The National Weather Service has issued an Extreme Heat Warning for New Glarus and much of southern Wisconsin beginning at noon Monday and continuing through 7 p.m. Tuesday, warning that dangerously hot and humid conditions will push heat index values as high as 106 degrees. Forecasters say the dangerous heat will likely persist beyond Tuesday, with temperatures remaining in the 90s through much of the week.

The combination of oppressive humidity, daytime heat and unusually warm nights will create particularly hazardous conditions. Overnight heat index values are expected to remain in the upper 70s, offering little relief and increasing the risk of heat-related illnesses, especially for older adults, young children, outdoor workers, people with chronic medical conditions and anyone without access to air conditioning. The National Weather Service's Heat Risk forecast continues to place southern Wisconsin, including the New Glarus area, in its highest "Extreme" category.

Unlike brief summer hot spells, this event is expected to offer little overnight relief. Overnight lows are forecast to remain in the 70s much of the week, making it harder for homes and buildings without air conditioning to cool down.

Forecasters warn that the cumulative effects of several days of extreme heat can be especially dangerous for older adults, young children, people with chronic medical conditions, outdoor workers and anyone without reliable access to air conditioning.

The Forecast

Sunday will provide the last relatively comfortable day before the heat arrives. A 40% chance of showers is expected mainly between 7 a.m. and 1 p.m., followed by partly sunny skies and a high near 85 degrees.

The heat begins Monday with mostly sunny skies and a high near 92 degrees. Gusty south winds could reach 25 mph, while temperatures Monday night only fall to around 77 degrees.

Tuesday remains mostly sunny with a high near 93 degrees. A slight chance of overnight thunderstorms arrives after 1 a.m., but temperatures will only cool to about 76 degrees.

Wednesday brings another hot day with a high near 93 degrees under mostly sunny skies. A slight chance of afternoon thunderstorms develops, with an overnight low around 75 degrees.

Thursday may be the hottest day of the stretch, reaching about 94 degrees. Another slight chance of showers and thunderstorms is in the forecast.

By Friday, highs are expected to remain around 92 degrees, with showers and thunderstorms becoming more likely as a cold front approaches.

Heat Index Could Top 100 Degrees

While forecast air temperatures are expected to remain in the low to mid-90s, the high humidity will make it feel considerably hotter. Heat index values over 100 degrees are expected during the afternoons whenever sunshine prevails.

The National Weather Service warns that prolonged exposure to these conditions can quickly lead to heat exhaustion or life-threatening heat stroke.

How to Stay Safe

Health officials recommend taking several precautions throughout the week:

• Drink plenty of water, even if you don't feel thirsty.• Avoid strenuous outdoor work or exercise during the hottest part of the afternoon.• Take frequent breaks in air-conditioned buildings or shaded areas.• Wear lightweight, loose-fitting, light-colored clothing.• Never leave children, older adults or pets unattended in a vehicle, even for a few minutes.• Check frequently on elderly neighbors, relatives and anyone living alone.• Make sure pets have constant access to fresh water and shade, and avoid walking them on hot pavement.

Know the Warning Signs

Heat exhaustion may include heavy sweating, weakness, dizziness, nausea, headache and cool, clammy skin. Move the person to a cooler location, loosen clothing and provide cool water if they are alert.

Heat stroke is a medical emergency. Symptoms include a body temperature above 103 degrees, confusion, loss of consciousness, hot skin or seizures. Call 911 immediately if someone shows signs of heat stroke.

Residents are encouraged to monitor the latest forecasts throughout the week, as heat advisories or excessive heat warnings may be issued if conditions continue to worsen. The National Weather Service notes that heat remains one of the deadliest weather hazards in the United States, causing hundreds of deaths and thousands of heat-related illnesses each year.

– Stay with New Glarus 360 for updates on the incoming heat wave, local weather alerts and any changes to the forecast as the week unfolds.

– Source: National Weather Service

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