HOUSTON, Texas (Reuters/Bloomberg) — A deep surge of Gulf moisture is fueling a dangerous multi-day flood risk across Southeast Texas, with the heaviest storms expected Sunday evening through midweek. The National Weather Service has issued a flood watch for Harris County and surrounding areas effective through Wednesday.
H2: Current Houston Weather Radar Overview (Sunday, July 12)
A broad band of tropical moisture is streaming inland from the Gulf of Mexico. Scattered heavy showers and thunderstorms are already developing south of I-10.
Active flood advisories are in effect for Harris, Matagorda, Wharton, and Sabinal counties. Street flooding risks are elevated in low-lying areas and underpasses.
Hour-by-hour timeline: Morning isolated showers (6 AM – 12 PM) → afternoon storm intensification (12 PM – 6 PM) → evening peak rain bands with possible urban flooding (6 PM – Midnight).
H2: Sunday Storm Timeline: When & Where Flood Risks Peak
Morning (6 AM – 12 PM): Light to moderate showers begin, mainly south of I-10. Flood risk is low but roads are wet.
Afternoon (12 PM – 6 PM): Storms become more widespread as Gulf moisture surges inland. Street flooding is likely in low-lying areas and underpasses.
Evening (6 PM – Midnight): Peak storm activity. Training thunderstorms are possible, leading to rapid water accumulation. Flood advisories are likely upgraded to warnings.
Overnight: Lingering showers taper off. Saturated ground keeps flood risk elevated through Monday morning commute.
H2: Gulf Moisture Fuels Dangerous Rain Through Midweek
The source is a deep tropical flow from the Gulf of Mexico. It pulls high humidity and instability into the Houston region.
Daily rain chances: Monday (70%) through Wednesday (60%). Each afternoon brings renewed thunderstorm development.
Accumulation forecast: 2 to 4 inches total through Wednesday. Isolated higher amounts up to 6 inches are possible in slow-moving storms.
Why this pattern is dangerous: Repeated heavy rain on already saturated soils increases flash flood risk. Slow drainage in urban areas compounds the problem.
H2: Houston Flood Safety Precautions – What to Do Now
Before the storm: Clear drains and gutters. Prepare an emergency kit with flashlights, batteries, and water. Charge devices.
During heavy rain: Avoid driving through standing water. ‘Turn Around, Don’t Drown.’ Seek higher ground if water rises.
Stay informed: Enable mobile weather alerts from FEMA and local news apps. Monitor NOAA Weather Radio for flash flood warnings.
If flooding occurs: Move to upper floors. Avoid electrical hazards. Call 911 only for life-threatening emergencies.
H2: Frequently Asked Questions About Houston Flood Risk This Week
Q: Will Sunday’s storms cause major flooding like previous events?
A: While not a hurricane-level event, training storms could produce rapid street flooding. Stay vigilant.
Q: When will the rain stop?
A: Drier conditions expected by Thursday as high pressure builds. Isolated showers may linger.
Q: Are there any watches or warnings I should know?
A: A flood watch is in effect for most of Southeast Texas through Wednesday. Check local advisories.
Q: How does this compare to the July 12 morning forecast?
A: The morning forecast highlighted increasing moisture. The risk is now materializing with stronger storms.
H2: Related Houston Weather Updates & Resources
For real-time tracking, refer to FOX 26 Houston live radar and webcams. KSAT’s Gulf moisture article provides regional context for San Antonio impacts. Click2Houston’s weekend rain timeline offers historical comparison.
Download our free weather app for push alerts on flood warnings. Check Houston TranStar for local traffic maps and road closures.
💡 Frequently Asked Questions (FAQ)
- Q: When is the peak flood risk in Houston this Sunday?
- A: The highest flood risk occurs Sunday evening from 6 PM to midnight, when training thunderstorms may cause rapid water accumulation and potential urban flooding.
- Q: Which counties are under flood advisories for this storm?
- A: Active flood advisories are in effect for Harris, Matagorda, Wharton, and Sabinal counties.
- Q: How long will the flood risk last in Houston?
- A: The flood risk extends through midweek, with a flood watch effective through Wednesday due to saturated ground and continued Gulf moisture.
Extended Reading
According to FOX 26 Houston, the July 12 morning forecast warned of widespread tropical moisture triggering street flooding risks. Click2Houston reported flood advisories up as heavy rain hammered Houston on Sunday afternoon. KSAT confirmed Gulf moisture would fuel daily rain chances through midweek, with 14 warnings and a watch in effect for 8 regions.