Weather Alert in California
Special Weather Statement issued September 11 at 4:14PM PDT by NWS Hanford CA
AREAS AFFECTED: Upper San Joaquin River; Kings Canyon NP
DESCRIPTION: At 411 PM PDT, Doppler radar was tracking showers and a developing thunderstorm near North Lake Campground, or near Aspendell. This cell was nearly stationary or drifting to the northeast very slowly. HAZARD...Wind gusts up to 40 mph. SOURCE...Radar indicated. IMPACT...Gusty winds could knock down tree limbs and blow around unsecured objects. A quick change in wind direction may also occur, which can impact any fire weather operations. Campers, remember lightning strikes can occur up to 25 miles away from a thunderstorm, even in a clear blue sky. Locations impacted include... McClure Meadow Ranger Station and Le Conte Canyon Ranger Station.
INSTRUCTION: If outdoors, consider seeking shelter inside a building. This storm may intensify, so be certain to monitor local radio stations and available television stations for additional information and possible warnings from the National Weather Service.
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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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