Weather Alert in Oregon
Flood Warning issued March 13 at 11:20PM PDT until March 14 at 4:58AM PDT by NWS Portland OR
AREAS AFFECTED: Tillamook, OR
DESCRIPTION: ...Observed flooding changed to Minor severity and increased in duration for the following rivers in Oregon... Wilson River near Tillamook affecting Tillamook County. ...The Flood Warning continues for the following rivers in Washington...Oregon... Cowlitz River at Kelso affecting Cowlitz County. Grays River at Covered Bridge near Rosburg affecting Wahkiakum County. Johnson Creek at Sycamore affecting Clackamas and Multnomah Counties. Nehalem River near Foss affecting Clatsop and Tillamook Counties. * WHAT...Minor flooding is occurring. * WHERE...Wilson River near Tillamook. * WHEN...Until late tonight. * IMPACTS...Above 12.0 feet, minor flooding of low lying dairy and pasture land north and east of Tillamook can be expected, particularly during high tides. * ADDITIONAL DETAILS... - At 10:30 PM PDT Friday the stage was 12.2 feet. - Bankfull stage is 10.5 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 10:30 PM PDT Friday was 12.2 feet. - Forecast...The river has reached minor flood stage of 12.2 ft. It will then fall below flood stage Saturday morning. - Flood stage is 12.0 feet. - http://www.weather.gov/safety/flood
INSTRUCTION: Motorists should not attempt to drive around barricades or drive through flooded areas. Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Be especially cautious at night when it is harder to recognize the dangers of flooding. Additional information is available at www.weather.gov. The next statement will be issued early Saturday morning at 515 AM PDT.late tonight at 500 AM PDT.
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Weather Topic: What are Fractus Clouds?
Home - Education - Cloud Types - Fractus Clouds
Next Topic: Freezing Rain
A fractus cloud (scud) is a fragmented, tattered cloud which has
likely been sheared off of another cloud. They are accessory clouds, meaning they
develop from parent clouds, and are named in a way which describes the original
cloud which contained them.
Fractus clouds which have originated from cumulus clouds are referred to as
cumulus fractus, while fractus clouds which have originated from stratus clouds
are referred to as stratus fractus. Under certain conditions a fractus cloud might
merge with another cloud, or develop into a cumulus cloud, but usually a
fractus cloud seen by itself will dissipate rapidly.
They are often observed on the leading and trailing edges of storm clouds,
and are a display of wind activity.
Next Topic: Freezing Rain
Weather Topic: What is Graupel?
Home - Education - Precipitation - Graupel
Next Topic: Hail
Graupel is a form of precipitation that is created by atmospheric conditions
which cause supercooled water droplets to contact snow crystals and freeze to
their surface.
Sometimes known as soft hail or snow pellets, graupel is delicate and easily
destroyed by touch. Whereas hail usually falls during severe weather, graupel
doesn't require such conditions to form, and can form in mild precipitation
similar to situations which produce snowfall.
Next Topic: Hail
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