claude-opus-5-5 Analysis · Sep 13, 2026
Unsafe
HIGH RISK
claude-opus-5-5
85% confidence
Summary
A Flash Flood Warning is in effect until 10:00 AM EDT and a Flood Watch until noon, with showers and thunderstorms (60-85% chance) through about 11 AM, so morning driving is hazardous. Conditions improve sharply after noon, with dry, light-wind weather through the afternoon and 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, including Morristown, Madison, Florham Park, Boonton and Rockaway, with rain rates of 1-2 inches per hour and ongoing flooding of highways, streets and underpasses.
- 02 Flood Watch until 12:00 PM EDT covering much of NJ, southeast PA and northern DE.
- 03 Showers and thunderstorms are expected 7-11 AM (85% at 7 AM, 62-63% at 9-11 AM), with 1-2 inches of new rain possible before noon, bringing reduced visibility, hydroplaning risk and lightning.
- 04 100% humidity early in the morning may reduce visibility, though no visibility data was provided.
- 05 Flooded low-lying roads and creeks may persist for a while after the rain ends.
- 06 Winds stay light all day (1-9 mph), so crosswinds are not a concern, and temperatures of 64-81F rule out any ice risk.
- 07 Only a 20% chance of showers after 4 AM tomorrow.
Confidence
85%
Recommendation
Avoid driving before noon, especially 7-11 AM during the Flash Flood Warning, and never drive through flooded roads or underpasses (turn around, don't drown). The safer morning-to-midday window is 12:00-2:00 PM, when rain chances drop below 10%, though you should still watch for lingering standing water in low spots. The best evening window is 6:00-10:00 PM, which is dry (0% precipitation) with light winds.