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 Precipitation?
Home - Education - Precipitation - Precipitation
Next Topic: Rain
Precipitation can refer to many different forms of water that
may fall from clouds. Precipitation occurs after a cloud has become saturated to
the point where its water particles are more dense than the air below the cloud.
In most cases, precipitation will reach the ground, but it is not uncommon for
precipitation to evaporate before it reaches the earth's surface.
When precipitation evaporates before it contacts the ground it is called Virga.
Graupel, hail, sleet, rain, drizzle, and snow are forms of precipitation, but fog
and mist are not considered precipitation because the water vapor which
constitutes them isn't dense enough to fall to the ground.
Next Topic: Rain
Weather Topic: What are Shelf Clouds?
Home - Education - Cloud Types - Shelf Clouds
Next Topic: Sleet
A shelf cloud is similar to a wall cloud, but forms at the front
of a storm cloud, instead of at the rear, where wall clouds form.
A shelf cloud is caused by a series of events set into motion by the advancing
storm; first, cool air settles along the ground where precipitation has just fallen.
As the cool air is brought in, the warmer air is displaced, and rises above it,
because it is less dense. When the warmer air reaches the bottom of the storm cloud,
it begins to cool again, and the resulting condensation is a visible shelf cloud.
Next Topic: Sleet
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