Weather Alert in Alaska
Winter Storm Warning issued March 1 at 2:45PM AKST until March 2 at 9:00AM AKST by NWS Juneau AK
AREAS AFFECTED: Petersburg Borough
DESCRIPTION: ...MULTIPLE ROUNDS OF SNOWFALL EXPECTED THROUGH EARLY WEEK... The active weather pattern continues with split flow developing as an incoming front stalls across the central panhandle, with cold strong northerly outflow winds across the northern inner channels and warmer southerly winds across the southern panhandle. Portions of the central and southern panhandle will see moderate to heavy snowfall through Sunday evening as another surge of moisture pushes into the area. A transition to a rain snow mix is expected through Monday morning for the southern panhandle up to Sumner Strait. Main forecast challenge is potential for temperatures to warm up quicker than expected through Sunday night and into Monday morning with the front moving further north, limiting snowfall accumulations. Another system will bring more accumulating snow to the panhandle Monday night into Tuesday night. The track of this follow up feature could lead to significant swings in snow accumulations from Frederick Sound northward to the Icy Strait corridor. * WHAT...Heavy snow. Additional snow accumulations of 5 to 8 inches. * WHERE...Petersburg Borough. * WHEN...Until 9 AM AKST Monday. * IMPACTS...Travel will be very difficult. * ADDITIONAL DETAILS...The heaviest snowfall is expected Sunday night into Monday morning. Snow will gradually transition to a rain snow mix through Monday morning. More snow is expected Tuesday, however rising snow levels are expected to begin limiting accumulations.
INSTRUCTION: If you must travel, keep an extra flashlight, food, and water with you in case of an emergency. People are urged to prepare their property before the onset of winter weather. For the latest road conditions, where available, call 5 1 1 or visit 511.alaska.gov.
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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
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
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