claude-sonnet-5-5 Analysis · Aug 20, 2026
Unsafe
HIGH RISK
claude-sonnet-5-5
85% confidence
Summary
Morning is dry and calm, but a Flood Watch covers Morris County from noon through late tonight, with multiple rounds of showers and thunderstorms and possible flash flooding from the afternoon into the evening.
Hourly Forecast
7 AM 1%
3 mph
8 AM 3%
3 mph
9 AM 3%
3 mph
10 AM 9%
3 mph
11 AM 14%
2 mph
12 PM 23%
3 mph
1 PM 32%
5 mph
2 PM 56%
6 mph
3 PM 69%
6 mph
4 PM 80%
6 mph
5 PM 76%
7 mph
6 PM 75%
6 mph
7 PM 57%
7 mph
8 PM 46%
6 mph
9 PM 38%
6 mph
10 PM 27%
5 mph
11 PM 17%
5 mph
Key Factors
- 01 Flood Watch for Morris County (northern NJ): flash flooding possible from noon today through late tonight, with the alert running until 2:00 AM EDT Aug 21
- 02 Rainfall rates of 1 to 3 inches per hour possible, with 1 to 2 inches expected and localized 3 to 5 inches
- 03 Precipitation chance climbs from 23% at noon to 56% at 2 PM, then 69-80% from 3 PM to 7 PM, with thunderstorms likely
- 04 Poor drainage, urban areas, and low-lying roads may flood; creeks and streams may overflow
- 05 Heavy downpours and thunderstorms will cut visibility and raise hydroplaning risk
- 06 Showers and thunderstorms continue at 27-57% per hour from 7 PM to 11 PM, with patchy fog forecast 3-5 AM
- 07 Visibility data and wind gusts are not provided, so those hazards are uncertain; winds are light at 2-7 mph and temperatures are well above freezing, so there is no ice risk
Confidence
85%
Recommendation
Do essential driving in the morning, ideally 7:00-11:00 AM, when it is dry with light wind and low precipitation chances. Avoid driving from about noon to 9 PM, and especially 2-8 PM, when flash flooding is most likely. If you must drive in the evening, the safest window is roughly 9:30-11:00 PM, once the chance of showers falls to about 38% or lower, but only if no Flash Flood Warning is active. Never drive through flooded roads, and check for warnings before leaving.