textproduct: Eureka

SYNOPSIS

Much warmer and drier than normal conditions will build today and through the weekend. Cooler conditions return next week with chance for wetting rain mid week.

KEY MESSAGES

-Frost potential through early Friday morning.

-Interior highs int he low 80s this weekend

-Slight chance of wetting rain mid next week.

DISCUSSION

A ridge of high pressure has rapidly begun to build. Clear skies and much drier air settling over the areas has allowed for relatively cold temperatures overnight with many interior valleys in the upper 30s by midnight. Patchy frost formation is likely by sunrise, though sporadic valley fog will limit overall coverage.

Solidly warmer than normal conditions will arrive Friday. Warming will peak this weekend with interior high temperatures in the low to mid 80s. Potential for highs over 85, however, is generally low (around 15% chance for the hottest valleys). Marine air will be restricted to a shallow marine layer at the coast, especially after moderate north winds along shore on Friday give way to nearly calm winds this weekend.

There is high confidence that high pressure will gradually weaken by early next week with a low pressure system moving in along shore. The path, strength, and moisture associated with this low remains highly variable, though chances have slightly improved compared to yesterday. About 40% of model ensemble members suggest wetting rain across the northern half of the area, though still less than 10% show potential for any amount over 1.0 inch. /JHW

AVIATION

Prevailing VFR conditions is expected for all TAF sites through the period. Surface winds from N-NE up to 5 kts, becoming to the NW at 10-15kts with occasional higher gusts Friday afternoon. /ZVS

MARINE

A very steep and hazardous westerly swell will start build in overnight, reaching 10-15 feet at 12 seconds early Thursday. A Hazardous Seas Warning remain in effect through Thursday afternoon for the northern waters, while small crafts advisory for the southern waters. Large westerly swells will gradually subside Thursday night through Friday night, with hazardous conditions for small crafts across all waters. Winds and seas will ease over the weekend, and persist through early next week. /ZVS

EKA WATCHES/WARNINGS/ADVISORIES

CA... Frost Advisory until 9 AM PDT this morning for CAZ102>106- 109>115.

NORTHWEST CALIFORNIA COASTAL WATERS... Small Craft Advisory until 6 AM PDT Saturday for PZZ450-455.

Small Craft Advisory until 11 AM PDT Saturday for PZZ470- 475.