Weather Alert in Alaska
Special Weather Statement issued August 11 at 10:20AM AKDT by NWS Juneau AK
AREAS AFFECTED: City and Borough of Juneau
DESCRIPTION: AS OF 10:00 AM MONDAY, THE USGS WEB CAMERA AND LASER GAGE IN SUICIDE BASIN CONTINUE TO SHOW INDICATIONS OF OVER-TOPPING THE ICE DAM WITH ICEBERGS BEING PULLED TOWARDS THE OVERFLOW CHANNEL AND SLOW LOWERING OF WATER LEVELS. THIS MEANS THE BASIN IS AT FULL CAPACITY AND IN THE PAST IT HAS TAKEN UP TO 6 DAYS FROM THE START OF OVER-TOPPING, SUNDAY AUGUST 10TH, 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 10 PM MONDAY OR SOONER AS NEEDED. VISIT WEATHER.GOV/JUNEAU/SUICIDEBASIN FOR MORE INFORMATION.
INSTRUCTION: N/A
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Weather Topic: What is Hail?
Home - Education - Precipitation - Hail
Next Topic: Hole Punch Clouds
Hail is a form of precipitation which is recognized by large solid balls or
clumps of ice. Hail is created by thunderstorm clouds with strong updrafts of wind.
As the hailstones remain in the updraft, ice is deposited onto them until their
weight becomes heavy enough for them to fall to the earth's surface.
Hail storms can cause significant damage to crops, aircrafts, and man-made structures,
despite the fact that the duration is usually less than ten minutes.
Next Topic: Hole Punch Clouds
Weather Topic: What are Mammatus Clouds?
Home - Education - Cloud Types - Mammatus Clouds
Next Topic: Nimbostratus Clouds
A mammatus cloud is a cloud with a unique feature which resembles
a web of pouches hanging along the base of the cloud.
In the United States, mammatus clouds tend to form in the warmer months, commonly
in the Midwest and eastern regions.
While they usually form at the bottom of a cumulonimbis cloud, they can also form
under altostratus, altocumulus, stratocumulus, and cirrus clouds. Mammatus clouds
warn that severe weather is close.
Next Topic: Nimbostratus Clouds
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