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 Fractus Clouds?
Home - Education - Cloud Types - Fractus Clouds
Next Topic: Freezing Rain
A fractus cloud (scud) is a fragmented, tattered cloud which has
likely been sheared off of another cloud. They are accessory clouds, meaning they
develop from parent clouds, and are named in a way which describes the original
cloud which contained them.
Fractus clouds which have originated from cumulus clouds are referred to as
cumulus fractus, while fractus clouds which have originated from stratus clouds
are referred to as stratus fractus. Under certain conditions a fractus cloud might
merge with another cloud, or develop into a cumulus cloud, but usually a
fractus cloud seen by itself will dissipate rapidly.
They are often observed on the leading and trailing edges of storm clouds,
and are a display of wind activity.
Next Topic: Freezing Rain
Weather Topic: What is Graupel?
Home - Education - Precipitation - Graupel
Next Topic: Hail
Graupel is a form of precipitation that is created by atmospheric conditions
which cause supercooled water droplets to contact snow crystals and freeze to
their surface.
Sometimes known as soft hail or snow pellets, graupel is delicate and easily
destroyed by touch. Whereas hail usually falls during severe weather, graupel
doesn't require such conditions to form, and can form in mild precipitation
similar to situations which produce snowfall.
Next Topic: Hail
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