Last mentioned: Mar 23, 2026
Peak Intensity
Las Vegas records its hottest March day in over 50 years, reaching triple digits in some areas.
Red Flag Warnings
National Weather Service issues widespread fire weather warnings for NV, AZ, and CA.
Initial Records Broken
Southern California coastal and inland regions see temperatures hit 90+ degrees.
Heat Dome Forms
High-pressure system begins building over the Great Basin, trapping warm air.
An unprecedented March heat wave is shattering temperature records across the US Southwest, triggering urgent fire weather warnings. The early-season surge is straining local infrastructure and signaling a potentially volatile wildfire season ahead.