Dangerous Heat Spike Today

Metro Heat Index May Approach 110F By 5 PM

Paul Douglas
June 29, 2018 - 10:44 am
Heat Warning Heat Wave

Paul Douglas

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Welcome to a 2-shower day, in fact today should be one of the 2 or 3 hottest days of the entire summer season, statewide. The combination of upper 90s and dew points in the low 70s will create a heat index in the 105-110F range by late afternoon. Congo-hot. A few headlines:

* An Excessive Heat Warning is in effect for most of central and southern Minnesota, including the Twin Cities metro. That means that dangerous levels of heat are likely/imminent.

* The "Urban Heat Island" will magnify heat in and near the MSP metro area. More asphalt and concrete will result in air temperatures and heat indices at least 4-8F hotter than surrounding outlying suburbs.

* This is a one-day heat spike - we expect some relief tomorrow and Sunday as a slightly cooler front pushes T-storms across the state. More 90s are likely the latter half of next week.

Excessive Heat Warning
Praedictix and AerisWeather

NOAA Advisories. Excessive heat will grip much of the Midwest and central USA today, spreading to the east coast over the weekend. Much of America east of the Rockies will bake under a sprawling heat wave the next 2 weeks, based on the latest computer guidance.

Friday Highs
Praedictix and AerisWeather

Projected Highs. Expect mid to upper 90s across central and southern Minnesota today; a cooling breeze limited to Lake Superior's North Shore.

Heat Index

Peak Heat. It's not the heat - it's the humidity. There's a lot of truth to that statement. When there is this much water in the air with dew points in the 70s, your body can't cool itself naturally via evaporation of sweat off your skin. It's much easier to overheat. The heat index may approach 110F in some areas by late afternoon.

Hot Weather Risks
NOAA

Hot Weather Tips. Heat exhaustion often leads to cramping. Skin is sweaty and clammy. If the skin is dry with rapid heartbeat, shallow breathing and severe disorientation, heat stroke is very possible. Heat stroke can be fatal if not treated promptly. Here are a few steps you can take to lower your risk:

* Try as much as possible to avoid direct sunshine this afternoon.

* Slow down, stay hydrated - drink extra water, even if you don't feel thirsty.

* Light-weight, light-colored (cotton) clothing will increase comfort levels.

* Check in on older friends and neighbors to make sure they're staying cool. Newborn infants, people with chronic illnesses and the elderly are most susceptible to hot weather ailments.

* Don't even think about leaving a child (or a pet) in a car, even for just a few minutes. Temperatures can spike as high as 120-130F in a matter of minutes, with potentially deadly implications.

Hot Weather Pets
NOAA

Pets Feel the Heat Too. Dogs, cats and horses are susceptible to hot weather,  just like people. Make sure your pet has plenty of extra water - consider bringing them indoors during the hottest time of the day.

Temperatures cool into the 80s over the weekend and early next week, but more 90s are shaping up next week, just in time for the 4th of July. Today is the 9th day above 90F this year. Average is 13 days of 90s during a summer, but at the rate we're going I expect to see closer to 20 or 25 days above 90F before September. Stay tuned...and stay cool!