Weather with Cliff Mass

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The pattern has shifted, and rain is here to stay, says KPLU weather expert Cliff Mass, a professor of Atmospheric Sciences at the University of Washington.

By this evening, we'll be in an "occasional showers" mode, which means you might find dry spells this weekend to rake leaves and be outside.

Want to avoid getting caught in a shower? Mass suggests using the local weather radar, to check the latest status.

Expect light, misty rain for much of today, says KPLU weather expert Cliff Mass, professor of Atmospheric Sciences at the University of Washington. And a much stronger front is approaching on Saturday night -- bringing heavy showers on Sunday.

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Don't credit global warming. And don't call it karma. Sometimes, weather patterns just lock in place, says KPLU weather expert Cliff Mass.

Today, the pattern is perfection. Sunny, clear skies, with temperatures in the upper 60s, occasionally breaking 70, says Mass, a professor of Atmospheric Sciences at the University of Washington. And seven days in a row of that, stretching through next Thursday. It could change at the end of next week, but maybe not, he says.

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Yes, this morning's brief showers showed that in fact our fabulous summer is at an end (but there will be more sunny days to come), says KPLU's weather expert Cliff Mass.

Mass added that forecasters were blindsided by this morning's rain across the region, but they are back on track with predictions of a front moving in this afternoon. That front too will bring some rain, but the clouds will burn off probably by Saturday evening and Sunday will be sunny.

Greg Johnson / Skunk Bay Weather Blog

Greg Johnson, a Puget Sound weather aficionado, was recently called out by KPLU’s own weather expert Cliff Mass for a unique video that shows the development of superior mirages during the day. And, with our string of sunny days, there has been plenty of opportunity to see the mirages this summer.

He seems like your ordinary scientist, but KPLU weather expert and University of Washington professor of Atmospheric Sciences Cliff Mass has been moonlighting. He can be found in courtrooms, as a favorite expert when the weather may determine guilt or innocence.

For the complete story, click the "listen" button above.

Nevermind the predictable weather for this weekend (cloudy mornings, sunshine breaking through, temps in the 70's) -- KPLU weather expert Cliff Mass wants to talk about a strange phenomenon along the Washington coast.

The water temperatures on any of our coastal beaches -- along the Olympic coast, at Ocean Shores, Westport or Long Beach -- is typically in the 40s or low 50s, says Mass, a professor of Atmospheric Science at the University of Washington.

That's cold.

A rain shower Sunday night dropped the first measurable moisture since July 23 at Sea-Tac Airport. That ended the dry stretch at 48 days, the second-longest on record. 

The record is 51 days set in the summer of 1951 at Sea-Tac.

"This is like losing a high-scoring basketball or football game by only 1 point....really frustrating!  There is a significant chance this will be the only rain Sea-Tac gets out of the frontal passage," KPLU weather expert Cliff Mass wrote in his blog.

Jake Ellison / KPLU

The record for consecutive days without rain at Seatac is 51 days, set in 1951. To break that record, we'd need to see no rain through Tuesday.

"I think we are probably going to get to 49, but I don't think we'll get to 50 or 51," says KPLU weather expert Cliff Mass, a professor of Atmospheric Sciences at the University of Washington. "It's tragic. But we're going to be happy with the second longest streak of dry weather in Seattle history."

Jake Ellison / KPLU

Hard to know what to root for – a record dry spell or the return of rain.

Our weather expert and University of Washington professor Cliff Mass says the race is on, and it’ll be close.

jakobnewman / Flickr

Western Washington is wrapping up its driest August ever, says KPLU weather expert Cliff Mass, a professor of Atmospheric Sciences at the University of Washington.

And, with no precipitation in sight for the next two weeks, Mass says we may even break an all-time streak for the most consecutive days without rain. The record is 51 days, set in 1951.

"We are thirty-eight days in, right now," he says. "So, we certainly have a shot at the big record."

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Enjoy a beautiful weekend, says KPLU weather expert and UW professor Cliff Mass.

But we've entered a late-summer pattern that should start bringing occasional showers, starting early next week. That brings an end to an annual dry period that makes the northwest drier than the deserts of Arizona, says Mass. It's been four weeks without measurable rain in western Washington.

Today’s going to be hot again, but it's already cooler than expected this morning, says KPLU weather expert Cliff Mass.

“We had some marine air that pushed up the coast, clouds have inundated the coastal areas. So if you're on the coast it's going to be cooler," he says. "And here in the interior we're starting cooler: five to ten degrees in some places. But the trouble is this cool marine air is very thin."

He says that cool marine layer will burn off fast, yielding to hot temps aloft. So today he expects highs of high 80s to 90 closer to the coast. And away from the water, perhaps the low 90s.

"So one more warm day. Then tomorrow a step down. Today's the hottest day."

There's a chance of thunderstorms Saturday afternoon, which could have a big impact on the wildfires in Cle Elum and Thorp. The danger is the chance of lighting without rain.

Evan Hoover / KPLU

In the Seattle region, where we have few air conditioners, a string of 90-plus days can raise alarms:

But with the rest of the country melting under temperatures of 100 degrees or more for days in a row and drought striking the Midwest, we wonder if perhaps we in the Northwest are heat wimps.

The Associated Press

Today’s going to be a great summer day, especially as some low clouds burn off later – but that’s not the best part of the forecast, says KPLU weather expert Cliff Mass.

“Today is the worst day of the weekend, believe it or not. And temperatures are going to get up into the mid- to upper-70s even near 80 in a couple places. So, it’s just an absolute wonderful day. But it’s going to get even better,” he says.

The skies will stay clear and temperatures will warm as we get into the weekend, with many places away from the water seeing 80-plus degrees. 

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