Mother Nature puts the 'sun' in Sunday

Mother Nature puts the 'sun' in Sunday
SEATTLE -- No other way to say it: it's hot.

Saturday, Seattle and Olympia tied their 1995 record high temperatures of 91 and 92 degree temperatures, respectively. (The statistics posted here Saturday evening had them at 90 and 91, but it turned out each city spiked up another degree in the minutes past the preliminary numbers that come out at 5 p.m.)

The Western Washington winner was Vancouver with a 101 degree reading, but several areas in southwestern Washington were well into the 90s. Even the coast had a sweltering day (by their standards) with highs reaching into the mid 80s.

The place to escape the heat was to go north, where Everett, Port Angeles and Friday Harbor only hit 80 degrees due to a seabreeze.

Here is a official list of high temperatures across the region, updated Sunday morning:
Vancouver (WA): 101 Kelso: 97 Shelton: 95 Forks (city): 92 Olympia: 92 Bellevue 92 Seattle: 91 Bremerton: 90 North Bend: 90 Puyallup: 90 Renton: 88 Tacoma: 88 Hoquiam: 86 Gig Harbor: 85 Quillayute: 85 Seattle (Sand Point): 84 Mount Vernon: 83 Bellingham: 81 Port Angeles: 80 Everett: 80 Whidbey Island NAS: 73 There is almost no relief for Sunday, save for the coast where cool, marine winds are returning and highs will only be in the 70s.

For everywhere else, a Heat Advisory remains in effect until 9 p.m. Sunday which basically means….it'll be hot. But it is a handy excuse to dodge mowing the lawn this weekend since the advisory gives the apt advice to limit physical activity.

Except for the coast, highs Sunday are expected to be about 3-5 degrees warmer than you reached Saturday. That puts just about everyone else solidly into the upper 80s to mid 90s.  Seattle's record high for the day is 93 and it stands a decent chance of being broken.  In fact, at 8 a.m., Seattle was at 73 degrees -- a full 8 degrees ahead of where they were 24 hours prior.

The weather makes a big change this evening and into tonight, and it'll be quite jarring, so heads up:

First of all, the thermal trough that is causing this heat will thankfully move east into the mountains this afternoon and evening and then into Eastern Washington overnight. That will allow some cooling west winds to filter in with even possibly some low clouds making it as far east as the western shores of Puget Sound.  But this push is looking pretty tame, so not the big 30 degree cool down we sometimes get to end our heat waves -- probably closer to 10-15 degrees.

But of more note: thunderstorms. As this trough shifts east, our upper level winds will veer to the south. We also have some unstable, monsoon moisture moving north in that flow, which is a classic pattern for trigging thunderstorms over the Washington and Oregon Cascades.

That already happened to an extent Saturday night in Oregon, with a band of storms that fizzled before it reached here, but more showers and thunderstorms are expected to develop Sunday afternoon and evening in Oregon, then drift north.

So Southwesten Washington could conceivably be in the upper 90s, then watch the clouds roll in and see scattered thunderstorms by evening or nightfall.

Those storms could drift farther north into the Puget Sound area and points north overnight. Bottom line: even though there's blazing sunshine Sunday morning, expect an increase in clouds this evening and possibly some rumbles of thunder overnight.  This could also increase the humidity this evening, so with the lingering high heat, could feel fairly yucky.

Monday will be a whole new set of weather variables than Sunday, where we start with areas of morning clouds, especially from Puget Sound west, and then partly to mostly sunny skies. However, showers and thunderstorms will continue to fire over the mountains during the afternoon and evening and could conceivably drift into the lowlands in spots but chances are lower than they are Sunday night. Highs will generally drop the mid 70s to low 80s, but might feel a bit muggier.

A stronger marine push is on tap Monday night and that means we should all awake to cloudy skies Tuesday morning. The sun will eventually bust through for another party to mostly sunny afternoon, but highs now should be solidly in the 70s. Upper flow veers a bit to the southwest, which will end chances of thunderstorms in the lowlands, but still a chance of mountain thunderstorms in the afternoon and evening.

The rest of the week is back to more normal with weak marine flow that will lead to some morning clouds, but plenty of midday and afternoon sun with highs in the mid-upper 70s.

The 4th of July is holding on to decent weather morning clouds, then partly sunny skies in the afternoon with highs near 75.

In the meantime, stay cool out there!

Record Watch:

Here is the list of record high temperatures this week to keep track of.  Actual Saturday high temperature and approximate Sunday forecast high listed in green.
  SAT SUN Seattle (Sea-Tac) 91 (1995) 91 93 (1987) 93 Olympia 92 (2003) 92 95 (1951) 94 Bellingham 84 (1995) 81 89 (1995) 84 Hoquiam 90 (1995) 86 93 (1995) 78 Forks 95 (1995) 85 92 (1995) 75