A flash flood warning was in effect for Castle Valley and the Moab area until 8:45 p.m. Thursday, July 16, as an anomalous plume of moisture moved into western Utah and eastern Colorado.
Flood Risks Near Burn Scars
The National Weather Service in Grand Junction issued the hydrologic alert for the region, noting that localized heavy rainfall has the potential to produce flash flooding and debris flows. This risk is particularly high in vulnerable terrain, including areas near or downstream of recent burn scars.
High Moisture Levels
According to the National Weather Service, the moisture plume is bringing significantly higher levels of precipitable water to the area, with some models suggesting levels as high as 200% of normal. This influx of moisture has already primed the atmosphere, with recent storms in southwest Colorado reporting over 0.5 inches of rain within a 30-minute period.
The agency warned that such intense rainfall can trigger rapid flooding in steep, rocky terrain, especially where ground cannot effectively absorb water.
Ongoing Storm Forecast
The weather pattern is expected to persist throughout the week, with terrain-based showers and thunderstorms favoring the San Juan Mountains each afternoon. Forecasts indicate these storms may spread further north toward the weekend.
While this moisture provides relief for drought conditions, it also maintains a continuous threat of flash flooding in the area.
Vehicle Safety Warnings
The National Weather Service emphasizes the importance of flood safety, specifically through its "Turn Around Don't Drown" initiative. The agency notes that more deaths occur annually from flooding than from any other thunderstorm-related hazard.
Officials warn that motorists should never attempt to drive around barriers blocking flooded roads, as roadbeds may have collapsed under the water. The agency reports that just 12 inches of rushing water can carry away most cars, while 2 feet of water is enough to sweep away even large SUVs and trucks.
Upcoming Temperature Trends
Looking ahead, temperatures in Castle Valley are expected to gradually decrease throughout the week due to increased cloud cover. While daytime highs may reach the low 90s, nighttime lows are forecasted to remain in the low 70s.
