textproduct: Seattle/Tacoma

SYNOPSIS

Dry and stable for the foreseeable future. Stratus and pockets of fog at times overnight and in the mornings. The trend looks to be a little more clear over the weekend with mostly sunny skies.

SHORT TERM /TODAY THROUGH SATURDAY/

The forecast is still on track. ENE winds will pick up overnight and peak on Friday. This should act to limit overnight fog and stratus for most, though it could hang on in the south Puget Sound. The rest of the previous discussion can be found below with an update to the aviation sections.

21

Strong high pressure remains anchored over the Pac NW leading to dry and stable weather across western WA. Poor mixing will lead to low clouds trapped near the surface with only partial burnoff during the afternoon. In the mountains, above the inversion, expect plenty of sunshine. High temperatures will range in the 40s to near 50. Lows will trend cooler and in the 30s Friday through the weekend, with temps near freezing over the south sound. 33

LONG TERM /SATURDAY NIGHT THROUGH WEDNESDAY/

High pressure will continue to bring dry and stable weather heading toward the middle of next week. Very good agreement in the ensemble members for high confidence. Lows will remain chilly and in the 30s each morning. 33

AVIATION

A mix of low stratus and pockets of fog continues this morning. LIFR/foggy conditions remain from PAE to AWO, the east Strait of Juan de Fuca areas, and the NW coast. Remaining terminals have MVFR/low stratus. In addition to the low stratus, NE winds 5-8 kt should hinder fog formation at these terminals. Improvement into VFR after 20Z-22Z for all terminals remains likely. NE winds will continue to increase throughout the morning and afternoon to 8-12 kt with a few gusts to 20 kt (particularly in the interior). Clear skies and light to calm winds may create more favorable conditions for fog development Thursday night. Current probabilities for LIFR conditions in fog are between 20-30%, with locally higher probabilities from CLS to OLM to TIW/PLU.

KSEA...Low-end MVFR conditions at the terminal with low stratus early this morning. Expecting the combination of low stratus and NE winds to prevent fog developing at the terminal. Ceilings are expected to improve later this afternoon to VFR. NE winds today 8-13 kt with a couple gusts to 20 kt. There is some uncertainty whether Thursday night will bring another low stratus event or fog. While skies look to remain mostly clear, elevated NE winds may hinder fog development. Probabilities at this time are higher to the north/south of the terminal.

29/HPR

MARINE

Offshore flow through Friday with highest wind and waves through the central/western Strait of Juan de Fuca - a Small Craft Advisory is in effect. Offshore flow eases over the weekend with generally light winds over the waters.

HYDROLOGY

No river flooding is expected in the next 7 days.

SEW WATCHES/WARNINGS/ADVISORIES

WA...None. PZ...Small Craft Advisory until 10 AM PST Friday for Central U.S. Waters Strait Of Juan De Fuca-West Entrance U.S. Waters Strait Of Juan De Fuca.