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Flood Watches

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Flood Watches

Postby maverick » Thu Jun 09, 2011 9:34 am

Be careful out there this weekend, and next week!

THE NATIONAL WEATHER SERVICE IN HANFORD HAS ISSUED A

* FLOOD WATCH FOR PORTIONS OF CENTRAL CALIFORNIA...INCLUDING THE
FOLLOWING AREAS...
THE SOUTHERN SIERRA NEVADA ABOVE RESERVOIRS...FROM YOSEMITE PARK
SOUTH TO THE KERN COUNTY LINE.

* FROM LATE FRIDAY NIGHT INTO NEXT WEEK.

* POTENTIAL FLOODING OF RIVERS AND STREAMS WOULD INCLUDE THE
MERCED RIVER IN YOSEMITE PARK...THE SAN JOAQUIN RIVER ABOVE
MILLERTON...THE KINGS RIVER ABOVE PINE FLAT...AND THE KAWEAH
RIVER ABOVE TERMINUS DAM INCLUDING THREE RIVERS.

* INCREASING SNOWMELT WILL OCCUR AS TEMPERATURES WARM OVER THE
NEXT SEVERAL DAYS...WITH EVEN WARMER WEATHER EXPECTED FOR THE
FIRST HALF OF NEXT WEEK.

* IMPACTS INCLUDE POTENTIAL FLOODING OF HIKING TRAILS...
CAMPGROUNDS...AND SMALLER BACK ROADS. RIVERS AND STREAMS FOR
BOATERS AND RAFTERS WILL BECOME INCREASINGLY HAZARDOUS...AS THE
FAST FLOWING...AND VERY COLD WATERS CONTINUE TO RISE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD TO
FLOODING. FLOODING IS A VERY DANGEROUS SITUATION. YOU SHOULD
MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION SHOULD
FLOOD WARNINGS BE ISSUED.

REMEMBER...THAT HIGHEST RIVER FLOWS GENERALLY OCCUR DURING THE
LATE EVENING AND EARLY MORNING HOURS...USUALLY WITHIN AND HOUR OR
TWO OF MIDNIGHT. A CAMPGROUND OR TRAIL MAY BE DRY AND APPEAR QUITE
SAFE DURING THE AFTERNOON...BUT CAN QUICKLY TAKE ON WATER AT
NIGHT.
HST= Wilderness Adventurer who knows no bounds, except for their own imagination.

Have a safer backcountry experience by using the HST ReConn Form 2.0, named after Larry Conn, a HST member: http://reconn.org



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Re: Flood Watches

Postby oldranger » Thu Jun 09, 2011 11:22 am

REMEMBER...THAT HIGHEST RIVER FLOWS GENERALLY OCCUR DURING THE
LATE EVENING AND EARLY MORNING HOURS...USUALLY WITHIN AND HOUR OR
TWO OF MIDNIGHT. A CAMPGROUND OR TRAIL MAY BE DRY AND APPEAR QUITE
SAFE DURING THE AFTERNOON...BUT CAN QUICKLY TAKE ON WATER AT
NIGHT.


We had this discussion before and high flows really depend on where you are relative to the source of the snow melt. But the higher you are in a drainage the more likely the above is likely to hold.

Mike
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Re: Flood Watches

Postby rlown » Thu Jun 09, 2011 12:25 pm

I wonder if anyone on this forum has camped in a spot, only to flood out later in the day, or night.

I've only experienced that once, but that was an afterbay, and my friends camped too close to the water. They woke up when the feet of their sleeping bags were under water, and their fishing poles had to be rescued by wading in a bit. I was asleep up the hill, warm and comfy in the back of my blazer.
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Re: Flood Watches

Postby RoguePhotonic » Thu Jun 09, 2011 12:48 pm

Sweet. Heading to Yosemite for the weekend this Friday. Would love to see some flooding. :D
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Re: Flood Watches

Postby oldranger » Thu Jun 09, 2011 7:03 pm

When I worked for the BLM we had a "traveling award" called the golden oar award. The the year it was first given it was for arriving at the boat launch with no oars! The next year was for an experienced boater who woke up to find his raft had floated away during the night after an upstream thunderstorm raised the John Day River.

Personally, I've either been lucky or good! :)

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Re: Flood Watches

Postby oldranger » Fri Jun 10, 2011 7:24 am

The water is up to the Cedar on the Happy Isles USGS webcam. How high will it go?

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Re: Flood Watches

Postby balzaccom » Fri Jun 10, 2011 11:54 am

Washburn Lake in the mid-70's. Campsite was near the water...and in the middle of the night, the water was a whole lot closer, so we hard to hop up and move.

Experience is, in fact, a great teacher!
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Re: Flood Watches

Postby Bernard » Fri Jun 10, 2011 6:46 pm

I haven't posted in an eternity but would like to add that the waterfalls in Yosemite Valley are rocking. Not necessarily rocket science I know but impressive enough for me to add comment.
B.
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Re: Flood Watches

Postby Wandering Daisy » Fri Jun 10, 2011 8:13 pm

Be careful what you wish for. If the Merced at Pohono Bridge gets above about 12 feet they close the roads into the valley. The falls may be rocking, but you may not be able to get in to see them.
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Re: Flood Watches

Postby Wandering Daisy » Fri Jun 10, 2011 8:47 pm

Not sure I am reading the data correclty, but initial snowmelt model results predict 90% probability of 14.5 feet stage on the Merced at Pohono Bridge for June 14-- basically this closes yosemite valley. Lets hope it is wrong.
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Re: Flood Watches

Postby Wandering Daisy » Sat Jun 11, 2011 9:40 am

I have been trying to get information from the park, with no luck. Does anyone know the policy if the valley roads are closed due to flooding, can you still get in Hwy 41 and drive to Glacier Point or Wawowna Tunnel (to start Pohono trail)?
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Re: Flood Watches

Postby RoguePhotonic » Mon Jun 13, 2011 12:18 am

The river was certainly high! There was a decent ford on the bike path that crosses Leidig Meadow.

Hetchy Hetchy was 30 to 40 feet lower then normal to make room for the melt. A ranger told me that lake rose 85 feet in a single day once.
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