Weather Alert in Idaho
Flood Warning issued May 2 at 11:37AM MDT by NWS Pocatello ID
AREAS AFFECTED: Bannock, ID
DESCRIPTION: ...The Flood Warning continues for the following rivers in Idaho... Portneuf River at Topaz affecting Bannock County. * WHAT...Minor flooding is occurring and minor flooding is forecast. This approaches the flood of record. * WHERE...Portneuf River at Topaz. * WHEN...Until further notice. * IMPACTS...At 4.0 feet, Lowland and crop field flooding possible from Pebble Creek to Inkom. * ADDITIONAL DETAILS... - At 11:15 AM MDT Thursday the stage was 4.1 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 11:15 AM MDT Thursday was 4.3 feet. - Forecast...The river will rise to 4.2 feet this afternoon. It will then fall early Saturday morning. It will rise to 4.6 feet early Tuesday morning. It will then fall again but remain above flood stage. - Flood stage is 4.0 feet. - Flood History...This crest compares to a previous crest of 4.5 feet on 02/22/2017. - http://www.weather.gov/safety/flood
INSTRUCTION: Motorists should not attempt to drive around barricades or drive cars through flooded areas. Caution is urged when walking near riverbanks. Additional information is available at www.weather.gov/pocatello.
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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
