A steamy Saturday; scattered showers and thunderstorms at times
A severe thunderstorm is possible
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Our average Twin Cities high temp is 83 degrees this time of year. We’re shooting for 90 this Saturday afternoon. Southern Minnesota will see some lower 90s, with 80s in central and northern Minnesota:
Dewpoints will be in the steamy 70s:
Due to our combination of hot temperatures and high dew points, the National Weather Service has issued an excessive heat warning for the Twin Cities metro area until 8 p.m. this Saturday, with a heat advisory across much of the southern half of Minnesota and into west-central and southwestern Wisconsin:
Here are details of the excessive heat warning in the Twin Cities:
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URGENT - WEATHER MESSAGE National Weather Service Twin Cities/Chanhassen MN 639 AM CDT Sat Jul 25 2020 MNZ060>063-068>070-252000- /O.CON.KMPX.EH.W.0003.000000T0000Z-200726T0100Z/ Hennepin-Anoka-Ramsey-Washington-Carver-Scott-Dakota- Including the cities of Minneapolis, Blaine, St Paul, Stillwater, Chanhassen, Chaska, Victoria, Shakopee, and Hastings 639 AM CDT Sat Jul 25 2020 ...EXCESSIVE HEAT WARNING REMAINS IN EFFECT UNTIL 8 PM CDT THIS EVENING... * WHAT...Dangerously hot conditions with heat index values up to 103. * WHERE...Scott, Carver, Washington, Ramsey, Anoka, Hennepin and Dakota Counties. * WHEN...Until 8 PM CDT this evening. * IMPACTS...Extreme heat and humidity will significantly increase the potential for heat related illnesses, particularly for those working or participating in outdoor activities. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1.
Here are some of the peak heat index values that are forecast for Saturday afternoon:
Note the statement about cloud cover, and how it may affect heat index values in some areas.
Thunderstorm chances
There were areas of rain and embedded thunderstorms in northern, central and western Minnesota early Saturday morning, tracking northeastward. Minnesota and western Wisconsin will continue to see some showers and thunderstorms at times today and tonight, with some rain-free hours at most locations too.
The National Weather Service Storm Prediction Center shows a marginal risk of severe weather in Minnesota and western Wisconsin this Saturday and Saturday night:
Marginal risk indicates that an isolated severe thunderstorm is possible.
This Updraft blog will be updated by around 10 a.m. with updated info on your weekend weather and a look at the week ahead.
Programming note
You can hear my live weather updates on MPR News at 7:35 a.m., 9:35 a.m. and 4:35 p.m. each Saturday and Sunday.
