textproduct: Seattle/Tacoma

SYNOPSIS

An upper level ridge will remain over western Washington through Thursday, keeping temperatures above normal. Onshore flow will continue throughout the week, bringing rounds of morning stratus to the area. A dissipating frontal system will move into the region Friday into Saturday, bringing the next chance of some showers. Another ridge will build into the region Saturday afternoon into Sunday, but looks to weaken early next week.

SHORT TERM /TODAY THROUGH THURSDAY/

Stratus continues to gradually push inland early this morning, with nighttime satellite products indicating it has made it into the southern Sound. Expect stratus to continue to expand across Puget Sound through the morning hours for some morning cloud cover across the area. Stratus will then scatter and retreat back to the coast by the late morning/early afternoon hours. Temperatures as a result will be a few degrees cooler than yesterday's, but will still be above normal, topping out in the mid 70s across much of the interior. Minor HeatRisk will continue across the interior as a result. The coast will stay cooler under the marine layer, with temperatures expected to top out in the 60s.

High pressure will remain in control both Wednesday and Thursday for continued warm and dry conditions across western Washington. Onshore flow will also continue, bringing additional rounds of morning stratus to the area. At this time, onshore flow looks to increase and be the strongest Wednesday night into Thursday, which will allow for cloud cover on Thursday to stick around a bit longer. Temperatures will still trend above normal, nevertheless, with afternoon highs expected to be in the upper 60s to low 70s. Minor HeatRisk will continue across portions of the interior, but will gradually decrease in extent both Wednesday and Thursday.

LONG TERM /THURSDAY NIGHT THROUGH MONDAY/

A weak, dissipating front will approach the area on Friday, bringing the next chance of showers. Overall amounts look to remain rather light, with some areas not even expected to see any precipitation. Latest probabilities still indicate less than 10 percent chance of the area exceeding 0.10" of rain. Temperatures will cool on Friday and will only top out in the low to mid 60s.

High pressure will then build back into the Pacific Northwest in the wake of the front for another period of dry weather heading into early next week. Temperatures will warm a few degrees each day, topping out in the mid 70s for highs by Sunday. Minor HeatRisk will return to areas across the interior, though the coast will remain cooler, with temperatures only expected to be in the 60s.

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AVIATION

An upper ridge axis centered offshore today will shift inland tonight with northerly flow aloft becoming west to northwesterly. Moderate onshore flow continues near the surface. The marine layer will extend into the interior lowlands this morning with widespread IFR or low MVFR ceilings. The stratus will burn back to near the immediate coastline after 18Z with VFR expected across most of the interior from 20Z into this evening. The stratus will migrate inland again tonight with widespread low MVFR or IFR ceilings expected for most terminals again Wednesday morning.

KSEA...Stratus is spreading into the vicinity of the airport as of 08Z and is expected to solidify into an IFR or low end MVFR ceiling that will persist into late morning before scattering out to VFR this afternoon. A return of similar conditions is likely for Wednesday morning. Surface winds S/SW 5 to 10 knots.

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MARINE

Varying degrees of onshore flow will persist through the week as a surface ridge remains anchored offshore with lower pressure inland. A weak system passing north of the area late Wednesday will enhance the onshore flow. This will lead to possible westerly gales in the central and east strait Wednesday evening as well as gusty northwest winds and steep seas for the outer coastal waters.

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HYDROLOGY

No river flooding expected over the next 7 days.

SEW WATCHES/WARNINGS/ADVISORIES

WA...None. PZ...Small Craft Advisory until 5 AM PDT early this morning for Central U.S. Waters Strait Of Juan De Fuca-East Entrance U.S. Waters Strait Of Juan De Fuca.

Small Craft Advisory from 4 PM this afternoon to 3 AM PDT Wednesday for Central U.S. Waters Strait Of Juan De Fuca- East Entrance U.S. Waters Strait Of Juan De Fuca.

Gale Watch from Wednesday afternoon through late Wednesday night for Central U.S. Waters Strait Of Juan De Fuca-East Entrance U.S. Waters Strait Of Juan De Fuca.