The Brief Heat index values approach 105 with isolated late-day storms. Pacific Northwest wildfires spread smoke across much of the country. Highs climb into the upper 90s today, with humidity pushing the heat index near 105. Wildfire smoke crosses the countryA widespread smoke plume is being fed by wildfires in the Pacific Northwest. Upper-level winds are carrying much of the smoke across the United States, creating hazier skies, although most of it should remain above ground level around Houston.