Cape Mendocino to Point Arena CA from 10 NM to 60 NM Marine Forecast
| Today...Nw Winds 15 To 25 Kt. Waves Nw 9 Ft At 7 Seconds. |
| Tonight...N Winds 15 To 25 Kt. Waves Nw 9 Ft At 7 Seconds. |
| Tue...N Winds 20 To 25 Kt. Waves Nw 10 Ft At 7 Seconds. |
| Tue Night...N Winds 20 To 30 Kt. Waves N 10 Ft At 8 Seconds. |
| Wed...N Winds 20 To 30 Kt. Waves N 9 Ft At 8 Seconds. |
| Thu...N Winds 15 To 25 Kt. Waves N 7 Ft At 7 Seconds. |
| Fri...Nw Winds 10 To 15 Kt. Waves Nw 5 Ft At 5 Seconds. |
| Area Forecast Discussion National Weather Service Eureka CA 538am PDT Monday April 29 2024 Synopsis Stratus and low cloud cover will continue to clear out through the morning. Mild pleasant weather is expected today with colder temperatures expected overnight into Tuesday. Offshore flow and high pressure will promote warming and drying for the interior, late in the week. Low clouds and stratus have already begun to dissipate as drier air aloft is being infused into the area via high pressure, bringing subsidence and pleasant weather by the late morning. Skies are likely to clear as subsidence influences the region. A week inversion can be observed on model soundings, further encouraging mild and pleasant weather as winds mix down. The previously mentioned Pacific high will continue the ridging pattern locally with a meridional flow as it interacts with a mid level trough, to the north of our CWA. A steep pressure gradient, with perpendicular alignment to the coast, will accelerate northerly winds in this meridional flow pattern bringing gusty winds to bear on the Mendocino coast and the interior. Anomalously high winds are being signaled by the ensembles and EFI, for coastal areas south of Point Arena and south towards the SF bay area. Drier air aloft and clearing out of sky cover will allow more radiative cooling over the next few days. This will enhance the probability of frost this morning in Trinity and N Mendocino counties, for which an FR.Y has been issued. These conditions will continue dropping temperatures towards freezing late tonight into Tuesday morning and are expected to spread into the Humboldt and Del Norte interiors. A Freeze Watch has been issued to cover these conditions as NBM indicates a probability of 50-75% for temperatures falling <32 degrees Tuesday morning. Late Tuesday into Wednesday, gusty northerly winds are expected as the pressure gradient tightens considerably along the coast. Clearing skies and increasing offshore flow early Wednesday will promote widespread warming and drying across the region, especially in the interior. RH values currently forecast to drop to 30% in interior Mendocino, Trinity and Lake Counties. Models are still without consensus on high valley temperatures Thursday and Friday - right now NBM only has >50% probabilities in southern Mendocino and Lake counties. Regardless, an overall warming trend is expected with highs in the 70's. /JM /EYS .Aviation...An upper level trough is bringing a few showers to the area this morning, however VFR conditions are in place at the TAF sites. These may briefly lower conditions this morning. Some low clouds are in place in many of the valleys of Humboldt and Del Norte counties. Later this morning and into the afternoon as the trough moves out winds will become breezy, especially in Mendocino and Lake counties. This evening and tonight winds are expected to diminish, but this may be slower than usual. Tonight a few clouds are possible in the valleys of Humboldt county near the coast, but the taf sites and most other areas should remain fairly clear. MKK Marine Northerly winds have started to pick up in the southern waters, mainly near Point Arena and just downwind of Cape Mendocino. Gusts close to 30 kt are occurring in some localized areas. Elsewhere winds are only 5 to 15 kt. Wind driven waves have started to increase with 5 feet at 6 seconds being reported at the buoy off Point Arena. The northwest swell is currently around 6 feet at 12 seconds. The winds will increase some this afternoon, but mainly just south of Cape Mendocino. A small craft advisory has been issued to highlight that. Tonight and Tuesday winds are expected to remain fairly similar to today. Tuesday night and Wednesday winds are expected to start increasing as high pressure finally starts to build into the eastern Pacific. Small craft advisories will likely be needed for the northern waters and gales are possible in the southern waters. Thursday and Friday winds are expected to gradually diminish as another weather system approaches the area. The swell is expected to get reinforced on Tuesday peaking 8 feet at 12 seconds. This swell is expected slowly diminish through the week. MKK .EKA WATCHES/WARNINGS/ADVISORIES... CA... Freeze Watch from late tonight through Tuesday morning for CAZ102-105>108. Frost Advisory until 9am PDT this morning for CAZ107-108- 110-111. NORTHWEST CALIFORNIA COASTAL WATERS... Small Craft Advisory from 3pm this afternoon to 3am PDT Thursday for PZZ455-475. |
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