The National Weather Service issued a Flood Advisory for west central La Salle County, Illinois, at 11:58 p.m. CDT on August 21, effective until 6:00 a.m. CDT on August 22. The advisory warns of localized flooding caused by excessive rainfall, with radar and rain gauges indicating more than 4 inches of rain in the area. Minor flooding is possibly occurring, affecting creeks, streams, and roads, including in Tonica and Lostant.
KEY FACTS
- The advisory covers west central La Salle County, including Tonica and Lostant.
- Doppler radar and automated gauges indicated rainfall exceeding 4 inches by 11:55 p.m. CDT.
- Minor flooding is possibly occurring, with creeks and streams potentially rising out of their banks.
- The advisory is in effect until 6:00 a.m. CDT on August 22.
CONTEXT
The Flood Advisory was issued by the National Weather Service office in Chicago, which monitors weather conditions for northern Illinois. The advisory is a lower severity alert compared to a Flood Warning, indicating that flooding is imminent or occurring but not yet severe enough to warrant a warning. The affected area is rural, with small communities like Tonica and Lostant potentially experiencing road flooding and rising waterways. The National Weather Service advises residents to monitor conditions and avoid flooded roads. This event follows a broader pattern of heavy rainfall in the region, though no additional details on broader impacts were provided in the advisory.
WHY IT MATTERS
Localized flooding can disrupt transportation and pose risks to residents in affected areas. Even minor flooding can make roads impassable and threaten property. The advisory highlights the need for residents to stay informed and take precautions during periods of intense rainfall, especially in areas prone to flash flooding.
WHAT TO WATCH
- Monitor local weather updates for potential upgrades to a Flood Warning.
- Watch for road closures or flooding in low lying areas, especially near creeks and streams.
- Be aware of rising water levels in Tonica and Lostant and surrounding areas.