Weather Alert in Washington
Flood Warning issued March 12 at 1:57AM PDT until March 14 at 1:30AM PDT by NWS Portland OR
AREAS AFFECTED: Wahkiakum, WA
DESCRIPTION: ...Forecast flooding changed from Minor to Moderate severity and increased in duration for the following rivers in Washington... Grays River at Covered Bridge near Rosburg affecting Wahkiakum County. * WHAT...Moderate flooding is occurring and moderate flooding is forecast. * WHERE...Grays River at Covered Bridge near Rosburg. * WHEN...Until early Saturday morning. * IMPACTS...Above 30.5 feet, expect widespread lowland flooding and numerous flooded roads near Rosburg and Hwy 4. These include Covered Bridge Road near the gage and the roadway approaches to the Altoona Bridge downstream of the gage. * ADDITIONAL DETAILS... - At 1:15 AM PDT Thursday the stage was 30.6 feet. - Bankfull stage is 27.5 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 1:15 AM PDT Thursday was 30.6 feet. - Forecast...The river will rise to 30.7 feet early this morning. It will then fall below flood stage this afternoon to 27.7 feet late tonight. It will rise above flood stage to 28.6 feet tomorrow afternoon. It will then fall below flood stage again tomorrow evening to 26.8 feet late Sunday evening. It will rise to 26.9 feet early Monday morning. It will then fall again and remain below flood stage. - Flood stage is 28.5 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 this afternoon at 145 PM PDT.
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Weather Topic: What are Shelf Clouds?
Home - Education - Cloud Types - Shelf Clouds
Next Topic: Sleet
A shelf cloud is similar to a wall cloud, but forms at the front
of a storm cloud, instead of at the rear, where wall clouds form.
A shelf cloud is caused by a series of events set into motion by the advancing
storm; first, cool air settles along the ground where precipitation has just fallen.
As the cool air is brought in, the warmer air is displaced, and rises above it,
because it is less dense. When the warmer air reaches the bottom of the storm cloud,
it begins to cool again, and the resulting condensation is a visible shelf cloud.
Next Topic: Sleet
Weather Topic: What is Snow?
Home - Education - Precipitation - Snow
Next Topic: Stratocumulus Clouds
Snow is precipitation taking the form of ice crystals. Each ice crystal, or snowflake,
has unique characteristics, but all of them grow in a hexagonal structure.
Snowfall can last for sustained periods of time and result in significant buildup
of snow on the ground.
On the earth's surface, snow starts out light and powdery, but as it begins to melt
it tends to become more granular, producing small bits of ice which have the consistency of
sand. After several cycles of melting and freezing, snow can become very dense
and ice-like, commonly known as snow pack.
Next Topic: Stratocumulus Clouds
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