gpt-5.1 Analysis · Sep 13, 2026
Unsafe
HIGH RISK
gpt-5.1
90% confidence
Summary
Dangerous flash flooding from heavy thunderstorms is occurring this morning, with conditions improving to mostly dry and calm by midday and into the evening. Driving is hazardous in flood‑prone and low‑lying areas until late morning, then generally much safer afterward.
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 Active Flash Flood Warning until 10:00 AM EDT with flash flooding ongoing or expected to begin shortly, specifically mentioning flooding of highways, streets, and underpasses
- 02 Very heavy morning rain from showers and thunderstorms before noon, with additional 1–2 inches of rainfall possible, greatly increasing the risk of rapidly changing water levels on roads
- 03 High rain probabilities and 100% relative humidity from 7–10 AM, implying saturated conditions and poor drainage even after the heaviest storms move through
- 04 Flood Watch in effect until noon, indicating continued potential for flooding of rivers, creeks, and other low-lying locations through late morning
- 05 Roadway flooding is explicitly noted as an impact in the warning, and official guidance advises not to drive through flooded roads
- 06 Conditions improve significantly after late morning, with low rain chances and light winds (generally 1–5 mph) from midday through the evening, making later travel much safer
Confidence
90%
Recommendation
Avoid driving during the flash flood window this morning, especially from now through about 10:00 AM, and if possible wait until a safer late-morning period such as 11:00 AM–1:00 PM when storms have largely ended and flooding risk is decreasing. For evening travel, conditions look favorable and generally dry, with a safer window around 6:00 PM–8:00 PM when skies are partly cloudy to mostly clear and winds are light.