 Heat index values today up to about 98 degrees. That's what it will feel like, and that's in Stratford, eastern Hillsborough, interior Rockingham County, York County. That heat advisory in effect from noon today to about 8 tonight. The hot temperatures and high humidity can cause heat illnesses. You need to drink plenty of fluids, stay hydrated, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.