DES MOINES, Iowa—The National Weather Service Office in Des Moines has expanded the Heat Warning to cover a larger portion of Iowa until Friday evening.

URGENT - WEATHER MESSAGE
National Weather Service Des Moines IA
233 AM CDT Fri Jul 28 2023

...EXCESSIVE HEAT WARNING IN EFFECT UNTIL 9 PM CDT THIS EVENING...

* WHAT...Dangerously hot conditions with heat index values up to
  110. Locally higher values possible.

* WHERE...Central and southern Iowa.

* WHEN...Until 9 PM CDT this evening.

* IMPACTS...Hot temperatures and high humidity may cause heat
  illnesses to occur.

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.

(contributed information, NWS)