Tuesday, October 24, 2017

Northwest Weather Believe It or Not!

There has been a lot of precipitation during the past two weeks and the impacts may surprise you.

Question 1:  The cumulative precipitation at Seattle Tacoma Airport over the past six months has been:

1.  Way below normal
2.  Normal
3. Way above normal

The answer, shown by the plot of cumulative precipitation, is ALMOST EXACTLY NORMAL.  Our spring was wetter than normal, then almost no precipitation in July and August, followed by roughly five inches since mid-October.
Question 2:  The cumulative precipitation at Yakima, WA for the past six months was:

1.  Way below normal
2.  Normal
3. Way above normal

Question 3:  The precipitation for the past year at Seattle-Tacoma Airport was

1.  Way below normal
2.  Normal
3. Way above normal
4.  Slightly above normal
5.  Moderately below normal

The answer:  slightly above normal.
The lesson in all this is that one can get drier and wetter than normal periods, but often it all comes out in the wash if one considers a long enough period.

Now you want want to see something that is really amazing?  Here is the upper level (500 hPa) map forecast for Thursday at 11 PM.  A HUGE ridge of high height (or pressure).  Expect temperatures in the mid-60s for Thursday and Friday.

The ridge will still be in place Saturday afternoon at 5 PM.  Get outside..it will be wonderful.  Any good weather this time of the year is a gift from the weather gods.


Unknown said...

Meanwhile Sunnyvale California reached a record high of 92.3 today, and record highs were recorded throughout the LA basin.

lhsouthern said...

Good! My husband's cross country team has districts saturday.

Bill Reiswig said...

Cliff... are you saying that a long period of drought bookended by periods of far above average precipitation is the same climaticly as a more typical distribution of precipitation? The phrase "it all comes out in the wash" seems intended to suggest that whether we have a normal distribution of rainfall or one with greater extremes that these are somehow equivelent.

Its certainly an interesting point that we have normal annual precipitation after a years tally, but the year is one characterized by extremes (for us) of climate.

Unknown said...

Time to rinse the gutters and do some power washing this weekend. Hot diggity dawg!

Richard said...

Port Angeles saw about 1.5" mid-May to mid-Oct.; normal would be close to 3.9". Very stressful to plant life, and the third such summer in a row. Insects have been less abundant, and so have the birds that eat them, esp. the flycatcher types. Yes, we have enough water to drink but things have been rough in the forest.

Jim Terry said...

I'm in LA on business. Had to attend an outdoor meeting Tuesday at 1:30 pm. It was miserable! Temp in my car said 104°. Wish I were home!

Rina rosiana said...

obat aborsi

Kenna Wickman said...




(I read about this on the Intranets)

Karen Grooms said...

A gift indeed! Glorious colors too vibrant for the imagination or camera. Go see them.

Gary Anshutz said...

Cliff, not related to this entry, but check out the UW radar yesterday. I think I noticed a ball of Geese flocking off the SE Washington coast and later there were flocks inline travelling through western Washington into Oregon.
Perhaps you could show screenshots of their travels?
Thanks, Gary Anshutz, Burlington Washington

Tom Butler said...

This year didn't feel normal. What about statistical data on variation from the norm during the course of the year. How does this compare with historical average deviations?

David B. said...

A sub-lesson is that abnormally dry weather in summer tends not to matter much for us in terms of overall precipitation. You can't get drier than zero precipitation, and because we normally don't get much anyhow, even zero ends up being not that much drier than normal in absolute terms.

Unknown said...