Weather Alert in Wisconsin
Air Quality Alert issued July 31 at 10:52AM CDT by NWS Twin Cities/Chanhassen MN
AREAS AFFECTED: Polk; Barron; Rusk; St. Croix; Pierce; Dunn; Pepin; Chippewa; Eau Claire
DESCRIPTION: The Wisconsin Department of Natural Resources has issued an Air Quality Advisory for the following counties: Barron, Chippewa, Dunn, Eau Claire, Pepin, Pierce, Polk, Rusk, St. Croix. WHAT...The PM2.5 AQI is expected to reach the Unhealthy for Sensitive Groups (USG) to Unhealthy level. WHERE...All of Wisconsin. WHEN...Until noon Friday, August 1.
INSTRUCTION: Sensitive groups: Consider rescheduling or moving all activities inside. Go inside if you have symptoms. People with asthma: Follow your asthma action plan and keep quick-relief medicine handy. People with heart disease: Symptoms such as palpitations, shortness of breath, or unusual fatigue may indicate a serious problem. If you have any of these, contact your health care provider. Everyone else: Keep outdoor activities shorter and less intense. Go inside if you have symptoms. Additional Details: Canadian wildfire smoke will continue to impact Wisconsin`s surface air quality over the next several days. Widespread Unhealthy (Red) AQI for PM2.5 is expected across Wisconsin on Thursday, with NowCast AQI values in the Very Unhealthy (Purple) category possible. Conditions are expected to slowly improve beginning Friday. However, Unhealthy for Sensitive Groups (Orange) to Unhealthy (Red) AQI will remain possible through the weekend. Conditions will be reevaluated on a day-to-day basis through the weekend, including updates to the forecast and any associated Air Quality Advisories. For more information on current air quality, please see: https://airquality.wi.gov
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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
Weather Topic: What is Snow?
Home - Education - Precipitation - Snow
Next Topic: Stratocumulus Clouds
Snow is precipitation taking the form of ice crystals. Each ice crystal, or snowflake,
has unique characteristics, but all of them grow in a hexagonal structure.
Snowfall can last for sustained periods of time and result in significant buildup
of snow on the ground.
On the earth's surface, snow starts out light and powdery, but as it begins to melt
it tends to become more granular, producing small bits of ice which have the consistency of
sand. After several cycles of melting and freezing, snow can become very dense
and ice-like, commonly known as snow pack.
Next Topic: Stratocumulus Clouds
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