Weather Alert in California
Flood Warning issued February 25 at 9:00AM PST until February 26 at 7:26PM PST by NWS Sacramento CA
AREAS AFFECTED: Butte, CA; Glenn, CA
DESCRIPTION: ...The National Weather Service in Sacramento CA has issued a Flood Warning for the following rivers in California... Sacramento River At Ord Ferry affecting Glenn and Butte Counties. .Recent precipitation will lead to minor flooding at Ord Ferry, Tehama Bridge and Vina Woodson Bridge on the Upper Sacramento River System. For the Upper Sacramento River...Ord Ferry, Tehama Bridge, and Vina Woodson Bridge...Minor flooding is forecast. * WHAT...Minor flooding is forecast. * WHERE...Sacramento River at Ord Ferry. * WHEN...From this evening to tomorrow evening. * IMPACTS...At 110.3 feet, Head cuts in 3Bs silt weir start overflow into Butte Basin, flooding dips on Ord Ferry Road west of River Road in Butte County. Persistent flows at or above this level increase flooding in Butte Basin. Ord Ferry Road and additional roads in Glenn and Colusa counties are closed due to flooding. At 112.0 feet, At 112 to 113 feet, water inundates portions of Ord Ferry Road (County Road 32) in Glenn County from CA-45 east to the county line at the Sacramento River. At 113.8 feet, Design overflow level for M&T, 3Bs and Goose Lake flood control facilities to divert flood flows into Butte Basin. M&T overflows close River Road from Ord Ferry Road to Chico Road. Ord Ferry Road is already closed. At 114.0 feet, Designated flood stage left bank. * ADDITIONAL DETAILS... - At 7:45 AM PST Wednesday the stage was 108.2 feet. - Bankfull stage is 114.0 feet. - Forecast...The river is expected to rise above flood stage late this evening to a crest of 114.6 feet tomorrow morning. It will then fall below flood stage early tomorrow afternoon. - Flood stage is 114.0 feet. - Flood History...This crest compares to a previous crest of 114.8 feet on 03/21/2011. - http://www.weather.gov/safety/flood
INSTRUCTION: Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. For more hydrologic information and stage definitions refer to the following web site: wrh.noaa.gov/sto/hydro_data.php The next statement will be issued Thursday morning at 900 AM PST.
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Weather Topic: What is Rain?
Home - Education - Precipitation - Rain
Next Topic: Shelf Clouds
Precipitation in the form of water droplets is called rain.
Rain generally has a tendency to fall with less intensity over a greater period
of time, and when rainfall is more severe it is usually less sustained.
Rain is the most common form of precipitation and happens with greater frequency
depending on the season and regional influences. Cities have been shown to have
an observable effect on rainfall, due to an effect called the urban heat island.
Compared to upwind, monthly rainfall between twenty and forty miles downwind of
cities is 30% greater.
Next Topic: Shelf Clouds
Weather Topic: What is Sleet?
Home - Education - Precipitation - Sleet
Next Topic: Snow
Sleet is a form of precipitation in which small ice pellets are the primary
components. These ice pellets are smaller and more translucent than hailstones,
and harder than graupel. Sleet is caused by specific atmospheric conditions and
therefore typically doesn't last for extended periods of time.
The condition which leads to sleet formation requires a warmer body of air to be
wedged in between two sub-freezing bodies of air. When snow falls through a warmer
layer of air it melts, and as it falls through the next sub-freezing body of air
it freezes again, forming ice pellets known as sleet. In some cases, water
droplets don't have time to freeze before reaching the surface and the result is
freezing rain.
Next Topic: Snow
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