Marine Weather and Tide Forecast for Ukiah, CA

SYNOPSIS
A cold front is bringing rain to the area this and this is expected to come to an end tonight. Clearing skies are temperatures below seasonal normals is expected Tuesday.
Temperatures are expected warm to the upper 90s to around 100 late in the week with a moderate heat risk.



DISCUSSION
A cold front is bringing some light to moderate rain to the area this afternoon. This will be coming to an end this evening. High pressure and northerly winds start to build back into the area on Tuesday. The low clouds in the valleys may take some time to clear out, although most areas are expected to see clear skies by midday. Highs are expected to warm into the 70s in most of the inland areas although Lake county may be close to 80.
Tuesday night into Wednesday morning is expected to be a chilly night with most areas falling into the 40s. Frost is possible in the coldest spots in Trinity and eastern Humboldt counties, such as Ruth, Hayfork and Valley.

The high pressure starts to build in on Wednesday with inland highs warming around 10 degrees over the previous day yielding highs in the upper 80s to low 90s. Thursday the temperatures are expected to increase by another 10 degrees or so with highs climbing into the upper 90s to around 100 in many of the inland valleys. At the coast offshore flow each night is generally expected to keep coastal areas clear with the ridge axis to the west of the coast. Breezy north winds are expected each afternoon and this will likely keep coastal temperatures in the low 60s through Thursday. Friday may start to be a transition day with some marine influence returning to the Mendocino coast. On the Humboldt and Del Norte coast Friday will be a tricky day. Winds start to weaken. This may either allow temperatures to warm up into the 70s or stratus will form and keep them around 60. Farther inland the warming continues with highs over 100 in many valleys Friday and Saturday. Moderate to locally major heat risk is expected to start on Thursday in most inland areas and continue through Saturday. One of the big factors will be the overnight lows. In the valleys the temperatures may end up dropping slightly more than currently expected and this could diminish the overnight heat risk. The details remain uncertain, especially in the coastal counties, but this is starting to look like it will be some of the hottest weather so far this summer. MKK

AVIATION
The cold front is currently bringing some lower CIGS and VIS to the northern areas as the front moves through.
Currently this is bringing variable conditions with some areas as low as LIFR. These are generally expected to remain low through the night as the front fizzles out. Tuesday northerly winds start to pick up and with the weaker inversion behind the front skies are expected to clear fairly quickly in the morning. Farther south Ukiah may see some periods of low clouds, although confidence is low on low they will get. They are also expected to clear by mid- morning on Tuesday. MKK

MARINE
The southerly winds are expected to diminish later this evening and become northerly again overnight. Wind driven waves associated with these southerly winds have built to 3 to 6 feet in the northern waters and will diminish overnight. Early Tuesday morning a fresh northwest swell is expected to build to around 7 or 8 feet at 10 seconds.

Tuesday afternoon high pressure starts to build into the waters ranging from 15 kt in the north to 25 kt in the south. So have added a small craft advisory to the southern waters to highlight this. These winds continue to build Tuesday night and Wednesday with gales expected at some point on Wednesday. So have added a gale watch to the southern waters Wednesday afternoon. At some point late Wednesday afternoon or overnight the northern waters will also see near gales or gales and a gale watch may be needed.
These are expected to remain near gale or gales into Thursday and possibly into Thursday night. Thursday afternoon the gales start to push farther off the coast and this will diminish the winds in the southern waters. Friday and into the weekend the gales are expected to push farther offshore, although confidence is low on how far off the coast they will go. MKK

FIRE WEATHER
Wetting rains are expected to come in to an end tonight in Del Norte and Humboldt counties. Dry conditions will then return Tuesday into Wednesday with temperatures warming considerably across the interior. By Thursday, high temperatures could be exceeding 100 degrees in some interior valley locations.
This is expected to drop afternoon RH into the mid to upper teens Wednesday and low to mid teens Thursday across Lake county, eastern Mendocino and Trinity counties. Wednesday night into Thursday morning Rh recoveries are only expected to be around 20 to 40 percent in eastern and southern Lake county as well as far eastern Mendocino county. Wednesday night northerly winds are expected to pick up over the higher terrain of southern and eastern Lake county as well up into the Yolla Bolla mountains of NE Mendocino and SE Trinity counties. Sustained winds of 15 to 30 mph with gusts to 40 mph in some areas. The strongest winds are expected to begin very early Thursday morning and start to taper off by mid to late morning. In general this looks on the low end of the red flag criteria and there is still some uncertainty on the fuel moisture so will continue to hold off on the fire weather watch.

EKA WATCHES/WARNINGS/ADVISORIES
CA...
None.
NORTHWEST CALIFORNIA COASTAL WATERS...
Small Craft Advisory until 9 PM PDT this evening for PZZ450.

Small Craft Advisory until 7 PM PDT this evening for PZZ470.

SMALL CRAFT ADVISORY FROM 3 PM TUESDAY THROUGH 2 PM PDT WEDNESDAY.

A GALE WATCH FROM 3PM WEDNESDAY THROUGH 3 AM THURSDAY..