Saturday. There may even be a dusting by early Sunday morning down to 2000 feet, however frost is much more probable.

Much colder temperatures (both highs and low) are expected this weekend. High temps for the warmest valleys will struggle to reach 60F. Subfreezing temperatures are certain (100%) for the mountains.
Valleys may freeze again too, mostly in Trinity County where current NBM data set indicates the highest probabilities (>60%) for the coldest valleys.

Cold core trough aloft will progress into the Great Basin on Sunday.
How fast this occurs remains uncertain and a few showers may linger into Sunday. Freezing temperatures are probable in the valleys of Trinity, though after 0.50-1.00in of rain, fog and low clouds will probably form and hinder the longwave cooling. The airmass will be cold and temperatures in the mid 30's are nearly certain (>80% chance) for most all interior valleys.

Additional shortwave troughs in NW flow aloft may generate more showers early-mid next week (highest chance Del Norte). It does not look too wet with persistent rain each or all day. Broad flat ridging and above normal 500mb heights may also build over the area early to mid next week with precip probabilities eventually approaching zero. Considerable uncertainty remains on how fast it will warm next week. Cluster means lean toward slower warming with upper trough lingering over the area. Probabilities for above normal interior temps (> 80F) increase from 0% to 40-60% late next week. DB

AVIATION
Conditions at the coastal terminals have gradually deteriorated overnight. Largely MVFR to IFR conditions will prevail for much of the day as a system moves in, bringing low ceilings with some light rain or drizzle. High-res models suggest rain could become more showery in the late afternoon and evening hours, which could improve conditions to MVFR or VFR in between showers. However, there is fair uncertainty on just how much conditions would improve.

UKI will have a similar setup to today with the low level wind shear threat diminishing by the morning hours, giving way to gusty NW winds in the afternoon. The LLWS threat returns by the evening. Low ceilings and MVFR to IFR conditions look likely to continue at the coastal terminals into early Friday. JB

MARINE
As a system approaches the region winds have begun to shift from gusty northerlies to relatively weaker westerlies. Winds will generally continue to diminish as they turn westerly through the day, though NW breezes south of Cape Mendocino and Point Arena will continue through the nighttime hours. The sea state will calm as winds diminish, with some steeper waves south of Cape Mendocino accompanying the gusty NW winds. Winds and seas Friday will start calmer, but southerlies will increase to 15-20 knots ahead of a cold front arriving in the evening hours. The front will move through quickly and northwesterlies will pick up further behind the front Saturday. JB

EKA WATCHES/WARNINGS/ADVISORIES
CA...
None.
NORTHWEST CALIFORNIA COASTAL WATERS...
None.

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Cape Mendocino
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Thu -- 01:08 AM PDT     2.80 feet Low Tide
Thu -- 03:30 AM PDT     Moonrise
Thu -- 06:09 AM PDT     4.72 feet High Tide
Thu -- 06:14 AM PDT     Sunrise
Thu -- 01:23 PM PDT     -0.23 feet Low Tide
Thu -- 01:59 PM PDT     Moonset
Thu -- 08:15 PM PDT     Sunset
Thu -- 08:17 PM PDT     4.85 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION

Cape Mendocino, California, Tide feet

Punta Gorda
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Thu -- 01:51 AM PDT     0.00 knots Slack
Thu -- 03:29 AM PDT     Moonrise
Thu -- 04:24 AM PDT     0.52 knots Max Flood
Thu -- 06:14 AM PDT     Sunrise
Thu -- 07:02 AM PDT     -0.00 knots Slack
Thu -- 10:20 AM PDT     -1.12 knots Max Ebb
Thu -- 01:59 PM PDT     Moonset
Thu -- 02:15 PM PDT     0.00 knots Slack
Thu -- 05:26 PM PDT     1.00 knots Max Flood
Thu -- 08:14 PM PDT     Sunset
Thu -- 08:43 PM PDT     -0.00 knots Slack
Thu -- 11:17 PM PDT     -0.79 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION

Punta Gorda, California Current, knots

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