textproduct: Seattle/Tacoma

UPDATE

A little bit lighter surface gradients this morning ( cross Cascades gradient -8 versus -10 mb and Olympia to Bellingham -1 mb versus -2 mb ) compared to Saturday morning allowed a little more fog to form across the area. The fog is shallow, only a couple hundred feet thick, and will dissipate by noon. The exception will be over the Southwest Interior where the fog is a little thicker and will last into the afternoon. Monday morning looks similar to today with little change in the pattern. Surface gradients become lighter Tuesday for more morning low clouds and fog. Current forecast in good shape. No update this morning. Felton

SYNOPSIS

A strong and stable ridge will remain in place through the middle of the week. A cool trough will keep snow levels low moving toward the weekend.

SHORT TERM /TODAY THROUGH TUESDAY/

Strong high pressure remains in place leading to ongoing dry and stable weather conditions. There's patchy shallow fog in the interior this morning with temperatures in the upper 20s and 30s. Expect highs around 50. We'll see similar conditions through Tuesday. 33

LONG TERM /TUESDAY NIGHT THROUGH SATURDAY/

High pressure keeps western WA dry through at least Wednesday (and possibly Thursday). Rain/snow chances increase toward Friday and the weekend as weak disturbances pass through in NW flow. The air mass will be cooler with lower snow levels. Probabilities of lowland snow (1" or greater) are less than 10%. Fraser River outflow winds are possible too (affecting the NW Interior) on Saturday. 33

AVIATION

Few areas of fog continue across a few of the terminals this morning (primarily in the interior closest to water). A couple micro-scale wave features may be enough to keep the fog going through roughly 18Z in spots before an eventual clearing for the remainder of the day to VFR. Spots not receiving fog will remain VFR through the day. Winds will remain light out of the north 4-8 kt, dropping to under 5 kt tonight/Monday morning. There is a 30-50% chance of additional fog/mist or stratus development tonight/Monday morning, with the highest confidence in the south interior (especially given the lighter winds). Spots that do not receive fog will stay VFR into Monday.

KSEA...A patch of fog made it into the terminal this morning, and will mix in and out through the morning (likely through at least 18Z). VFR for the remainder of the day once the fog clears. Winds N/NE 4-8 kt becoming 5 kt or less tonight/Monday. Probabilities for IFR/LIFR conditions increase to 30-40% from 09Z-18Z Monday (with development likely to occur in the vicinity to the south).

HPR

MARINE

High pressure and generally light offshore winds through the middle of the week. 33

HYDROLOGY

No river flooding is expected over the next 7 days.

SEW WATCHES/WARNINGS/ADVISORIES

WA...None. PZ...None.