Weather Alert in California

Recent Locations: Anaheim, CA

Special Weather Statement issued July 30 at 4:52AM PDT by NWS Eureka CA

AREAS AFFECTED: Coastal Del Norte

DESCRIPTION: ...TSUNAMI WARNING IS IN EFFECT FOR COASTAL DEL NORTE... ...TSUNAMI ADVISORY IS IN EFFECT FOR THE HUMBOLDT AND MENDOCINO COAST... * UPDATES... The Humboldt County Coast is no longer in a warning. Tsunami wave impacts are ongoing on the coast but may be starting to lessen. * LOCAL IMPACTS... A tsunami with significant widespread inundation is expected, with possible and dangerous coastal flooding accompanied by powerful currents. Some damage has been reported around the Crescent City Harbor. * RECOMMENDED ACTIONS... If you are located in this coastal area, move to higher ground. Stay out of the water, off the beach and away from harbors, marinas and bays. Do not go to the coast to watch the tsunami. Be alert to instructions from your local emergency officials. * FORECAST TSUNAMI START TIMES... Tsunamis often arrive as a series of waves or surges which could be dangerous for many hours after the first wave arrival. The first tsunami wave or surge may not be the highest in the series. * FORECAST TSUNAMI DURATION... Fort Bragg9 Hours Crescent City30 Hours * FORECAST PEAK TSUNAMI WAVE HEIGHTS... Fort Bragg 0.7 to 1.4 ft Crescent City 2.7 to 5.0 ft Humboldt Bay Around 1 ft. * OBSERVED TSUNAMI WAVE HEIGHTS FROM EARLIER... Tsunami waves are startingto arrive on the West Coast. Up to 3.6 ft observed in Crescent City Up to 1.2 ft observed in Humboldt Bay Up to 3.0 ft observed in Arena Cove * PRELIMINARY EARTHQUAKE INFORMATION... An earthquake occurred with a preliminary magnitude of 8.8. * TIDE INFORMATION... Humboldt Bay North Spit...Low tides of 1.8 ft at 1008 PM PDT on Jul 30, and 2.1 ft at 935 AM PDT on Jul 31. High tides of 6.2 ft at 343 PM PDT on Jul 30, and 4.7 ft at 358 AM PDT on Jul 31. Crescent City Harbor...Low tides of 1.8 ft at 1002 PM PDT on Jul 30, and 2.1 ft at 927 AM PDT on Jul 31. High tides of 6.3 ft at 329 PM PDT on Jul 30, and 4.7 ft at 349 AM 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.

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Weather Topic: What are Stratocumulus Clouds?

Home - Education - Cloud Types - Stratocumulus Clouds

Next Topic: Stratus Clouds

Stratocumulus clouds are similar to altocumulus clouds in their fluffy appearance, but have a slightly darker shade due to their additional mass.

A good way to distinguish the two cloud types is to hold your hand out and measure the size of an individual cloud; if it is the size of your thumb it is generally an altocumulus cloud, if it is the size of your hand it is generally a stratocumulus cloud.

It is uncommon for stratocumulus clouds to produce precipitation, but if they do it is usually a light rain or snow.

Next Topic: Stratus Clouds

Weather Topic: What are Wall Clouds?

Home - Education - Cloud Types - Wall Clouds

Wall Clouds Next Topic: Altocumulus Clouds

A wall cloud forms underneath the base of a cumulonimbus cloud, and can be a hotbed for deadly tornadoes.

Wall clouds are formed by air flowing into the cumulonimbus clouds, which can result in the wall cloud descending from the base of the cumulonimbus cloud, or rising fractus clouds which join to the base of the storm cloud as the wall cloud takes shape.

Wall clouds can be very large, and in the Northern Hemisphere they generally form at the southern edge of cumulonimbus clouds.

Next Topic: Altocumulus Clouds