LAS VEGAS (KTNV) — MORNING: A warm start in the upper 80s and low 90s around Las Vegas with sun and light winds. AFTERNOON: Sunny with highs near 112° and southwest winds at 10-20 mph. The heat risk remains "major" to "extreme" through the weekend and the Extreme Heat Warning runs through Saturday. The UV index is strong enough between 10 a.m. and 4 p.m. that a sunburn can happen in just 15 to 30 minutes. Forecast pollen levels are "low" this week, with ragweed and chenopods listed as the predominant pollen types.