Weather Alert in Alaska
Special Weather Statement issued March 19 at 2:09PM AKDT by NWS Juneau AK
AREAS AFFECTED: City and Borough of Sitka; Petersburg Borough; Western Kupreanof and Kuiu Island; Prince of Wales Island; City and Borough of Wrangell; Ketchikan Gateway Borough; Annette Island
DESCRIPTION: Snow showers will continue to impact the region through the end of the week, with snow accumulations being limited during the daytime hours. Confidence is increasing on seeing a more significant round of snow this weekend, as cold temperatures aloft remain in place and we see more moisture move in. There remains a lot of uncertainty for snow accumulations at the surface as we are starting to see warmer day time temperatures into the mid to high 30s to around 40 due to increasing daylight and sun angle. Temperatures aloft are still more favorable for accumulating snow amounts. If the precipitation rates are significant enough to overcome the warmer surface temperatures, snow accumulations will be greater. But if the temperatures are able to overcome the precipitation rates, snowfall will be limited as it melts by the time it reaches the surface. This will need to be monitored for any changes in potential snow accumulation. The orientation of the low and where the showers move into the panhandle will also impact the snow amounts, with how northward and inland the heavier moisture will push and how organized the band of showers is expected to be when moving through this weekend. Stay tuned for the latest forecast updates at weather.gov/juneau.
INSTRUCTION: N/A
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Weather Topic: What are Nimbostratus Clouds?
Home - Education - Cloud Types - Nimbostratus Clouds
Next Topic: Precipitation
A nimbostratus cloud is similar to a stratus cloud in its formless,
smooth appearance. However, a nimbostratus cloud is darker than a stratus cloud,
because it is thicker.
Unlike a stratus cloud, a nimbostratus cloud typically brings with it the threat
of moderate to heavy precipitation. In some cases, the precipitation may evaporate
before reaching the ground, a phenomenon known as virga.
Next Topic: Precipitation
Weather Topic: What is Rain?
Home - Education - Precipitation - Rain
Next Topic: Shelf Clouds
Precipitation in the form of water droplets is called rain.
Rain generally has a tendency to fall with less intensity over a greater period
of time, and when rainfall is more severe it is usually less sustained.
Rain is the most common form of precipitation and happens with greater frequency
depending on the season and regional influences. Cities have been shown to have
an observable effect on rainfall, due to an effect called the urban heat island.
Compared to upwind, monthly rainfall between twenty and forty miles downwind of
cities is 30% greater.
Next Topic: Shelf Clouds
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