Weather Alert in California
Special Weather Statement issued July 30 at 7:47AM 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... ** 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... Crescent City 22 Hours * FORECAST PEAK TSUNAMI WAVE HEIGHTS... Fort Bragg 0.7 to 1.4 ft * OBSERVED TSUNAMI WAVE HEIGHTS FROM EARLIER... Tsunami waves are startingto arrive on the West Coast. Up to 4.0 ft observed in Crescent City * PRELIMINARY EARTHQUAKE INFORMATION... An earthquake occurred with a preliminary magnitude of 8.8. * TIDE INFORMATION... 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.
INSTRUCTION: N/A
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Weather Topic: What are Wall Clouds?
Home - Education - Cloud Types - 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
Weather Topic: What are Altostratus Clouds?
Home - Education - Cloud Types - Altostratus Clouds
Next Topic: Cirrocumulus Clouds
Altostratus clouds form at mid to high-level altitudes
(between 2 and 7 km) and are created by a warm, stable air mass which causes
water vapor
to condense as it rise through the atmosphere. Usually altostratus clouds are
featureless sheets characterized by a uniform color.
In some cases, wind punching through the cloud formation may give it a waved
appearance, called altostratus undulatus. Altostratus clouds
are commonly seen with other cloud formations accompanying them.
Next Topic: Cirrocumulus Clouds
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