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Author Topic: California weather extremes and climate  (Read 220811 times)

Sigmetnow

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Re: California weather extremes and climate
« Reply #750 on: April 05, 2018, 04:48:57 PM »
“Whoa: amount of atmospheric moisture near Bay Area could approach *all time* record high level on Sat w/incoming #PineappleExpress #AtmosphericRiver at exact time of year when it typically reaches *minimum* value. That's incredible! #CAwx #CAwater h/t @NWSBayArea ”
https://twitter.com/wunderground/status/981639947873542144
Image below; more at the link.

Near-Record April Rains to Drench Central California, Soak Sierra Snow
https://www.wunderground.com/cat6/near-record-april-rains-drench-central-california-soak-sierra-snow
People who say it cannot be done should not interrupt those who are doing it.

TerryM

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Re: California weather extremes and climate
« Reply #751 on: April 05, 2018, 05:37:16 PM »
“Whoa: amount of atmospheric moisture near Bay Area could approach *all time* record high level on Sat w/incoming #PineappleExpress #AtmosphericRiver at exact time of year when it typically reaches *minimum* value. That's incredible! #CAwx #CAwater h/t @NWSBayArea ”
https://twitter.com/wunderground/status/981639947873542144
Image below; more at the link.

Near-Record April Rains to Drench Central California, Soak Sierra Snow
https://www.wunderground.com/cat6/near-record-april-rains-drench-central-california-soak-sierra-snow
JH Christ!
Stay safe Bruce.

Bruce Steele

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Re: California weather extremes and climate
« Reply #752 on: April 05, 2018, 06:09:56 PM »
If the same Pineapple Express hit last April we would have lost Oroville. A late season rain that melts the Sierra snowpack is a JH moment. Oroville is probably going over the spillway this week , ready or not.
 Here in SB county we are only at ~ 50% of average rainfall. Last year we had average precipitation but we are still stuck in a very long drought. This weeks atmospheric river is forecast to miss us although the half inch of rain forecast is better than nothing. Our reservior ( Cachuma ) is at 40%.

wolfpack513

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Re: California weather extremes and climate
« Reply #753 on: April 05, 2018, 07:51:32 PM »
If the same Pineapple Express hit last April we would have lost Oroville. A late season rain that melts the Sierra snowpack is a JH moment. Oroville is probably going over the spillway this week , ready or not.
 Here in SB county we are only at ~ 50% of average rainfall. Last year we had average precipitation but we are still stuck in a very long drought. This weeks atmospheric river is forecast to miss us although the half inch of rain forecast is better than nothing. Our reservior ( Cachuma ) is at 40%.

Oroville is at 60% of capacity right now with 1.25 million acre feet of storage space left.  What makes you think it’s going over the spillway?

jmshelton

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Re: California weather extremes and climate
« Reply #754 on: April 05, 2018, 09:02:27 PM »
The California Department of Water Resources release a statement that they may use the main spillway at Oroville https://www.water.ca.gov/News/News-Releases/All-News-Articles/Lake-Oroville-Operations-Update-April-4.

"Forecasted storms expected in the Feather River basin this weekend may require using Lake Oroville’s flood control outlet spillway (also known as the main spillway) this week or next.

After last year’s spillway incident, the Department created the 2017/18 Lake Oroville Winter Operations Plan to ensure public safety in the event of major storm events. This plan triggers more aggressive outflow from Hyatt Powerplant and potential use of the main spillway should the reservoir’s elevation reach 830 feet during the month of April. The current forecasts show the potential for inflows to raise the reservoir to near the 830-foot trigger elevation by the middle of next week. Currently, the lake elevation is 794 feet.

In anticipation of the incoming weather, DWR is increasing outflows from Hyatt Powerplant. Outflows were increased from 9,500 cfs to 11,500 cfs at noon, and will be increased to 13,000 cfs at 1PM. Feather River flows are expected to increase as outflows increase. These numbers are approximations."


They are not expecting problems though.  Also, this is not their emergency spillway that is earthlined.  It is the one they had to repair the concrete lining.

TerryM

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Re: California weather extremes and climate
« Reply #755 on: April 06, 2018, 10:01:51 AM »
Bruce
Relieved to hear that it's not forecast to do you harm. I don't want your Agave Roasting experiment to be washed into the Pacific like the Big Sur Bridge was. 8)
That graphic looked horrific.


My best to the Mrs and the piggies.
Terry

Alison

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Re: California weather extremes and climate
« Reply #756 on: April 06, 2018, 11:10:22 AM »
Seconded!

wolfpack513

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Re: California weather extremes and climate
« Reply #757 on: April 07, 2018, 07:36:49 AM »
New NCDC release this morning.  last 12 months were the 2nd warmest April-March in 123 years of records for California.  Last 6 years were all the top 6.

gerontocrat

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Re: California weather extremes and climate
« Reply #758 on: June 29, 2018, 07:15:38 PM »
Summer is here,
Drought area and intensity accelerating ?
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