gpt-5.6-luna Analysis · Jul 21, 2026
Driving conditions are hazardous today due to widespread thunderstorms, heavy rainfall, and an active Flood Watch. The greatest risk is this afternoon through tonight, when torrential rain could cause flash flooding, including in urban and low-lying areas.
- 01 Flood Watch is active through late tonight, with possible flooding of rivers, streams, poor-drainage areas, and urban locations.
- 02 Thunderstorms are likely much of the day, with precipitation probabilities generally 50% to 98%.
- 03 The forecast indicates heavy rain, with 1 to 2 inches possible today and tonight; storms could produce 2 to 3 inches per hour.
- 04 The most widespread storm activity is expected this afternoon and evening, with the highest hourly precipitation probabilities from approximately 5pm to 10pm.
- 05 Visibility data is not provided, so reduced visibility during heavy rain cannot be quantified.
- 06 Wind speeds of 5 to 12 mph are not the primary concern, but wet roads and thunderstorms increase driving risk.
Avoid unnecessary driving, especially from approximately 1pm through midnight and during any active thunderstorm or Flash Flood Warning. If travel is essential, the relatively safer morning slot is 7am-8am, before storms become more likely, though showers remain possible. The relatively safer evening slot is not advisable; if travel cannot be avoided, use 10pm-midnight only after checking for warnings and road flooding, recognizing that thunderstorms and heavy rain remain likely. Never drive through flooded roads.