claude-opus-5 Analysis · Sep 13, 2026
Unsafe
HIGH RISK
claude-opus-5
85% confidence
Summary
A Flash Flood Warning is in effect until 10:00 AM EDT and a Flood Watch until noon, with heavy thunderstorms and 1-2 inches of rain through late morning. Conditions clear rapidly after midday, turning partly to mostly sunny, calm, and dry through the evening.
Hourly Forecast
7 AM 85%
1 mph
8 AM 82%
1 mph
9 AM 63%
1 mph
10 AM 62%
2 mph
11 AM 21%
3 mph
12 PM 8%
3 mph
1 PM 6%
5 mph
2 PM 4%
5 mph
3 PM 3%
5 mph
4 PM 4%
5 mph
5 PM 3%
5 mph
6 PM 0%
3 mph
7 PM 0%
2 mph
8 PM 0%
2 mph
9 PM 0%
2 mph
10 PM 0%
2 mph
11 PM 0%
2 mph
Key Factors
- 01 Flash Flood Warning (severe, immediate) until 10:00 AM EDT for southeastern Morris County; flooding of highways, streets, underpasses and low-lying areas ongoing
- 02 Flood Watch in effect until 12:00 PM EDT for a broad area of NJ, southeast PA and northern DE
- 03 Showers and thunderstorms with 82-85% precipitation chance 7-9 AM, 62-63% through 11 AM; rainfall rates of 1-2 inches per hour
- 04 Storm total rainfall of 1-2 inches on already saturated ground increases hydroplaning and standing-water risk
- 05 100% relative humidity early morning may reduce visibility; no explicit visibility data provided
- 06 Winds are light (1-5 mph) all day, so crosswind risk is negligible; temperatures 68-81F mean no ice risk
- 07 Conditions improve markedly after noon: only 8% or less precipitation chance, dry and clear through the evening
Confidence
85%
Recommendation
Avoid driving until at least noon, especially 7:00-10:00 AM while the Flash Flood Warning is active; never drive through flooded roadways - turn around, don't drown. Safer windows: late morning 11:00 AM-12:00 PM (after the warning expires, but still use caution for lingering standing water and residual flooding), and evening 6:00-10:00 PM, which is dry, clear and calm. Watch for closed or washed-out roads and debris even after the rain ends.