gpt-5.4 Analysis · May 20, 2026
Safe
MEDIUM RISK
gpt-5.4
85% confidence
Summary
Driving is generally safest this morning through early afternoon, with dry, sunny conditions and light to moderate winds. Risk increases from about 1 PM onward due to developing showers and thunderstorms, especially from 4 PM to 7 PM and again near 10 PM, while hot conditions persist until 8 PM under a Heat Advisory.
Hourly Forecast
7 AM 2%
6 mph
8 AM 2%
8 mph
9 AM 2%
9 mph
10 AM 2%
10 mph
11 AM 4%
10 mph
12 PM 10%
12 mph
1 PM 18%
12 mph
2 PM 29%
12 mph
3 PM 40%
13 mph
4 PM 52%
13 mph
5 PM 64%
12 mph
6 PM 65%
12 mph
7 PM 34%
9 mph
8 PM 45%
8 mph
9 PM 45%
8 mph
10 PM 63%
7 mph
11 PM 39%
7 mph
Key Factors
- 01 Heat Advisory is in effect until 8:00 PM EDT, with heat index values up to the low-to-mid 90s, which can affect driver comfort and vehicle readiness during stops.
- 02 Hourly forecast stays dry through midday, with only 2-10% precipitation chances before 1 PM.
- 03 Showers and thunderstorms begin to develop around 1 PM and become more likely late afternoon and early evening.
- 04 Highest storm risk is around 4 PM to 7 PM, with precipitation chances 52-65% and 'Showers And Thunderstorms Likely' in the forecast.
- 05 Another higher-risk period appears around 10 PM, when showers and thunderstorms are again likely (63%).
- 06 Winds are not extreme, but daily forecast notes gusts up to 23 mph, which may accompany storms.
- 07 Visibility data is not provided, so any storm-related visibility reduction cannot be assessed directly.
Confidence
85%
Recommendation
Best morning driving window: 8:00 AM-12:00 PM EDT. Best evening driving window: 7:00 PM-8:00 PM EDT, though there is still some storm chance and you should check radar before leaving. Avoid non-essential driving from 4:00 PM-7:00 PM EDT, and use extra caution again around 10:00 PM when thunderstorms are likely.