textproduct: Eureka

KEY MESSAGES

- Seasonable temperatures along the coast with persistent overnight and morning coastal stratus and through mid week.

- A gradual warming trend is expected late this week and into the weekend.

SYNOPSIS

Mostly diurnal, pervasive coastal stratus will continue the pattern of low clouds, fog, and seasonal temperatures along and near the coast Tuesday and Wednesday. Better chances for clearing are expected Wednesday and Thursday along the coast. Inland areas will see warm afternoon temperatures early this week before a building high pressure system ushers in hotter conditions for interior valleys by late in the week.

DISCUSSION

An upper level trough in the Pacific Northwest is continuing to bring onshore flow leading to coastal stratus and near normal summertime temperatures. Tuesday is expected to be fairly similar to today with highs in the 90s in Trinity and lake counties. Closer to the coast the marine layer may deepen slightly and bring some slightly cooler temperatures to near coastal areas such as Garberville and Gasquet. The immediate coast is not expected to see much if any clearing. Wednesday the upper level trough starts to move over the area and this may help mix out some of the clouds at the coast and the near coastal areas may start to see some warming.

High pressure is expected to start to build on Thursday and the flow aloft in the Pacific Northwest becomes more zonal. This is expected to warm temperatures another few degrees and help keep the marine layer mixed out.

Friday and into the weekend the ensembles are showing the upper level ridge retrograde slightly towards the west. The models are not in great agreement on how far west this will go and this will directly impact how quickly the heat will build in. Currently the forecast only has a slight warmup. This is still the potential for more warming, but is currently not looking all that hot and only slightly above seasonal normals. MKK

AVIATION

LIFR CIGS continue this morning with the marine layer firmly in place. The southerly winds are expected to push some stratus north into KUKI once again as well. This afternoon CIGS are expected lift at the coast, but any clearing at the immediate coast is expected to be limited to less than hour. Tuesday night the clouds are expected to expand again, although they may not lower as much. Better chances for clearing are expected on Wednesday. MKK

MARINE

The northerly winds have diminished, but still remain around 15 to 20 kt in the outer waters. These are strongest south of Cape Mendocino and especially in the lee of the Cape. These are expected to increase again by Tuesday afternoon south of Cape Mendocino. So have added a small craft advisory for this area. In addition to the wind driven waves there are a couple of small swells. One appears to be westerly and around 3 feet at 12 seconds. The second one is a southerly swell that is expected to build to around 3 feet at 17 seconds by Tuesday morning. The southerly swell is generally expected to continue through much of the week.

Tuesday night through the work week the winds are expected to remain in the 20 to 25 kt range in the outer waters. The inner waters are expected to increase as well, but may be less persistent and slower to increase. MKK

EKA WATCHES/WARNINGS/ADVISORIES

CA... None. NORTHWEST CALIFORNIA COASTAL WATERS... None.