Weather Alert in Oregon
Flash Flood Watch issued August 15 at 1:21PM PDT until August 16 at 11:00PM PDT by NWS Pendleton OR
AREAS AFFECTED: Southern Blue Mountains of Oregon; John Day Basin; Ochoco-John Day Highlands
DESCRIPTION: Significant moisture associated with a passing cold front could lead to periods of heavy rainfall, especially in and around thunderstorms through the afternoon and evening. This could lead to flooding in areas surrounding burn scars associated with the 2024 and 2025 fire seasons. Flash flooding caused by excessive rainfall is possible. Rain rates of 1 inch per hour possible within thunderstorms.
INSTRUCTION: You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued.
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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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