textproduct: Eureka

KEY MESSAGES

-Moderate to major heat risk continues through the week for much of the interior.

-Surface smoke is possible along the North Coast due to wind traveling down from Oregon today.

SYNOPSIS

Persistent high pressure aloft will remain through the week. Inland areas are subject to abnormally hot temperatures of through the week. Offshore winds in Oregon will transport wildfire smoke to the coastal waters, potentially arriving to the North Coast this evening.

DISCUSSION

A steady ridge of high pressure continues to impact the west this week leading to warm to VERY hot temperatures for the inland areas. Most inland valleys can expect high temperatures between 100-110deg F through the work week. The coast continues to offer some relief from this heat. Offshore stratus broke the streak of 67 degree days in Eureka, with the high temperature at Woodley Island only reaching 66. Areas slightly inland did still reach the 70s, however.

A coastal eddy diverted much of the smoke away from the North Coast on Tuesday. This eddy has enhanced further early this morning keeping a majority of smoke off the coast while also increasing low cloud coverage. Smoke models do show smoke pooling in interior Del Norte, early this morning with clearing likely this afternoon.

The weather pattern will have minimal changes through the week as this high pressure is expected to remain overhead. A slight change in weather is possible this weekend. Cluster and deterministic global model analysis shows this high pressure ridge beginning to weaken through the weekend leading to zonal or even slight upper level troughing entering next week. Until then however, expect warm interior temperatures and foggy nighttime hours along the coast.

AVIATION

Light southerly winds overnight are encouraging offshore stratus as a distinct eddie, south of Cape Mendocino, slings low level stratiform towards the coast. Just before sunset, visible satellite showed dense stratus offshore of Mendocino. Night fog product is showing the same mass creeping up the coast towards the northern Humboldt and Del Norte coastlines. Expect LIFR categories overnight into Wednesday. Nearby, fires are producing considerable smoke that is settling into the areas. ASOS at the terminals have been picking up HZ and expect this to continue to degrade visibility into Wednesday. /EYS

MARINE

Generally light winds have returned to the waters, with a southerly breeze of up to 10 to 15 kts being observed near the coast. Local areas of 25 kt near the Capes. Generally light southerly winds and decreasing northerly waves are expected on Wednesday and Thursday as well. Friday and into the weekend northerly winds are expected to return to the area. Gales are possible over the weekend into early next week.

FIRE WEATHER

Light, offshore flow aloft weakens early this morning. Afternoon RH values are expected to dip into the low teens or single digits this afternoon. Terrain focused winds are expected with upvalley flow for most of the river valleys mixing with southerly winds.

EKA WATCHES/WARNINGS/ADVISORIES

CA... Heat Advisory until 11 PM PDT this evening for CAZ102-110- 111-113-114-118>120.

Heat Advisory until 11 PM PDT Thursday for CAZ105-106-108- 116-117.

NORTHWEST CALIFORNIA COASTAL WATERS... Small Craft Advisory until 9 AM PDT Wednesday for PZZ470.

Small Craft Advisory until 3 AM PDT Wednesday for PZZ475.