Check tire pressures when the tires are cold, using the recommended values on the vehicle's tire-information label rather than the maximum molded into the tire. A warning should not be dismissed merely because the weather has changed.
A flashing light followed by a steady light can indicate a monitoring-system fault; consult the manual. If a tire is visibly damaged or the vehicle handles abnormally, stop safely. Contact 12th Street Auto Care Center with the pressure readings and any warning behavior you observed.