Sioux Falls Starting Week With an Excessive Heat Watch

The Sioux Falls area could see temperatures into the 100s this week. That combined with humid conditions has prompted the National Weather Service to issue an Excessive Heat Watch for much of eastern South Dakota including Sioux Falls Monday afternoon through Wednesday Evening (August 20-22, 2023).

"Extreme heat and humidity will significantly increase the potential for heat-related illnesses, particularly for those working or participating in outdoor activities," The National Weather Service says.

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MORE: What’s a Heat Dome? And Will It Bring South Dakota’s Warmest Temp Ever?

URGENT - WEATHER MESSAGE
National Weather Service Sioux Falls SD
245 PM CDT Sat Aug 19 2023

IAZ001>003-012>014-020>022-031-032-MNZ071-072-080-081-089-090-097-
098-NEZ013-014-SDZ050-056-062>071-200430-
/O.NEW.KFSD.EH.A.0001.230821T1700Z-230824T0300Z/
/O.CON.KFSD.HT.Y.0005.000000T0000Z-230820T0200Z/
Lyon-Osceola-Dickinson-Sioux-O`Brien-Clay-Plymouth-Cherokee-
Buena Vista-Woodbury-Ida-Lincoln-Murray-Cottonwood-Nobles-Jackson-
Pipestone-Rock-Dixon-Dakota-Gregory-Moody-Minnehaha-Charles Mix-
Douglas-Hutchinson-Turner-Bon Homme-Yankton-Union-
Including the cities of Rock Rapids, George, Inwood, Larchwood,
Sibley, Spirit Lake, Milford, Arnolds Park, Sioux Center,
Orange City, Rock Valley, Hawarden, Hull, Sheldon, Hartley,
Sanborn, Spencer, Le Mars, Cherokee, Storm Lake, Sioux City,
Ida Grove, Holstein, Battle Creek, Tyler, Hendricks, Lake Benton,
Ivanhoe, Marshall, Slayton, Fulda, Windom, Mountain Lake,
Worthington, Jackson, Lakefield, Pipestone, Luverne, Wakefield,
Ponca, Allen, South Sioux City, Gregory, Burke, Flandreau,
Sioux Falls, Wagner, Platte, Lake Andes, Marty, Armour, Corsica,
Delmont, Parkston, Freeman, Menno, Tripp, Clayton, Parker,
Centerville, Marion, Viborg, Irene, Hurley, Chancellor, Canton,
Lennox, Tea, Harrisburg, Tyndall, Scotland, Springfield, Avon,
Tabor, Yankton, Vermillion, North Sioux City, Beresford,
Elk Point, Alcester, and Jefferson
245 PM CDT Sat Aug 19 2023

...HEAT ADVISORY REMAINS IN EFFECT UNTIL 9 PM CDT THIS EVENING...
...EXCESSIVE HEAT WATCH IN EFFECT FROM MONDAY AFTERNOON THROUGH
WEDNESDAY EVENING...

* WHAT...For the Heat Advisory, heat index values up to 110. For
  the Excessive Heat Watch, dangerously hot conditions with heat
  index values up to 110 possible.

* WHERE...Portions of northwest and west central Iowa, southwest
  Minnesota, northeast Nebraska and east central, south central
  and southeast South Dakota.

* WHEN...For the Heat Advisory, until 9 PM CDT this evening. For
  the Excessive Heat Watch, from Monday afternoon through
  Wednesday 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...

Monitor the latest forecasts and warnings for updates on this
situation. Be prepared to 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. This is especially true during
warm or hot weather when car interiors can reach lethal
temperatures in a matter of minutes.