Weather Alert in California
Special Weather Statement issued July 30 at 8:23PM PDT by NWS Eureka CA
AREAS AFFECTED: Coastal Del Norte
DESCRIPTION: ...TSUNAMI ADVISORY IS IN EFFECT FOR THE DEL NORTE COAST... * UPDATES... There have been no significant changes since the last statement. * LOCAL IMPACTs...A tsunami capable of producing strong currents that are hazardous to swimmers, boats, and coastal structures is occurring. Widespread inundation is NOT expected. Some damage to the Crescent City harbor was reported. Note: High tide is occurring now and this will bring higher water levels. * RECOMMENDED ACTIONS... If you are located in this coastal area, move off the beach and out of harbors and marinas. Do not go to the coast to watch the tsunami. Be alert to instructions from your local emergency officials. Tsunamis are a series of waves or surges which can be dangerous for many hours after the first wave arrival. * OBSERVED TSUNAMI WAVE HEIGHTS FROM EARLIER... Crescent City California 2.7 to 4.0 ft. * PRELIMINARY EARTHQUAKE INFORMATION... An earthquake occurred at 425 PM PDT on Jul 29 2025, with a preliminary magnitude of 8.8 centered 315 miles SW of Bering Island, Komandorski at a depth of 46 miles. * TIDE INFORMATION... Humboldt Bay North Spit...Low tides of 2.1 ft at 935 AM PDT on Jul 31, and 1.7 ft at 1110 PM PDT on Jul 31. High tides of 4.7 ft at 358 AM PDT on Jul 31, and 6.3 ft at 419 PM PDT on Jul 31. Crescent City Harbor...Low tides of 2.1 ft at 927 AM PDT on Jul 31, and 1.6 ft at 1104 PM PDT on Jul 31. High tides of 4.7 ft at 349 AM PDT on Jul 31, and 6.3 ft at 405 PM PDT on Jul 31. This product will be updated as new information becomes available. Stay tuned to your local news source and NOAA weather radio for further information and updates.
INSTRUCTION: N/A
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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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