Weather Alert in Alaska
Hydrologic Outlook issued August 10 at 7:07PM AKDT by NWS Juneau AK
AREAS AFFECTED: City and Borough of Juneau
DESCRIPTION: ESFAJK As of 6:50 PM the USGS web camera and laser gage in Suicide Basin have started to show indications of over-topping the ice dam with icebergs being pulled towards the overflow channel and very little new water rise. This means the basin is at full capacity and in the past it has taken up to 6 days for the outburst flooding event to begin. The water level in the basin will slowly fall as the overflow channel erodes. A faster drop in water levels in the basin along with a rise on Mendenhall Lake will indicate a sub-glacier release and our office will issue a Flood Warning. From that point, the outburst flooding event would take about 48 hours to peak. Now is the time to finish up the flood preparation/planning and get those plans "SET" so they can be put into action, and "GO" when a Flood Warning is issued. Check back regularly for updates on this evolving situation. This product will be updated by 7 AM Monday or sooner as needed.
INSTRUCTION: N/A
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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
Weather Topic: What are Cirrostratus Clouds?
Home - Education - Cloud Types - Cirrostratus Clouds
Next Topic: Cirrus Clouds
Cirrostratus clouds are high, thin clouds that form above
20,000 feet and are made mostly of ice crystals. They sometimes look like giant
feathers, horse tails, or curls of hair in the sky.
These clouds are pushed by the jet stream and can move at high speeds reaching
100 mph.
What do they indicate?
They indicate that a precipitation is likely within 24 hours.
Next Topic: Cirrus Clouds
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